/*
* Copyright 2009 Google Inc.
*
* 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.
*/
/*
* 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.
*
* INCLUDES MODIFICATIONS BY GOOGLE.
*/
/**
* author Elena Semukhina
*/
package com.google.gwt.emultest.java.math;
import com.google.gwt.emultest.java.util.EmulTestBase;
import java.math.BigInteger;
/**
* Class: java.math.BigInteger Method: hashCode().
*/
public class BigIntegerHashCodeTest extends EmulTestBase {
/**
* Test hash codes for equal objects.
*/
public void testEqualObjects() {
String value1 = "12378246728727834290276457386374882976782849";
String value2 = "12378246728727834290276457386374882976782849";
BigInteger aNumber1 = new BigInteger(value1);
BigInteger aNumber2 = new BigInteger(value2);
int code1 = aNumber1.hashCode();
int code2 = aNumber2.hashCode();
if (aNumber1.equals(aNumber2)) {
assertTrue("hash codes for equal objects are unequal", code1 == code2);
}
}
/**
* Test hash codes for the same object.
*/
public void testSameObject() {
String value1 = "12378246728727834290276457386374882976782849";
String value2 = "-5634562095872038262928728727834290276457386374882976782849";
BigInteger aNumber1 = new BigInteger(value1);
BigInteger aNumber2 = new BigInteger(value2);
int code1 = aNumber1.hashCode();
aNumber1.add(aNumber2).shiftLeft(125);
aNumber1.subtract(aNumber2).shiftRight(125);
aNumber1.multiply(aNumber2).toByteArray();
aNumber1.divide(aNumber2).bitLength();
aNumber1.gcd(aNumber2).pow(7);
int code2 = aNumber1.hashCode();
assertTrue("hash codes for the same object differ", code1 == code2);
}
/**
* Test hash codes for unequal objects. The codes are unequal.
*/
public void testUnequalObjectsUnequal() {
String value1 = "12378246728727834290276457386374882976782849";
String value2 = "-5634562095872038262928728727834290276457386374882976782849";
BigInteger aNumber1 = new BigInteger(value1);
BigInteger aNumber2 = new BigInteger(value2);
int code1 = aNumber1.hashCode();
int code2 = aNumber2.hashCode();
if (!aNumber1.equals(aNumber2)) {
assertTrue("hash codes for unequal objects are equal", code1 != code2);
}
}
}