Added LIST constraint

- An optionally case-insensitive list of supported values
 - Supports any types that can be converted to String by our type-converter.
Simple parameter values for constraints must not be in a <value> element, just like Spring properties (sorry)
Constraint parameters of type java.util.List are now supported:
   <list>
      <value>
      <value>
   </list>


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2660 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/dictionary/constraint/AbstractConstraint.java

@@ -33,6 +33,22 @@ public abstract class AbstractConstraint implements Constraint
     public static final String ERR_PROP_NOT_SET = "d_dictionary.constraint.err.property_not_set";
     public static final String ERR_EVALUATE_EXCEPTION = "d_dictionary.constraint.err.evaluate_exception";
 
+    /**
+     * Check that the given value is not <tt>null</tt>.
+     * 
+     * @param name the name of the property
+     * @param value the value to check for <tt>null</tt>
+     * 
+     * @throws DictionaryException if the the property is null
+     */
+    protected void checkPropertyNotNull(String name, Object value)
+    {
+        if (value == null)
+        {
+            throw new DictionaryException(AbstractConstraint.ERR_PROP_NOT_SET, value);
+        }
+    }
+
     /**
      * @see #evaluateSingleValue(Object)
      * @see #evaluateCollection(Collection)