HSQLDB example source code file (ConnectionDialogCommon.java)

This example HSQLDB source code file (ConnectionDialogCommon.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - HSQLDB tags/keywords

connectionsetting, database, db2, engine, file, file, hashtable, hsql, hsql, io, ioexception, ioexception, reflection, string, string, throwable, util

The HSQLDB ConnectionDialogCommon.java source code

/* Copyright (c) 2001-2008, 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.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * 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.
 */


package org.hsqldb.util;

import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Constructor;
import java.util.Enumeration;
import java.util.Hashtable;

import org.hsqldb.lib.java.JavaSystem;

// sqlbob@users 20020407 - patch 1.7.0 - reengineering
// fredt@users - 20040508 - modified patch by lonbinder@users for saving settings
// weconsultants@users - 20041114 - patch 1.8.0 - Added MySQL Connector/J jbcDriver and granulated imports

/**
 * Common code in the Swing and AWT versions of ConnectionDialog
 *
 * New class based on Hypersonic original
 *
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @version 1.7.2
 * @since 1.7.0
 */
class ConnectionDialogCommon {

    private static String[][]       connTypes;
    private static final String[][] sJDBCTypes = {
        {
            "HSQL Database Engine In-Memory", "org.hsqldb.jdbcDriver",
            "jdbc:hsqldb:mem:."
        }, {
            "HSQL Database Engine Standalone", "org.hsqldb.jdbcDriver",
            "jdbc:hsqldb:file:\u00ABdatabase/path?\u00BB"
        }, {
            "HSQL Database Engine Server", "org.hsqldb.jdbcDriver",
            "jdbc:hsqldb:hsql://localhost/"
        }, {
            "HSQL Database Engine WebServer", "org.hsqldb.jdbcDriver",
            "jdbc:hsqldb:http://\u00ABhostname/?\u00BB"
        }, {
            "JDBC-ODBC Bridge from Sun", "sun.jdbc.odbc.JdbcOdbcDriver",
            "jdbc:odbc:\u00ABdatabase?\u00BB"
        }, {
            "Cloudscape RMI", "RmiJdbc.RJDriver",
            "jdbc:rmi://\u00ABhost?\u00BB:1099/jdbc:cloudscape:"
            + "\u00ABdatabase?\u00BB;create=true"
        }, {
            "IBM DB2", "COM.ibm.db2.jdbc.app.DB2Driver",
            "jdbc:db2:\u00ABdatabase?\u00BB"
        }, {
            "IBM DB2 (thin)", "COM.ibm.db2.jdbc.net.DB2Driver",
            "jdbc:db2://\u00ABhost?\u00BB:6789/\u00ABdatabase?\u00BB"
        }, {
            "Informix", "com.informix.jdbc.IfxDriver",
            "jdbc:informix-sqli://\u00ABhost?\u00BB:1533/\u00ABdatabase?\u00BB:"
            + "INFORMIXSERVER=\u00ABserver?\u00BB"
        }, {
            "InstantDb", "jdbc.idbDriver", "jdbc:idb:\u00ABdatabase?\u00BB.prp"
        }, {
            "MySQL Connector/J", "com.mysql.jdbc.Driver",
            "jdbc:mysql://\u00ABhost?\u00BB/\u00ABdatabase?\u00BB"
        }, {
            "MM.MySQL", "org.gjt.mm.mysql.Driver",
            "jdbc:mysql://\u00ABhost?\u00BB/\u00ABdatabase?\u00BB"
        }, {
            "Oracle", "oracle.jdbc.driver.OracleDriver",
            "jdbc:oracle:oci8:@\u00ABdatabase?\u00BB"
        }, {
            "Oracle (thin)", "oracle.jdbc.driver.OracleDriver",
            "jdbc:oracle:thin:@\u00ABhost?\u00BB:1521:\u00ABdatabase?\u00BB"
        }, {
            "PointBase", "com.pointbase.jdbc.jdbcUniversalDriver",
            "jdbc:pointbase://\u00ABhost?\u00BB/\u00ABdatabase?\u00BB"
        }, {
            "PostgreSQL", "org.postgresql.Driver",
            "jdbc:postgresql://\u00ABhost?\u00BB/\u00ABdatabase?\u00BB"
        }, {
            "PostgreSQL v6.5", "postgresql.Driver",
            "jdbc:postgresql://\u00ABhost?\u00BB/\u00ABdatabase?\u00BB"
        }
    };

    static String[][] getTypes() {

        return sJDBCTypes;
/*

        if (connTypes == null) {


            // Pluggable connection types:
            Vector plugTypes = new Vector();

            try {
                plugTypes = (Vector) Class.forName(
                    System.getProperty(
                        "org.hsqldb.util.ConnectionTypeClass")).newInstance();
            } catch (Exception e) {
                ;
            }

            connTypes =
                new String[(plugTypes.size() / 3) + sJDBCTypes.length][3];

            int i = 0;

            for (int j = 0; j < plugTypes.size(); i++) {
                connTypes[i]    = new String[3];
                connTypes[i][0] = plugTypes.elementAt(j++).toString();
                connTypes[i][1] = plugTypes.elementAt(j++).toString();
                connTypes[i][2] = plugTypes.elementAt(j++).toString();
            }

            for (int j = 0; j < sJDBCTypes.length; i++, j++) {
                connTypes[i]    = new String[3];
                connTypes[i][0] = sJDBCTypes[j][0];
                connTypes[i][1] = sJDBCTypes[j][1];
                connTypes[i][2] = sJDBCTypes[j][2];
            }
        }

        return (connTypes);
 */
    }

    private static final String fileName       = "hsqlprefs.dat";
    private static File         recentSettings = null;

    static synchronized Hashtable loadRecentConnectionSettings()
    throws IOException {

        Hashtable list = new Hashtable();

        try {
            if (recentSettings == null) {
                setHomeDir();

                if (homedir == null) {
                    return list;
                }

                recentSettings = new File(homedir, fileName);

                if (!recentSettings.exists()) {
                    JavaSystem.createNewFile(recentSettings);

                    return list;
                }
            }
        } catch (Throwable e) {
            return list;
        }

        FileInputStream   in        = null;
        ObjectInputStream objStream = null;

        try {
            in        = new FileInputStream(recentSettings);
            objStream = new ObjectInputStream(in);

            list.clear();

            while (true) {
                ConnectionSetting setting =
                    (ConnectionSetting) objStream.readObject();

                if (!emptySettingName.equals(setting.getName())) {
                    list.put(setting.getName(), setting);
                }
            }
        } catch (EOFException eof) {

            // reached end of file -- this is not clean but it works
        } catch (ClassNotFoundException cnfe) {
            throw (IOException) new IOException("Unrecognized class type "
                                                + cnfe.getMessage());
        } catch (ClassCastException cce) {
            throw (IOException) new IOException("Unrecognized class type "
                                                + cce.getMessage());
        } catch (Throwable t) {}
        finally {
            if (objStream != null) {
                objStream.close();
            }

            if (in != null) {
                in.close();
            }
        }

        return list;
    }

    static String emptySettingName = "Recent settings...";

    /**
     * Adds the new settings name if it does not nexist, or overwrites the old one.
     */
    static void addToRecentConnectionSettings(Hashtable settings,
            ConnectionSetting newSetting) throws IOException {
        settings.put(newSetting.getName(), newSetting);
        ConnectionDialogCommon.storeRecentConnectionSettings(settings);
    }

    /**
     * Here's a non-secure method of storing recent connection settings.
     *
     * @param settings ConnectionSetting[]
     * @throw IOException if something goes wrong while writing
     */
    private static void storeRecentConnectionSettings(Hashtable settings) {

        try {
            if (recentSettings == null) {
                setHomeDir();

                if (homedir == null) {
                    return;
                }

                recentSettings = new File(homedir, fileName);

                if (!recentSettings.exists()) {

//                    recentSettings.createNewFile();
                }
            }

            if (settings == null || settings.size() == 0) {
                return;
            }

            // setup a stream to a physical file on the filesystem
            FileOutputStream   out = new FileOutputStream(recentSettings);
            ObjectOutputStream objStream = new ObjectOutputStream(out);
            Enumeration        en        = settings.elements();

            while (en.hasMoreElements()) {
                objStream.writeObject(en.nextElement());
            }

            objStream.flush();
            objStream.close();
            out.close();
        } catch (Throwable t) {}
    }

    /**
     * Removes the recent connection settings file store.
     */
    static void deleteRecentConnectionSettings() {

        try {
            if (recentSettings == null) {
                setHomeDir();

                if (homedir == null) {
                    return;
                }

                recentSettings = new File(homedir, fileName);
            }

            if (!recentSettings.exists()) {
                recentSettings = null;

                return;
            }

            recentSettings.delete();

            recentSettings = null;
        } catch (Throwable t) {}
    }

    private static String homedir = null;

    public static void setHomeDir() {

//#ifdef JAVA2FULL
        if (homedir == null) {
            try {
                Class c =
                    Class.forName("sun.security.action.GetPropertyAction");
                Constructor constructor = c.getConstructor(new Class[]{
                    String.class });
                java.security.PrivilegedAction a =
                    (java.security.PrivilegedAction) constructor.newInstance(
                        new Object[]{ "user.home" });

                homedir =
                    (String) java.security.AccessController.doPrivileged(a);
            } catch (Exception e) {
                System.err.println(
                    "No access to home directory.  Continuing without...");
            }
        }

//#endif
    }
}