Find and replace all occurrences of the string : String replace « Data Type « Java

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Java » Data Type » String replace 




Find and replace all occurrences of the string
     

/*  
 * Copyright 2008-2010 the original author or authors 
 *
 * 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.
 */
//package org.kaleidofoundry.core.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;


/**
 * String Helper static method
 
 @author Jerome RADUGET
 */
public abstract class StringHelper {
     /**
      * Find and replace all occurrences of the string <br/>
      
      * <pre>
      * <b>Assertions :</b>
      * assertNull(StringHelper.replaceAll(null, null, null));
      * assertNull(StringHelper.replaceAll(null, &quot;a&quot;, &quot;b&quot;));
      * assertEquals(&quot;anullc&quot;, StringHelper.replaceAll(&quot;abc&quot;, &quot;b&quot;, null));
      * assertEquals(&quot;&quot;, StringHelper.replaceAll(&quot;&quot;, &quot;&quot;, &quot;&quot;));
      * assertEquals(&quot;foo&quot;, StringHelper.replaceAll(&quot;a&quot;, &quot;a&quot;, &quot;foo&quot;));
      * assertEquals(&quot;.foo&quot;, StringHelper.replaceAll(&quot;.a&quot;, &quot;a&quot;, &quot;foo&quot;));
      * assertEquals(&quot;foo.&quot;, StringHelper.replaceAll(&quot;a.&quot;, &quot;a&quot;, &quot;foo&quot;));
      * assertEquals(&quot;..foo...foo..foo&quot;, StringHelper.replaceAll(&quot;..a...a..a&quot;, &quot;a&quot;, &quot;foo&quot;));
      * assertEquals(&quot;foo...foo..foo.&quot;, StringHelper.replaceAll(&quot;ab...ab..ab.&quot;, &quot;ab&quot;, &quot;foo&quot;));
      * </pre>
      
      @param source source string
      @param findToken string to search for
      @param replaceToken string to replace found tokens with
      @return the modified string
      */
     public static String replaceAll(String source, final String findToken, final String replaceToken) {
    if (source == null) { return null}
    StringBuilder sb = null;
    int pos;
    do {
       if ((pos = source.indexOf(findToken)) 0) {
      break;
       }
       if (sb == null) {
      sb = new StringBuilder();
       }
       if (pos > 0) {
      sb.append(source.substring(0, pos));
       }
       sb.append(replaceToken);
       source = source.substring(pos + findToken.length());
    while (source.length() 0);

    if (sb == null) {
       return source;
    else {
       sb.append(source);
       return sb.toString();
    }
     }
}

   
    
    
    
    
  














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