/*
 * Created on: Dec 17, 2004
 * Author: Dibyendu Majumdar
 */
package com.ponl.framework.dao.ibatis;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import com.ibatis.sqlmap.engine.transaction.Transaction;
import com.ibatis.sqlmap.engine.transaction.TransactionException;

/**
 * <p>
 * SqlMapTransaction:
 * </p>
 * 
 * <pre>
 *   History:
 *   Dec 17, 2004 DM Created
 * </pre>
 * 
 * @author Dibyendu Majumdar
 * @version
 * @since TCA 3.0
 */
public class SqlMapTransaction implements Transaction {

    private DataSource dataSource;

    /**
     * Indicates whether we are part of a global transaction.
     */
    private boolean globalCommit;

    private Connection connection;

    public SqlMapTransaction(DataSource ds, boolean globalCommit)
            throws TransactionException {
        this.dataSource = ds;
        this.globalCommit = globalCommit;
        if (dataSource == null) {
            throw new TransactionException(
                    "JdbcTransaction initialization failed.  DataSource was null.");
        }
    }

    private void init() throws SQLException, TransactionException {
        connection = dataSource.getConnection();
        if (connection == null) {
            throw new TransactionException(
                    "JdbcTransaction could not start transaction.  Cause: The DataSource returned a null connection.");
        }
        if (connection.getAutoCommit()) {
            connection.setAutoCommit(false);
        }
    }

    public void commit() throws SQLException, TransactionException {
        if (!globalCommit && connection != null)
            connection.commit();
    }

    public void rollback() throws SQLException, TransactionException {
        if (!globalCommit && connection != null)
            connection.rollback();
    }

    public void close() throws SQLException, TransactionException {
        if (connection != null) {
            connection.close();
            connection = null;
        }
    }

    public Connection getConnection() throws SQLException, TransactionException {
        if (connection == null) {
            init();
        }
        return connection;
    }

}