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PatternTesting Tools (patterntesting-tools) is the container for tools around PatternTesting like the Ant extensions and Maven plugin.

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/* 
 *========================================================================
 * 
 * Copyright 2001-2004 Vincent Massol & Matt Smith.
 *
 * 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 orimplied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 *========================================================================
 */
package patterntesting.tool.aspectj;

/**
 * @author Matt Smith
 * 
 * @version $Id: StringUtil.java,v 1.1 2008/12/07 14:13:55 oboehm Exp $
 *
 */
public class StringUtil
{
   /**
    * Escapes reserved XML characters.
    *
    * @param theString the string to escape
    * @return the escaped string
    */
   public static String xmlEncode(String theString)
   {
       String newString;

       // It is important to replace the "&" first as the other replacements
       // also introduces "&" chars ...
       newString = replace(theString, '&', "&");

       newString = replace(newString, '<', "<");
       newString = replace(newString, '>', ">");
       newString = replace(newString, '\"', """);

       return newString;
   }

   /**
    * Replaces a character in a string by a substring.
    *
    * @param theBaseString the base string in which to perform replacements
    * @param theChar the char to look for
    * @param theNewString the string with which to replace the char
    * @return the string with replacements done or null if the input string
    *          was null
    */
   public static String replace(String theBaseString, char theChar, 
       String theNewString)
   {
       if (theBaseString == null)
       {
           return null;
       }

       final int len = theBaseString.length() - 1;
       int pos = -1;

       while ((pos = theBaseString.indexOf(theChar, pos + 1)) > -1)
       {
           if (pos == 0)
           {
               final String after = theBaseString.substring(1);

               theBaseString = theNewString + after;
           }
           else if (pos == len)
           {
               final String before = theBaseString.substring(0, pos);

               theBaseString = before + theNewString;
           }
           else
           {
               final String before = theBaseString.substring(0, pos);
               final String after = theBaseString.substring(pos + 1);

               theBaseString = before + theNewString + after;
           }
       }

       return theBaseString;
   }
}