A new StringUtil method (a rare occurance!): trim() which safely handles null.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2458 6335cc39-0255-0410-8fd6-9bcaacd3b74c

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

@@ -92,6 +92,14 @@ public class StringUtil
         return (value == null || value.trim().length() == 0);
     }
 
+    /**
+     * Calls {@link String#trim} on non-null values, returns null for null values.
+     */
+    public static String trim (String value)
+    {
+        return (value == null) ? null : value.trim();
+    }
+
     /**
      * @return the supplied string if it is non-null, "" if it is null.
      */