org.conqat.lib.commons.collections.IdentifierBasedComparatorBase Maven / Gradle / Ivy

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Provides common utility functions

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/*
 * Copyright (c) CQSE GmbH
 *
 * 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.conqat.lib.commons.collections;

import java.util.Comparator;

/**
 * Base class for comparators that compare to objects by comparing a suitable object identifier.
 * 
 * @author deissenb
 */
public abstract class IdentifierBasedComparatorBase, T> implements Comparator {

	/** Compare by identifier. */
	@Override
	public int compare(T object1, T object2) {
		return obtainIdentifier(object1).compareTo(obtainIdentifier(object2));
	}

	/** Get identifier for object. */
	abstract protected I obtainIdentifier(T object);
}