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/*******************************************************************************
* Copyright (c) 2000, 2005 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.eclipse.team.ui.synchronize;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.ListenerList;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.util.SafeRunnable;
import org.eclipse.team.internal.ui.TeamUIPlugin;
import org.eclipse.ui.IMemento;
/**
* Abstract superclass of resource scopes for <code>SubscriberParticipant</code>
* instances.
* <p>
* Clients are not expected to subclass this class.
* </p>
* @see SubscriberParticipant
* @since 3.0
*/
public abstract class AbstractSynchronizeScope implements ISynchronizeScope {
/*
* Key for scope in memento
*/
private static final String CTX_SUBSCRIBER_SCOPE_TYPE = TeamUIPlugin.ID + ".SCOPE_TYPE"; //$NON-NLS-1$
/*
* Scope change listeners
*/
private ListenerList listeners = new ListenerList();
/**
* Save the scope to the given memento
*
* @param scope a scope
* @param settings a memento
*/
protected static void saveScope(ISynchronizeScope scope, IMemento settings) {
settings.putString(CTX_SUBSCRIBER_SCOPE_TYPE, getType(scope));
((AbstractSynchronizeScope)scope).saveState(settings);
}
/**
* Restore a scope from the given memento
*
* @param settings a memento
* @return the scope restored from the given memento
*/
protected static ISynchronizeScope createScope(IMemento settings) {
String type = settings.getString(CTX_SUBSCRIBER_SCOPE_TYPE);
if (type == null) {
return new WorkspaceScope();
}
if (type.equals("ResourceScope")) { //$NON-NLS-1$
return new ResourceScope(settings);
}
if (type.equals("WorkingSetScope")) { //$NON-NLS-1$
return new WorkingSetScope(settings);
}
return new WorkspaceScope();
}
private static String getType(ISynchronizeScope scope) {
String name = scope.getClass().getName();
int lastDot = name.lastIndexOf("."); //$NON-NLS-1$
if (lastDot == -1) {
return name;
}
return name.substring(lastDot + 1); //$NON-NLS-1$
}
/**
* Constuctor a scope from scratch
*/
protected AbstractSynchronizeScope() {
}
/**
* Constuctor a scope from a previously saved state
*/
protected AbstractSynchronizeScope(IMemento memento) {
init(memento);
}
/* (non-Javadoc)
* @see org.eclipse.team.internal.ui.synchronize.ScopableSubscriberParticipant.ISynchronizeScope#addPropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener)
*/
public void addPropertyChangeListener(IPropertyChangeListener listener) {
synchronized(listeners) {
listeners.add(listener);
}
}
/* (non-Javadoc)
* @see org.eclipse.team.internal.ui.synchronize.ScopableSubscriberParticipant.ISynchronizeScope#removePropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener)
*/
public void removePropertyChangeListener(IPropertyChangeListener listener) {
synchronized(listeners) {
listeners.remove(listeners);
}
}
/* (non-Javadoc)
* @see org.eclipse.team.ui.synchronize.ISynchronizeScope#dispose()
*/
public void dispose() {
// Do nothing by default
}
/**
* Fires the given property change event to all registered listsners.
*
* @param event the property change event to be fired
*/
protected void firePropertyChangedEvent(final PropertyChangeEvent event) {
Object[] allListeners;
synchronized(listeners) {
allListeners = listeners.getListeners();
}
for (int i = 0; i < allListeners.length; i++) {
final IPropertyChangeListener listener = (IPropertyChangeListener)allListeners[i];
Platform.run(new SafeRunnable() {
public void run() throws Exception {
listener.propertyChange(event);
}
});
}
}
/**
* Firs a change event for property <code>ISynchronizeScope.ROOTS</code>
* containing the new roots. The old roots are not provided in the event.
*/
protected void fireRootsChanges() {
firePropertyChangedEvent(new PropertyChangeEvent(this, ROOTS, new IResource[0], getRoots()));
}
/**
* Persist the state of this scope. Clients must persist enough additional
* state to know what type (i.e. subclass) of scope to be recreated.
*
* @param memento the memento into which the scope is to be saved
*/
public void saveState(IMemento memento) {
// Do nothing by default
}
/**
* Method invoked from the contructor which repopulats the fields of this scope
*
* @param memento the memento into which the scope was previously saved
*/
protected void init(IMemento memento) {
// Do nothing by default
}
}
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