ConstraintViolationComparator.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 net.formio.validation;

import java.util.Comparator;

import javax.validation.ConstraintViolation;

/**
 * Compares two {@link ConstraintViolation}s to ensure deterministic order of violation
 * constraints.
 * @author Radek Beran
 */
class ConstraintViolationComparator implements Comparator<ConstraintViolation<?>> {

	@Override
	public int compare(ConstraintViolation<?> v1, ConstraintViolation<?> v2) {
		if (v1 == null || v1.getMessageTemplate() == null) return 1;
		if (v2 == null || v2.getMessageTemplate() == null) return -1;
		return v1.getMessageTemplate().compareTo(v2.getMessageTemplate());
	}

}