/*

  * Copyright 2007-2009 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.kew.documentlink.dao.impl;

 import java.util.List;

 import org.kuali.rice.kew.documentlink.DocumentLink;

 import org.kuali.rice.kew.documentlink.dao.DocumentLinkDAO;

 import org.apache.ojb.broker.query.Criteria;

 import org.apache.ojb.broker.query.QueryByCriteria;

 import org.kuali.rice.kew.notes.Note;

 import org.springmodules.orm.ojb.support.PersistenceBrokerDaoSupport;

 /**

  * This is a description of what this class does - g1zhang don't forget to fill this in. 

  * 

  * @author Kuali Rice Team (kuali-rice@googlegroups.com)

  *

  */

 public class DocumentLinkDAOOjbImpl extends PersistenceBrokerDaoSupport implements DocumentLinkDAO{

         public void saveDocumentLink(DocumentLink link) {

                 if(getLinkedDocument(link) == null)

                         this.getPersistenceBrokerTemplate().store(link);          

                 //if we want a 2-way linked pair

                 DocumentLink rLink = DocumentLinkDaoUtil.reverseLink(link);

                 if(getLinkedDocument(rLink) == null)

                         this.getPersistenceBrokerTemplate().store(rLink);

         }

         public void deleteDocumentLink(DocumentLink link) {

                 deleteSingleLinkFromOrgnDoc(link);

                 deleteSingleLinkFromOrgnDoc(DocumentLinkDaoUtil.reverseLink(link));

         }

         //double delete style

         public void deleteDocmentLinksByDocId(Long docId){

                 List<DocumentLink> links = getLinkedDocumentsByDocId(docId);

                 for(DocumentLink link: links){

                         deleteDocumentLink(link);

                 }

         }

         /**

          * This overridden method ...

          * 

          * @see org.kuali.rice.kew.documentlink.dao.DocumentLinkDAO#getLinkedDocumentByDocId(java.lang.Long)

          */

         public List<DocumentLink> getLinkedDocumentsByDocId(Long docId) {

                 Criteria crit = new Criteria();

                 crit.addEqualTo("orgnDocId", docId);

                 QueryByCriteria query = new QueryByCriteria(DocumentLink.class, crit);

                 query.addOrderByAscending("orgnDocId");

                 return (List<DocumentLink>) this.getPersistenceBrokerTemplate().getCollectionByQuery(query);  

         }

         /**

          * This overridden method ...

          * 

          * @see org.kuali.rice.kew.documentlink.dao.DocumentLinkDAO#getLinkedDocument(org.kuali.rice.kew.documentlink.DocumentLink)

          */

         public DocumentLink getLinkedDocument(DocumentLink link) {

                 Criteria crit = new Criteria();

                 crit.addEqualTo("orgnDocId", link.getOrgnDocId());

                 crit.addEqualTo("destDocId", link.getDestDocId());

                 QueryByCriteria query = new QueryByCriteria(DocumentLink.class, crit);

                 query.addOrderByAscending("orgnDocId");

                 return (DocumentLink) this.getPersistenceBrokerTemplate().getObjectByQuery(query);  

         }

         private void deleteSingleLinkFromOrgnDoc(DocumentLink link){

                 Criteria crit = new Criteria();

                 crit.addEqualTo("orgnDocId", link.getOrgnDocId());

                 crit.addEqualTo("destDocId", link.getDestDocId());

                 this.getPersistenceBrokerTemplate().deleteByQuery(new QueryByCriteria(DocumentLink.class, crit));

         }

         public void deleteSingleLinksByOrgnDocId(Long docId){

                 Criteria crit = new Criteria();

                 crit.addEqualTo("orgnDocId", docId);

                 this.getPersistenceBrokerTemplate().deleteByQuery(new QueryByCriteria(DocumentLink.class, crit));

         }

 }