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    /*******************************************************************************
 * * Copyright 2012 Impetus Infotech.
 *  *
 *  * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
 *  *
 *  * 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 com.impetus.client.rdbms.query;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.impetus.client.rdbms.HibernateClient;
import com.impetus.kundera.client.Client;
import com.impetus.kundera.client.ClientBase;
import com.impetus.kundera.client.EnhanceEntity;
import com.impetus.kundera.metadata.MetadataUtils;
import com.impetus.kundera.metadata.model.ApplicationMetadata;
import com.impetus.kundera.metadata.model.EntityMetadata;
import com.impetus.kundera.metadata.model.KunderaMetadata;
import com.impetus.kundera.persistence.EntityReader;
import com.impetus.kundera.persistence.PersistenceDelegator;
import com.impetus.kundera.query.KunderaQuery;
import com.impetus.kundera.query.QueryHandlerException;
import com.impetus.kundera.query.QueryImpl;

/**
 * The Class RDBMSQuery.
 * 
 * @author vivek.mishra
 */
public class RDBMSQuery extends QueryImpl
{
    /** the log used by this class. */
    private static Logger log = LoggerFactory.getLogger(RDBMSQuery.class);

    /** The reader. */
    private EntityReader reader;

    /**
     * Instantiates a new rDBMS query.
     * 
     * @param query
     *            the query
     * @param kunderaQuery
     *            the kundera query
     * @param persistenceDelegator
     *            the persistence delegator
     * @param persistenceUnits
     *            the persistence units
     */
    public RDBMSQuery(String query, KunderaQuery kunderaQuery, PersistenceDelegator persistenceDelegator)
    {
        super(query, persistenceDelegator);
        this.kunderaQuery = kunderaQuery;
    }

    @Override
    protected List recursivelyPopulateEntities(EntityMetadata m, Client client)
    {
        // retrieve
        if (log.isDebugEnabled())
            log.debug("On handleAssociation() retrieve associations ");

        initializeReader();
        List ls = getReader().populateRelation(m, client,this.maxResult);

        return setRelationEntities(ls, client, m);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.impetus.kundera.query.QueryImpl#populateEntities(com.impetus.kundera
     * .metadata.model.EntityMetadata, com.impetus.kundera.client.Client)
     */
    protected List populateEntities(EntityMetadata m, Client client)
    {
        if (log.isDebugEnabled())
            log.debug("on start of fetching non associated entities");

        List result = new ArrayList();

        initializeReader();

        try
        {
            if (MetadataUtils.useSecondryIndex(((ClientBase) client).getClientMetadata()))
            {
                List relations = new ArrayList();
                List r = ((HibernateClient) client).find(
                        ((RDBMSEntityReader) getReader()).getSqlQueryFromJPA(m, relations, null), relations, m);
                result = new ArrayList(r.size());

                for (Object o : r)
                {
                    Class clazz = m.getEntityClazz();
                    if (!o.getClass().isAssignableFrom(m.getEntityClazz()))
                    {
                        o = ((Object[]) o)[0];
                    }
                    result.add(o);
                }
            }
            else
            {
                result = populateUsingLucene(m, client, result, null);
            }
        }
        catch (Exception e)
        {
            log.error("Error during query execution ", e);
            throw new QueryHandlerException(e);
        }
        return result;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.impetus.kundera.query.QueryImpl#getReader()
     */
    @Override
    protected EntityReader getReader()
    {
        if (reader == null)
        {
            reader = new RDBMSEntityReader(getLuceneQueryFromJPAQuery(), getJPAQuery());
        }
        return reader;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.impetus.kundera.query.QueryImpl#onExecuteUpdate()
     */
    @Override
    protected int onExecuteUpdate()
    {
        if (kunderaQuery.isDeleteUpdate())
        {
            List result = getResultList();
            return result != null ? result.size() : 0;
        }

        return 0;
    }

    /**
     * Initializes reader with conditions and filter in case for JPA/Named query
     * only!
     * 
     */
    private void initializeReader()
    {
        ApplicationMetadata appMetadata = KunderaMetadata.INSTANCE.getApplicationMetadata();

        if (!appMetadata.isNative(getJPAQuery()))
        {
            ((RDBMSEntityReader) getReader()).setConditions(getKunderaQuery().getFilterClauseQueue());

            ((RDBMSEntityReader) getReader()).setFilter(getKunderaQuery().getFilter());
        }
    }

    @Override
    public void close()
    {
        // TODO Auto-generated method stub
        
    }

    @Override
    public Iterator iterate()
    {
        // TODO Auto-generated method stub
        return null;
    }

}
    
    
    
    

    




    
    
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