songapp.java

Java的面向对象数据库系统的源代码

package song;

// $Id: song.SongApp.java,v 1.1 2002/05/17 08:28:18 per_nyfelt Exp $


import org.ozoneDB.ExternalDatabase;

import java.util.Collection;
import java.util.Iterator;

/**
 * A simple test application to get a litle understanding of how to
 * use handles under ozone.
 *
 * @version $Revision: 1.1 $
 * @author James Stiefel
 */

public class SongApp {


    public static void main( String[] args ) throws Exception {

        if (args.length == 0) {
            printUsage();
            System.exit( 1 );
        }

        // create and open a new database connection
        ExternalDatabase db = ExternalDatabase.openDatabase( "ozonedb:remote://localhost:3333" );
        db.reloadClasses();
        System.out.println( "Connected ..." );

        SongServices.init(db);

        if (args[0].equals("AddSong" )) {
            String title = args[1];
            String author = args[2];
            String publisher = args[3];
            String copyright = args[4];

            addSong(title, author, publisher, copyright);

        } else if (args[0].equals("RemoveSong" )){
            String title = args[1];
            removeSong(title);

        } else if (args[0].equals("PrintSongByTitle" )){
            String title = args[1];
            printSongForTitle(title);

        } else if (args[0].equals("PrintSongByHandle" )){
            String handle = args[1];
            printSongForHandle(handle);

        } else if (args[0].equals("PrintAllSongs" )){
            printAllSongs();
        } else {

            printUsage();
        }

        SongServices.term();
        db.close();
    }

    private static void printUsage(){
        System.out.println( "usage: ojvm song.SongApp <action>");
        System.out.println( "where <action> is:");
        System.out.println( " AdddSong <title> <author> <publisher> <copyright>");
        System.out.println( " RemoveSong <title>");
        System.out.println( " PrintSongByTitle <title>");
        System.out.println( " PrintSongByHandle <handle>");
        System.out.println( " PrintAllSongs");
    }


    private static void addSong(String title, String author, String publisher, String copyright) throws Exception{
        Song song = SongServices.createSong(title);
        song.setAuthor(author);
        song.setPublisher(publisher);
        song.setCopyright(copyright);
        printSong(song);

    }
    private static void removeSong(String title){
        SongServices.deleteSong(title);
    }
    private static void printSongForTitle(String title){
        Song song = SongServices.songForTitle(title);
        printSong(song);
    }
    private static void printSongForHandle(String handle){
        Song song = SongServices.songForHandle(handle);
        printSong(song);
    }
    private static void printAllSongs(){
        Collection songs = SongServices.getAllSongs().getAllSongs().values();
        System.out.println(songs.size() + " songs in collection.");

        Iterator it = songs.iterator();
        Song song;
        while (it.hasNext()){
            song = (Song)it.next();
            printSong(song);
        }

    }

    private static void printSong(Song song) {
        if (song != null) {
            System.out.println( "song.Song <" +song.handle() + "> title: "
                    + song.getTitle () + " | by: "
                    + song.getAuthor() + " | published by: "
                    + song.getPublisher() + " | copyright: "
                    + song.getCopyright()
            );
        } else {
            System.out.println("printSong:  input song is null.");
        }
    }

}