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/*******************************************************************************
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* Copyright (c) 2003, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.ui.internal.navigator.extensions;
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import java.lang.ref.SoftReference;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeSet;
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import java.util.WeakHashMap;
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import org.eclipse.core.runtime.IConfigurationElement;
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import org.eclipse.core.runtime.SafeRunner;
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import org.eclipse.jface.resource.ImageDescriptor;
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import org.eclipse.jface.resource.ImageRegistry;
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import org.eclipse.swt.graphics.Image;
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import org.eclipse.ui.internal.navigator.NavigatorPlugin;
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import org.eclipse.ui.internal.navigator.NavigatorSafeRunnable;
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import org.eclipse.ui.internal.navigator.Policy;
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import org.eclipse.ui.internal.navigator.VisibilityAssistant;
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import org.eclipse.ui.internal.navigator.VisibilityAssistant.VisibilityListener;
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import org.eclipse.ui.navigator.INavigatorContentDescriptor;
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import org.eclipse.ui.navigator.OverridePolicy;
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import org.eclipse.ui.plugin.AbstractUIPlugin;
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/**
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* @since 3.2
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*/
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public class NavigatorContentDescriptorManager {
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private static final NavigatorContentDescriptorManager INSTANCE = new NavigatorContentDescriptorManager();
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private final Map firstClassDescriptorsMap = new HashMap();
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private final Map allDescriptors = new HashMap();
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private class EvaluationCache implements VisibilityListener {
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private final Map evaluations/* <Object, NavigatorContentDescriptor[]> */= new HashMap();
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private final Map evaluationsWithOverrides/*<Object, NavigatorContentDescriptor[]>*/ = new HashMap();
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EvaluationCache(VisibilityAssistant anAssistant) {
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anAssistant.addListener(this);
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}
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protected final NavigatorContentDescriptor[] getDescriptors(Object anElement) {
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return getDescriptors(anElement, true);
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}
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protected final void setDescriptors(Object anElement, NavigatorContentDescriptor[] theDescriptors) {
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setDescriptors(anElement, theDescriptors, true);
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}
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protected final NavigatorContentDescriptor[] getDescriptors(Object anElement, boolean toComputeOverrides) {
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if (anElement == null)
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return null;
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NavigatorContentDescriptor[] cachedDescriptors = null;
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if (toComputeOverrides) {
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SoftReference cache = (SoftReference) evaluations.get(anElement);
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if (cache != null && (cachedDescriptors = (NavigatorContentDescriptor[]) cache.get()) == null)
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evaluations.remove(anElement);
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return cachedDescriptors;
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}
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SoftReference cache = (SoftReference) evaluationsWithOverrides.get(anElement);
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if (cache != null && (cachedDescriptors = (NavigatorContentDescriptor[]) cache.get()) == null)
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evaluationsWithOverrides.remove(anElement);
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return cachedDescriptors;
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}
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protected final void setDescriptors(Object anElement, NavigatorContentDescriptor[] theDescriptors, boolean toComputeOverrides) {
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if (anElement != null) {
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if (toComputeOverrides)
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evaluations.put(new EvalutationReference(anElement), new SoftReference(theDescriptors));
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else
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evaluationsWithOverrides.put(new EvalutationReference(anElement), new SoftReference(theDescriptors));
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}
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}
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/*
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* (non-Javadoc)
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*
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* @see org.eclipse.ui.internal.navigator.VisibilityAssistant.VisibilityListener#onVisibilityOrActivationChange()
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*/
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public void onVisibilityOrActivationChange() {
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evaluations.clear();
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evaluationsWithOverrides.clear();
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}
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}
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/* Map of (VisibilityAssistant, EvaluationCache)-pairs */
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private final Map cachedTriggerPointEvaluations = new WeakHashMap();
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/* Map of (VisibilityAssistant, EvaluationCache)-pairs */
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private final Map cachedPossibleChildrenEvaluations = new WeakHashMap();
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private ImageRegistry imageRegistry;
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private final Set overridingDescriptors = new HashSet();
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private final Set saveablesProviderDescriptors = new HashSet();
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private final Set sortOnlyDescriptors = new HashSet();
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private final Set firstClassDescriptorsSet = new HashSet();
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/**
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* @return the singleton instance of the manager
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*/
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public static NavigatorContentDescriptorManager getInstance() {
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return INSTANCE;
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}
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private NavigatorContentDescriptorManager() {
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new NavigatorContentDescriptorRegistry().readRegistry();
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}
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/**
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*
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* @return Returns all content descriptor(s).
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*/
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public NavigatorContentDescriptor[] getAllContentDescriptors() {
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NavigatorContentDescriptor[] finalDescriptors = new NavigatorContentDescriptor[allDescriptors
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.size()];
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finalDescriptors = (NavigatorContentDescriptor[]) allDescriptors.values().toArray(finalDescriptors);
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Arrays.sort(finalDescriptors, ExtensionSequenceNumberComparator.INSTANCE);
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return finalDescriptors;
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}
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/**
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*
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* @return Returns all content descriptors that provide saveables.
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*/
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public NavigatorContentDescriptor[] getContentDescriptorsWithSaveables() {
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NavigatorContentDescriptor[] finalDescriptors = new NavigatorContentDescriptor[saveablesProviderDescriptors
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.size()];
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saveablesProviderDescriptors.toArray(finalDescriptors);
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Arrays.sort(finalDescriptors, ExtensionSequenceNumberComparator.INSTANCE);
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return finalDescriptors;
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}
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/**
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*
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* @return Returns all content descriptors that are sort only
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*/
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public NavigatorContentDescriptor[] getSortOnlyContentDescriptors() {
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NavigatorContentDescriptor[] finalDescriptors = new NavigatorContentDescriptor[sortOnlyDescriptors
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.size()];
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sortOnlyDescriptors.toArray(finalDescriptors);
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Arrays.sort(finalDescriptors, ExtensionSequenceNumberComparator.INSTANCE);
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return finalDescriptors;
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}
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/**
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*
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* Returns all content descriptor(s) which enable for the given element.
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*
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* @param anElement
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* the element to return the best content descriptor for
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*
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* @param aVisibilityAssistant
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* The relevant viewer assistant; used to filter out unbound
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* content descriptors.
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* @param considerOverrides
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* @return the best content descriptor for the given element.
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*/
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public Set findDescriptorsForTriggerPoint(Object anElement,
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VisibilityAssistant aVisibilityAssistant, boolean considerOverrides) {
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return findDescriptors(anElement, cachedTriggerPointEvaluations, aVisibilityAssistant, considerOverrides, !POSSIBLE_CHILD);
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}
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/**
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*
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* Returns all content descriptor(s) which enable for the given element.
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*
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* @param anElement
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* the element to return the best content descriptor for
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*
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* @param aVisibilityAssistant
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* The relevant viewer assistant; used to filter out unbound
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* content descriptors.
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* @param toComputeOverrides
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* @return the best content descriptor for the given element.
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*/
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public Set findDescriptorsForPossibleChild(Object anElement,
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VisibilityAssistant aVisibilityAssistant, boolean toComputeOverrides) {
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return findDescriptors(anElement, cachedPossibleChildrenEvaluations, aVisibilityAssistant, toComputeOverrides, POSSIBLE_CHILD);
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}
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private static final boolean POSSIBLE_CHILD = true;
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private Set findDescriptors(Object anElement,
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Map cachedEvaluations, VisibilityAssistant aVisibilityAssistant, boolean considerOverrides, boolean possibleChild) {
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EvaluationCache cache = getEvaluationCache(
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cachedEvaluations, aVisibilityAssistant);
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Set descriptors = new TreeSet(ExtensionSequenceNumberComparator.INSTANCE);
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NavigatorContentDescriptor[] cachedDescriptors = null;
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if ((cachedDescriptors = cache.getDescriptors(anElement)) != null) {
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descriptors.addAll(Arrays.asList(cachedDescriptors));
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}
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if (considerOverrides) {
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addDescriptorsConsideringOverrides(anElement, firstClassDescriptorsSet, aVisibilityAssistant, descriptors, possibleChild);
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if (Policy.DEBUG_RESOLUTION) {
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System.out.println("Find descriptors for: " + Policy.getObjectString(anElement) + //$NON-NLS-1$
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": " + descriptors); //$NON-NLS-1$
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}
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} else {
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/* Find other ContentProviders which enable for this object */
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for (Iterator contentDescriptorsItr = firstClassDescriptorsSet.iterator(); contentDescriptorsItr.hasNext();) {
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NavigatorContentDescriptor descriptor = (NavigatorContentDescriptor) contentDescriptorsItr.next();
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if (aVisibilityAssistant.isActive(descriptor) && aVisibilityAssistant.isVisible(descriptor)
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&& (possibleChild ? descriptor.isPossibleChild(anElement) : descriptor.isTriggerPoint(anElement))) {
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descriptors.add(descriptor);
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}
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}
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}
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cache.setDescriptors(anElement, (NavigatorContentDescriptor[]) descriptors.toArray(new NavigatorContentDescriptor[descriptors.size()]));
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return descriptors;
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}
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private EvaluationCache getEvaluationCache(Map anEvaluationMap,
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VisibilityAssistant aVisibilityAssistant) {
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EvaluationCache c = (EvaluationCache) anEvaluationMap
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.get(aVisibilityAssistant);
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if (c == null) {
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anEvaluationMap.put(aVisibilityAssistant, c = new EvaluationCache(
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aVisibilityAssistant));
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}
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return c;
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}
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private boolean addDescriptorsConsideringOverrides(Object anElement,
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Set theChildDescriptors, VisibilityAssistant aVisibilityAssistant,
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Set theFoundDescriptors, boolean possibleChild) {
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int initialSize = theFoundDescriptors.size();
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NavigatorContentDescriptor descriptor;
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/* Find other ContentProviders which enable for this object */
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for (Iterator contentDescriptorsItr = theChildDescriptors.iterator(); contentDescriptorsItr
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.hasNext();) {
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descriptor = (NavigatorContentDescriptor) contentDescriptorsItr
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.next();
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boolean isApplicable = aVisibilityAssistant.isActive(descriptor)
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&& aVisibilityAssistant.isVisible(descriptor)
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&& (possibleChild ? descriptor.isPossibleChild(anElement) : descriptor.isTriggerPoint(anElement));
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if (descriptor.hasOverridingExtensions()) {
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boolean isOverridden;
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Set overridingDescriptors = new TreeSet(ExtensionSequenceNumberComparator.INSTANCE);
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isOverridden = addDescriptorsConsideringOverrides(anElement, descriptor.getOverriddingExtensions(),
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aVisibilityAssistant, overridingDescriptors, possibleChild);
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if (!isOverridden && isApplicable) {
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theFoundDescriptors.add(descriptor);
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} else if (isOverridden) {
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theFoundDescriptors.addAll(overridingDescriptors);
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}
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} else if (isApplicable) {
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theFoundDescriptors.add(descriptor);
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}
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}
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return initialSize < theFoundDescriptors.size();
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}
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/**
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* Returns the navigator content descriptor with the given id.
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*
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* @param id
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* The id of the content descriptor that should be returned
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* @return The content descriptor of the given id
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*/
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public NavigatorContentDescriptor getContentDescriptor(String id) {
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return (NavigatorContentDescriptor) allDescriptors.get(id);
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}
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/**
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*
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* @param descriptorId
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* The unique id of a particular descriptor
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* @return The name (value of the 'name' attribute) of the given descriptor
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*/
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public String getText(String descriptorId) {
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INavigatorContentDescriptor descriptor = getContentDescriptor(descriptorId);
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if (descriptor != null) {
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return descriptor.getName();
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}
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return descriptorId;
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}
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/**
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*
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* @param descriptorId
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* The unique id of a particular descriptor
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* @return The image (corresponding to the value of the 'icon' attribute) of
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* the given descriptor
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*/
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public Image getImage(String descriptorId) {
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return retrieveAndStoreImage(descriptorId);
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}
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protected Image retrieveAndStoreImage(String descriptorId) {
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NavigatorContentDescriptor contentDescriptor = getContentDescriptor(descriptorId);
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Image image = null;
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if (contentDescriptor != null) {
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String icon = contentDescriptor.getIcon();
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if (icon != null) {
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image = getImageRegistry().get(icon);
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if (image == null || image.isDisposed()) {
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ImageDescriptor imageDescriptor = AbstractUIPlugin
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.imageDescriptorFromPlugin(contentDescriptor
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.getContribution().getPluginId(), icon);
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if (imageDescriptor != null) {
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image = imageDescriptor.createImage();
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if (image != null) {
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getImageRegistry().put(icon, image);
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}
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}
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}
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}
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}
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return image;
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}
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/**
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* @param desc
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*/
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private void addNavigatorContentDescriptor(NavigatorContentDescriptor desc) {
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if (desc == null) {
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return;
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}
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synchronized (firstClassDescriptorsMap) {
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if (firstClassDescriptorsMap.containsKey(desc.getId())) {
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NavigatorPlugin
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.logError(
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0,
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"An extension already exists with id \"" + desc.getId() + "\".", null); //$NON-NLS-1$ //$NON-NLS-2$
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} else {
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if (desc.getSuppressedExtensionId() == null) {
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firstClassDescriptorsMap.put(desc.getId(), desc);
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firstClassDescriptorsSet.add(desc);
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if (Policy.DEBUG_EXTENSION_SETUP) {
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System.out.println("First class descriptor: " + desc); //$NON-NLS-1$
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}
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} else {
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overridingDescriptors.add(desc);
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if (Policy.DEBUG_EXTENSION_SETUP) {
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|
378
|
System.out.println("Overriding descriptor: " + desc); //$NON-NLS-1$
|
|
379
|
}
|
|
380
|
}
|
|
381
|
allDescriptors.put(desc.getId(), desc);
|
|
382
|
if (desc.hasSaveablesProvider()) {
|
|
383
|
saveablesProviderDescriptors.add(desc);
|
|
384
|
if (Policy.DEBUG_EXTENSION_SETUP) {
|
|
385
|
System.out.println("Saveables provider descriptor: " + desc); //$NON-NLS-1$
|
|
386
|
}
|
|
387
|
}
|
|
388
|
if (desc.isSortOnly()) {
|
|
389
|
sortOnlyDescriptors.add(desc);
|
|
390
|
if (Policy.DEBUG_EXTENSION_SETUP) {
|
|
391
|
System.out.println("SortOnly descriptor: " + desc); //$NON-NLS-1$
|
|
392
|
}
|
|
393
|
}
|
|
394
|
}
|
|
395
|
}
|
|
396
|
}
|
|
397
|
|
|
398
|
/**
|
|
399
|
*
|
|
400
|
*/
|
|
401
|
private void computeOverrides() {
|
|
402
|
if (overridingDescriptors.size() > 0) {
|
|
403
|
NavigatorContentDescriptor descriptor;
|
|
404
|
NavigatorContentDescriptor overriddenDescriptor;
|
|
405
|
for (Iterator overridingIterator = overridingDescriptors.iterator(); overridingIterator
|
|
406
|
.hasNext();) {
|
|
407
|
descriptor = (NavigatorContentDescriptor) overridingIterator
|
|
408
|
.next();
|
|
409
|
overriddenDescriptor = (NavigatorContentDescriptor) allDescriptors
|
|
410
|
.get(descriptor.getSuppressedExtensionId());
|
|
411
|
if (overriddenDescriptor != null) {
|
|
412
|
|
|
413
|
if (Policy.DEBUG_EXTENSION_SETUP) {
|
|
414
|
System.out.println(descriptor + " overrides: " + overriddenDescriptor); //$NON-NLS-1$
|
|
415
|
}
|
|
416
|
/*
|
|
417
|
* add the descriptor as an overriding extension for its
|
|
418
|
* suppressed extension
|
|
419
|
*/
|
|
420
|
overriddenDescriptor.getOverriddingExtensions().add(
|
|
421
|
descriptor);
|
|
422
|
descriptor.setOverriddenDescriptor(overriddenDescriptor);
|
|
423
|
/*
|
|
424
|
* the always policy implies this is also a top-level
|
|
425
|
* extension
|
|
426
|
*/
|
|
427
|
if (descriptor.getOverridePolicy() == OverridePolicy.InvokeAlwaysRegardlessOfSuppressedExt) {
|
|
428
|
if (Policy.DEBUG_EXTENSION_SETUP) {
|
|
429
|
System.out.println(descriptor + " is first class"); //$NON-NLS-1$
|
|
430
|
}
|
|
431
|
firstClassDescriptorsMap.put(descriptor.getId(),
|
|
432
|
descriptor);
|
|
433
|
firstClassDescriptorsSet.add(descriptor);
|
|
434
|
}
|
|
435
|
|
|
436
|
} else {
|
|
437
|
String message =
|
|
438
|
"Invalid suppressedExtensionId \"" //$NON-NLS-1$
|
|
439
|
+ descriptor.getSuppressedExtensionId()
|
|
440
|
+ "\" specified from \"" //$NON-NLS-1$
|
|
441
|
+ descriptor.getId() + "\" in \"" + descriptor.getContribution() //$NON-NLS-1$
|
|
442
|
.getPluginId()
|
|
443
|
+ "\". No extension with matching id found."; //$NON-NLS-1$
|
|
444
|
if (Policy.DEBUG_EXTENSION_SETUP) {
|
|
445
|
System.out.println("Error: " + message); //$NON-NLS-1$
|
|
446
|
}
|
|
447
|
NavigatorPlugin.logError(0, message, null);
|
|
448
|
}
|
|
449
|
}
|
|
450
|
}
|
|
451
|
}
|
|
452
|
|
|
453
|
private int findId(List list, String id) {
|
|
454
|
for (int i = 0, len = list.size(); i < len; i++) {
|
|
455
|
NavigatorContentDescriptor desc = (NavigatorContentDescriptor) list.get(i);
|
|
456
|
if (desc.getId().equals(id))
|
|
457
|
return i;
|
|
458
|
}
|
|
459
|
throw new RuntimeException("Can't find id: " + id); //$NON-NLS-1$
|
|
460
|
}
|
|
461
|
|
|
462
|
private void computeSequenceNumbers() {
|
|
463
|
NavigatorContentDescriptor[] descs = getAllContentDescriptors();
|
|
464
|
|
|
465
|
LinkedList list = new LinkedList();
|
|
466
|
for (int i = 0; i < descs.length; i++) {
|
|
467
|
list.add(descs[i]);
|
|
468
|
}
|
|
469
|
|
|
470
|
boolean changed = true;
|
|
471
|
while (changed) {
|
|
472
|
changed = false;
|
|
473
|
for (int i = 0, len = list.size(); i < len; i++) {
|
|
474
|
NavigatorContentDescriptor desc = (NavigatorContentDescriptor) list.get(i);
|
|
475
|
if (desc.getAppearsBeforeId() != null) {
|
|
476
|
int beforeInd = findId(list, desc.getAppearsBeforeId());
|
|
477
|
if (beforeInd < i) {
|
|
478
|
list.add(beforeInd, desc);
|
|
479
|
list.remove(i + 1);
|
|
480
|
changed = true;
|
|
481
|
}
|
|
482
|
}
|
|
483
|
}
|
|
484
|
}
|
|
485
|
|
|
486
|
for (int i = 0, len = list.size(); i < len; i++) {
|
|
487
|
NavigatorContentDescriptor desc = (NavigatorContentDescriptor) list.get(i);
|
|
488
|
desc.setSequenceNumber(i);
|
|
489
|
if (Policy.DEBUG_EXTENSION_SETUP) {
|
|
490
|
System.out.println("Descriptors by sequence: " + desc); //$NON-NLS-1$
|
|
491
|
}
|
|
492
|
}
|
|
493
|
}
|
|
494
|
|
|
495
|
private ImageRegistry getImageRegistry() {
|
|
496
|
if (imageRegistry == null) {
|
|
497
|
imageRegistry = new ImageRegistry();
|
|
498
|
}
|
|
499
|
return imageRegistry;
|
|
500
|
}
|
|
501
|
|
|
502
|
private class NavigatorContentDescriptorRegistry extends
|
|
503
|
NavigatorContentRegistryReader {
|
|
504
|
|
|
505
|
/*
|
|
506
|
* (non-Javadoc)
|
|
507
|
*
|
|
508
|
* @see org.eclipse.ui.internal.navigator.extensions.RegistryReader#readRegistry()
|
|
509
|
*/
|
|
510
|
public void readRegistry() {
|
|
511
|
super.readRegistry();
|
|
512
|
computeSequenceNumbers();
|
|
513
|
computeOverrides();
|
|
514
|
}
|
|
515
|
|
|
516
|
protected boolean readElement(final IConfigurationElement anElement) {
|
|
517
|
if (TAG_NAVIGATOR_CONTENT.equals(anElement.getName())) {
|
|
518
|
SafeRunner.run(new NavigatorSafeRunnable(anElement) {
|
|
519
|
public void run() throws Exception {
|
|
520
|
addNavigatorContentDescriptor(new NavigatorContentDescriptor(anElement));
|
|
521
|
}
|
|
522
|
});
|
|
523
|
}
|
|
524
|
return super.readElement(anElement);
|
|
525
|
}
|
|
526
|
}
|
|
527
|
|
|
528
|
}
|