/*
 *  License (BSD Style License):
 *   Copyright (c) 2011
 *   Software Engineering
 *   Department of Computer Science
 *   Technische Universität Darmstadt
 *   All rights reserved.
 * 
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions are met:
 * 
 *   - Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   - Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *   - Neither the name of the Software Engineering Group or Technische 
 *     Universität Darmstadt nor the names of its contributors may be used to 
 *     endorse or promote products derived from this software without specific 
 *     prior written permission.
 * 
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 *   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *   POSSIBILITY OF SUCH DAMAGE.
 */
package de.tud.cs.st.vespucci.vespucci_model.diagram.providers;

import java.lang.ref.WeakReference;

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;

/**
 * @generated
 */
public class VespucciEditPartProvider extends AbstractEditPartProvider {

	/**
	 * @generated
	 */
	private EditPartFactory factory;

	/**
	 * @generated
	 */
	private boolean allowCaching;

	/**
	 * @generated
	 */
	private WeakReference cachedPart;

	/**
	 * @generated
	 */
	private WeakReference cachedView;

	/**
	 * @generated
	 */
	public VespucciEditPartProvider() {
		setFactory(new de.tud.cs.st.vespucci.vespucci_model.diagram.edit.parts.VespucciEditPartFactory());
		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
	 */
	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
	 */
	public synchronized boolean provides(IOperation operation) {
		if (operation instanceof CreateGraphicEditPartOperation) {
			View view = ((IEditPartOperation) operation).getView();
			if (!de.tud.cs.st.vespucci.vespucci_model.diagram.edit.parts.ShapesDiagramEditPart.MODEL_ID
					.equals(de.tud.cs.st.vespucci.vespucci_model.diagram.part.VespucciVisualIDRegistry.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;
	}
}