| /* |
| * 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. |
| */ |
| @SuppressWarnings("ReturnValueIgnored") |
| 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); |
| } |
| } |
| } |