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/*
 * Licensed to ElasticSearch and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. ElasticSearch licenses this
 * file to you 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 org.elasticsearch.common.collect;

import java.io.Serializable;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;

/**
 *
 */
public class MapBackedSet extends AbstractSet implements Serializable {

    private static final long serialVersionUID = -6761513279741915432L;

    private final Map map;

    /**
     * Creates a new instance which wraps the specified {@code map}.
     */
    public MapBackedSet(Map map) {
        this.map = map;
    }

    @Override
    public int size() {
        return map.size();
    }

    @Override
    public boolean contains(Object o) {
        return map.containsKey(o);
    }

    @Override
    public boolean add(E o) {
        return map.put(o, Boolean.TRUE) == null;
    }

    @Override
    public boolean remove(Object o) {
        return map.remove(o) != null;
    }

    @Override
    public void clear() {
        map.clear();
    }

    @Override
    public Iterator iterator() {
        return map.keySet().iterator();
    }
}