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/*
* 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;
}
}
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