/**
 * Copyright 2007 Charlie Hubbard
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package flexjson;

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class ChainedSet implements Set
{
	Set parent;
	Set child;

	public ChainedSet(Set parent)
	{
		this.parent= parent;
		this.child= new HashSet();
	}

	public int size()
	{
		return this.child.size() + parent.size();
	}

	public boolean isEmpty()
	{
		return this.child.isEmpty() && parent.isEmpty();
	}

	public boolean contains(Object o)
	{
		return child.contains(o) || parent.contains(o);
	}

	public Iterator iterator()
	{
		return new ChainedIterator(child, parent);
	}

	public Object[] toArray()
	{
		Object[] carr= child.toArray();
		Object[] parr= parent.toArray();
		Object[] combined= new Object[carr.length + parr.length];
		System.arraycopy(carr, 0, combined, 0, carr.length);
		System.arraycopy(parr, 0, combined, carr.length, parr.length);
		return combined;
	}

	public Object[] toArray(Object[] a)
	{
		throw new IllegalStateException("Not implemeneted");
	}

	public boolean add(Object o)
	{
		return child.add(o);
	}

	public boolean remove(Object o)
	{
		return child.remove(o);
	}

	public boolean containsAll(Collection c)
	{
		return child.containsAll(c) || parent.containsAll(c);
	}

	public boolean addAll(Collection c)
	{
		return child.addAll(c);
	}

	public boolean retainAll(Collection c)
	{
		return child.retainAll(c);
	}

	public boolean removeAll(Collection c)
	{
		return child.removeAll(c);
	}

	public void clear()
	{
		child.clear();
	}

	public Set getParent()
	{
		return parent;
	}
}