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1   /**
2    * Copyright 2005-2014 The Kuali Foundation
3    *
4    * Licensed under the Educational Community License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.opensource.org/licenses/ecl2.php
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.kuali.rice.krad.datadictionary.validation.constraint.resolver;
17  
18  import org.kuali.rice.krad.datadictionary.validation.capability.Constrainable;
19  import org.kuali.rice.krad.datadictionary.validation.capability.LengthConstrainable;
20  import org.kuali.rice.krad.datadictionary.validation.constraint.Constraint;
21  
22  import java.util.Collections;
23  import java.util.List;
24  
25  /**
26   * An object that returns the constrainable definition itself as a list for a definition implementing the capability {@link Constrainable}.
27   * This definition must also implement the interface {@link Constraint}, or a ClassCastException will be thrown. 
28   * 
29   * An example is {@link LengthConstrainable}, where members of the definition itself need to be made available to the ConstraintProcessor.  
30   * 
31   * @author Kuali Rice Team (rice.collab@kuali.org)
32   */
33  public class DefinitionConstraintResolver<T extends Constrainable> implements ConstraintResolver<T> {
34  
35  	@Override
36  	public <C extends Constraint> List<C> resolve(T definition) throws ClassCastException {
37  		if (definition instanceof Constraint) {
38  			@SuppressWarnings("unchecked")
39  			C constraint = (C)definition;
40  			return Collections.singletonList(constraint);
41  		}
42  /*        else if(definiton instanceof InputField){
43              C constraint = (C)definition.get
44          }*/
45  		throw new ClassCastException("DefinitionConstraintResolver can only be used for a definition that implements both Constraint and Constrainable, or derives from a class that does.");
46  	}
47  	
48  }