org.eclipse.mylyn.internal.java.ui.search.JavaActiveSearchResultUpdater.java Source code

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Here is the source code for org.eclipse.mylyn.internal.java.ui.search.JavaActiveSearchResultUpdater.java

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/*******************************************************************************
 * Copyright (c) 2004, 2009 Tasktop Technologies and others.
 * 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:
 *     Tasktop Technologies - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.java.ui.search;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.jdt.core.ElementChangedEvent;
import org.eclipse.jdt.core.IElementChangedListener;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaElementDelta;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.internal.ui.search.JavaSearchResult;
import org.eclipse.search.ui.IQueryListener;
import org.eclipse.search.ui.ISearchQuery;
import org.eclipse.search.ui.NewSearchUI;
import org.eclipse.search.ui.text.Match;

/**
 * COPIED FROM: org.eclipse.jdt.internal.ui.search.SearchResultUpdater
 * 
 * @author Shawn Minto
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public class JavaActiveSearchResultUpdater implements IElementChangedListener, IQueryListener {

    private final JavaSearchResult fResult;

    private static final int REMOVED_FLAGS = IJavaElementDelta.F_MOVED_TO
            | IJavaElementDelta.F_REMOVED_FROM_CLASSPATH | IJavaElementDelta.F_CLOSED | IJavaElementDelta.F_CONTENT;

    public JavaActiveSearchResultUpdater(JavaSearchResult result) {
        fResult = result;
        NewSearchUI.addQueryListener(this);
        JavaCore.addElementChangedListener(this);
        // TODO make this work with resources
    }

    public void elementChanged(ElementChangedEvent event) {
        // long t0= System.currentTimeMillis();
        IJavaElementDelta delta = event.getDelta();
        Set removedElements = new HashSet();
        Set potentiallyRemovedElements = new HashSet();
        collectRemoved(potentiallyRemovedElements, removedElements, delta);
        if (removedElements.size() > 0) {
            handleRemoved(removedElements);
        }
        if (potentiallyRemovedElements.size() > 0) {
            handleRemoved(potentiallyRemovedElements);
        }
    }

    private void handleRemoved(Set removedElements) {
        Object[] elements = fResult.getElements();
        for (Object element : elements) {
            if (isContainedInRemoved(removedElements, element)) {
                if (element instanceof IJavaElement) {
                    IJavaElement je = (IJavaElement) element;
                    if (!je.exists()) {
                        Match[] matches = fResult.getMatches(element);
                        for (Match matche : matches) {
                            fResult.removeMatch(matche);
                        }
                        // XXX remove edge and element
                    }
                } else if (element instanceof IResource) {
                    IResource resource = (IResource) element;
                    if (!resource.exists()) {
                        Match[] matches = fResult.getMatches(element);
                        for (Match matche : matches) {
                            fResult.removeMatch(matche);
                        }
                        // XXX remove edge and element
                    }

                }
            }
        }
    }

    private boolean isContainedInRemoved(Set removedElements, Object object) {
        for (Iterator elements = removedElements.iterator(); elements.hasNext();) {
            if (isParentOf(elements.next(), object)) {
                return true;
            }
        }
        return false;
    }

    private boolean isParentOf(Object ancestor, Object descendant) {
        while (descendant != null && !ancestor.equals(descendant)) {
            descendant = getParent(descendant);
        }
        return descendant != null;
    }

    private Object getParent(Object object) {
        if (object instanceof IJavaElement) {
            return ((IJavaElement) object).getParent();
        } else if (object instanceof IResource) {
            return ((IResource) object).getParent();
        }
        return null;
    }

    private void collectRemoved(Set potentiallyRemovedSet, Set removedElements, IJavaElementDelta delta) {
        if (delta.getKind() == IJavaElementDelta.REMOVED) {
            removedElements.add(delta.getElement());
        } else if (delta.getKind() == IJavaElementDelta.CHANGED) {
            int flags = delta.getFlags();
            if ((flags & REMOVED_FLAGS) != 0) {
                potentiallyRemovedSet.add(delta.getElement());
            } else {
                IJavaElementDelta[] childDeltas = delta.getAffectedChildren();
                for (IJavaElementDelta childDelta : childDeltas) {
                    collectRemoved(potentiallyRemovedSet, removedElements, childDelta);
                }
            }
        }
        IResourceDelta[] resourceDeltas = delta.getResourceDeltas();
        if (resourceDeltas != null) {
            for (IResourceDelta resourceDelta : resourceDeltas) {
                collectRemovals(removedElements, resourceDelta);
            }
        }
    }

    public void queryAdded(ISearchQuery query) {
        // don't care
    }

    public void queryRemoved(ISearchQuery query) {
        if (fResult.equals(query.getSearchResult())) {
            JavaCore.removeElementChangedListener(this);
            NewSearchUI.removeQueryListener(this);
        }
    }

    private void collectRemovals(Set removals, IResourceDelta delta) {
        if (delta.getKind() == IResourceDelta.REMOVED) {
            removals.add(delta.getResource());
        } else {
            IResourceDelta[] children = delta.getAffectedChildren();
            for (IResourceDelta element : children) {
                collectRemovals(removals, element);
            }
        }
    }

    public void queryStarting(ISearchQuery query) {
        // not interested
    }

    public void queryFinished(ISearchQuery query) {
        // not interested
    }

}