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/*******************************************************************************
* Copyright (c) 2005, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers.provisional;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelChangedListener;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelProxy2;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.debug.internal.ui.viewers.model.provisional.ITreeModelViewer;
import org.eclipse.jface.viewers.Viewer;
/**
* Common function for a model proxy.
* <p>
* Clients may subclass this class.
* </p>
* @since 3.2
*/
public abstract class AbstractModelProxy implements IModelProxy2 {
private IPresentationContext fContext;
private boolean fInstalled = false;
private ITreeModelViewer fViewer;
private boolean fDisposed = false;
private Job fInstallJob;
private ListenerList<IModelChangedListener> fListeners = new ListenerList<>();
protected ListenerList<IModelChangedListener> getListeners() {
synchronized (fListeners) {
return fListeners;
}
}
@Override
public void addModelChangedListener(IModelChangedListener listener) {
synchronized (fListeners) {
fListeners.add(listener);
}
}
@Override
public void removeModelChangedListener(IModelChangedListener listener) {
synchronized (fListeners) {
fListeners.remove(listener);
}
}
/**
* Notifies registered listeners of the given delta.
*
* @param delta model delta to broadcast
*/
public void fireModelChanged(IModelDelta delta) {
synchronized(this) {
if (!fInstalled || fDisposed) {
return;
}
}
final IModelDelta root = getRootDelta(delta);
for (IModelChangedListener iModelChangedListener : getListeners()) {
final IModelChangedListener listener = iModelChangedListener;
ISafeRunnable safeRunnable = new ISafeRunnable() {
@Override
public void handleException(Throwable exception) {
DebugUIPlugin.log(exception);
}
@Override
public void run() throws Exception {
listener.modelChanged(root, AbstractModelProxy.this);
}
};
SafeRunner.run(safeRunnable);
}
}
/**
* Returns the root node of the given delta.
*
* @param delta delta node
* @return returns the root of the given delta
*/
protected IModelDelta getRootDelta(IModelDelta delta) {
IModelDelta parent = delta.getParentDelta();
while (parent != null) {
delta = parent;
parent = delta.getParentDelta();
}
return delta;
}
@Override
public synchronized void dispose() {
if (fInstallJob != null) {
fInstallJob.cancel();
fInstallJob = null;
}
fDisposed = true;
fContext = null;
fViewer = null;
}
protected synchronized void setInstalled(boolean installed) {
fInstalled = installed;
}
protected synchronized boolean isInstalled() {
return fInstalled;
}
protected synchronized void setDisposed(boolean disposed) {
fDisposed = disposed;
}
@Override
public void initialize(ITreeModelViewer viewer) {
setDisposed(false);
synchronized(this) {
fViewer = viewer;
fContext = viewer.getPresentationContext();
fInstallJob = new Job("Model Proxy installed notification job") {//$NON-NLS-1$
@Override
protected IStatus run(IProgressMonitor monitor) {
synchronized(this) {
fInstallJob = null;
}
if (!monitor.isCanceled()) {
init(getTreeModelViewer().getPresentationContext());
setInstalled(true);
installed(getViewer());
}
return Status.OK_STATUS;
}
@Override
public boolean belongsTo(Object family) {
return AbstractModelProxy.this == family;
}
@Override
public boolean shouldRun() {
return !isDisposed();
}
};
fInstallJob.setSystem(true);
}
fInstallJob.schedule();
}
/**
* Returns the context this model proxy is installed in.
*
* @return presentation context, or <code>null</code> if this
* model proxy has been disposed
*/
public synchronized IPresentationContext getPresentationContext() {
return fContext;
}
@Override
public void init(IPresentationContext context) {
}
/*
* Subclasses should override as required.
*/
@Override
public void installed(Viewer viewer) {
}
/**
* Returns the viewer this proxy is installed in.
*
* @return viewer or <code>null</code> if not installed
*/
protected Viewer getViewer() {
return (Viewer)fViewer;
}
/**
* Returns the viewer this proxy is installed in.
*
* @return viewer or <code>null</code> if not installed
*/
protected ITreeModelViewer getTreeModelViewer() {
return fViewer;
}
@Override
public synchronized boolean isDisposed() {
return fDisposed;
}
}
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