/*
* Copyright (c) 2011, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.eclipse.org/legal/epl-v10.html
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.dart.tools.ui.internal.viewsupport;
import com.google.dart.tools.ui.DartToolsPlugin;
import com.google.dart.tools.ui.internal.text.editor.CompilationUnitAnnotationModelEvent;
import com.google.dart.tools.ui.internal.util.SWTUtil;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IMarkerDelta;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.jface.text.source.AnnotationModelEvent;
import org.eclipse.jface.text.source.IAnnotationModel;
import org.eclipse.jface.text.source.IAnnotationModelListener;
import org.eclipse.jface.text.source.IAnnotationModelListenerExtension;
import org.eclipse.swt.widgets.Display;
import java.util.HashSet;
/**
* Listens to resource deltas and filters for marker changes of type IMarker.PROBLEM Viewers showing
* error ticks should register as listener to this type.
*/
public class ProblemMarkerManager implements IResourceChangeListener, IAnnotationModelListener,
IAnnotationModelListenerExtension {
/**
* Visitors used to look if the element change delta contains a marker change.
*/
private static class ProjectErrorVisitor implements IResourceDeltaVisitor {
private HashSet<IResource> fChangedElements;
public ProjectErrorVisitor(HashSet<IResource> changedElements) {
fChangedElements = changedElements;
}
@Override
public boolean visit(IResourceDelta delta) throws CoreException {
IResource res = delta.getResource();
if (res instanceof IProject && delta.getKind() == IResourceDelta.CHANGED) {
IProject project = (IProject) res;
if (!project.isAccessible()) {
// only track open Java projects
return false;
}
}
checkInvalidate(delta, res);
return true;
}
private void checkInvalidate(IResourceDelta delta, IResource resource) {
int kind = delta.getKind();
if (kind == IResourceDelta.REMOVED || kind == IResourceDelta.ADDED
|| (kind == IResourceDelta.CHANGED && isErrorDelta(delta))) {
// invalidate the resource and all parents
while (resource.getType() != IResource.ROOT && fChangedElements.add(resource)) {
resource = resource.getParent();
}
}
}
private boolean isErrorDelta(IResourceDelta delta) {
if ((delta.getFlags() & IResourceDelta.MARKERS) != 0) {
IMarkerDelta[] markerDeltas = delta.getMarkerDeltas();
for (int i = 0; i < markerDeltas.length; i++) {
if (markerDeltas[i].isSubtypeOf(IMarker.PROBLEM)) {
int kind = markerDeltas[i].getKind();
if (kind == IResourceDelta.ADDED || kind == IResourceDelta.REMOVED) {
return true;
}
int severity = markerDeltas[i].getAttribute(IMarker.SEVERITY, -1);
int newSeverity = markerDeltas[i].getMarker().getAttribute(IMarker.SEVERITY, -1);
if (newSeverity != severity) {
return true;
}
}
}
}
return false;
}
}
private ListenerList fListeners;
public ProblemMarkerManager() {
fListeners = new ListenerList();
}
/**
* Adds a listener for problem marker changes.
*/
public void addListener(IProblemChangedListener listener) {
if (fListeners.isEmpty()) {
DartToolsPlugin.getWorkspace().addResourceChangeListener(this);
DartToolsPlugin.getDefault().getCompilationUnitDocumentProvider().addGlobalAnnotationModelListener(
this);
}
fListeners.add(listener);
}
/*
* (non-Javadoc)
*
* @see IAnnotationModelListenerExtension#modelChanged(AnnotationModelEvent)
*/
@Override
public void modelChanged(AnnotationModelEvent event) {
if (event instanceof CompilationUnitAnnotationModelEvent) {
CompilationUnitAnnotationModelEvent cuEvent = (CompilationUnitAnnotationModelEvent) event;
if (cuEvent.includesProblemMarkerAnnotationChanges()) {
IResource[] changes = new IResource[] {cuEvent.getUnderlyingResource()};
fireChanges(changes, false);
}
}
}
/*
* (non-Javadoc)
*
* @see IAnnotationModelListener#modelChanged(IAnnotationModel)
*/
@Override
public void modelChanged(IAnnotationModel model) {
// no action
}
/**
* Removes a <code>IProblemChangedListener</code>.
*/
public void removeListener(IProblemChangedListener listener) {
fListeners.remove(listener);
if (fListeners.isEmpty()) {
DartToolsPlugin.getWorkspace().removeResourceChangeListener(this);
DartToolsPlugin.getDefault().getCompilationUnitDocumentProvider().removeGlobalAnnotationModelListener(
this);
}
}
/*
* @see IResourceChangeListener#resourceChanged
*/
@Override
public void resourceChanged(IResourceChangeEvent event) {
HashSet<IResource> changedElements = new HashSet<IResource>();
try {
IResourceDelta delta = event.getDelta();
if (delta != null) {
delta.accept(new ProjectErrorVisitor(changedElements));
}
} catch (CoreException e) {
DartToolsPlugin.log(e.getStatus());
}
if (!changedElements.isEmpty()) {
IResource[] changes = changedElements.toArray(new IResource[changedElements.size()]);
fireChanges(changes, true);
}
}
private void fireChanges(final IResource[] changes, final boolean isMarkerChange) {
Display display = SWTUtil.getStandardDisplay();
if (display != null && !display.isDisposed()) {
display.asyncExec(new Runnable() {
@Override
public void run() {
Object[] listeners = fListeners.getListeners();
for (int i = 0; i < listeners.length; i++) {
IProblemChangedListener curr = (IProblemChangedListener) listeners[i];
curr.problemsChanged(changes, isMarkerChange);
}
}
});
}
}
}