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HSQLDB - Lightweight 100% Java SQL Database Engine
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/* Copyright (c) 2001-2019, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 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.
 *
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 * contributors may be used to endorse or promote products derived from this
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb.jdbc;

import java.sql.SQLException;
import java.sql.Savepoint;

/* $Id: JDBCSavepoint.java 5969 2019-04-27 14:59:54Z fredt $ */

// Revision 1.10  2006/07/12 12:38:22  boucherb
// - full synch up to Mustang b90

/**
 * The representation of a savepoint, which is a point within
 * the current transaction that can be referenced from the
 * Connection.rollback method. When a transaction
 * is rolled back to a savepoint all changes made after that
 * savepoint are undone.
 * 
 * Savepoints can be either named or unnamed. Unnamed savepoints
 * are identified by an ID generated by the underlying data source.
 *
 * 
 * 

 * HSQLDB-Specific Information:
 
 *
 * SQL 2003 standard does not support unnamed savepoints. However, this
 * feature is supported from version 2.0.

 *
 * If the connection is autoCommit, setting savepoints has no effect as any
 * such savepoint is cleared upon the execution of the first transactional
 * statement. 

 *
 * 
 * 
 *
 *
 * @author Campbell Burnet (campbell-burnet@users dot sourceforge.net)
 * @since JDK 1.4, HSQLDB 1.7.2
 */
public class JDBCSavepoint implements Savepoint {

    int            id;
    String         name;
    JDBCConnection connection;

    JDBCSavepoint(String name, JDBCConnection conn) throws SQLException {

        if (name == null) {
            throw JDBCUtil.nullArgument("name");
        }

        if (conn == null) {
            throw JDBCUtil.nullArgument("conn");
        }

        this.name       = name;
        this.id         = -1;
        this.connection = conn;
    }

    JDBCSavepoint(JDBCConnection conn) throws SQLException {

        if (conn == null) {
            throw JDBCUtil.nullArgument("conn");
        }

        this.id         = conn.getSavepointID();
        this.name       = "SYSTEM_SAVEPOINT_" + id;
        this.connection = conn;
    }

    /**
     * Retrieves the generated ID for the savepoint that this
     * Savepoint object represents.
     * @return the numeric ID of this savepoint
     * @exception SQLException if this is a named savepoint
     * @since 1.4
     */
    public int getSavepointId() throws SQLException {

        if (id != -1) {
            return id;
        }

        throw JDBCUtil.notSupported();
    }

    /**
     * Retrieves the name of the savepoint that this Savepoint
     * object represents.
     *
     * @return the name of this savepoint
     * @exception SQLException if this is an un-named savepoint
     * @since 1.4
     */
    public String getSavepointName() throws SQLException {

        if (id == -1) {
            return name;
        }

        throw JDBCUtil.notSupported();
    }

    public String toString() {
        return super.toString() + "[name=" + name + "]";
    }
}