/*

  * Copyright 2006-2011 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.core.impl.persistence.dao;

 import org.apache.log4j.Logger;

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

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

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

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

 import org.kuali.rice.core.api.config.property.Config;

 import org.kuali.rice.core.api.config.property.ConfigContext;

 import org.kuali.rice.core.api.util.RiceConstants;

 import org.kuali.rice.core.framework.persistence.dao.GenericDao;

 import org.kuali.rice.core.framework.persistence.ojb.SuffixableQueryByCriteria;

 import org.kuali.rice.core.framework.persistence.platform.DatabasePlatform;

 import org.springframework.dao.DataAccessException;

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

 import java.util.Collection;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 /**

  * This class is the OJB implementation of the GenericDao interface. This

  * class was adapted from the Kuali Nervous System

  * (org.kuali.rice.krad.dao.impl.GenericDaoOjb).

  * 

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

  */

 public class GenericDaoOjb extends PersistenceBrokerDaoSupport implements GenericDao {

     private static final Logger LOG = Logger.getLogger(GenericDaoOjb.class);

     private boolean useSelectForUpdate = true;

     /**

      * @param selectForUpdate whether to use select for update to implement pessimistic locking (testing/debugging purposes only)

      */

     public void setUseSelectForUpdate(boolean useSelectForUpdate) {

         this.useSelectForUpdate = useSelectForUpdate;

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findById(Class, Object)

      */

     public Object findById(Class clazz, Object id) {

         return getPersistenceBrokerTemplate().getObjectById(clazz, id);

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findByPrimaryKey(java.lang.Class, java.util.Map)

      */

     public Object findByPrimaryKey(Class clazz, Map primaryKeys) {

         Criteria criteria = buildCriteria(primaryKeys);

         return getPersistenceBrokerTemplate().getObjectByQuery(QueryFactory.newQuery(clazz, criteria));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findByUniqueKey(java.lang.Class, java.util.Map)

      */

     public Object findByUniqueKey(Class clazz, Map uniqueKeys) {

         Criteria criteria = buildCriteria(uniqueKeys);

         return getPersistenceBrokerTemplate().getObjectByQuery(QueryFactory.newQuery(clazz, criteria));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findAll(java.lang.Class)

      */

     public Collection findAll(Class clazz) {

         return getPersistenceBrokerTemplate().getCollectionByQuery(QueryFactory.newQuery(clazz, (Criteria) null));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findAllOrderBy(java.lang.Class, java.lang.String, boolean)

      */

     public Collection findAllOrderBy(Class clazz, String sortField,

             boolean sortAscending) {

         QueryByCriteria queryByCriteria = new QueryByCriteria(clazz, (Criteria) null);

         if (sortAscending) {

             queryByCriteria.addOrderByAscending(sortField);

         } else {

             queryByCriteria.addOrderByDescending(sortField);

         }

         return getPersistenceBrokerTemplate().getCollectionByQuery(

                 queryByCriteria);

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatching(java.lang.Class, java.util.Map)

      */

     public Collection findMatching(Class clazz, Map fieldValues) {

         Criteria criteria = buildCriteria(fieldValues);

         return getPersistenceBrokerTemplate().getCollectionByQuery(QueryFactory.newQuery(clazz, criteria));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#countMatching(java.lang.Class, java.util.Map)

      */

     public int countMatching(Class clazz, Map fieldValues) {

         Criteria criteria = buildCriteria(fieldValues);

         return getPersistenceBrokerTemplate().getCount(QueryFactory.newQuery(clazz, criteria));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#countMatching(java.lang.Class, java.util.Map, java.util.Map)

      */

     public int countMatching(Class clazz, Map positiveFieldValues,

             Map negativeFieldValues) {

         Criteria criteria = buildCriteria(positiveFieldValues);

         Criteria negativeCriteria = buildNegativeCriteria(negativeFieldValues);

         criteria.addAndCriteria(negativeCriteria);

         return getPersistenceBrokerTemplate().getCount(QueryFactory.newQuery(clazz, criteria));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatchingOrderBy(java.lang.Class, java.util.Map, java.lang.String, boolean)

      */

     public Collection findMatchingOrderBy(Class clazz, Map fieldValues,

             String sortField, boolean sortAscending) {

         Criteria criteria = buildCriteria(fieldValues);

         QueryByCriteria queryByCriteria = new QueryByCriteria(clazz, criteria);

         if (sortAscending) {

             queryByCriteria.addOrderByAscending(sortField);

         } else {

             queryByCriteria.addOrderByDescending(sortField);

         }

         return getPersistenceBrokerTemplate().getCollectionByQuery(queryByCriteria);

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#save(java.lang.Object)

      */

     public void save(Object bo) throws DataAccessException {

         getPersistenceBrokerTemplate().store(bo);

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#save(java.util.List)

      */

     public void save(List businessObjects) throws DataAccessException {

         for (Iterator i = businessObjects.iterator(); i.hasNext();) {

             Object bo = i.next();

             getPersistenceBrokerTemplate().store(bo);

         }

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#delete(java.lang.Object)

      */

     public void delete(Object bo) {

         getPersistenceBrokerTemplate().delete(bo);

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#delete(java.util.List)

      */

     public void delete(List<Object> boList) {

         for (Object bo : boList) {

             getPersistenceBrokerTemplate().delete(bo);

         }

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#deleteMatching(java.lang.Class, java.util.Map)

      */

     public void deleteMatching(Class clazz, Map fieldValues) {

         Criteria criteria = buildCriteria(fieldValues);

         getPersistenceBrokerTemplate().deleteByQuery(QueryFactory.newQuery(clazz, criteria));

         // An ojb delete by query doesn't update the cache so we need to clear

         // the cache for everything to work property.

         // don't believe me? Read the source code to OJB

         getPersistenceBrokerTemplate().clearCache();

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#retrieve(java.lang.Object)

      */

     public Object retrieve(Object object) {

         return getPersistenceBrokerTemplate().getObjectByQuery(QueryFactory.newQueryByIdentity(object));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatchingByExample(java.lang.Object)

      */

     public Collection findMatchingByExample(Object object) {

         return getPersistenceBrokerTemplate().getCollectionByQuery(QueryFactory.newQueryByExample(object));

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatching(java.lang.Class, org.apache.ojb.broker.query.Criteria)

      */

     public Collection findMatching(Class clazz, Criteria criteria) {

         return findMatching(clazz, criteria, false, RiceConstants.NO_WAIT);

         /*return getPersistenceBrokerTemplate().getCollectionByQuery(

         QueryFactory.newQuery(clazz, criteria));*/

     }

     /**

      * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatching(Class, Criteria, boolean)

      */

     public Collection findMatching(Class clazz, Criteria criteria, boolean selectForUpdate, long wait) {

         Query query;

         if (selectForUpdate && !useSelectForUpdate) {

             LOG.warn("Pessimistic locking was requested but select for update is disabled");

         }

         if (selectForUpdate && useSelectForUpdate) {

             SuffixableQueryByCriteria q = new SuffixableQueryByCriteria(clazz, criteria);

             // XXX: hax

             Config config = ConfigContext.getCurrentContextConfig();

             DatabasePlatform platform = null;

                         try {

                                 platform = (DatabasePlatform) Class.forName(config.getProperty(Config.DATASOURCE_PLATFORM)).newInstance();

                         } catch (Exception e) {

                                 throw new RuntimeException(e.getMessage(), e);

                         }

             q.setQuerySuffix(" " + platform.getSelectForUpdateSuffix(wait));

             query = q;            

         } else {

             query = QueryFactory.newQuery(clazz, criteria);

         }

         return getPersistenceBrokerTemplate().getCollectionByQuery(query);

     }

     /**

      * This method will build out criteria in the key-value paradigm

      * (attribute-value).

      * 

      * @param fieldValues

      * @return

      */

     private Criteria buildCriteria(Map fieldValues) {

         Criteria criteria = new Criteria();

         for (Iterator i = fieldValues.entrySet().iterator(); i.hasNext();) {

             Map.Entry e = (Map.Entry) i.next();

             String key = (String) e.getKey();

             Object value = e.getValue();

             if (value instanceof Collection) {

                 criteria.addIn(key, (Collection) value);

             } else {

                 criteria.addEqualTo(key, value);

             }

         }

         return criteria;

     }

     /**

      * This method will build out criteria in the key-value paradigm

      * (attribute-value).

      * 

      * @param fieldValues

      * @return

      */

     private Criteria buildNegativeCriteria(Map negativeFieldValues) {

         Criteria criteria = new Criteria();

         for (Iterator i = negativeFieldValues.entrySet().iterator(); i.hasNext();) {

             Map.Entry e = (Map.Entry) i.next();

             String key = (String) e.getKey();

             Object value = e.getValue();

             if (value instanceof Collection) {

                 criteria.addNotIn(key, (Collection) value);

             } else {

                 criteria.addNotEqualTo(key, value);

             }

         }

         return criteria;

     }

         /**

          * This overridden method ...

          * 

          * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatching(java.lang.Class, org.kuali.rice.core.framework.persistence.jpa.criteria.Criteria)

          */

         @Override

         public Collection findMatching(Class clazz,

                         org.kuali.rice.core.framework.persistence.jpa.criteria.Criteria criteria) {

                 // TODO g1zhang - THIS METHOD NEEDS JAVADOCS

                 return null;

         }

         /**

          * This overridden method ...

          * 

          * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatching(java.lang.Class, org.kuali.rice.core.framework.persistence.jpa.criteria.Criteria, boolean, long)

          */

         @Override

         public Collection findMatching(Class clazz,

                         org.kuali.rice.core.framework.persistence.jpa.criteria.Criteria criteria,

                         boolean selectForUpdate, long wait) {

                 // TODO g1zhang - THIS METHOD NEEDS JAVADOCS

                 return null;

         }

         /**

          * This overridden method ...

          * 

          * @see org.kuali.rice.core.framework.persistence.dao.GenericDao#findMatching(java.lang.Class, java.util.Map, boolean, long)

          */

         @Override

         public Collection findMatching(Class clazz, Map criteria,

                         boolean selectForUpdate, long wait) {

                 LOG.info("*******************************calling GenericDaoOjb.findMatching(Class clazz, Map criteria, boolean selectForUpdate, long wait)");

                 Criteria c = buildCriteria(criteria);

                 return findMatching(clazz, c, selectForUpdate, wait);

         }

 }