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/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    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 org.deeplearning4j.berkeley;

import java.io.Serializable;
import java.util.*;

/**
 * The MapFactory is a mechanism for specifying what kind of map is to be used
 * by some object.  For example, if you want a Counter which is backed by an
 * IdentityHashMap instead of the defaul HashMap, you can pass in an
 * IdentityHashMapFactory.
 *
 * @author Dan Klein
 */

public abstract class MapFactory implements Serializable {

	public static class HashMapFactory extends MapFactory {
		private static final long serialVersionUID = 1L;

		public Map buildMap() {
			return new HashMap<>();
		}
	}

	public static class IdentityHashMapFactory extends MapFactory {
		private static final long serialVersionUID = 1L;

		public Map buildMap() {
			return new IdentityHashMap<>();
		}
	}

	public static class TreeMapFactory extends MapFactory {
		private static final long serialVersionUID = 1L;

		public Map buildMap() {
			return new TreeMap<>();
		}
	}

	public static class WeakHashMapFactory extends MapFactory {
		private static final long serialVersionUID = 1L;

		public Map buildMap() {
			return new WeakHashMap<>();
		}
	}

	public abstract Map buildMap();
}