IdComparator.java

package org.dynamoframework.domain.comparator;

/*-
 * #%L
 * Dynamo Framework
 * %%
 * Copyright (C) 2014 - 2024 Open Circle Solutions
 * %%
 * 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.
 * #L%
 */

import org.dynamoframework.domain.AbstractEntity;

import java.util.Comparator;

/**
 * A comparator for comparing entities based on their IDs (entities without
 * IDs are returned first)
 *
 * @author bas.rutten
 */
public class IdComparator implements Comparator<AbstractEntity<Integer>> {

	@Override
	public int compare(AbstractEntity<Integer> o1, AbstractEntity<Integer> o2) {
		if (o1.getId() == null) {
			return -1;
		}
		if (o2.getId() == null) {
			return 1;
		}
		return o1.getId().compareTo(o2.getId());
	}

}