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/*
 * Copyright 1996-2005 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package java.sql;

/**
 * The interface that every driver class must implement.
 * <P>The Java SQL framework allows for multiple database drivers.
 *
 * <P>Each driver should supply a class that implements
 * the Driver interface.
 *
 * <P>The DriverManager will try to load as many drivers as it can
 * find and then for any given connection request, it will ask each
 * driver in turn to try to connect to the target URL.
 *
 * <P>It is strongly recommended that each Driver class should be
 * small and standalone so that the Driver class can be loaded and
 * queried without bringing in vast quantities of supporting code.
 *
 * <P>When a Driver class is loaded, it should create an instance of
 * itself and register it with the DriverManager. This means that a
 * user can load and register a driver by calling
 * <pre>
 *   <code>Class.forName("foo.bah.Driver")</code>
 * </pre>
 *
 * @see DriverManager
 * @see Connection 
 */
public interface Driver {

    /**
     * Attempts to make a database connection to the given URL.
     * The driver should return "null" if it realizes it is the wrong kind
     * of driver to connect to the given URL.  This will be common, as when
     * the JDBC driver manager is asked to connect to a given URL it passes
     * the URL to each loaded driver in turn.
     *
     * <P>The driver should throw an <code>SQLException</code> if it is the right 
     * driver to connect to the given URL but has trouble connecting to
     * the database.
     *
     * <P>The <code>java.util.Properties</code> argument can be used to pass
     * arbitrary string tag/value pairs as connection arguments.
     * Normally at least "user" and "password" properties should be
     * included in the <code>Properties</code> object.
     *
     * @param url the URL of the database to which to connect
     * @param info a list of arbitrary string tag/value pairs as
     * connection arguments. Normally at least a "user" and
     * "password" property should be included.
     * @return a <code>Connection</code> object that represents a
     *         connection to the URL
     * @exception SQLException if a database access error occurs
     */
    Connection connect(String url, java.util.Properties info)
        throws SQLException;

    /**
     * Retrieves whether the driver thinks that it can open a connection
     * to the given URL.  Typically drivers will return <code>true</code> if they
     * understand the subprotocol specified in the URL and <code>false</code> if
     * they do not.
     *
     * @param url the URL of the database
     * @return <code>true</code> if this driver understands the given URL;
     *         <code>false</code> otherwise  
     * @exception SQLException if a database access error occurs
     */
    boolean acceptsURL(String url) throws SQLException;


    /**
     * Gets information about the possible properties for this driver.
     * <P>
     * The <code>getPropertyInfo</code> method is intended to allow a generic 
     * GUI tool to discover what properties it should prompt 
     * a human for in order to get 
     * enough information to connect to a database.  Note that depending on
     * the values the human has supplied so far, additional values may become
     * necessary, so it may be necessary to iterate though several calls
     * to the <code>getPropertyInfo</code> method.
     *
     * @param url the URL of the database to which to connect
     * @param info a proposed list of tag/value pairs that will be sent on
     *          connect open
     * @return an array of <code>DriverPropertyInfo</code> objects describing 
     *          possible properties.  This array may be an empty array if 
     *          no properties are required.
     * @exception SQLException if a database access error occurs
     */
    DriverPropertyInfo[] getPropertyInfo(String url, java.util.Properties info)
       throws SQLException;


    /**
     * Retrieves the driver's major version number. Initially this should be 1.
     *
     * @return this driver's major version number
     */
    int getMajorVersion();

    /**
     * Gets the driver's minor version number. Initially this should be 0.
     * @return this driver's minor version number
     */
    int getMinorVersion();


    /**
     * Reports whether this driver is a genuine JDBC
     * Compliant<sup><font size=-2>TM</font></sup> driver.
     * A driver may only report <code>true</code> here if it passes the JDBC
     * compliance tests; otherwise it is required to return <code>false</code>.
     * <P>
     * JDBC compliance requires full support for the JDBC API and full support
     * for SQL 92 Entry Level.  It is expected that JDBC compliant drivers will
     * be available for all the major commercial databases.
     * <P>
     * This method is not intended to encourage the development of non-JDBC
     * compliant drivers, but is a recognition of the fact that some vendors
     * are interested in using the JDBC API and framework for lightweight
     * databases that do not support full database functionality, or for
     * special databases such as document information retrieval where a SQL
     * implementation may not be feasible.
     * @return <code>true</code> if this driver is JDBC Compliant; <code>false</code>
     *         otherwise
     */
    boolean jdbcCompliant();
} 

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