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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* 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:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.emf.cdo.ui.viewhistory;
import org.eclipse.emf.cdo.CDOView;
import org.eclipse.emf.cdo.CDOViewResourcesEvent;
import org.eclipse.emf.cdo.eresource.CDOResource;
import org.eclipse.net4j.util.event.Event;
import org.eclipse.net4j.util.event.IEvent;
import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.event.Notifier;
import org.eclipse.emf.ecore.resource.Resource;
import java.text.MessageFormat;
import java.util.HashSet;
import java.util.Set;
/**
* @author Eike Stepper
* @since 2.0
*/
public final class CDOViewHistory extends Notifier
{
private CDOView view;
private Set<CDOViewHistoryEntry> entries = new HashSet<CDOViewHistoryEntry>();
private IListener viewListener = new IListener()
{
public void notifyEvent(IEvent event)
{
if (event instanceof CDOViewResourcesEvent)
{
CDOViewResourcesEvent e = (CDOViewResourcesEvent)event;
if (e.getView() == view && e.getKind() == CDOViewResourcesEvent.Kind.ADDED)
{
addResource(e.getResourcePath());
}
}
}
};
public CDOViewHistory(CDOView view)
{
this.view = view;
view.addListener(viewListener);
}
public void dispose()
{
view.removeListener(viewListener);
entries.clear();
}
public CDOView getView()
{
return view;
}
public CDOViewHistoryEntry[] getEntries()
{
synchronized (entries)
{
return entries.toArray(new CDOViewHistoryEntry[entries.size()]);
}
}
public boolean hasEntries()
{
synchronized (entries)
{
return !entries.isEmpty();
}
}
public void reset()
{
Set<CDOViewHistoryEntry> openResources = new HashSet<CDOViewHistoryEntry>();
for (Resource resource : view.getResourceSet().getResources())
{
if (resource instanceof CDOResource)
{
CDOResource cdoResource = (CDOResource)resource;
openResources.add(new CDOViewHistoryEntry(view, cdoResource.getPath()));
}
}
boolean changed;
synchronized (entries)
{
changed = entries.retainAll(openResources);
}
if (changed)
{
fireEvent(new ViewHistoryEvent(null));
}
}
protected void addResource(String resourcePath)
{
CDOViewHistoryEntry entry = new CDOViewHistoryEntry(view, resourcePath);
boolean changed;
synchronized (entries)
{
changed = entries.add(entry);
}
if (changed)
{
fireEvent(new ViewHistoryEvent(entry));
}
}
/**
* @author Eike Stepper
*/
private final class ViewHistoryEvent extends Event implements CDOViewHistoryEvent
{
private static final long serialVersionUID = 1L;
CDOViewHistoryEntry addedEntry;
public ViewHistoryEvent(CDOViewHistoryEntry addedEntry)
{
super(CDOViewHistory.this);
this.addedEntry = addedEntry;
}
public CDOViewHistory getViewHistory()
{
return CDOViewHistory.this;
}
public CDOViewHistoryEntry getAddedEntry()
{
return addedEntry;
}
@Override
public String toString()
{
return MessageFormat.format("CDOViewHistoryEvent[source={0}, addedEntry={1}]", getSource(), getAddedEntry());
}
}
}
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