package org.seasar.extension.jdbc.impl;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.seasar.extension.jdbc.ResultSetFactory;
import org.seasar.extension.jdbc.ResultSetHandler;
import org.seasar.extension.jdbc.SelectHandler;
import org.seasar.framework.exception.EmptyRuntimeException;
import org.seasar.framework.exception.SQLRuntimeException;
import org.seasar.framework.log.Logger;
import org.seasar.framework.util.ConnectionUtil;
import org.seasar.framework.util.ResultSetUtil;
import org.seasar.framework.util.StatementUtil;

/**
 * @author higa
 *  
 */
public class BasicSelectHandler extends BasicHandler implements SelectHandler {

	private static Logger logger_ = Logger.getLogger(BasicSelectHandler.class);

	private ResultSetFactory resultSetFactory_ = BasicResultSetFactory.INSTANCE;

	private ResultSetHandler resultSetHandler_;

	private int fetchSize_ = 100;

	private int maxRows_ = -1;

	public BasicSelectHandler() {
	}

	public BasicSelectHandler(DataSource dataSource, String sql,
			ResultSetHandler resultSetHandler) {

		this(dataSource, sql, resultSetHandler, BasicResultSetFactory.INSTANCE);
	}
	
	public BasicSelectHandler(DataSource dataSource, String sql,
			ResultSetHandler resultSetHandler,
			ResultSetFactory resultSetFactory) {

		setDataSource(dataSource);
		setSql(sql);
		setResultSetHandler(resultSetHandler);
		setResultSetFactory(resultSetFactory);
	}

	public ResultSetFactory getResultSetFactory() {
		return resultSetFactory_;
	}

	public void setResultSetFactory(ResultSetFactory resultSetFactory) {
		resultSetFactory_ = resultSetFactory;
	}

	public ResultSetHandler getResultSetHandler() {
		return resultSetHandler_;
	}

	public void setResultSetHandler(ResultSetHandler resultSetHandler) {
		resultSetHandler_ = resultSetHandler;
	}

	public int getFetchSize() {
		return fetchSize_;
	}

	public void setFetchSize(int fetchSize) {
		fetchSize_ = fetchSize;
	}

	public int getMaxRows() {
		return maxRows_;
	}

	public void setMaxRows(int maxRows) {
		maxRows_ = maxRows;
	}

	/**
	 * @see org.seasar.extension.jdbc.SelectHandler#execute(java.lang.Object[])
	 */
	public Object execute(Object[] args) throws SQLRuntimeException {
		if (logger_.isDebugEnabled()) {
			logger_.debug(getCompleteSql(args));
		}
		Connection con = getConnection();
		try {
			return execute(con, args);
		} catch (SQLException ex) {
			throw new SQLRuntimeException(ex);
		} finally {
			ConnectionUtil.close(con);
		}
	}

	protected Object execute(Connection connection, Object[] args) throws SQLException {
		PreparedStatement ps = null;
		try {
			ps = prepareStatement(connection);
			bindArgs(ps, args);
			return execute(ps);
		} finally {
			StatementUtil.close(ps);
		}
	}
	
	protected Object[] setup(Connection con, Object[] args) {
		return args;
	}

	protected PreparedStatement prepareStatement(Connection connection) {
		PreparedStatement ps = super.prepareStatement(connection);
		if (fetchSize_ > -1) {
			StatementUtil.setFetchSize(ps, fetchSize_);
		}
		if (maxRows_ > -1) {
			StatementUtil.setMaxRows(ps, maxRows_);
		}
		return ps;
	}

	protected Object execute(PreparedStatement ps) throws SQLException {
		if (resultSetHandler_ == null) {
			throw new EmptyRuntimeException("resultSetHandler");
		}
		ResultSet resultSet = null;
		try {
			resultSet = createResultSet(ps);
			return resultSetHandler_.handle(resultSet);
		} finally {
			ResultSetUtil.close(resultSet);
		}
	}

	protected void setupDatabaseMetaData(DatabaseMetaData dbMetaData) {
	}

	protected ResultSet createResultSet(PreparedStatement ps)
			throws SQLException {

		return resultSetFactory_.createResultSet(ps);
	}
}