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/*
* Copyright (c) 2010, 2012, 2015 Eike Stepper (Berlin, Germany) 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:
* Martin Fluegge - initial API and implementation
*
*/
package org.eclipse.emf.cdo.dawn.examples.acore.diagram.providers;
import org.eclipse.emf.cdo.dawn.examples.acore.diagram.edit.parts.ACoreRootEditPart;
import org.eclipse.emf.cdo.dawn.examples.acore.diagram.edit.parts.AcoreEditPartFactory;
import org.eclipse.emf.cdo.dawn.examples.acore.diagram.part.AcoreVisualIDRegistry;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPartFactory;
import org.eclipse.gmf.runtime.common.core.service.IOperation;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.services.editpart.AbstractEditPartProvider;
import org.eclipse.gmf.runtime.diagram.ui.services.editpart.CreateGraphicEditPartOperation;
import org.eclipse.gmf.runtime.diagram.ui.services.editpart.IEditPartOperation;
import org.eclipse.gmf.runtime.notation.View;
import java.lang.ref.WeakReference;
/**
* @generated
*/
public class AcoreEditPartProvider extends AbstractEditPartProvider
{
/**
* @generated
*/
private EditPartFactory factory;
/**
* @generated
*/
private boolean allowCaching;
/**
* @generated
*/
private WeakReference cachedPart;
/**
* @generated
*/
private WeakReference cachedView;
/**
* @generated
*/
public AcoreEditPartProvider()
{
setFactory(new AcoreEditPartFactory());
setAllowCaching(true);
}
/**
* @generated
*/
public final EditPartFactory getFactory()
{
return factory;
}
/**
* @generated
*/
protected void setFactory(EditPartFactory factory)
{
this.factory = factory;
}
/**
* @generated
*/
public final boolean isAllowCaching()
{
return allowCaching;
}
/**
* @generated
*/
protected synchronized void setAllowCaching(boolean allowCaching)
{
this.allowCaching = allowCaching;
if (!allowCaching)
{
cachedPart = null;
cachedView = null;
}
}
/**
* @generated
*/
protected IGraphicalEditPart createEditPart(View view)
{
EditPart part = factory.createEditPart(null, view);
if (part instanceof IGraphicalEditPart)
{
return (IGraphicalEditPart)part;
}
return null;
}
/**
* @generated
*/
protected IGraphicalEditPart getCachedPart(View view)
{
if (cachedView != null && cachedView.get() == view)
{
return (IGraphicalEditPart)cachedPart.get();
}
return null;
}
/**
* @generated
*/
@Override
public synchronized IGraphicalEditPart createGraphicEditPart(View view)
{
if (isAllowCaching())
{
IGraphicalEditPart part = getCachedPart(view);
cachedPart = null;
cachedView = null;
if (part != null)
{
return part;
}
}
return createEditPart(view);
}
/**
* @generated
*/
@Override
public synchronized boolean provides(IOperation operation)
{
if (operation instanceof CreateGraphicEditPartOperation)
{
View view = ((IEditPartOperation)operation).getView();
if (!ACoreRootEditPart.MODEL_ID.equals(AcoreVisualIDRegistry.getModelID(view)))
{
return false;
}
if (isAllowCaching() && getCachedPart(view) != null)
{
return true;
}
IGraphicalEditPart part = createEditPart(view);
if (part != null)
{
if (isAllowCaching())
{
cachedPart = new WeakReference(part);
cachedView = new WeakReference(view);
}
return true;
}
}
return false;
}
}
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