001/**
002 * Copyright 2005-2014 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
027 * {@link Constrainable}.
028 * This definition must also implement the interface {@link Constraint}, or a ClassCastException will be thrown.
029 *
030 * An example is {@link LengthConstrainable}, where members of the definition itself need to be made available to the
031 * ConstraintProcessor.
032 *
033 * @param <T> constrainable type
034 * @author Kuali Rice Team (rice.collab@kuali.org)
035 */
036public class DefinitionConstraintResolver<T extends Constrainable> implements ConstraintResolver<T> {
037
038    @Override
039    public <C extends Constraint> List<C> resolve(T definition) throws ClassCastException {
040        if (definition instanceof Constraint) {
041            @SuppressWarnings("unchecked") C constraint = (C) definition;
042            return Collections.singletonList(constraint);
043        }
044        /*        else if(definiton instanceof InputField){
045            C constraint = (C)definition.get
046        }*/
047        throw new ClassCastException(
048                "DefinitionConstraintResolver can only be used for a definition that implements both Constraint and Constrainable, or derives from a class that does.");
049    }
050
051}