468133 Extension point for pom mojo configuration content assist

Change-Id: Ifd2e3bad27314880e98998a97ed7abd26d648d30
Signed-off-by: Anton Tanasenko <atg.sleepless@gmail.com>

12 files changed, 916 insertions, 566 deletions

diff --git a/org.eclipse.m2e.editor.xml/META-INF/MANIFEST.MF b/org.eclipse.m2e.editor.xml/META-INF/MANIFEST.MF
index 1f18d4c3..b2c5d70c 100644
--- a/org.eclipse.m2e.editor.xml/META-INF/MANIFEST.MF
+++ b/org.eclipse.m2e.editor.xml/META-INF/MANIFEST.MF
@@ -27,6 +27,7 @@ Export-Package: org.eclipse.m2e.editor.xml;x-internal:=true,
  org.eclipse.m2e.editor.xml.internal;x-internal:=true,
  org.eclipse.m2e.editor.xml.internal.lifecycle;x-internal:=true,
  org.eclipse.m2e.editor.xml.internal.mojo;x-internal:=true,
+ org.eclipse.m2e.editor.xml.mojo;x-internal:=true,
  org.eclipse.m2e.editor.xml.preferences;x-internal:=true
 Bundle-ClassPath: .
 Bundle-Vendor: %Bundle-Vendor
diff --git a/org.eclipse.m2e.editor.xml/plugin.properties b/org.eclipse.m2e.editor.xml/plugin.properties
new file mode 100644
index 00000000..1a903c03
--- /dev/null
+++ b/org.eclipse.m2e.editor.xml/plugin.properties
@@ -0,0 +1 @@
+extension-point.mojoParameterMetadata.name=Mojo Parameter Metadata
diff --git a/org.eclipse.m2e.editor.xml/plugin.xml b/org.eclipse.m2e.editor.xml/plugin.xml
index 17ecab89..bb01872b 100644
--- a/org.eclipse.m2e.editor.xml/plugin.xml
+++ b/org.eclipse.m2e.editor.xml/plugin.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.2"?>
 <plugin>
+  <extension-point id="mojoParameterMetadata" name="%extension-point.mojoParameterMetadata.name" schema="schema/mojoParameterMetadata.exsd"/>
 
   <extension point="org.eclipse.wst.sse.ui.editorConfiguration">
     <sourceViewerConfiguration
diff --git a/org.eclipse.m2e.editor.xml/schema/.gitignore b/org.eclipse.m2e.editor.xml/schema/.gitignore
deleted file mode 100644
index e69de29b..00000000
--- a/org.eclipse.m2e.editor.xml/schema/.gitignore
+++ /dev/null
diff --git a/org.eclipse.m2e.editor.xml/schema/mojoParameterMetadata.exsd b/org.eclipse.m2e.editor.xml/schema/mojoParameterMetadata.exsd
new file mode 100644
index 00000000..f10eba03
--- /dev/null
+++ b/org.eclipse.m2e.editor.xml/schema/mojoParameterMetadata.exsd
@@ -0,0 +1,121 @@
+<?xml version='1.0' encoding='UTF-8'?>

+<!-- Schema file written by PDE -->

+<schema targetNamespace="org.eclipse.m2e.editor.xml" xmlns="http://www.w3.org/2001/XMLSchema">

+<annotation>

+      <appInfo>

+         <meta.schema plugin="org.eclipse.m2e.editor.xml" id="mojoParameterMetadata" name="%extension-point.mojoParameterMetadata.name"/>

+      </appInfo>

+      <documentation>

+         Mojo parameter metadata sources provide plugin configuration options that mirror the corresponding component configurator

+      </documentation>

+   </annotation>

+

+   <element name="extension">

+      <annotation>

+         <appInfo>

+            <meta.element />

+         </appInfo>

+      </annotation>

+      <complexType>

+         <sequence minOccurs="1" maxOccurs="unbounded">

+            <element ref="mojoParameterMetadata"/>

+         </sequence>

+         <attribute name="point" type="string" use="required">

+            <annotation>

+               <documentation>

+                  

+               </documentation>

+            </annotation>

+         </attribute>

+         <attribute name="id" type="string">

+            <annotation>

+               <documentation>

+                  

+               </documentation>

+            </annotation>

+         </attribute>

+         <attribute name="name" type="string">

+            <annotation>

+               <documentation>

+                  

+               </documentation>

+               <appInfo>

+                  <meta.attribute translatable="true"/>

+               </appInfo>

+            </annotation>

+         </attribute>

+      </complexType>

+   </element>

+

+   <element name="mojoParameterMetadata">

+      <complexType>

+         <attribute name="configurator" type="string" use="required">

+            <annotation>

+               <documentation>

+                  

+               </documentation>

+            </annotation>

+         </attribute>

+         <attribute name="class" type="string" use="required">

+            <annotation>

+               <documentation>

+                  

+               </documentation>

+               <appInfo>

+                  <meta.attribute kind="java" basedOn=":org.eclipse.m2e.editor.xml.mojo.IMojoParameterMetadata"/>

+               </appInfo>

+            </annotation>

+         </attribute>

+      </complexType>

+   </element>

+

+   <annotation>

+      <appInfo>

+         <meta.section type="since"/>

+      </appInfo>

+      <documentation>

+         1.6

+      </documentation>

+   </annotation>

+

+   <annotation>

+      <appInfo>

+         <meta.section type="examples"/>

+      </appInfo>

+      <documentation>

+         [Enter extension point usage example here.]

+      </documentation>

+   </annotation>

+

+   <annotation>

+      <appInfo>

+         <meta.section type="apiinfo"/>

+      </appInfo>

+      <documentation>

+         [Enter API information here.]

+      </documentation>

+   </annotation>

+

+   <annotation>

+      <appInfo>

+         <meta.section type="implementation"/>

+      </appInfo>

+      <documentation>

+         [Enter information about supplied implementation of this extension point.]

+      </documentation>

+   </annotation>

+

+   <annotation>

+      <appInfo>

+         <meta.section type="copyright"/>

+      </appInfo>

+      <documentation>

+         Copyright (c) 2015 Takari, Inc.

+All rights reserved. This program and the accompanying materials

+are made available under the terms of the Eclipse Public License v1.0

+which accompanies this distribution, and is available at

+http://www.eclipse.org/legal/epl-v10.html

+      </documentation>

+   </annotation>

+

+</schema>

diff --git a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/PomTemplateContext.java b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/PomTemplateContext.java
index 891bb878..14ff2315 100644
--- a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/PomTemplateContext.java
+++ b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/PomTemplateContext.java
@@ -54,14 +54,16 @@ import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
 
+import org.eclipse.m2e.core.embedder.ArtifactKey;
 import org.eclipse.m2e.core.ui.internal.M2EUIPluginActivator;
 import org.eclipse.m2e.core.ui.internal.search.util.ArtifactInfo;
 import org.eclipse.m2e.core.ui.internal.search.util.Packaging;
 import org.eclipse.m2e.core.ui.internal.search.util.SearchEngine;
 import org.eclipse.m2e.editor.xml.internal.Messages;
 import org.eclipse.m2e.editor.xml.internal.XmlUtils;
-import org.eclipse.m2e.editor.xml.internal.mojo.MojoParameter;
 import org.eclipse.m2e.editor.xml.internal.mojo.MojoParameterMetadataProvider;
+import org.eclipse.m2e.editor.xml.mojo.IMojoParameterMetadataProvider;
+import org.eclipse.m2e.editor.xml.mojo.MojoParameter;
 
 
 /**
@@ -115,8 +117,8 @@ public enum PomTemplateContext {
     }
 
     @Override
-    protected void addTemplates(MavenProject project, IProject eclipseprj, Collection<Template> proposals, Node node,
-        String prefix) throws CoreException {
+    protected void addTemplates(final MavenProject project, IProject eclipseprj, Collection<Template> proposals,
+        Node node, String prefix) throws CoreException {
       // find configuration ancestor
 
       List<String> pathElements = new ArrayList<String>();
@@ -181,16 +183,12 @@ public enum PomTemplateContext {
         }
       }
 
-      Plugin plugin = new Plugin();
-      plugin.setGroupId(groupId);
-      plugin.setArtifactId(artifactId);
-      plugin.setVersion(version);
-
+      final ArtifactKey pluginKey = new ArtifactKey(groupId, artifactId, version, null);
       final String fConfigImpl = configImpl;
       final MojoParameter[] parameterMetadata = new MojoParameter[1];
       final CoreException[] innerException = new CoreException[1];
 
-      final MojoParameterMetadataProvider prov = new MojoParameterMetadataProvider(project, plugin);
+      final IMojoParameterMetadataProvider prov = new MojoParameterMetadataProvider();
       try {
         PlatformUI.getWorkbench().getActiveWorkbenchWindow().run(true, true, new IRunnableWithProgress() {
           public void run(IProgressMonitor monitor) {
@@ -198,11 +196,11 @@ public enum PomTemplateContext {
             try {
               MojoParameter parameter;
               if(fConfigImpl != null) {
-                parameter = prov.getParameterRoot(fConfigImpl, monitor);
+                parameter = prov.getClassConfiguration(pluginKey, fConfigImpl, monitor);
               } else if(usedMojos.isEmpty()) {
-                parameter = prov.getMojoParameterRoot(monitor);
+                parameter = prov.getMojoConfiguration(pluginKey, monitor);
               } else {
-                parameter = prov.getMojoParameterRoot(usedMojos, monitor);
+                parameter = prov.getMojoConfiguration(pluginKey, usedMojos, monitor);
               }
 
               if(monitor.isCanceled())
diff --git a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/DefaultMojoParameterMetadata.java b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/DefaultMojoParameterMetadata.java
new file mode 100644
index 00000000..fb229b37
--- /dev/null
+++ b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/DefaultMojoParameterMetadata.java
@@ -0,0 +1,87 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Takari, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *      Anton Tanasenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.editor.xml.internal.mojo;
+
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.apache.maven.plugin.descriptor.Parameter;
+import org.apache.maven.plugin.descriptor.PluginDescriptor;
+
+import org.eclipse.m2e.editor.xml.mojo.IMojoParameterMetadata;
+import org.eclipse.m2e.editor.xml.mojo.MojoParameter;
+import org.eclipse.m2e.editor.xml.mojo.PlexusConfigHelper;
+
+
+/**
+ * DefaultMojoParameterMetadataSource
+ *
+ * @author sleepless
+ */
+public class DefaultMojoParameterMetadata implements IMojoParameterMetadata {
+  private final Logger log = LoggerFactory.getLogger(getClass());
+
+  public List<MojoParameter> loadMojoParameters(PluginDescriptor desc, MojoDescriptor mojo, PlexusConfigHelper helper,
+      IProgressMonitor monitor) throws CoreException {
+
+    if(monitor.isCanceled()) {
+      return Collections.emptyList();
+    }
+    Class<?> clazz;
+    try {
+      clazz = mojo.getImplementationClass();
+      if(clazz == null) {
+        clazz = desc.getClassRealm().loadClass(mojo.getImplementation());
+      }
+    } catch(ClassNotFoundException | TypeNotPresentException ex) {
+      log.warn(ex.getMessage());
+      return Collections.emptyList();
+    }
+
+    List<Parameter> ps = mojo.getParameters();
+    Map<String, Type> properties = helper.getClassProperties(clazz);
+
+    List<MojoParameter> parameters = new ArrayList<>();
+
+    if(ps != null) {
+      for(Parameter p : ps) {
+        if(monitor.isCanceled()) {
+          return Collections.emptyList();
+        }
+        if(!p.isEditable()) {
+          continue;
+        }
+
+        Type type = properties.get(p.getName());
+        if(type == null) {
+          continue;
+        }
+
+        helper.addParameter(desc.getClassRealm(), clazz, type, p.getName(), p.getAlias(), parameters, p.isRequired(),
+            p.getExpression(), p.getDescription(), p.getDefaultValue(), monitor);
+      }
+    }
+
+    return parameters;
+  }
+
+}
diff --git a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/MojoParameterMetadataProvider.java b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/MojoParameterMetadataProvider.java
index 07f6b4a4..d3a6b7b1 100644
--- a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/MojoParameterMetadataProvider.java
+++ b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/MojoParameterMetadataProvider.java
@@ -11,39 +11,33 @@
 
 package org.eclipse.m2e.editor.xml.internal.mojo;
 
-import java.io.File;
-import java.io.IOException;
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
-import java.lang.reflect.ParameterizedType;
-import java.lang.reflect.Type;
-import java.net.URI;
-import java.net.URL;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.Date;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Properties;
 import java.util.Set;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
 import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.ImmutableSet;
-import com.google.common.reflect.ClassPath;
-import com.google.common.reflect.ClassPath.ClassInfo;
 
 import org.eclipse.aether.repository.RemoteRepository;
 import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtension;
+import org.eclipse.core.runtime.IExtensionPoint;
+import org.eclipse.core.runtime.IExtensionRegistry;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
 
 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
@@ -55,96 +49,91 @@ import org.apache.maven.model.building.UrlModelSource;
 import org.apache.maven.plugin.BuildPluginManager;
 import org.apache.maven.plugin.MavenPluginManager;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
-import org.apache.maven.plugin.descriptor.Parameter;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.apache.maven.project.MavenProject;
 import org.apache.maven.project.ProjectBuilder;
 import org.apache.maven.project.ProjectBuildingException;
 
 import org.eclipse.m2e.core.MavenPlugin;
+import org.eclipse.m2e.core.embedder.ArtifactKey;
 import org.eclipse.m2e.core.embedder.ICallable;
 import org.eclipse.m2e.core.embedder.IMavenExecutionContext;
 import org.eclipse.m2e.core.internal.IMavenConstants;
 import org.eclipse.m2e.core.internal.Messages;
 import org.eclipse.m2e.core.internal.embedder.MavenExecutionContext;
 import org.eclipse.m2e.core.internal.embedder.MavenImpl;
+import org.eclipse.m2e.editor.xml.MvnIndexPlugin;
+import org.eclipse.m2e.editor.xml.mojo.IMojoParameterMetadata;
+import org.eclipse.m2e.editor.xml.mojo.IMojoParameterMetadataProvider;
+import org.eclipse.m2e.editor.xml.mojo.MojoParameter;
+import org.eclipse.m2e.editor.xml.mojo.PlexusConfigHelper;
 
 
 /**
  * @author atanasenko
  */
 @SuppressWarnings("restriction")
-public class MojoParameterMetadataProvider {
+public class MojoParameterMetadataProvider implements IMojoParameterMetadataProvider {
 
   private static final Logger log = LoggerFactory.getLogger(MojoParameterMetadataProvider.class);
 
-  private final MavenProject project;
-
-  private final Plugin plugin;
+  private static final Cache<String, MojoParameter> cache = CacheBuilder.newBuilder().maximumSize(100).softValues()
+      .build();
 
   protected final MavenImpl maven;
 
-  private final Map<String, List<MojoParameter>> parameters;
-
-  public MojoParameterMetadataProvider(MavenProject project, Plugin plugin) {
-    this.project = project;
-    this.plugin = plugin;
+  public MojoParameterMetadataProvider() {
     maven = (MavenImpl) MavenPlugin.getMaven();
-    parameters = new HashMap<>();
   }
 
-  public MojoParameter getParameterRoot(final String className, IProgressMonitor monitor) throws CoreException {
-
-    List<MojoParameter> plist = parameters.get(className);
-    if(plist == null) {
-      plist = new ArrayList<>();
-      this.parameters.put(className, plist);
-      final List<MojoParameter> parameters = plist;
-
-      execute(new ICallable<Void>() {
-        public Void call(IMavenExecutionContext context, IProgressMonitor monitor) throws CoreException {
-          PluginDescriptor pd = getPluginDescriptor(context, monitor);
+  public MojoParameter getClassConfiguration(final ArtifactKey pluginKey, final String className,
+      final IProgressMonitor monitor) throws CoreException {
 
-          if(pd != null) {
-            Class<?> clazz;
-            try {
-              clazz = pd.getClassRealm().loadClass(className);
-            } catch(ClassNotFoundException ex) {
+    try {
+      String key = pluginKey.toPortableString() + "/" + className;
+
+      return cache.get(key, new Callable<MojoParameter>() {
+        public MojoParameter call() throws Exception {
+
+          return execute(pluginKey, new ICallable<MojoParameter>() {
+            public MojoParameter call(IMavenExecutionContext context, IProgressMonitor monitor) throws CoreException {
+              PluginDescriptor pd = getPluginDescriptor(pluginKey, context, monitor);
+
+              if(pd != null) {
+                Class<?> clazz;
+                try {
+                  clazz = pd.getClassRealm().loadClass(className);
+                } catch(ClassNotFoundException ex) {
+                  return null;
+                }
+
+                return new MojoParameter("", className, //$NON-NLS-1$
+                    new PlexusConfigHelper().loadParameters(pd.getClassRealm(), clazz, monitor));
+              }
               return null;
             }
-
-            loadParameters(pd, clazz, parameters, monitor);
-          }
-          return null;
+          }, monitor);
         }
-      }, monitor);
-    }
-
-    return new MojoParameter("", className, plist); //$NON-NLS-1$
-  }
-
-  protected List<MojoParameter> getParameters(PluginDescriptor desc, final Class<?> clazz, IProgressMonitor monitor)
-      throws CoreException {
-
-    String key = clazz.getName();
-    List<MojoParameter> plist = parameters.get(key);
+      });
 
-    if(plist == null) {
-      plist = new ArrayList<>();
-      this.parameters.put(key, plist);
-
-      loadParameters(desc, clazz, plist, monitor);
+    } catch(ExecutionException e) {
+      Throwable t = e.getCause();
+      if(t instanceof CoreException) {
+        throw (CoreException) t;
+      }
+      if(t instanceof RuntimeException) {
+        throw (RuntimeException) t;
+      }
+      throw new CoreException(new Status(IStatus.ERROR, IMavenConstants.PLUGIN_ID, -1, e.getMessage(), e));
     }
-
-    return plist;
   }
 
-  public MojoParameter getMojoParameterRoot(final Collection<String> mojos, IProgressMonitor monitor)
-      throws CoreException {
+  public MojoParameter getMojoConfiguration(ArtifactKey pluginKey, final Collection<String> mojos,
+      IProgressMonitor monitor) throws CoreException {
     List<MojoParameter> params = new ArrayList<>();
     Set<String> collected = new HashSet<>();
     for(String mojo : mojos) {
-      MojoParameter md = getMojoParameterRoot(mojo, monitor);
+      MojoParameter md = getMojoConfiguration(pluginKey, mojo, monitor);
       for(MojoParameter p : md.getNestedParameters()) {
         if(!collected.add(p.getName()))
           continue;
@@ -154,50 +143,78 @@ public class MojoParameterMetadataProvider {
     return new MojoParameter("", "", params); //$NON-NLS-1$ //$NON-NLS-2$
   }
 
-  public MojoParameter getMojoParameterRoot(IProgressMonitor monitor) throws CoreException {
-    return getMojoParameterRoot("*", monitor); //$NON-NLS-1$
+  public MojoParameter getMojoConfiguration(ArtifactKey pluginKey, IProgressMonitor monitor) throws CoreException {
+    return getMojoConfiguration(pluginKey, "*", monitor); //$NON-NLS-1$
   }
 
-  public MojoParameter getMojoParameterRoot(final String mojo, IProgressMonitor monitor) throws CoreException {
+  public MojoParameter getMojoConfiguration(final ArtifactKey pluginKey, final String mojo,
+      final IProgressMonitor monitor) throws CoreException {
 
-    MojoParameter predefParameters = getPredefined();
+    MojoParameter predefParameters = getPredefined(pluginKey);
     if(predefParameters != null) {
       return predefParameters;
     }
 
-    String key = "mojo:" + (mojo == null ? "*" : mojo); //$NON-NLS-1$ //$NON-NLS-2$
+    String key = pluginKey.toPortableString() + "/mojo/" + (mojo == null ? "*" : mojo); //$NON-NLS-1$ //$NON-NLS-2$
 
-    List<MojoParameter> plist = parameters.get(key);
+    try {
+      return cache.get(key, new Callable<MojoParameter>() {
+        public MojoParameter call() throws Exception {
+
+          return execute(pluginKey, new ICallable<MojoParameter>() {
+            public MojoParameter call(IMavenExecutionContext context, IProgressMonitor monitor) throws CoreException {
+              PluginDescriptor pd = getPluginDescriptor(pluginKey, context, monitor);
+              if(pd != null) {
+                return new MojoParameter("", mojo, loadMojoParameters(pd, mojo, monitor)); //$NON-NLS-1$
+              }
+              return null;
+            }
+          }, monitor);
+        }
+      });
 
-    if(plist == null) {
+    } catch(ExecutionException e) {
+      Throwable t = e.getCause();
+      if(t instanceof CoreException) {
+        throw (CoreException) t;
+      }
+      if(t instanceof RuntimeException) {
+        throw (RuntimeException) t;
+      }
+      throw new CoreException(new Status(IStatus.ERROR, IMavenConstants.PLUGIN_ID, -1, e.getMessage(), e));
+    }
+  }
+
+  List<MojoParameter> loadMojoParameters(PluginDescriptor desc, String goal, IProgressMonitor monitor)
+      throws CoreException {
 
-      final List<MojoParameter> parameters = new ArrayList<>();
-      plist = parameters;
-      this.parameters.put(key, plist);
+    PlexusConfigHelper helper = new PlexusConfigHelper();
 
-      execute(new ICallable<Void>() {
-        public Void call(IMavenExecutionContext context, IProgressMonitor monitor) throws CoreException {
-          PluginDescriptor pd = getPluginDescriptor(context, monitor);
-          if(pd != null) {
-            loadMojoParameters(pd, mojo, parameters, monitor);
+    if(goal.equals("*")) { //$NON-NLS-1$
+      List<MojoParameter> parameters = new ArrayList<>();
+      Set<String> collected = new HashSet<>();
+      for(MojoDescriptor mojo : desc.getMojos()) {
+        for(MojoParameter p : loadMojoParameters(desc, mojo, helper, monitor)) {
+          if(collected.add(p.getName())) {
+            parameters.add(p);
           }
-          return null;
         }
-      }, monitor);
+      }
+      return parameters;
     }
-
-    return new MojoParameter("", mojo, plist); //$NON-NLS-1$
+    return loadMojoParameters(desc, desc.getMojo(goal), helper, monitor);
   }
 
-  private MojoParameter getPredefined() {
-    return PREDEF.get(plugin.getGroupId() + ":" + plugin.getArtifactId() + ":" + plugin.getVersion());
+  private MojoParameter getPredefined(ArtifactKey pluginKey) {
+    return PREDEF.get(pluginKey.getGroupId() + ":" + pluginKey.getArtifactId() + ":" + pluginKey.getVersion());
   }
 
-  private void execute(final ICallable<Void> callable, IProgressMonitor monitor) throws CoreException {
+  <T> T execute(final ArtifactKey pluginKey, final ICallable<T> callable, IProgressMonitor monitor)
+      throws CoreException {
     MavenExecutionContext context = maven.createExecutionContext();
     context.getExecutionRequest().setCacheTransferError(false);
-    context.execute(new ICallable<Void>() {
-      public Void call(IMavenExecutionContext context, IProgressMonitor monitor) throws CoreException {
+    return context.execute(new ICallable<T>() {
+      public T call(IMavenExecutionContext context, IProgressMonitor monitor) throws CoreException {
         MavenProject mp = getProject(context);
         if(mp != null) {
           return context.execute(mp, callable, monitor);
@@ -207,84 +224,7 @@ public class MojoParameterMetadataProvider {
     }, monitor);
   }
 
-  void loadMojoParameters(PluginDescriptor desc, String goal, List<MojoParameter> parameters, IProgressMonitor monitor)
-      throws CoreException {
-
-    Set<String> collected = new HashSet<>();
-
-    if(goal.equals("*")) { //$NON-NLS-1$
-      for(MojoDescriptor mojo : desc.getMojos()) {
-        loadMojoParameters(desc, mojo, parameters, collected, monitor);
-      }
-      return;
-    }
-
-    MojoDescriptor mojo = desc.getMojo(goal);
-    loadMojoParameters(desc, mojo, parameters, collected, monitor);
-  }
-
-  protected void loadMojoParameters(PluginDescriptor desc, MojoDescriptor mojo, List<MojoParameter> parameters,
-      Set<String> collected, IProgressMonitor monitor) throws CoreException {
-
-    if(monitor.isCanceled()) {
-      return;
-    }
-    Class<?> clazz;
-    try {
-      clazz = mojo.getImplementationClass();
-      if(clazz == null) {
-        clazz = desc.getClassRealm().loadClass(mojo.getImplementation());
-      }
-    } catch(ClassNotFoundException | TypeNotPresentException ex) {
-      log.warn(ex.getMessage());
-      return;
-    }
-
-    List<Parameter> ps = mojo.getParameters();
-    Map<String, Type> properties = getClassProperties(clazz);
-
-    if(ps != null) {
-      for(Parameter p : ps) {
-        if(monitor.isCanceled()) {
-          return;
-        }
-        if(!p.isEditable()) {
-          continue;
-        }
-
-        Type type = properties.get(p.getName());
-        if(type == null) {
-          continue;
-        }
-
-        if(collected.add(p.getName())) {
-          addParameter(desc, clazz, type, p.getName(), p.getAlias(), parameters, p.isRequired(), p.getExpression(),
-              p.getDescription(), p.getDefaultValue(), monitor);
-        }
-      }
-    }
-  }
-
-  protected void loadParameters(PluginDescriptor desc, Class<?> clazz, List<MojoParameter> parameters,
-      IProgressMonitor monitor) throws CoreException {
-    if(monitor.isCanceled()) {
-      return;
-    }
-
-    Map<String, Type> properties = getClassProperties(clazz);
-
-    for(Map.Entry<String, Type> e : properties.entrySet()) {
-      if(monitor.isCanceled()) {
-        return;
-      }
-      addParameter(desc, clazz, e.getValue(), e.getKey(), null, parameters, false, null, null, null, monitor);
-    }
-  }
-
-  protected MavenProject getProject(IMavenExecutionContext context) {
-    if(project != null) {
-      return project;
-    }
+  MavenProject getProject(IMavenExecutionContext context) {
 
     ModelSource modelSource = new UrlModelSource(DefaultMaven.class.getResource("project/standalone.xml")); //$NON-NLS-1$
     try {
@@ -295,9 +235,15 @@ public class MojoParameterMetadataProvider {
     }
   }
 
-  PluginDescriptor getPluginDescriptor(IMavenExecutionContext context, IProgressMonitor monitor) {
+  PluginDescriptor getPluginDescriptor(ArtifactKey pluginKey, IMavenExecutionContext context,
+      IProgressMonitor monitor) {
     PluginDescriptor desc;
 
+    Plugin plugin = new Plugin();
+    plugin.setGroupId(pluginKey.getGroupId());
+    plugin.setArtifactId(pluginKey.getArtifactId());
+    plugin.setVersion(pluginKey.getVersion());
+
     List<RemoteRepository> remoteRepos = context.getSession().getCurrentProject().getRemotePluginRepositories();
     try {
       desc = lookup(MavenPluginManager.class).getPluginDescriptor(plugin, remoteRepos, context.getRepositorySession());
@@ -314,403 +260,55 @@ public class MojoParameterMetadataProvider {
     try {
       return maven.getPlexusContainer().lookup(clazz);
     } catch(ComponentLookupException ex) {
-      throw new CoreException(new Status(IStatus.ERROR, IMavenConstants.PLUGIN_ID, -1, Messages.MavenImpl_error_lookup,
-          ex));
+      throw new CoreException(
+          new Status(IStatus.ERROR, IMavenConstants.PLUGIN_ID, -1, Messages.MavenImpl_error_lookup, ex));
     }
   }
 
-  private void addParameter(PluginDescriptor desc, Class<?> enclosingClass, Type paramType, String name, String alias,
-      List<MojoParameter> parameters, boolean required, String expression, String description, String defaultValue,
+  List<MojoParameter> loadMojoParameters(PluginDescriptor desc, MojoDescriptor mojo, PlexusConfigHelper helper,
       IProgressMonitor monitor) throws CoreException {
 
-    Class<?> paramClass = getRawType(paramType);
-    if(paramClass == null) {
-      return;
+    IMojoParameterMetadata metadata = null;
+    String mojoConfigurator = mojo.getComponentConfigurator();
+    if(mojoConfigurator != null) {
+      metadata = readMojoParameterMetadata(mojoConfigurator);
     }
-
-    // inline
-    if(isInline(paramClass)) {
-      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType)), required, expression,
-          description, defaultValue));
-      if(alias != null) {
-        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType)), required, expression,
-            description, defaultValue));
-      }
-      return;
-    }
-
-    // map
-    if(Map.class.isAssignableFrom(paramClass)) {
-      // we can't do anything with maps, unfortunately
-      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType)).map(), required, expression,
-          description, defaultValue));
-      if(alias != null) {
-        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType)).map(), required, expression,
-            description, defaultValue));
-      }
-      return;
-    }
-
-    // properties
-    if(Properties.class.isAssignableFrom(paramClass)) {
-
-      MojoParameter inner = new MojoParameter("property", "property", Arrays.asList(
-          new MojoParameter("name", "String"), new MojoParameter("value", "String")));
-
-      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType), inner), required, expression,
-          description, defaultValue));
-      if(alias != null) {
-        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType), inner), required, expression,
-            description, defaultValue));
-      }
-    }
-
-    // collection/array
-    Type itemType = getItemType(paramType);
-
-    if(itemType != null) {
-
-      List<MojoParameter> itemParameters = getItemParameters(desc, enclosingClass, name, itemType, monitor);
-
-      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType), itemParameters), required,
-          expression, description, defaultValue));
-
-      if(alias != null) {
-        itemParameters = getItemParameters(desc, enclosingClass, alias, itemType, monitor);
-        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType), itemParameters), required,
-            expression, description, defaultValue));
-      }
-
-      return;
-    }
-
-    // pojo
-    // skip classes without no-arg constructors
-    try {
-      paramClass.getConstructor(new Class[0]);
-    } catch(NoSuchMethodException ex) {
-      return;
-    }
-
-    List<MojoParameter> params = getParameters(desc, paramClass, monitor);
-    parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType), params), required, expression,
-        description, defaultValue));
-    if(alias != null) {
-      parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType), params), required, expression,
-          description, defaultValue));
+    if(metadata == null) {
+      metadata = new DefaultMojoParameterMetadata();
     }
 
+    return metadata.loadMojoParameters(desc, mojo, helper, monitor);
   }
 
-  private List<MojoParameter> getItemParameters(PluginDescriptor desc, Class<?> enclosingClass, String name,
-      Type paramType, IProgressMonitor monitor) throws CoreException {
-
-    Class<?> paramClass = getRawType(paramType);
+  public static final String EXTENSION_MOJO_PARAMETER_METADATA = MvnIndexPlugin.PLUGIN_ID + ".mojoParameterMetadata"; //$NON-NLS-1$
 
-    if(paramClass == null || isInline(paramClass)) {
-      MojoParameter container = new MojoParameter(toSingular(name), getTypeDisplayName(paramType)).multiple();
-      return Collections.singletonList(container);
-    }
-
-    if(Map.class.isAssignableFrom(paramClass) || Properties.class.isAssignableFrom(paramClass)) {
-      MojoParameter container = new MojoParameter(toSingular(name), getTypeDisplayName(paramType)).multiple().map();
-      return Collections.singletonList(container);
-    }
-
-    Type itemType = getItemType(paramType);
-
-    if(itemType != null) {
-      MojoParameter container = new MojoParameter(toSingular(name), getTypeDisplayName(paramType)).multiple();
-      container.setNestedParameters(getItemParameters(desc, enclosingClass, name, itemType, monitor));
-      return Collections.singletonList(container);
-    }
+  private static IMojoParameterMetadata readMojoParameterMetadata(String mojoConfigurator) {
 
-    @SuppressWarnings("rawtypes")
-    List<Class> parameterClasses = getCandidateClasses(desc, enclosingClass, paramClass);
-
-    List<MojoParameter> parameters = new ArrayList<>();
-    for(Class<?> clazz : parameterClasses) {
-
-      String paramName;
-      if(clazz.equals(paramClass)) {
-        paramName = toSingular(name);
-      } else {
-        paramName = clazz.getSimpleName();
-        paramName = Character.toLowerCase(paramName.charAt(0)) + paramName.substring(1);
-      }
-
-      MojoParameter container = new MojoParameter(paramName, getTypeDisplayName(clazz)).multiple();
-      container.setNestedParameters(getParameters(desc, clazz, monitor));
-      parameters.add(container);
-    }
-
-    return parameters;
-  }
-
-  private static MojoParameter configure(MojoParameter p, boolean required, String expression, String description,
-      String defaultValue) {
-    p.setRequired(required);
-    p.setExpression(expression);
-    p.setDescription(description);
-    p.setDefaultValue(defaultValue);
-    return p;
-  }
-
-  private static Class<?> getRawType(Type type) {
-    if(type instanceof Class) {
-      return (Class<?>) type;
-    }
-    if(type instanceof ParameterizedType) {
-      return (Class<?>) ((ParameterizedType) type).getRawType();
-    }
-    return null;
-  }
-
-  private static Type getItemType(Type paramType) {
-
-    Class<?> paramClass = getRawType(paramType);
-
-    if(paramClass != null && paramClass.isArray()) {
-      return paramClass.getComponentType();
-    }
-    if(!Collection.class.isAssignableFrom(paramClass)) {
-      return null;
-    }
-
-    if(paramType instanceof ParameterizedType) {
-      ParameterizedType pt = (ParameterizedType) paramType;
-
-      Type[] args = pt.getActualTypeArguments();
-      if(args.length > 0) {
-        return args[0];
-      }
-    }
-
-    return null;
-  }
-
-  private static Map<String, Type> getClassProperties(Class<?> clazz) {
-    Map<String, Type> props = new HashMap<>();
-
-    Method[] methods;
-    try {
-      methods = clazz.getMethods();
-    } catch(Throwable e) {
-      log.debug("Cannot get methods of " + clazz.getName(), e);
-      methods = null;
-    }
-
-    if(methods != null) {
-      for(Method m : methods) {
-        if((m.getModifiers() & Modifier.STATIC) != 0) {
-          continue;
-        }
-
-        String name = m.getName();
-
-        if((name.startsWith("add") || name.startsWith("set")) && m.getParameterTypes().length == 1) { //$NON-NLS-1$ //$NON-NLS-2$
-          String prop = name.substring(3);
-          if(!prop.isEmpty()) {
-            prop = Character.toLowerCase(prop.charAt(0)) + prop.substring(1);
-            if(!props.containsKey(prop)) {
-              props.put(prop, m.getGenericParameterTypes()[0]);
+    IExtensionRegistry registry = Platform.getExtensionRegistry();
+    IExtensionPoint mappingsExtensionPoint = registry.getExtensionPoint(EXTENSION_MOJO_PARAMETER_METADATA);
+    if(mappingsExtensionPoint != null) {
+      IExtension[] mappingsExtensions = mappingsExtensionPoint.getExtensions();
+      for(IExtension extension : mappingsExtensions) {
+        IConfigurationElement[] elements = extension.getConfigurationElements();
+        for(IConfigurationElement element : elements) {
+          if(element.getName().equals("mojoParameterMetadata") //$NON-NLS-1$
+              && mojoConfigurator.equals(element.getAttribute("configurator"))) { //$NON-NLS-1$
+            try {
+              return (IMojoParameterMetadata) element.createExecutableExtension("class"); //$NON-NLS-1$
+            } catch(CoreException ex) {
+              log.error(ex.getMessage(), ex);
             }
           }
         }
       }
     }
-
-    Class<?> pClazz = clazz;
-    while(pClazz != null && !pClazz.equals(Object.class)) {
-
-      Field[] fields;
-      try {
-        fields = pClazz.getDeclaredFields();
-      } catch(Throwable e) {
-        log.debug("Cannot get declared fields of " + pClazz.getName(), e);
-        fields = null;
-      }
-
-      if(fields != null) {
-        for(Field f : fields) {
-          if((f.getModifiers() & (Modifier.STATIC | Modifier.FINAL)) != 0) {
-            continue;
-          }
-
-          String prop = f.getName();
-
-          if(!props.containsKey(prop)) {
-
-            props.put(prop, f.getGenericType());
-
-          }
-        }
-      }
-      pClazz = pClazz.getSuperclass();
-
-    }
-
-    return props;
-  }
-
-  @SuppressWarnings({"rawtypes", "unchecked"})
-  private static List<Class> getCandidateClasses(PluginDescriptor desc, Class enclosingClass, Class paramClass) {
-
-    String name = enclosingClass.getName();
-    int dot = name.lastIndexOf('.');
-    if(dot > 0) {
-      String pkg = name.substring(0, dot);
-
-      List<Class> candidateClasses = null;
-
-      ClassPath cp;
-      try {
-        cp = ClassPath.from(desc.getClassRealm());
-      } catch(IOException e) {
-        log.error(e.getMessage());
-        return Collections.singletonList(enclosingClass);
-      }
-
-      for(ClassInfo ci : cp.getTopLevelClasses(pkg)) {
-        Class clazz;
-        try {
-          clazz = desc.getClassRealm().loadClass(ci.getName());
-        } catch(ClassNotFoundException e) {
-          log.error(e.getMessage(), e);
-          continue;
-        }
-
-        if((clazz.getModifiers() & (Modifier.ABSTRACT)) != 0) {
-          continue;
-        }
-
-        if(!paramClass.isAssignableFrom(clazz)) {
-          continue;
-        }
-
-        // skip classes without no-arg constructors
-        try {
-          clazz.getConstructor(new Class[0]);
-        } catch(NoSuchMethodException ex) {
-          continue;
-        }
-
-        if(candidateClasses == null) {
-          candidateClasses = new ArrayList<Class>();
-        }
-        candidateClasses.add(clazz);
-
-      }
-
-      if(candidateClasses != null) {
-        return candidateClasses;
-      }
-    }
-
-    return Collections.singletonList(paramClass);
-  }
-
-  private static boolean isInline(Class<?> paramClass) {
-    return INLINE_TYPES.contains(paramClass.getName()) || paramClass.isEnum();
-  }
-
-  private static String getTypeDisplayName(Type type) {
-    Class<?> clazz = getRawType(type);
-
-    if(clazz == null) {
-      return type.toString();
-    }
-
-    if(clazz.isArray()) {
-      return getTypeDisplayName(clazz.getComponentType()) + "[]"; //$NON-NLS-1$
-    }
-
-    if(type instanceof ParameterizedType) {
-      ParameterizedType ptype = (ParameterizedType) type;
-      StringBuilder sb = new StringBuilder();
-      sb.append(getTypeDisplayName(clazz)).append("&lt;"); //$NON-NLS-1$
-
-      boolean first = true;
-      for(Type arg : ptype.getActualTypeArguments()) {
-        if(first)
-          first = false;
-        else
-          sb.append(", "); //$NON-NLS-1$
-        sb.append(getTypeDisplayName(arg));
-      }
-
-      return sb.append("&gt;").toString(); //$NON-NLS-1$
-    }
-
-    String name = clazz.getName();
-    int idx = name.lastIndexOf('.');
-    if(idx == -1) {
-      return name;
-    }
-    // remove common package names
-    String pkg = name.substring(0, idx);
-    if(pkg.equals("java.lang") || pkg.equals("java.util") || pkg.equals("java.io")) { //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
-      return clazz.getSimpleName();
-    }
-    return name;
-  }
-
-  private static String toSingular(String name) {
-    if(name == null || name.trim().isEmpty()) {
-      return name;
-    }
-    if(name.endsWith("ies")) { //$NON-NLS-1$
-      return name.substring(0, name.length() - 3) + "y"; //$NON-NLS-1$
-    } else if(name.endsWith("ches")) { //$NON-NLS-1$ $NON-NLS-2$
-      return name.substring(0, name.length() - 2);
-    } else if(name.endsWith("xes")) { //$NON-NLS-1$
-      return name.substring(0, name.length() - 2);
-    } else if(name.endsWith("s") && (name.length() != 1)) { //$NON-NLS-1$
-      return name.substring(0, name.length() - 1);
-    }
-    return name;
+    return null;
   }
 
-  private static final Set<String> INLINE_TYPES;
-
   private static final Map<String, MojoParameter> PREDEF;
 
   static {
     // @formatter:off
-    INLINE_TYPES = ImmutableSet.<String>of(
-      byte.class.getName(),
-      Byte.class.getName(),
-      short.class.getName(),
-      Short.class.getName(),
-      int.class.getName(),
-      Integer.class.getName(),
-      long.class.getName(),
-      Long.class.getName(),
-      float.class.getName(),
-      Float.class.getName(),
-      double.class.getName(),
-      Double.class.getName(),
-      boolean.class.getName(),
-      Boolean.class.getName(),
-      char.class.getName(),
-      Character.class.getName(),
-  
-      String.class.getName(),
-      StringBuilder.class.getName(),
-      StringBuffer.class.getName(),
-  
-      File.class.getName(),
-      URI.class.getName(),
-      URL.class.getName(),
-      Date.class.getName(),
-  
-      "org.codehaus.plexus.configuration.PlexusConfiguration"
-    );
-    // @formatter:on
-  }
-
-  static {
-    // @formatter:off
     PREDEF = ImmutableMap.<String, MojoParameter>of(
       "org.eclipse.m2e:lifecycle-mapping:1.0.0",
       new MojoParameter("", "", Collections.singletonList(
diff --git a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/IMojoParameterMetadata.java b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/IMojoParameterMetadata.java
new file mode 100644
index 00000000..7e8b7c3b
--- /dev/null
+++ b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/IMojoParameterMetadata.java
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Takari, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *      Anton Tanasenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.editor.xml.mojo;
+
+import java.util.List;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.apache.maven.plugin.descriptor.PluginDescriptor;
+
+
+/**
+ * @since 1.6
+ */
+public interface IMojoParameterMetadata {
+
+  /**
+   * Returns a list of parameters that are applicable to a specified plugin mojo
+   */
+  List<MojoParameter> loadMojoParameters(PluginDescriptor desc, MojoDescriptor mojo, PlexusConfigHelper helper,
+      IProgressMonitor monitor) throws CoreException;
+
+}
diff --git a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/IMojoParameterMetadataProvider.java b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/IMojoParameterMetadataProvider.java
new file mode 100644
index 00000000..5ee6f609
--- /dev/null
+++ b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/IMojoParameterMetadataProvider.java
@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Takari, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *      Anton Tanasenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.editor.xml.mojo;
+
+import java.util.Collection;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+
+import org.eclipse.m2e.core.embedder.ArtifactKey;
+
+
+/**
+ * Provides available configuration options for maven plugin executions
+ *
+ * @author atanasenko
+ * @since 1.6
+ */
+public interface IMojoParameterMetadataProvider {
+
+  /**
+   * Calculates available configuration of one specific mojo.
+   */
+  public MojoParameter getMojoConfiguration(ArtifactKey pluginKey, String mojo, IProgressMonitor monitor)
+      throws CoreException;
+
+  /**
+   * Calculates available configuration of a number of mojos.
+   */
+  public MojoParameter getMojoConfiguration(ArtifactKey pluginKey, Collection<String> mojos, IProgressMonitor monitor)
+      throws CoreException;
+
+  /**
+   * Calculates available configuration of all mojos provided by specified plugin.
+   */
+  public MojoParameter getMojoConfiguration(ArtifactKey pluginKey, IProgressMonitor monitor) throws CoreException;
+
+  /**
+   * Calculates available configuration of a single plugin class.
+   */
+  public MojoParameter getClassConfiguration(ArtifactKey pluginKey, String className, IProgressMonitor monitor)
+      throws CoreException;
+
+}
diff --git a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/MojoParameter.java b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/MojoParameter.java
index 57814148..2b2702e9 100644
--- a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/internal/mojo/MojoParameter.java
+++ b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/MojoParameter.java
@@ -9,14 +9,14 @@
  *      Anton Tanasenko. - initial API and implementation
  *******************************************************************************/
 
-package org.eclipse.m2e.editor.xml.internal.mojo;
+package org.eclipse.m2e.editor.xml.mojo;
 
 import java.util.Collections;
 import java.util.List;
 
 
 /**
- * @author atanasenko
+ * @since 1.6
  */
 public class MojoParameter {
 
@@ -48,16 +48,16 @@ public class MojoParameter {
     this(name, type, Collections.singletonList(parameter));
   }
 
-  protected MojoParameter(String name, String type) {
+  public MojoParameter(String name, String type) {
     this(name, type, Collections.<MojoParameter> emptyList());
   }
 
-  MojoParameter multiple() {
+  public MojoParameter multiple() {
     this.multiple = true;
     return this;
   }
 
-  MojoParameter map() {
+  public MojoParameter map() {
     this.map = true;
     return this;
   }
@@ -71,11 +71,7 @@ public class MojoParameter {
   }
 
   public List<MojoParameter> getNestedParameters() {
-    return Collections.unmodifiableList(nested);
-  }
-
-  void setNestedParameters(List<MojoParameter> nested) {
-    this.nested = nested;
+    return nested == null ? Collections.<MojoParameter> emptyList() : Collections.unmodifiableList(nested);
   }
 
   public String getName() {
diff --git a/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/PlexusConfigHelper.java b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/PlexusConfigHelper.java
new file mode 100644
index 00000000..b5287132
--- /dev/null
+++ b/org.eclipse.m2e.editor.xml/src/main/java/org/eclipse/m2e/editor/xml/mojo/PlexusConfigHelper.java
@@ -0,0 +1,460 @@
+/*******************************************************************************

+ * Copyright (c) 2015 Takari, Inc.

+ * All rights reserved. This program and the accompanying materials

+ * are made available under the terms of the Eclipse Public License v1.0

+ * which accompanies this distribution, and is available at

+ * http://www.eclipse.org/legal/epl-v10.html

+ *

+ * Contributors:

+ *      Anton Tanasenko - initial API and implementation

+ *******************************************************************************/

+

+package org.eclipse.m2e.editor.xml.mojo;

+

+import java.io.File;

+import java.io.IOException;

+import java.lang.reflect.Field;

+import java.lang.reflect.Method;

+import java.lang.reflect.Modifier;

+import java.lang.reflect.ParameterizedType;

+import java.lang.reflect.Type;

+import java.net.URI;

+import java.net.URL;

+import java.util.ArrayList;

+import java.util.Arrays;

+import java.util.Collection;

+import java.util.Collections;

+import java.util.Date;

+import java.util.HashMap;

+import java.util.List;

+import java.util.Map;

+import java.util.Properties;

+import java.util.Set;

+

+import org.slf4j.Logger;

+import org.slf4j.LoggerFactory;

+

+import com.google.common.collect.ImmutableSet;

+import com.google.common.reflect.ClassPath;

+import com.google.common.reflect.ClassPath.ClassInfo;

+

+import org.eclipse.core.runtime.CoreException;

+import org.eclipse.core.runtime.IProgressMonitor;

+

+import org.codehaus.plexus.classworlds.realm.ClassRealm;

+

+

+/**

+ * Mirrors logic implemented in default maven mojo configurator with regards to discovering how a PlexusConfiguration

+ * can be applied to an arbitrary object tree.

+ * 

+ * @see org.codehaus.plexus.component.configurator.BasicComponentConfigurator

+ * @see org.codehaus.plexus.component.configurator.converters.lookup.DefaultConverterLookup

+ * @see org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter

+ * @since 1.6

+ */

+public class PlexusConfigHelper {

+

+  private static final Logger log = LoggerFactory.getLogger(PlexusConfigHelper.class);

+

+  private Map<Class<?>, List<MojoParameter>> processedClasses;

+

+  public PlexusConfigHelper() {

+    processedClasses = new HashMap<>();

+  }

+

+  public List<MojoParameter> loadParameters(ClassRealm realm, Class<?> paramClass, IProgressMonitor monitor)

+      throws CoreException {

+

+    if(monitor.isCanceled()) {

+      return Collections.emptyList();

+    }

+

+    List<MojoParameter> parameters = processedClasses.get(paramClass);

+    if(parameters == null) {

+      parameters = new ArrayList<>();

+      processedClasses.put(paramClass, parameters);

+

+      log.debug("Loading properties of {}", paramClass.getName());

+      Map<String, Type> properties = getClassProperties(paramClass);

+

+      for(Map.Entry<String, Type> e : properties.entrySet()) {

+        if(!monitor.isCanceled()) {

+          addParameter(realm, paramClass, e.getValue(), e.getKey(), null, parameters, false, null, null, null, monitor);

+        }

+      }

+    }

+

+    return parameters;

+  }

+

+  public void addParameter(ClassRealm realm, Class<?> enclosingClass, Type paramType, String name, String alias,

+      List<MojoParameter> parameters, boolean required, String expression, String description, String defaultValue,

+      IProgressMonitor monitor) throws CoreException {

+

+    Class<?> paramClass = getRawType(paramType);

+    if(paramClass == null) {

+      return;

+    }

+

+    // inline

+    if(isInline(paramClass)) {

+      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType)), required, expression,

+          description, defaultValue));

+      if(alias != null) {

+        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType)), required, expression,

+            description, defaultValue));

+      }

+      return;

+    }

+

+    // map

+    if(Map.class.isAssignableFrom(paramClass)) {

+      // we can't do anything with maps, unfortunately

+      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType)).map(), required, expression,

+          description, defaultValue));

+      if(alias != null) {

+        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType)).map(), required, expression,

+            description, defaultValue));

+      }

+      return;

+    }

+

+    // properties

+    if(Properties.class.isAssignableFrom(paramClass)) {

+

+      MojoParameter nested = new MojoParameter("property", "property",

+          Arrays.asList(new MojoParameter("name", "String"), new MojoParameter("value", "String")));

+

+      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType), nested), required, expression,

+          description, defaultValue));

+      if(alias != null) {

+        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType), nested), required, expression,

+            description, defaultValue));

+      }

+    }

+

+    // collection/array

+    Type itemType = getItemType(paramType);

+

+    if(itemType != null) {

+

+      List<MojoParameter> nested = getItemParameters(realm, enclosingClass, name, itemType, monitor);

+

+      parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType), nested), required, expression,

+          description, defaultValue));

+

+      if(alias != null) {

+        nested = getItemParameters(realm, enclosingClass, alias, itemType, monitor);

+        parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType), nested), required, expression,

+            description, defaultValue));

+      }

+

+      return;

+    }

+

+    // pojo

+    // skip classes without no-arg constructors

+    try {

+      paramClass.getConstructor(new Class[0]);

+    } catch(NoSuchMethodException ex) {

+      return;

+    }

+

+    List<MojoParameter> nested = loadParameters(realm, paramClass, monitor);

+    parameters.add(configure(new MojoParameter(name, getTypeDisplayName(paramType), nested), required, expression,

+        description, defaultValue));

+    if(alias != null) {

+      parameters.add(configure(new MojoParameter(alias, getTypeDisplayName(paramType), nested), required, expression,

+          description, defaultValue));

+    }

+

+  }

+

+  public List<MojoParameter> getItemParameters(ClassRealm realm, Class<?> enclosingClass, String name, Type paramType,

+      IProgressMonitor monitor) throws CoreException {

+

+    Class<?> paramClass = getRawType(paramType);

+

+    if(paramClass == null || isInline(paramClass)) {

+      MojoParameter container = new MojoParameter(toSingularName(name), getTypeDisplayName(paramType)).multiple();

+      return Collections.singletonList(container);

+    }

+

+    if(Map.class.isAssignableFrom(paramClass) || Properties.class.isAssignableFrom(paramClass)) {

+      MojoParameter container = new MojoParameter(toSingularName(name), getTypeDisplayName(paramType)).multiple().map();

+      return Collections.singletonList(container);

+    }

+

+    Type itemType = getItemType(paramType);

+

+    if(itemType != null) {

+      List<MojoParameter> nested = getItemParameters(realm, enclosingClass, name, itemType, monitor);

+      MojoParameter container = new MojoParameter(toSingularName(name), getTypeDisplayName(paramType), nested)

+          .multiple();

+      return Collections.singletonList(container);

+    }

+

+    @SuppressWarnings("rawtypes")

+    List<Class> parameterClasses = getCandidateClasses(realm, enclosingClass, paramClass);

+

+    List<MojoParameter> parameters = new ArrayList<>();

+    for(Class<?> clazz : parameterClasses) {

+

+      String paramName;

+      if(clazz.equals(paramClass)) {

+        paramName = toSingularName(name);

+      } else {

+        paramName = clazz.getSimpleName();

+        paramName = Character.toLowerCase(paramName.charAt(0)) + paramName.substring(1);

+      }

+

+      List<MojoParameter> nested = loadParameters(realm, paramClass, monitor);

+      MojoParameter container = new MojoParameter(paramName, getTypeDisplayName(clazz), nested).multiple();

+      parameters.add(container);

+    }

+

+    return parameters;

+  }

+

+  public static MojoParameter configure(MojoParameter p, boolean required, String expression, String description,

+      String defaultValue) {

+    p.setRequired(required);

+    p.setExpression(expression);

+    p.setDescription(description);

+    p.setDefaultValue(defaultValue);

+    return p;

+  }

+

+  public static Class<?> getRawType(Type type) {

+    if(type instanceof Class) {

+      return (Class<?>) type;

+    }

+    if(type instanceof ParameterizedType) {

+      return (Class<?>) ((ParameterizedType) type).getRawType();

+    }

+    return null;

+  }

+

+  public static Type getItemType(Type paramType) {

+

+    Class<?> paramClass = getRawType(paramType);

+

+    if(paramClass != null && paramClass.isArray()) {

+      return paramClass.getComponentType();

+    }

+    if(!Collection.class.isAssignableFrom(paramClass)) {

+      return null;

+    }

+

+    if(paramType instanceof ParameterizedType) {

+      ParameterizedType pt = (ParameterizedType) paramType;

+

+      Type[] args = pt.getActualTypeArguments();

+      if(args.length > 0) {

+        return args[0];

+      }

+    }

+

+    return null;

+  }

+

+  public Map<String, Type> getClassProperties(Class<?> clazz) {

+    Map<String, Type> props = new HashMap<>();

+

+    for(Method m : clazz.getMethods()) {

+      if((m.getModifiers() & Modifier.STATIC) != 0) {

+        continue;

+      }

+

+      String name = m.getName();

+

+      if((name.startsWith("add") || name.startsWith("set")) && m.getParameterTypes().length == 1) { //$NON-NLS-1$ //$NON-NLS-2$

+        String prop = name.substring(3);

+        if(!prop.isEmpty()) {

+          prop = Character.toLowerCase(prop.charAt(0)) + prop.substring(1);

+          if(!props.containsKey(prop)) {

+            props.put(prop, m.getGenericParameterTypes()[0]);

+          }

+        }

+      }

+    }

+

+    Class<?> pClazz = clazz;

+    while(pClazz != null && !pClazz.equals(Object.class)) {

+

+      for(Field f : pClazz.getDeclaredFields()) {

+        if((f.getModifiers() & (Modifier.STATIC | Modifier.FINAL)) != 0) {

+          continue;

+        }

+

+        String prop = f.getName();

+

+        if(!props.containsKey(prop)) {

+

+          props.put(prop, f.getGenericType());

+

+        }

+      }

+      pClazz = pClazz.getSuperclass();

+

+    }

+

+    return props;

+  }

+

+  @SuppressWarnings({"rawtypes", "unchecked"})

+  public List<Class> getCandidateClasses(ClassRealm realm, Class enclosingClass, Class paramClass) {

+

+    String name = enclosingClass.getName();

+    int dot = name.lastIndexOf('.');

+    if(dot > 0) {

+      String pkg = name.substring(0, dot);

+

+      List<Class> candidateClasses = null;

+

+      ClassPath cp;

+      try {

+        cp = ClassPath.from(realm);

+      } catch(IOException e) {

+        log.error(e.getMessage());

+        return Collections.singletonList(enclosingClass);

+      }

+

+      for(ClassInfo ci : cp.getTopLevelClasses(pkg)) {

+        Class clazz;

+        try {

+          clazz = realm.loadClass(ci.getName());

+        } catch(ClassNotFoundException e) {

+          log.error(e.getMessage(), e);

+          continue;

+        }

+

+        if((clazz.getModifiers() & (Modifier.ABSTRACT)) != 0) {

+          continue;

+        }

+

+        if(!paramClass.isAssignableFrom(clazz)) {

+          continue;

+        }

+

+        // skip classes without no-arg constructors

+        try {

+          clazz.getConstructor(new Class[0]);

+        } catch(NoSuchMethodException ex) {

+          continue;

+        }

+

+        if(candidateClasses == null) {

+          candidateClasses = new ArrayList<Class>();

+        }

+        candidateClasses.add(clazz);

+

+      }

+

+      if(candidateClasses != null) {

+        return candidateClasses;

+      }

+    }

+

+    return Collections.singletonList(paramClass);

+  }

+

+  public static boolean isInline(Class<?> paramClass) {

+    return INLINE_TYPES.contains(paramClass.getName()) || paramClass.isEnum();

+  }

+

+  public static String getTypeDisplayName(Type type) {

+    Class<?> clazz = getRawType(type);

+

+    if(clazz == null) {

+      return type.toString();

+    }

+

+    if(clazz.isArray()) {

+      return getTypeDisplayName(clazz.getComponentType()) + "[]"; //$NON-NLS-1$

+    }

+

+    if(type instanceof ParameterizedType) {

+      ParameterizedType ptype = (ParameterizedType) type;

+      StringBuilder sb = new StringBuilder();

+      sb.append(getTypeDisplayName(clazz)).append("&lt;"); //$NON-NLS-1$

+

+      boolean first = true;

+      for(Type arg : ptype.getActualTypeArguments()) {

+        if(first)

+          first = false;

+        else

+          sb.append(", "); //$NON-NLS-1$

+        sb.append(getTypeDisplayName(arg));

+      }

+

+      return sb.append("&gt;").toString(); //$NON-NLS-1$

+    }

+

+    String name = clazz.getName();

+    int idx = name.lastIndexOf('.');

+    if(idx == -1) {

+      return name;

+    }

+    // remove common package names

+    String pkg = name.substring(0, idx);

+    if(pkg.equals("java.lang") || pkg.equals("java.util") || pkg.equals("java.io")) { //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

+      return clazz.getSimpleName();

+    }

+    return name;

+  }

+

+  public String toSingularName(String name) {

+    if(name == null || name.trim().isEmpty()) {

+      return name;

+    }

+    if(name.endsWith("ies")) { //$NON-NLS-1$

+      return name.substring(0, name.length() - 3) + "y"; //$NON-NLS-1$

+    } else if(name.endsWith("ches")) { //$NON-NLS-1$ $NON-NLS-2$

+      return name.substring(0, name.length() - 2);

+    } else if(name.endsWith("xes")) { //$NON-NLS-1$

+      return name.substring(0, name.length() - 2);

+    } else if(name.endsWith("s") && (name.length() != 1)) { //$NON-NLS-1$

+      return name.substring(0, name.length() - 1);

+    }

+    return name;

+  }

+

+  private static final Set<String> INLINE_TYPES;

+

+  static {

+    // @formatter:off

+    INLINE_TYPES = ImmutableSet.<String>of(

+      byte.class.getName(),

+      Byte.class.getName(),

+      short.class.getName(),

+      Short.class.getName(),

+      int.class.getName(),

+      Integer.class.getName(),

+      long.class.getName(),

+      Long.class.getName(),

+      float.class.getName(),

+      Float.class.getName(),

+      double.class.getName(),

+      Double.class.getName(),

+      boolean.class.getName(),

+      Boolean.class.getName(),

+      char.class.getName(),

+      Character.class.getName(),

+  

+      String.class.getName(),

+      StringBuilder.class.getName(),

+      StringBuffer.class.getName(),

+  

+      File.class.getName(),

+      URI.class.getName(),

+      URL.class.getName(),

+      Date.class.getName(),

+  

+      "org.codehaus.plexus.configuration.PlexusConfiguration"

+    );

+    // @formatter:on

+  }

+

+}