/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.views.markers.internal;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.ui.views.tasklist.ITaskListResourceAdapter;

/**
 * The DefaultMarkerResourceAdapter is the default
 * implementation of the IMarkerResourceAdapter used by the
 * MarkerView for resource adaption.
 */
class DefaultMarkerResourceAdapter implements ITaskListResourceAdapter {
	
	private static ITaskListResourceAdapter singleton;

	/**
	 * Constructor for DefaultMarkerResourceAdapter.
	 */
	DefaultMarkerResourceAdapter() {
		super();
	}
	
	/**
	 * Return the default instance used for MarkerView adapting.
	 */
	static ITaskListResourceAdapter getDefault(){
		if(singleton == null)
			singleton = new DefaultMarkerResourceAdapter();
		return singleton;
	}

	/**
	 * @see IMarkerResourceAdapter#getAffectedResource(IAdaptable)
	 */
	public IResource getAffectedResource(IAdaptable adaptable) {
		IResource resource = (IResource) adaptable.getAdapter(IResource.class);
		
		if (resource == null)
			return (IFile) adaptable.getAdapter(IFile.class);
		else
			return resource;
	}
}