001/**
002 * Copyright 2005-2016 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.rice.krad.datadictionary.validation.constraint.resolver;
017
018import org.kuali.rice.krad.datadictionary.validation.capability.Constrainable;
019import org.kuali.rice.krad.datadictionary.validation.capability.LengthConstrainable;
020import org.kuali.rice.krad.datadictionary.validation.constraint.Constraint;
021
022import java.util.Collections;
023import java.util.List;
024
025/**
026 * An object that returns the constrainable definition itself as a list for a definition implementing the capability {@link Constrainable}.
027 * This definition must also implement the interface {@link Constraint}, or a ClassCastException will be thrown. 
028 * 
029 * An example is {@link LengthConstrainable}, where members of the definition itself need to be made available to the ConstraintProcessor.  
030 * 
031 * @author Kuali Rice Team (rice.collab@kuali.org)
032 */
033public class DefinitionConstraintResolver<T extends Constrainable> implements ConstraintResolver<T> {
034
035        @Override
036        public <C extends Constraint> List<C> resolve(T definition) throws ClassCastException {
037                if (definition instanceof Constraint) {
038                        @SuppressWarnings("unchecked")
039                        C constraint = (C)definition;
040                        return Collections.singletonList(constraint);
041                }
042/*        else if(definiton instanceof InputField){
043            C constraint = (C)definition.get
044        }*/
045                throw new ClassCastException("DefinitionConstraintResolver can only be used for a definition that implements both Constraint and Constrainable, or derives from a class that does.");
046        }
047        
048}