=== modified file 'dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/ExpressionUtils.java'
--- dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/ExpressionUtils.java	2015-04-29 11:33:31 +0000
+++ dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/ExpressionUtils.java	2015-04-29 11:38:15 +0000
@@ -48,6 +48,14 @@
         JEXL.setSilent( false );
     }
     
+    /**
+     * Evaluates the given expression. The given variables will be substituted 
+     * in the expression.
+     * 
+     * @param expression the expression.
+     * @param vars the variables, can be null.
+     * @return the result of the evaluation.
+     */
     public static Object evaluate( String expression, Map<String, Object> vars )
     {
         Expression exp = JEXL.createExpression( expression );
@@ -56,7 +64,15 @@
                 
         return exp.evaluate( context );
     }
-    
+
+    /**
+     * Evaluates the given expression to true or false. The given variables will 
+     * be substituted in the expression.
+     * 
+     * @param expression the expression.
+     * @param vars the variables, can be null.
+     * @return true or false.
+     */
     public static boolean isTrue( String expression, Map<String, Object> vars )
     {
         Boolean result = (Boolean) evaluate( expression, vars );