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/*******************************************************************************
* Copyright (c) 2010 Oracle. 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:
* Oracle - initial API and implementation
*******************************************************************************/
package org.eclipse.jpt.common.core.internal.resource;
import static org.eclipse.jpt.common.core.internal.XPointUtil.findRequiredAttribute;
import static org.eclipse.jpt.common.core.internal.XPointUtil.log;
import static org.eclipse.jpt.common.core.internal.XPointUtil.logDuplicateExtension;
import static org.eclipse.jpt.common.core.internal.XPointUtil.logInvalidValue;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.TreeSet;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.expressions.ExpressionConverter;
import org.eclipse.core.resources.IProject;
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.Platform;
import org.eclipse.jpt.common.core.JptCommonCorePlugin;
import org.eclipse.jpt.common.core.internal.XPointUtil.XPointException;
import org.eclipse.jpt.common.core.internal.resource.ResourceLocatorConfig.Priority;
import org.eclipse.jpt.common.core.resource.ResourceLocator;
import org.eclipse.jpt.utility.internal.KeyedSet;
import org.eclipse.jpt.utility.internal.iterables.FilteringIterable;
import org.eclipse.jpt.utility.internal.iterables.TransformationIterable;
public class ResourceLocatorManager {
public static final String EXTENSION_POINT_ID = "resourceLocators"; //$NON-NLS-1$
public static final String QUALIFIED_EXTENSION_POINT_ID = JptCommonCorePlugin.PLUGIN_ID_ + EXTENSION_POINT_ID;
public static final String RESOURCE_LOCATOR_ELEMENT = "resourceLocator"; //$NON-NLS-1$
public static final String ID_ATTRIBUTE = "id"; //$NON-NLS-1$
public static final String CLASS_ATTRIBUTE = "class"; //$NON-NLS-1$
public static final String PRIORITY_ATTRIBUTE = "priority"; //$NON-NLS-1$
public static final String ENABLEMENT_ELEMENT = "enablement"; //$NON-NLS-1$
private static ResourceLocatorManager INSTANCE = new ResourceLocatorManager();
public static ResourceLocatorManager instance() {
return INSTANCE;
}
private KeyedSet<String, ResourceLocatorConfig> resourceLocatorConfigs;
private ResourceLocatorManager() {
this.resourceLocatorConfigs = new KeyedSet<String, ResourceLocatorConfig>();
readExtensions();
}
/**
* Return the {@link ResourceLocator} of highest priority that is acceptable
* for the given project
*/
public ResourceLocator getResourceLocator(final IProject project) {
Iterator<ResourceLocator> stream = new FilteringIterable<ResourceLocator>(
new TransformationIterable<ResourceLocatorConfig, ResourceLocator>(
new FilteringIterable<ResourceLocatorConfig>(
new TreeSet<ResourceLocatorConfig>(this.resourceLocatorConfigs.getItemSet())) {
@Override
protected boolean accept(ResourceLocatorConfig o) {
return o.isEnabledFor(project);
}
}) {
@Override
protected ResourceLocator transform(ResourceLocatorConfig o) {
return o.getResourceLocator();
}
}) {
@Override
protected boolean accept(ResourceLocator o) {
return o != null;
}
}.iterator();
return (stream.hasNext()) ? stream.next() : null;
}
private void readExtensions() {
final IExtensionRegistry registry = Platform.getExtensionRegistry();
final IExtensionPoint xpoint
= registry.getExtensionPoint(QUALIFIED_EXTENSION_POINT_ID);
if (xpoint == null) {
throw new IllegalStateException();
}
final List<IConfigurationElement> configs = new ArrayList<IConfigurationElement>();
for (IExtension extension : xpoint.getExtensions()) {
for (IConfigurationElement element : extension.getConfigurationElements()) {
configs.add(element);
}
}
for (IConfigurationElement element : configs) {
if (element.getName().equals(RESOURCE_LOCATOR_ELEMENT)) {
readExtension(element);
}
}
}
private void readExtension(IConfigurationElement element) {
try {
final ResourceLocatorConfig rlConfig = new ResourceLocatorConfig();
// plug-in id
rlConfig.setPluginId(element.getContributor().getName());
// resource locator id
rlConfig.setId(findRequiredAttribute(element, ID_ATTRIBUTE));
if (this.resourceLocatorConfigs.containsKey(rlConfig.getId())) {
logDuplicateExtension(QUALIFIED_EXTENSION_POINT_ID, ID_ATTRIBUTE, rlConfig.getId());
throw new XPointException();
}
// resource locator class name
rlConfig.setClassName(findRequiredAttribute(element, CLASS_ATTRIBUTE));
// priority
String priorityString = element.getAttribute(PRIORITY_ATTRIBUTE).trim();
Priority priority = Priority.get(priorityString);
if (priority == null) {
logInvalidValue(element, PRIORITY_ATTRIBUTE, priorityString);
throw new XPointException();
}
rlConfig.setPriority(priority);
// enablement
for (IConfigurationElement child : element.getChildren()) {
String childName = child.getName();
if (childName.equals(ENABLEMENT_ELEMENT)) {
Expression expr;
try {
expr = ExpressionConverter.getDefault().perform(child);
}
catch (CoreException e) {
log(e);
throw new XPointException();
}
rlConfig.setEnablementCondition(expr);
}
}
this.resourceLocatorConfigs.addItem(rlConfig.getId(), rlConfig);
}
catch (XPointException e) {
// Ignore and continue. The problem has already been reported to the user
// in the log.
}
}
}
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