src/commons/org/codehaus/groovy/grails/validation/metaclass/ConstraintsDynamicProperty.java

   1 /* Copyright 2004-2005 the original author or authors.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at
   6  *
   7  *      http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 package org.codehaus.groovy.grails.validation.metaclass;
  16
  17 import org.codehaus.groovy.grails.commons.GrailsApplication;
  18 import org.codehaus.groovy.grails.commons.GrailsDomainClass;
  19 import org.codehaus.groovy.grails.commons.DomainClassArtefactHandler;
  20 import org.codehaus.groovy.grails.commons.metaclass.AbstractDynamicProperty;
  21 /**
  22  * This is a dynamic property that instead of returning the closure sets a new proxy meta class for the scope
  23  * of the call and invokes the closure itself which builds up a list of ConstrainedProperty instances
  24  *
  25  * @author Graeme Rocher
  26  * @since 07-Nov-2005
  27  */
  28 public class ConstraintsDynamicProperty extends AbstractDynamicProperty {
  29         public static final String PROPERTY_NAME = "constraints";
  30
  31         private GrailsApplication application;
  32
  33         public ConstraintsDynamicProperty(GrailsApplication application) {
  34                 super(PROPERTY_NAME);
  35                 this.application = application;
  36         }
  37
  38         public Object get(Object object)  {
  39                 GrailsDomainClass domainClass = (GrailsDomainClass) application.getArtefact(DomainClassArtefactHandler.TYPE,
  40             object.getClass().getName());
  41                 return domainClass.getConstrainedProperties();
  42         }
  43
  44         public void set(Object object, Object newValue) {
  45                 throw new UnsupportedOperationException("Cannot set read-only property ["+PROPERTY_NAME+"]");
  46         }
  47
  48 }