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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.viewsupport;
  12
  13 import java.util.HashSet;
  14
  15 import net.sourceforge.phpdt.internal.ui.util.SWTUtil;
  16 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  17 import net.sourceforge.phpeclipse.phpeditor.CompilationUnitAnnotationModelEvent;
  18
  19 import org.eclipse.core.resources.IMarker;
  20 import org.eclipse.core.resources.IMarkerDelta;
  21 import org.eclipse.core.resources.IProject;
  22 import org.eclipse.core.resources.IResource;
  23 import org.eclipse.core.resources.IResourceChangeEvent;
  24 import org.eclipse.core.resources.IResourceChangeListener;
  25 import org.eclipse.core.resources.IResourceDelta;
  26 import org.eclipse.core.resources.IResourceDeltaVisitor;
  27 import org.eclipse.core.runtime.CoreException;
  28 import org.eclipse.jface.text.source.AnnotationModelEvent;
  29 import org.eclipse.jface.text.source.IAnnotationModel;
  30 import org.eclipse.jface.text.source.IAnnotationModelListener;
  31 import org.eclipse.jface.text.source.IAnnotationModelListenerExtension;
  32 import org.eclipse.jface.util.ListenerList;
  33 import org.eclipse.swt.widgets.Display;
  34
  35 /**
  36  * Listens to resource deltas and filters for marker changes of type
  37  * IMarker.PROBLEM Viewers showing error ticks should register as listener to
  38  * this type.
  39  */
  40 public class ProblemMarkerManager implements IResourceChangeListener,
  41                 IAnnotationModelListener, IAnnotationModelListenerExtension {
  42
  43         /**
  44          * Visitors used to look if the element change delta containes a marker
  45          * change.
  46          */
  47         private static class ProjectErrorVisitor implements IResourceDeltaVisitor {
  48
  49                 private HashSet fChangedElements;
  50
  51                 public ProjectErrorVisitor(HashSet changedElements) {
  52                         fChangedElements = changedElements;
  53                 }
  54
  55                 public boolean visit(IResourceDelta delta) throws CoreException {
  56                         IResource res = delta.getResource();
  57                         if (res instanceof IProject
  58                                         && delta.getKind() == IResourceDelta.CHANGED) {
  59                                 try {
  60                                         IProject project = (IProject) res;
  61                                         if (!project.isAccessible()
  62                                                         || !project
  63                                                                         .hasNature(PHPeclipsePlugin.PHP_NATURE_ID)) {
  64                                                 // only track open Java projects
  65                                                 return false;
  66                                         }
  67                                 } catch (CoreException e) {
  68                                         PHPeclipsePlugin.log(e);
  69                                         return false;
  70                                 }
  71                         }
  72                         checkInvalidate(delta, res);
  73                         return true;
  74                 }
  75
  76                 private void checkInvalidate(IResourceDelta delta, IResource resource) {
  77                         int kind = delta.getKind();
  78                         if (kind == IResourceDelta.REMOVED || kind == IResourceDelta.ADDED
  79                                         || (kind == IResourceDelta.CHANGED && isErrorDelta(delta))) {
  80                                 // invalidate the resource and all parents
  81                                 while (resource.getType() != IResource.ROOT
  82                                                 && fChangedElements.add(resource)) {
  83                                         resource = resource.getParent();
  84                                 }
  85                         }
  86                 }
  87
  88                 private boolean isErrorDelta(IResourceDelta delta) {
  89                         if ((delta.getFlags() & IResourceDelta.MARKERS) != 0) {
  90                                 IMarkerDelta[] markerDeltas = delta.getMarkerDeltas();
  91                                 for (int i = 0; i < markerDeltas.length; i++) {
  92                                         if (markerDeltas[i].isSubtypeOf(IMarker.PROBLEM)) {
  93                                                 int kind = markerDeltas[i].getKind();
  94                                                 if (kind == IResourceDelta.ADDED
  95                                                                 || kind == IResourceDelta.REMOVED)
  96                                                         return true;
  97                                                 int severity = markerDeltas[i].getAttribute(
  98                                                                 IMarker.SEVERITY, -1);
  99                                                 int newSeverity = markerDeltas[i].getMarker()
 100                                                                 .getAttribute(IMarker.SEVERITY, -1);
 101                                                 if (newSeverity != severity)
 102                                                         return true;
 103                                         }
 104                                 }
 105                         }
 106                         return false;
 107                 }
 108         }
 109
 110         private ListenerList fListeners;
 111
 112         public ProblemMarkerManager() {
 113                 fListeners = new ListenerList(10);
 114         }
 115
 116         /*
 117          * @see IResourceChangeListener#resourceChanged
 118          */
 119         public void resourceChanged(IResourceChangeEvent event) {
 120                 HashSet changedElements = new HashSet();
 121
 122                 try {
 123                         IResourceDelta delta = event.getDelta();
 124                         if (delta != null)
 125                                 delta.accept(new ProjectErrorVisitor(changedElements));
 126                 } catch (CoreException e) {
 127                         PHPeclipsePlugin.log(e.getStatus());
 128                 }
 129
 130                 if (!changedElements.isEmpty()) {
 131                         IResource[] changes = (IResource[]) changedElements
 132                                         .toArray(new IResource[changedElements.size()]);
 133                         fireChanges(changes, true);
 134                 }
 135         }
 136
 137         /*
 138          * (non-Javadoc)
 139          *
 140          * @see IAnnotationModelListener#modelChanged(IAnnotationModel)
 141          */
 142         public void modelChanged(IAnnotationModel model) {
 143                 // no action
 144         }
 145
 146         /*
 147          * (non-Javadoc)
 148          *
 149          * @see IAnnotationModelListenerExtension#modelChanged(AnnotationModelEvent)
 150          */
 151         public void modelChanged(AnnotationModelEvent event) {
 152                 if (event instanceof CompilationUnitAnnotationModelEvent) {
 153                         CompilationUnitAnnotationModelEvent cuEvent = (CompilationUnitAnnotationModelEvent) event;
 154                         if (cuEvent.includesProblemMarkerAnnotationChanges()) {
 155                                 IResource[] changes = new IResource[] { cuEvent
 156                                                 .getUnderlyingResource() };
 157                                 fireChanges(changes, false);
 158                         }
 159                 }
 160         }
 161
 162         /**
 163          * Adds a listener for problem marker changes.
 164          */
 165         public void addListener(IProblemChangedListener listener) {
 166                 if (fListeners.isEmpty()) {
 167                         PHPeclipsePlugin.getWorkspace().addResourceChangeListener(this);
 168                         PHPeclipsePlugin.getDefault().getCompilationUnitDocumentProvider()
 169                                         .addGlobalAnnotationModelListener(this);
 170                 }
 171                 fListeners.add(listener);
 172         }
 173
 174         /**
 175          * Removes a <code>IProblemChangedListener</code>.
 176          */
 177         public void removeListener(IProblemChangedListener listener) {
 178                 fListeners.remove(listener);
 179                 if (fListeners.isEmpty()) {
 180                         PHPeclipsePlugin.getWorkspace().removeResourceChangeListener(this);
 181                         PHPeclipsePlugin.getDefault().getCompilationUnitDocumentProvider()
 182                                         .removeGlobalAnnotationModelListener(this);
 183                 }
 184         }
 185
 186         private void fireChanges(final IResource[] changes,
 187                         final boolean isMarkerChange) {
 188                 Display display = SWTUtil.getStandardDisplay();
 189                 if (display != null && !display.isDisposed()) {
 190                         display.asyncExec(new Runnable() {
 191                                 public void run() {
 192                                         Object[] listeners = fListeners.getListeners();
 193                                         for (int i = 0; i < listeners.length; i++) {
 194                                                 IProblemChangedListener curr = (IProblemChangedListener) listeners[i];
 195                                                 curr.problemsChanged(changes, isMarkerChange);
 196                                         }
 197                                 }
 198                         });
 199                 }
 200         }
 201
 202 }