HashCoder.java

/***********************************************************************************************************************
 *
 * Copyright (C) 2010 by the Stratosphere project (http://stratosphere.eu)
 *
 * 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 eu.stratosphere.util;

/**
 * @author Arvid Heise
 */
public interface HashCoder<T> {
	public int hashCodeFor(Object object);

	public static class JavaHashCoder implements HashCoder<Object> {
		@Override
		public int hashCodeFor(final Object object) {
			return object.hashCode();
		}
	}

	public static class SystemHashCoder implements HashCoder<Object> {
		@Override
		public int hashCodeFor(final Object object) {
			return System.identityHashCode(object);
		}
	}

	public static HashCoder<Object> JavaHashCode = new JavaHashCoder(), SystemHashCode = new SystemHashCoder();
}