Initial checkin of directory structure and source code of the java Activity

[privoxy.git] / src / java / org / privoxy / activityconsole / StringUtil.java

diff --git a/src/java/org/privoxy/activityconsole/StringUtil.java b/src/java/org/privoxy/activityconsole/StringUtil.java
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+/*********************************************************************
+ *
+ * File        :  $Source$
+ *
+ * Purpose     :  Utility string functions.
+ *
+ * Copyright   :  Written by and Copyright (C) 2003 the SourceForge
+ *                Privoxy team. http://www.privoxy.org/
+ *
+ *                Based on the Internet Junkbuster originally written
+ *                by and Copyright (C) 1997 Anonymous Coders and
+ *                Junkbusters Corporation.  http://www.junkbusters.com
+ *
+ *                This program is free software; you can redistribute it
+ *                and/or modify it under the terms of the GNU General
+ *                Public License as published by the Free Software
+ *                Foundation; either version 2 of the License, or (at
+ *                your option) any later version.
+ *
+ *                This program 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 for more details.
+ *
+ *                The GNU General Public License should be included with
+ *                this file.  If not, you can view it at
+ *                http://www.gnu.org/copyleft/gpl.html
+ *                or write to the Free Software Foundation, Inc., 59
+ *                Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * Revisions   :
+ *    $Log$
+ *********************************************************************/
+
+package org.privoxy.activityconsole;
+
+/** 
+ * Utility string functions.
+ * @author Last Modified By: $Author$
+ * @version $Rev$-$Date$$State$
+ */
+class StringUtil
+{
+  private static final String
+    COPYRIGHT = org.privoxy.activityconsole.Copyright.COPYRIGHT;
+
+  /****************************************************************************
+  * This method replaces the preValue with the postValue in the originalString.
+  *
+  * @param originalString the string to have replacements
+  * @param preValue The substring value that the string currently contains
+  * @param postValue The substring value to replace the preValue
+  * @param recursive true if replacements should occur recursively
+  *
+  * @return String representing the substituted value(s)
+  ****************************************************************************/
+  public static final String replaceSubstring( String originalString
+                                               , String preValue
+                                               , String postValue
+                                               , boolean recursive
+                                             )
+  {
+    String finalString = originalString;
+    int previousFind = originalString.length();
+
+    int index = originalString.lastIndexOf(preValue);
+    while (index > -1        &&
+           index < previousFind
+          )
+    {
+      previousFind = index;
+
+      finalString = originalString.substring(0,index)
+                    + postValue
+                    + finalString.substring(index+preValue.length());
+
+      index = finalString.lastIndexOf(preValue,previousFind);
+      if (!recursive)
+      {
+        if (index == previousFind)
+          previousFind--;
+        index = finalString.lastIndexOf(preValue,previousFind);
+      }
+    }
+
+    return finalString;
+  }
+
+  /****************************************************************************
+  * This method replaces the preValue with the postValue in the originalString.
+  *
+  * @param originalString the string to have replacements
+  * @param preValue The substring value that the string currently contains
+  * @param postValue The substring value to replace the preValue
+  *
+  * @return String representing the substituted value(s)
+  ****************************************************************************/
+  public static final String replaceSubstring( String originalString
+                                               , String preValue
+                                               , String postValue
+                                             )
+  {
+    return(replaceSubstring(originalString, preValue, postValue, false));
+  }
+}