/*

  * Copyright 2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 1.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl1.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kns.datadictionary.validation.constraint.resolver;

 import java.util.Collections;

 import java.util.List;

 import org.kuali.rice.kns.datadictionary.validation.capability.Constrainable;

 import org.kuali.rice.kns.datadictionary.validation.capability.LengthConstrainable;

 import org.kuali.rice.kns.datadictionary.validation.constraint.Constraint;

 /**

  * An object that returns the constrainable definition itself as a list for a definition implementing the capability {@link Constrainable}.

  * This definition must also implement the interface {@link Constraint}, or a ClassCastException will be thrown. 

  * 

  * An example is {@link LengthConstrainable}, where members of the definition itself need to be made available to the ConstraintProcessor.  

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class DefinitionConstraintResolver<T extends Constrainable> implements ConstraintResolver<T> {

         @Override

         public <C extends Constraint> List<C> resolve(T definition) throws ClassCastException {

                 if (definition instanceof Constraint) {

                         @SuppressWarnings("unchecked")

                         C constraint = (C)definition;

                         return Collections.singletonList(constraint);

                 }

                 throw new ClassCastException("DefinitionConstraintResolver can only be used for a definition that implements both Constraint and Constrainable, or derives from a class that does.");

         }

 }