implemented the system administrator function "Import User Accounts," allowing

a sysadmin to create mass quantities of user accounts automatically by
uploading an XML file

src/com/silverwrist/util/StringUtil.java

@@ -49,7 +49,7 @@ public class StringUtil
    * @return The SQL-encoded equivalent of <CODE>str</CODE>.  If <CODE>str</CODE> is
    *         <B><CODE>null</CODE></B>, returns <B><CODE>null</CODE></B>.
    */
-  public static String encodeStringSQL(String str)
+  public static final String encodeStringSQL(String str)
   {
     if (str==null)
       return null;  // safety feature
@@ -81,7 +81,7 @@ public class StringUtil
    * @return The HTML-encoded equivalent of <CODE>str</CODE>.  If <CODE>str</CODE> is
    *         <B><CODE>null</CODE></B>, returns <B><CODE>null</CODE></B>.
    */
-  public static String encodeHTML(String str)
+  public static final String encodeHTML(String str)
   {
     if (str==null)
       return null;  // safety feature
@@ -134,7 +134,7 @@ public class StringUtil
    * @return <B><CODE>true</CODE></B> if the given string is <B><CODE>null</CODE></B> or a string of
    *         length 0, <B><CODE>false</CODE></B> otherwise.
    */
-  public static boolean isStringEmpty(String s)
+  public static final boolean isStringEmpty(String s)
   {
     return ((s==null) || (s.length()==0));
 
@@ -157,7 +157,7 @@ public class StringUtil
    *                of the <CODE>find</CODE> string will be deleted.
    * @return The <CODE>base</CODE> string with all replacements made as detailed above.
    */
-  public static String replaceAllInstances(String base, String find, String replace)
+  public static final String replaceAllInstances(String base, String find, String replace)
   {
     if ((base==null) || isStringEmpty(find))
       return base;  // safety feature
@@ -204,7 +204,7 @@ public class StringUtil
    *             <CODE>base</CODE>.
    * @return The <CODE>base</CODE> string with all variable substitutions made as detailed above.
    */
-  public static String replaceAllVariables(String base, Map vars)
+  public static final String replaceAllVariables(String base, Map vars)
   {
     if ((base==null) || (vars==null) || (vars.size()==0))
       return base;  // safety feature
@@ -244,5 +244,39 @@ public class StringUtil
 
   } // end replaceAllVariables
 
+  public static final String join(Object[] arr, String separator)
+  {
+    StringBuffer buf = null;
+    for (int i=0; i<arr.length; i++)
+    { // put it all together
+      if (buf==null)
+	buf = new StringBuffer(arr[i].toString());
+      else
+	buf.append(separator).append(arr[i].toString());
+
+    } // end for
+
+    return (buf==null) ? null : buf.toString();
+
+  } // end join
+
+  public static final String join(List l, String separator)
+  {
+    StringBuffer buf = null;
+    Iterator it = l.iterator();
+    while (it.hasNext())
+    { // put it all together
+      Object o = it.next();
+      if (buf==null)
+	buf = new StringBuffer(o.toString());
+      else
+	buf.append(separator).append(o.toString());
+
+    } // end for
+
+    return (buf==null) ? null : buf.toString();
+
+  } // end join
+
 } // end class StringUtil