/*

  * 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.krad.datadictionary.validation.processor;

 import org.kuali.rice.core.util.RiceKeyConstants;

 import org.kuali.rice.krad.datadictionary.exception.AttributeValidationException;

 import org.kuali.rice.krad.datadictionary.validation.AttributeValueReader;

 import org.kuali.rice.krad.datadictionary.validation.ErrorLevel;

 import org.kuali.rice.krad.datadictionary.validation.ValidationUtils;

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

 import org.kuali.rice.krad.datadictionary.validation.constraint.PrerequisiteConstraint;

 import org.kuali.rice.krad.datadictionary.validation.result.ConstraintValidationResult;

 import java.util.Collection;

 /**

  * 

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

  */

 public abstract class BasePrerequisiteConstraintProcessor<C extends Constraint> extends MandatoryElementConstraintProcessor<C> {

         protected ConstraintValidationResult processPrerequisiteConstraint(PrerequisiteConstraint constraint, AttributeValueReader attributeValueReader) throws AttributeValidationException {

                 ConstraintValidationResult constraintValidationResult = new ConstraintValidationResult(getName());

                 if (constraint == null) {

                         constraintValidationResult.setStatus(ErrorLevel.NOCONSTRAINT);

                         return constraintValidationResult;

                 }

             // TODO: Does this code need to be able to look at more than just the other immediate members of the object? 

         String attributeName = constraint.getAttributePath();

         if (ValidationUtils.isNullOrEmpty(attributeName)) {

                 throw new AttributeValidationException("Prerequisite constraints must include the name of the attribute that is required");

         }

         Object value = attributeValueReader.getValue(attributeName);

         boolean isSuccessful = true;

         if (value instanceof java.lang.String) {

                 isSuccessful = ValidationUtils.hasText((String) value);

         } else if (value instanceof Collection) {

                 isSuccessful = (((Collection<?>) value).size() > 0);

         } else {

                 isSuccessful = (null != value) ? true : false;

         }

         if (!isSuccessful) {                

                 String label = attributeValueReader.getLabel(attributeName); 

                 if (label != null)

                         attributeName = label;

                 constraintValidationResult.setError(RiceKeyConstants.ERROR_REQUIRES_FIELD, attributeName);

         } 

         return constraintValidationResult;

     }

 }