/*
* Copyright 2002-2016 the original author or authors.
*
* 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.springframework.util.comparator;
import java.util.Comparator;
import org.junit.Test;
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;
/**
* Tests for {@link InstanceComparator}.
*
* @author Phillip Webb
*/
public class InstanceComparatorTests {
private C1 c1 = new C1();
private C2 c2 = new C2();
private C3 c3 = new C3();
private C4 c4 = new C4();
@Test
public void shouldCompareClasses() throws Exception {
Comparator<Object> comparator = new InstanceComparator<>(C1.class, C2.class);
assertThat(comparator.compare(c1, c1), is(0));
assertThat(comparator.compare(c1, c2), is(-1));
assertThat(comparator.compare(c2, c1), is(1));
assertThat(comparator.compare(c2, c3), is(-1));
assertThat(comparator.compare(c2, c4), is(-1));
assertThat(comparator.compare(c3, c4), is(0));
}
@Test
public void shouldCompareInterfaces() throws Exception {
Comparator<Object> comparator = new InstanceComparator<>(I1.class, I2.class);
assertThat(comparator.compare(c1, c1), is(0));
assertThat(comparator.compare(c1, c2), is(0));
assertThat(comparator.compare(c2, c1), is(0));
assertThat(comparator.compare(c1, c3), is(-1));
assertThat(comparator.compare(c3, c1), is(1));
assertThat(comparator.compare(c3, c4), is(0));
}
@Test
public void shouldCompareMix() throws Exception {
Comparator<Object> comparator = new InstanceComparator<>(I1.class, C3.class);
assertThat(comparator.compare(c1, c1), is(0));
assertThat(comparator.compare(c3, c4), is(-1));
assertThat(comparator.compare(c3, null), is(-1));
assertThat(comparator.compare(c4, null), is(0));
}
private static interface I1 {
}
private static interface I2 {
}
private static class C1 implements I1 {
}
private static class C2 implements I1 {
}
private static class C3 implements I2 {
}
private static class C4 implements I2 {
}
}