/*******************************************************************************
* Copyright (C) 2009, 2013 Yann Simon <yann.simon.fr@gmail.com> 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
*******************************************************************************/
package org.eclipse.egit.ui.internal.revision;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import org.eclipse.compare.IContentChangeListener;
import org.eclipse.compare.IContentChangeNotifier;
import org.eclipse.compare.IEditableContent;
import org.eclipse.compare.ISharedDocumentAdapter;
import org.eclipse.compare.ITypedElement;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.swt.widgets.Display;
import org.eclipse.team.core.history.IFileRevision;
import org.eclipse.team.internal.ui.synchronize.EditableSharedDocumentAdapter;
/**
* Editable revision which supports listening to content changes by adding
* {@link IContentChangeListener}.
*/
@SuppressWarnings("restriction")
public class EditableRevision extends FileRevisionTypedElement implements
IEditableContent, IContentChangeNotifier {
private final static class ContentChangeNotifier implements IContentChangeNotifier {
private ListenerList fListenerList;
private final IContentChangeNotifier element;
public ContentChangeNotifier(IContentChangeNotifier element) {
this.element = element;
}
/* (non-Javadoc)
* see IContentChangeNotifier.addChangeListener
*/
@Override
public void addContentChangeListener(IContentChangeListener listener) {
if (fListenerList == null)
fListenerList= new ListenerList();
fListenerList.add(listener);
}
/* (non-Javadoc)
* see IContentChangeNotifier.removeChangeListener
*/
@Override
public void removeContentChangeListener(IContentChangeListener listener) {
if (fListenerList != null) {
fListenerList.remove(listener);
if (fListenerList.isEmpty())
fListenerList= null;
}
}
/**
* Notifies all registered <code>IContentChangeListener</code>s of a content change.
*/
public void fireContentChanged() {
if (isEmpty()) {
return;
}
// Legacy listeners may expect to be notified in the UI thread.
Runnable runnable = new Runnable() {
@Override
public void run() {
Object[] listeners= fListenerList.getListeners();
for (int i= 0; i < listeners.length; i++) {
final IContentChangeListener contentChangeListener = (IContentChangeListener)listeners[i];
SafeRunner.run(new ISafeRunnable() {
@Override
public void run() throws Exception {
(contentChangeListener).contentChanged(element);
}
@Override
public void handleException(Throwable exception) {
// Logged by safe runner
}
});
}
}
};
if (Display.getCurrent() == null) {
Display.getDefault().syncExec(runnable);
} else {
runnable.run();
}
}
/**
* Return whether this notifier is empty (i.e. has no listeners).
* @return whether this notifier is empty
*/
public boolean isEmpty() {
return fListenerList == null || fListenerList.isEmpty();
}
}
private byte[] modifiedContent;
private ContentChangeNotifier fChangeNotifier;
private EditableSharedDocumentAdapter sharedDocumentAdapter;
/**
* @param fileRevision
* @param encoding the file encoding
*/
public EditableRevision(IFileRevision fileRevision, String encoding) {
super(fileRevision, encoding);
}
@Override
public boolean isEditable() {
return true;
}
@Override
public ITypedElement replace(ITypedElement dest, ITypedElement src) {
return null;
}
@Override
public InputStream getContents() throws CoreException {
if (modifiedContent != null) {
return new ByteArrayInputStream(modifiedContent);
}
return super.getContents();
}
@Override
public void setContent(byte[] newContent) {
modifiedContent = newContent;
fireContentChanged();
}
/**
* @return The modified content for reading. The data is owned by this
* class, do not modify it.
*/
public byte[] getModifiedContent() {
return modifiedContent;
}
@Override
public Object getAdapter(Class adapter) {
if (adapter == ISharedDocumentAdapter.class) {
return getSharedDocumentAdapter();
}
return Platform.getAdapterManager().getAdapter(this, adapter);
}
private synchronized ISharedDocumentAdapter getSharedDocumentAdapter() {
if (sharedDocumentAdapter == null)
sharedDocumentAdapter = new EditableSharedDocumentAdapter(
new EditableSharedDocumentAdapter.ISharedDocumentAdapterListener() {
@Override
public void handleDocumentConnected() {
// nothing
}
@Override
public void handleDocumentFlushed() {
// nothing
}
@Override
public void handleDocumentDeleted() {
// nothing
}
@Override
public void handleDocumentSaved() {
// nothing
}
@Override
public void handleDocumentDisconnected() {
// nothing
}
});
return sharedDocumentAdapter;
}
@Override
public void addContentChangeListener(IContentChangeListener listener) {
if (fChangeNotifier == null)
fChangeNotifier = new ContentChangeNotifier(this);
fChangeNotifier.addContentChangeListener(listener);
}
@Override
public void removeContentChangeListener(IContentChangeListener listener) {
if (fChangeNotifier != null) {
fChangeNotifier.removeContentChangeListener(listener);
if (fChangeNotifier.isEmpty())
fChangeNotifier = null;
}
}
/**
* Notifies all registered <code>IContentChangeListener</code>s of a content
* change.
*/
protected void fireContentChanged() {
if (fChangeNotifier == null || fChangeNotifier.isEmpty()) {
return;
}
fChangeNotifier.fireContentChanged();
}
@Override
public boolean equals(Object obj) {
return super.equals(obj);
}
@Override
public int hashCode() {
return super.hashCode();
}
}