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package org.apache.commons.lang.builder;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import junit.textui.TestRunner;

/**
 * Tests {@link org.apache.commons.lang.builder.HashCodeBuilder} and
 * {@link org.apache.commons.lang.builder.EqualsBuilderTest} to insure that equal
 * objects must have equal hash codes.
 * 
 * @author Gary Gregory
 * @version $Id: HashCodeBuilderAndEqualsBuilderTest.java,v 1.4 2003/08/18 02:22:26 bayard Exp $
 */
public class HashCodeBuilderAndEqualsBuilderTest extends TestCase {

    /**
     * Constructor for HashCodeBuilderAndEqualsBuilderTest.
     * @param name
     */
    public HashCodeBuilderAndEqualsBuilderTest(String name) {
        super(name);
    }

    public static void main(String[] args) {
        TestRunner.run(suite());
    }

    public static Test suite() {
        TestSuite suite = new TestSuite(HashCodeBuilderAndEqualsBuilderTest.class);
        suite.setName("HashCodeBuilderAndEqualsBuilder Tests");
        return suite;
    }

    protected void setUp() throws Exception {
        super.setUp();
    }

    protected void tearDown() throws Exception {
        super.tearDown();
    }

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

    public void testInteger(boolean testTransients) {
        Integer i1 = new Integer(12345);
        Integer i2 = new Integer(12345);
        assertEqualsAndHashCodeContract(i1, i2, testTransients);
    }

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

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

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

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

    public void testFixture(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</code> equals <code>rhs</code> 
     * 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 wether to test transient fields
     */
    public void assertEqualsAndHashCodeContract(Object lhs, Object rhs, 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(int i, char c, String string, short s) {
            this.i = i;
            this.c = c;
            this.string = string;
            this.s = s;
        }
    }

    static class SubTestFixture extends TestFixture {
        transient String tString;

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

    static class SubAllTransientFixture extends AllTransientFixture {
        transient String tString;

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


}