Added a method for replacing text within a string.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@44 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/util/StringUtil.java

@@ -1,5 +1,5 @@
 //
-// $Id: StringUtil.java,v 1.2 2000/10/31 00:51:13 mdb Exp $
+// $Id: StringUtil.java,v 1.3 2001/02/13 19:54:43 mdb Exp $
 
 package com.samskivert.util;
 
@@ -16,6 +16,32 @@ public class StringUtil
 	return (value == null || value.trim().length() == 0);
     }
 
+    /**
+     * Returns a new string based on <code>source</code> with all
+     * instances of <code>before</code> replaced with <code>after</code>.
+     */
+    public static String replace (String source, String before, String after)
+    {
+	int pos = source.indexOf(before);
+	if (pos == -1) {
+	    return source;
+	}
+
+	StringBuffer sb = new StringBuffer(source.length() + 32);
+
+	int blength = before.length();
+	int start = 0;
+	while (pos != -1) {
+	    sb.append(source.substring(start, pos));
+	    sb.append(after);
+	    start = pos + blength;
+	    pos = source.indexOf(before, start);
+	}
+	sb.append(source.substring(start));
+
+	return sb.toString();
+    }
+
     /**
      * Converts the supplied object to a string. Normally this is
      * accomplished via the object's built in <code>toString()</code>