/*******************************************************************************
 * Copyright (c) 2004-2008 Andras Schmidt, Andras Balogh, Istvan Rath and Daniel Varro
 * 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:
 *    Andras Schmidt, Andras Balogh, Istvan Rath - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.core.simple.cache;

import java.util.Collection;
import java.util.Iterator;

import org.eclipse.viatra2.core.IModelElement;
import org.eclipse.viatra2.core.simple.SimpleEntity;

public class TrickyCollection implements Collection<IModelElement> {

	private SimpleEntity owner;

	private Collection<IModelElement> col;

	public TrickyCollection(Collection<IModelElement> c, SimpleEntity o) {
		col = c;
		owner = o;
	}

	public boolean add(IModelElement arg0) {
		return false;
	}

	public boolean addAll(Collection arg0) {
		return false;
	}

	public void clear() {

	}

	public boolean contains(Object arg0) {
		IModelElement me = (IModelElement) arg0;
		return me.isBelowNamespace(owner);
	}

	public boolean containsAll(Collection arg0) {
		if (col == null) {
			col = owner._getAllComponents();
		}
		return col.containsAll(arg0);
	}

	public boolean isEmpty() {
		if (col == null) {
			col = owner._getAllComponents();
		}
		return col.isEmpty();
	}

	public Iterator<IModelElement> iterator() {
		if (col == null) {
			col = owner._getAllComponents();
		}
		return col.iterator();
	}

	public boolean remove(Object arg0) {
		return false;
	}

	public boolean removeAll(Collection arg0) {
		return false;
	}

	public boolean retainAll(Collection arg0) {
		return false;
	}

	public int size() {
		if (col == null) {
			col = owner._getAllComponents();
		}
		return col.size();
	}

	public Object[] toArray() {
		if (col == null) {
			col = owner._getAllComponents();
		}
		return col.toArray();
	}

	public Object[] toArray(Object[] arg0) {
		if (col == null) {
			col = owner._getAllComponents();
		}
		return col.toArray(arg0);
	}

}