Provide a way to specify that a project cannot be converted to Maven

- I wrote 100% of the code;
- I have the right to contribute the code to Eclipse;
- The file header contains the appropriate License header

3 files changed, 37 insertions, 4 deletions

diff --git a/org.eclipse.m2e.core.ui/plugin.properties b/org.eclipse.m2e.core.ui/plugin.properties
index da48ae02..bc485714 100644
--- a/org.eclipse.m2e.core.ui/plugin.properties
+++ b/org.eclipse.m2e.core.ui/plugin.properties
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2007, 2008 Sonatype, Inc.
+# Copyright (c) 2007, 2013 Sonatype, 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
@@ -110,6 +110,7 @@ extension-point.mappingdefault.name = Default Maven Lifecycle Mappings
 extension-point.component.name = Maven Core Component Contributor
 extension-point.changed.name = mavenProjectChangedListeners
 extension-point.lifecycleMappingMetadataSource.name = Lifecycle Mapping Metadata Source
+extension-point.conversionEnabler.name = Project Conversion Enabler
 convert.to.maven.name=Convert to Maven Project
 
 m2.build.directory.filter.name=Maven build folder
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenArtifactComponent.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenArtifactComponent.java
index 78ee06bf..dc2566ee 100644
--- a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenArtifactComponent.java
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenArtifactComponent.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2008-2010 Sonatype, Inc.
+ * Copyright (c) 2008-2013 Sonatype, 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
@@ -215,6 +215,12 @@ public class MavenArtifactComponent extends Composite {
     versionCombo.setText(version);
   }
 
+  public void setPackagingTypes(String[] packagingTypes) {
+    if(packagingCombo != null) {
+      packagingCombo.setItems(packagingTypes);
+    }
+  }
+
   public void setPackaging(String packaging) {
     if(packagingCombo != null) {
       packagingCombo.setText(packaging);
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenPomWizardPage.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenPomWizardPage.java
index 3c14363b..8ecf355b 100644
--- a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenPomWizardPage.java
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/wizards/MavenPomWizardPage.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2008-2010 Sonatype, Inc.
+ * Copyright (c) 2008-2013 Sonatype, 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
@@ -12,8 +12,10 @@
 package org.eclipse.m2e.core.ui.internal.wizards;
 
 import org.eclipse.core.resources.IContainer;
+import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.IStructuredSelection;
@@ -30,6 +32,9 @@ import org.eclipse.ui.dialogs.ContainerSelectionDialog;
 
 import org.apache.maven.model.Model;
 
+import org.eclipse.m2e.core.MavenPlugin;
+import org.eclipse.m2e.core.project.conversion.IProjectConversionEnabler;
+import org.eclipse.m2e.core.project.conversion.IProjectConversionManager;
 import org.eclipse.m2e.core.ui.internal.Messages;
 
 
@@ -43,6 +48,8 @@ public class MavenPomWizardPage extends AbstractMavenWizardPage {
 
   private MavenArtifactComponent pomComponent;
 
+  private IProjectConversionEnabler projectConversionEnabler;
+
   public MavenPomWizardPage(ISelection selection) {
     super("wizardPage"); //$NON-NLS-1$
     setTitle(Messages.MavenPomWizardPage_title);
@@ -89,6 +96,8 @@ public class MavenPomWizardPage extends AbstractMavenWizardPage {
    * Tests if the current workbench selection is a suitable container to use.
    */
   private void initialize() {
+    String packagingToUse = MavenArtifactComponent.DEFAULT_PACKAGING;
+    String[] availablePackagingTypes = MavenArtifactComponent.PACKAGING_OPTIONS;
     if(selection != null && !selection.isEmpty() && selection instanceof IStructuredSelection) {
       IStructuredSelection ssel = (IStructuredSelection) selection;
       if(ssel.size() > 1) {
@@ -105,11 +114,20 @@ public class MavenPomWizardPage extends AbstractMavenWizardPage {
         projectText.setText(container.getFullPath().toString());
         pomComponent.setArtifactId(container.getName());
         pomComponent.setGroupId(container.getName());
+        if(container instanceof IProject) {
+          IProjectConversionManager pcm = MavenPlugin.getProjectConversionManager();
+          projectConversionEnabler = pcm.getConversionEnablerForProject((IProject) container);
+          if(projectConversionEnabler != null) {
+            availablePackagingTypes = projectConversionEnabler.getPackagingTypes((IProject) container);
+            packagingToUse = availablePackagingTypes[0];
+          }
+        }
       }
     }
 
     pomComponent.setVersion(MavenArtifactComponent.DEFAULT_VERSION);
-    pomComponent.setPackaging(MavenArtifactComponent.DEFAULT_PACKAGING);
+    pomComponent.setPackagingTypes(availablePackagingTypes);
+    pomComponent.setPackaging(packagingToUse);
     pomComponent.setFocus();
   }
 
@@ -175,6 +193,14 @@ public class MavenPomWizardPage extends AbstractMavenWizardPage {
       return;
     }
 
+    if(container instanceof IProject && projectConversionEnabler != null) {
+      IStatus status = projectConversionEnabler.canBeConverted((IProject) container);
+      if(status.getSeverity() == IStatus.ERROR) {
+        updateStatus(status.getMessage());
+        return;
+      }
+    }
+
     // TODO
     if(pomComponent.getGroupId().length() == 0) {
       updateStatus(Messages.MavenPomWizardPage_error_grid);