/*

  * Copyright 2007-2010 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (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/ecl2.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.impl;

 import java.util.List;

 import org.kuali.rice.krad.datadictionary.FieldOverride;

 /**

  * A Field Override used to replace list elements in a Data Dictionary bean. 

  * 

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

  * 

  */

 public class FieldOverrideForListElementReplaceImpl extends FieldOverrideForListElementBase implements FieldOverride {

         private Object replaceWith;

         public Object getReplaceWith() {

                 return replaceWith;

         }

         public void setReplaceWith(Object replaceAt) {

                 this.replaceWith = replaceAt;

         }

         protected void varifyConfig() {

                 if (replaceWith == null) {

                         throw new RuntimeException(

                                         "Configuration Error, Missing required replaceWith parameter....");

                 }

         }

         public Object performFieldOverride(Object bean, Object property) {

                 varifyConfig();

                 List oldList = (List) property;

                 int replacePos = getElementPositionInList(getElement(), oldList);

                 if (replacePos == -1) {

                         throw new RuntimeException(

                                         "Configuration Error, replace element could not be located.");

                 }

                 if (replacePos >= 0 && replacePos < oldList.size()) {

                         oldList.remove(replacePos);

                         oldList.add(replacePos, getReplaceWith());

                 }

                 return oldList;

         }

 }