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Java example source code file (HashCodeBuilderAndEqualsBuilderTest.java)

This example Java source code file (HashCodeBuilderAndEqualsBuilderTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

alltransientfixture, hashcodebuilderandequalsbuildertest, integer, object, same, string, suballtransientfixture, subtestfixture, test, testfixture

The HashCodeBuilderAndEqualsBuilderTest.java Java example source code

/*
 * 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 org.apache.commons.lang3.builder;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

/**
 * Tests {@link org.apache.commons.lang3.builder.HashCodeBuilder} and
 * {@link org.apache.commons.lang3.builder.EqualsBuilderTest} to insure that equal
 * objects must have equal hash codes.
 */
public class HashCodeBuilderAndEqualsBuilderTest {

    //-----------------------------------------------------------------------

    private void testInteger(final boolean testTransients) {
        final Integer i1 = Integer.valueOf(12345);
        final Integer i2 = Integer.valueOf(12345);
        assertEqualsAndHashCodeContract(i1, i2, testTransients);
    }

    @Test
    public void testInteger() {
        testInteger(false);
    }

    @Test
    public void testIntegerWithTransients() {
        testInteger(true);
    }

    @Test
    public void testFixture() {
        testFixture(false);
    }

    @Test
    public void testFixtureWithTransients() {
        testFixture(true);
    }

    private void testFixture(final boolean testTransients) {
        assertEqualsAndHashCodeContract(new TestFixture(2, 'c', "Test", (short) 2), new TestFixture(2, 'c', "Test", (short) 2), testTransients);
        assertEqualsAndHashCodeContract(
            new AllTransientFixture(2, 'c', "Test", (short) 2),
            new AllTransientFixture(2, 'c', "Test", (short) 2),
            testTransients);
        assertEqualsAndHashCodeContract(
            new SubTestFixture(2, 'c', "Test", (short) 2, "Same"),
            new SubTestFixture(2, 'c', "Test", (short) 2, "Same"),
            testTransients);
        assertEqualsAndHashCodeContract(
            new SubAllTransientFixture(2, 'c', "Test", (short) 2, "Same"),
            new SubAllTransientFixture(2, 'c', "Test", (short) 2, "Same"),
            testTransients);
    }

    /**
     * Asserts that if <code>lhs equals rhs 
     * then their hash codes MUST be identical.
     * 
     * @param lhs The Left-Hand-Side of the equals test
     * @param rhs The Right-Hand-Side of the equals test
     * @param testTransients whether to test transient fields
     */
    private void assertEqualsAndHashCodeContract(final Object lhs, final Object rhs, final boolean testTransients) {
        if (EqualsBuilder.reflectionEquals(lhs, rhs, testTransients)) {
            // test a couple of times for consistency.
            assertEquals(HashCodeBuilder.reflectionHashCode(lhs, testTransients), HashCodeBuilder.reflectionHashCode(rhs, testTransients));
            assertEquals(HashCodeBuilder.reflectionHashCode(lhs, testTransients), HashCodeBuilder.reflectionHashCode(rhs, testTransients));
            assertEquals(HashCodeBuilder.reflectionHashCode(lhs, testTransients), HashCodeBuilder.reflectionHashCode(rhs, testTransients));
        }
    }

    static class TestFixture {
        int i;
        char c;
        String string;
        short s;

        TestFixture(final int i, final char c, final String string, final short s) {
            this.i = i;
            this.c = c;
            this.string = string;
            this.s = s;
        }
    }

    static class SubTestFixture extends TestFixture {
        transient String tString;

        SubTestFixture(final int i, final char c, final String string, final short s, final String tString) {
            super(i, c, string, s);
            this.tString = tString;
        }
    }

    static class AllTransientFixture {
        transient int i;
        transient char c;
        transient String string;
        transient short s;

        AllTransientFixture(final int i, final char c, final String string, final short s) {
            this.i = i;
            this.c = c;
            this.string = string;
            this.s = s;
        }
    }

    static class SubAllTransientFixture extends AllTransientFixture {
        transient String tString;

        SubAllTransientFixture(final int i, final char c, final String string, final short s, final String tString) {
            super(i, c, string, s);
            this.tString = tString;
        }
    }


}

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