| /* |
| * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4120694 |
| * @summary Test new methods in StringBuffer |
| * @key randomness |
| */ |
| |
| import java.lang.*; |
| import java.util.*; |
| |
| public class SBBasher { |
| public static void main(String[] args) throws Exception { |
| SBBasher basher = new SBBasher(); |
| |
| for (int iterations=0; iterations<100; iterations++) { |
| String testString = basher.generateTestString(); |
| boolean result = basher.Test1(testString); |
| if (result == false) |
| throw new RuntimeException("Substring or replace failure."); |
| } |
| |
| for (int iterations=0; iterations<100; iterations++) { |
| String testString = basher.generateTestString(); |
| boolean result = basher.Test2(testString); |
| if (result == false) |
| throw new RuntimeException("Insert or delete failure."); |
| } |
| |
| for (int iterations=0; iterations<100; iterations++) { |
| String testString = basher.generateTestString(); |
| boolean result = basher.Test3(testString); |
| if (result == false) |
| throw new RuntimeException("Insert, delete or replace failure."); |
| } |
| |
| } |
| |
| private int getRandomIndex(int constraint1, int constraint2) { |
| int range = constraint2 - constraint1; |
| int x = generator.nextInt(); |
| return constraint1 + Math.abs(x % range); |
| } |
| |
| static Random generator = new Random(); |
| |
| private String generateTestString() { |
| StringBuffer aNewString = new StringBuffer(120); |
| int aNewLength = getRandomIndex(1,100); |
| for(int y=0; y<aNewLength; y++) { |
| int achar = generator.nextInt(); |
| char test = (char)(achar); |
| aNewString.append(test); |
| } |
| return aNewString.toString(); |
| } |
| |
| /** |
| * first test, get substring of a random string |
| * and replace same spot with same substring |
| * then check for equality with original |
| * this tests both substrings and the replace method |
| */ |
| private boolean Test1(String before) { |
| StringBuffer bashed = new StringBuffer(before); |
| String slice; |
| for (int i=0; i<100; i++) { |
| int startIndex = getRandomIndex(0, before.length()); |
| int endIndex = getRandomIndex(startIndex, before.length()); |
| if (endIndex < bashed.length()) { |
| slice = bashed.substring(startIndex, endIndex); |
| } |
| else { |
| slice = bashed.substring(startIndex); |
| } |
| bashed.replace(startIndex, endIndex, slice); |
| } |
| String after = bashed.toString(); |
| if (!before.equals(after)) |
| return false; |
| else |
| return true; |
| } |
| |
| /** |
| * second test, delete random section of string |
| * then insert same section back again |
| * then check for equality with original |
| * this tests both substrings, both deletes and insert method |
| */ |
| private boolean Test2(String before) { |
| StringBuffer bashed = new StringBuffer(before); |
| String slice; |
| for (int i=0; i<100; i++) { |
| int startIndex = getRandomIndex(0, before.length()); |
| int endIndex = getRandomIndex(startIndex, before.length()); |
| if (endIndex < bashed.length()) |
| slice = bashed.substring(startIndex, endIndex); |
| else |
| slice = bashed.substring(startIndex); |
| if (slice.length() == 1) |
| bashed.deleteCharAt(startIndex); |
| else |
| bashed.delete(startIndex, endIndex); |
| bashed.insert(startIndex, slice.toCharArray(), 0, slice.length()); |
| } |
| String after = bashed.toString(); |
| if (!before.equals(after)) |
| return false; |
| else |
| return true; |
| } |
| |
| /** |
| * Third test, clone string and make sure that the |
| * replace operation is equivalent to a delete followed |
| * by an insert with the equivalent arguments |
| * this tests replace, delete and insert |
| */ |
| private boolean Test3(String before) { |
| StringBuffer bashed1 = new StringBuffer(before); |
| StringBuffer bashed2 = new StringBuffer(before); |
| int startIndex = getRandomIndex(0, bashed1.length()); |
| int endIndex = getRandomIndex(startIndex, bashed2.length()); |
| |
| String insertString = generateTestString(); |
| |
| bashed1.delete(startIndex, endIndex); |
| bashed1.insert(startIndex, insertString); |
| bashed2.replace(startIndex, endIndex, insertString); |
| |
| String result1 = bashed1.toString(); |
| String result2 = bashed2.toString(); |
| if (!result1.equals(result2)) |
| return false; |
| else |
| return true; |
| } |
| |
| } |