/*******************************************************************************
 * Copyright (c) 2001, 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.jst.j2ee.ejb.internal.impl;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jst.j2ee.ejb.ContainerManagedEntity;

/**
 * This filter will return a subset of the keyAttributes from the
 * ContainerManagedEntityExtension that is passed as an argument to the filter
 * method. It will remove any keyAttributes that are held by EjbRelationshipRole
 * objects (including inherited EjbRelationshipRole attributes). That means the
 * returned list of CMPAttributes will be key attributes that were defined
 * locally and all inherited key attributes minus any key attributes pointed to
 * by EjbRelationshipRoles, thus the key attributes will only be key attributes
 * that were defined by the user. Creation date: (11/28/2000 8:09:10 PM)
 * 
 * @author: Administrator
 */
public class ModelledKeyAttributeFilter extends ContainerManagedEntityFilter {
	private static ModelledKeyAttributeFilter singleton;

	protected List filterNotcached(ContainerManagedEntity cmp) {
		return getSourceAttributes(cmp);
	}

	/**
	 * Return the proper list of attributes from cmpExt. Return all attributes
	 * minus those added due to Relationship Roles.
	 */
	protected List getSourceAttributes(ContainerManagedEntity cmp) {
		List all, localRoleKeyAttributes;
		all = new ArrayList(cmp.getKeyAttributes());
		localRoleKeyAttributes = cmp
				.getFilteredFeatures(KeyRelationshipRoleAttributeFilter
						.singleton());
		filterRoleAttributesByName(all, localRoleKeyAttributes);
		return all;
	}

	/**
	 * Insert the method's description here. Creation date: (11/28/2000 5:36:00
	 * PM)
	 * 
	 * @return com.ibm.ejs.models.base.extensions.ejbext.impl.ModelledKeyAttributeFilter
	 */
	public static ModelledKeyAttributeFilter singleton() {
		if (singleton == null)
			singleton = new ModelledKeyAttributeFilter();
		return singleton;
	}
}