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1   /**
2    * Copyright 2005-2011 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.processor;
17  
18  import org.kuali.rice.core.api.util.RiceKeyConstants;
19  import org.kuali.rice.krad.datadictionary.exception.AttributeValidationException;
20  import org.kuali.rice.krad.datadictionary.validation.AttributeValueReader;
21  import org.kuali.rice.krad.datadictionary.validation.ErrorLevel;
22  import org.kuali.rice.krad.datadictionary.validation.ValidationUtils;
23  import org.kuali.rice.krad.datadictionary.validation.constraint.Constraint;
24  import org.kuali.rice.krad.datadictionary.validation.constraint.PrerequisiteConstraint;
25  import org.kuali.rice.krad.datadictionary.validation.result.ConstraintValidationResult;
26  
27  import java.util.Collection;
28  
29  /**
30   * 
31   * @author Kuali Rice Team (rice.collab@kuali.org) 
32   */
33  public abstract class BasePrerequisiteConstraintProcessor<C extends Constraint> extends MandatoryElementConstraintProcessor<C> {
34  	
35  	protected ConstraintValidationResult processPrerequisiteConstraint(PrerequisiteConstraint constraint, AttributeValueReader attributeValueReader) throws AttributeValidationException {
36  
37  		ConstraintValidationResult constraintValidationResult = new ConstraintValidationResult(getName());
38  		
39  		if (constraint == null) {
40  			constraintValidationResult.setStatus(ErrorLevel.NOCONSTRAINT);
41  			return constraintValidationResult;
42  		}
43  			
44  		
45      	// TODO: Does this code need to be able to look at more than just the other immediate members of the object? 
46          String attributeName = constraint.getPropertyName();
47          
48          if (ValidationUtils.isNullOrEmpty(attributeName)) {
49          	throw new AttributeValidationException("Prerequisite constraints must include the name of the attribute that is required");
50          }
51          
52          Object value = attributeValueReader.getValue(attributeName);
53  
54          boolean isSuccessful = true;
55  
56          if (value instanceof java.lang.String) {
57          	isSuccessful = ValidationUtils.hasText((String) value);
58          } else if (value instanceof Collection) {
59          	isSuccessful = (((Collection<?>) value).size() > 0);
60          } else {
61          	isSuccessful = (null != value) ? true : false;
62          }
63  
64          
65          
66          if (!isSuccessful) {        	
67          	String label = attributeValueReader.getLabel(attributeName); 
68          	if (label != null)
69          		attributeName = label;
70          	
71          	constraintValidationResult.setError(RiceKeyConstants.ERROR_REQUIRES_FIELD, attributeName);
72          } 
73          
74          return constraintValidationResult;
75      }
76  
77  }