/*
 * Copyright 2004-2007 IDCA. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 * 
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and
 *        the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 *        and the following disclaimer in the documentation and/or other materials provided with the
 *        distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY IDCA AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IDCA OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are those of the authors and
 * should not be interpreted as representing official policies, either expressed or implied, of IDCA.
 */

package com.idcanet.vasc.backends.jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.idcanet.vasc.core.AbstractVascBackend;
import com.idcanet.xtes.xpql.query.QueryParameterValue;

/**
 * 
 * @author Willem Cazander
 * @version 1.0 Sep 5, 2008
 */
public class JdbcXpqlVascBackend extends AbstractVascBackend  {

	private JdbcConnectionProvider jdbcConnectionProvider = null;
	
	private com.idcanet.xtes.xpql.query.Query query = null;
	
	/**
	 * @return the JdbcConnectionProvider
	 */
	public JdbcConnectionProvider getJdbcConnectionProvider() {
		return jdbcConnectionProvider;
	}

	/**
	 * @param JdbcConnectionProvider the JdbcConnectionProvider to set
	 */
	public void setJdbcConnectionProvider(JdbcConnectionProvider jdbcConnectionProvider) {
		this.jdbcConnectionProvider = jdbcConnectionProvider;
	}

	/**
	 * @see com.idcanet.vasc.core.VascBackend#execute()
	 */
	public List<Object> execute() throws Exception {
		Connection c = getJdbcConnectionProvider().getJdbcConnection();
		try {
			PreparedStatement q = c.prepareStatement(query.toPreparedSQL(query));
            
            List<QueryParameterValue> values = query.getOrderQueryParameterValues();
            int i = 0;
            for (QueryParameterValue value:values) {
            	q.setObject(i,value.getValue());          	
            	i++;
            }
            q.execute();
            ResultSet rs = q.getResultSet();
            
            List<Object> data = new ArrayList<Object>(100);
            do {
            	Map<String,Object> obj = new HashMap<String,Object>(10);
            	for (i=0;i<rs.getMetaData().getColumnCount();i++) {
            		obj.put(rs.getMetaData().getCatalogName(i), rs.getObject(i));
            	}
            	data.add(obj);
            } while (rs.next());
			return data;
        } finally {
            if (c!=null) {
            	c.close();
            }
        }
	}

	/**
	 * @see com.idcanet.vasc.core.VascBackend#merge(java.lang.Object)
	 */
	public Object merge(Object object) throws Exception {
		return object;
	}

	/**
	 * @see com.idcanet.vasc.core.VascBackend#persist(java.lang.Object)
	 */
	public void persist(Object object) throws Exception {	
	}
	
	/**
	 * @see com.idcanet.vasc.core.VascBackend#delete(java.lang.Object)
	 */
	public void delete(Object object) throws Exception {
	}
}