/*
* Copyright 2008, Unitils.org
*
* 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.jtester.hamcrest.matcher.property.comparator;
import org.jtester.hamcrest.matcher.property.difference.Difference;
import org.jtester.hamcrest.matcher.property.reflection.ReflectionComparator;
import java.util.Date;
/**
* Comparator that checks whether 2 dates are both null or not null, the actual time-value is not compared.
* This can be useful when the actual time/date is not known is advance but you still want to check whether
* a value has been set or not. E.g. a last modification timestamp in the databsse.
*
* @author Tim Ducheyne
* @author Filip Neven
*/
public class LenientDatesComparator implements Comparator {
/**
* Returns true if both objects are null or both objects are Date instances.
*
* @param left The left object
* @param right The right object
* @return True if null or dates
*/
public boolean canCompare(Object left, Object right) {
if (right == null && left == null) {
return true;
}
if (right instanceof Date && left instanceof Date) {
return true;
}
if ((right == null && left instanceof Date) || (left == null && right instanceof Date)) {
return true;
}
return false;
}
/**
* Compares the given dates.
*
* @param left The left date
* @param right The right date
* @param onlyFirstDifference True if only the first difference should be returned
* @param reflectionComparator The root comparator for inner comparisons, not null
* @return A difference if one of the dates is null and the other one not, else null
*/
public Difference compare(Object left, Object right, boolean onlyFirstDifference, ReflectionComparator reflectionComparator) {
if ((right == null && left instanceof Date) || (left == null && right instanceof Date)) {
return new Difference("Lenient dates, but not both instantiated or both null", left, right);
}
return null;
}
}