/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.erlide.ui.util;
import java.util.HashSet;
import java.util.Set;
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.resources.ResourcesPlugin;
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.erlide.util.ErlLogger;
/**
* 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 final Set<IResource> fChangedElements;
public ProjectErrorVisitor(final Set<IResource> changedElements) {
fChangedElements = changedElements;
}
@Override
public boolean visit(final IResourceDelta delta) throws CoreException {
final IResource res = delta.getResource();
if (res instanceof IProject && delta.getKind() == IResourceDelta.CHANGED) {
final IProject project = (IProject) res;
if (!project.isAccessible()) {
// only track open Erlang projects
return false;
}
}
checkInvalidate(delta, res);
return true;
}
private void checkInvalidate(final IResourceDelta delta, final IResource resource0) {
IResource resource = resource0;
final 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(final IResourceDelta delta) {
if ((delta.getFlags() & IResourceDelta.MARKERS) != 0) {
final IMarkerDelta[] markerDeltas = delta.getMarkerDeltas();
for (int i = 0; i < markerDeltas.length; i++) {
if (markerDeltas[i].isSubtypeOf(IMarker.PROBLEM)) {
final int kind = markerDeltas[i].getKind();
if (kind == IResourceDelta.ADDED
|| kind == IResourceDelta.REMOVED) {
return true;
}
final int severity = markerDeltas[i].getAttribute(
IMarker.SEVERITY, -1);
final int newSeverity = markerDeltas[i].getMarker().getAttribute(
IMarker.SEVERITY, -1);
if (newSeverity != severity) {
return true;
}
}
}
}
return false;
}
}
private final ListenerList fListeners;
public ProblemMarkerManager() {
fListeners = new ListenerList();
}
/*
* @see IResourceChangeListener#resourceChanged
*/
@Override
public void resourceChanged(final IResourceChangeEvent event) {
final HashSet<IResource> changedElements = new HashSet<IResource>();
try {
final IResourceDelta delta = event.getDelta();
if (delta != null) {
delta.accept(new ProjectErrorVisitor(changedElements));
}
} catch (final CoreException e) {
ErlLogger.error(e);
}
if (!changedElements.isEmpty()) {
final IResource[] changes = changedElements
.toArray(new IResource[changedElements.size()]);
fireChanges(changes, true);
}
}
@Override
public void modelChanged(final IAnnotationModel model) {
// no action
}
@Override
public void modelChanged(final AnnotationModelEvent event) {
if (event instanceof ErlangModuleAnnotationModelEvent) {
final ErlangModuleAnnotationModelEvent emEvent = (ErlangModuleAnnotationModelEvent) event;
if (emEvent.includesProblemMarkerAnnotationChanges()) {
final IResource[] changes = new IResource[] { emEvent
.getUnderlyingResource() };
fireChanges(changes, false);
}
}
}
/**
* Adds a listener for problem marker changes.
*/
public void addListener(final IProblemChangedListener listener) {
if (fListeners.isEmpty()) {
ResourcesPlugin.getWorkspace().addResourceChangeListener(this);
// JavaPlugin.getDefault().getCompilationUnitDocumentProvider()
// .addGlobalAnnotationModelListener(this);
// FIXME use some kind of Erlide model-listener
}
fListeners.add(listener);
}
/**
* Removes a <code>IProblemChangedListener</code>.
*/
public void removeListener(final IProblemChangedListener listener) {
fListeners.remove(listener);
if (fListeners.isEmpty()) {
ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
// JavaPlugin.getDefault().getCompilationUnitDocumentProvider()
// .removeGlobalAnnotationModelListener(this);
// FIXME use some kind of Erlide model-listener
}
}
private void fireChanges(final IResource[] changes, final boolean isMarkerChange) {
DisplayUtils.asyncExec(new Runnable() {
@Override
@SuppressWarnings("synthetic-access")
public void run() {
final Object[] listeners = fListeners.getListeners();
for (int i = 0; i < listeners.length; i++) {
final IProblemChangedListener curr = (IProblemChangedListener) listeners[i];
curr.problemsChanged(changes, isMarkerChange);
}
}
});
}
}