src/org/apache/pig/data/InternalMap.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.pig.data;

import java.util.HashMap;

/**
 * This class is an empty extension of Map<Object, Object>.  It only
 * exists so that DataType.findType() can distinguish an internal map
 * type that maps object to object from an external map type that
 * is string to object.
 *
 */
public class InternalMap extends HashMap<Object, Object> {
    
	private static final long serialVersionUID = 1L;

    public InternalMap() {
        super();
    }
    
    public InternalMap(int size) {
        super(size);
    }

}