localmodel.java

这个范例程序演示了利用j2me技术开发无线服务器支持的应用。这是一个电影票订购程序

/*
 * Copyright 2001, 2002, 2003 Sun Microsystems, Inc. All Rights Reserved.
 * Except for any files in PNG format (which are marked with the filename
 * extension ".png"), GIF format (which are marked with the filename
 * extension ".gif"), or JPEG format (which are marked with the filename
 * extension ".jpg"), redistribution and use in source and binary forms,
 * with or without modification, are permitted provided that the
 * following conditions are met:
 * - Redistribution of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * - Redistribution 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.
 * You may compile, use, perform and display the following files with
 * original Java Smart Ticket Sample Application code obtained from Sun
 * Microsystems, Inc. only:
 * - files in PNG format and having the ".png" extension
 * - files in GIF format and having the ".gif" extension
 * - files in JPEG format and having the ".jpg" extension
 * You may not modify or redistribute .png, .gif, or .jpg files in any
 * form, in whole or in part, by any means without prior written
 * authorization from Sun Microsystems, Inc. and its licensors, if any.
 * Neither the name of Sun Microsystems, Inc., the 'Java Smart Ticket
 * Sample Application', 'Java', 'Java'-based names, or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or maintenance
 * of any nuclear facility.
 * $Id: LocalModel.java,v 1.14 2003/03/26 00:01:40 zull Exp $
 */
package com.sun.j2me.blueprints.smartticket.client.midp.model;

import java.util.*;
import com.sun.j2me.blueprints.smartticket.client.midp.util.ProgressObserver;
import com.sun.j2me.blueprints.smartticket.shared.midp.ApplicationException;
import com.sun.j2me.blueprints.smartticket.shared.midp.IndexedResourceBundle;
import com.sun.j2me.blueprints.smartticket.shared.midp.model.*;

public class LocalModel {

    /**
     * @link aggregation
     */
    private RMSAdapter rmsAdapter;
    private Preferences preferences = null;
    protected static ProgressObserver progressObserver;

    public LocalModel() throws ApplicationException {
        rmsAdapter = new RMSAdapter();
    }

    public static void setProgressObserver(ProgressObserver progressObserver) {
        progressObserver = progressObserver;
    } 

    public void init() throws ApplicationException {}

    public void destroy() throws ApplicationException {
        cleanup();
        rmsAdapter.closeRecordStores();
    } 

    public Theater[] getTheaters(String zipCode) throws ApplicationException {
        return getTheaters(zipCode, IndexEntry.MODE_ANY);
    } 

    public Theater[] getCachedTheaters(String zipCode) 
            throws ApplicationException {
        return getTheaters(zipCode, IndexEntry.MODE_CACHING);
    } 

    public Theater[] getPersistedTheaters(String zipCode) 
            throws ApplicationException {
        return getTheaters(zipCode, IndexEntry.MODE_PERSISTING);
    } 

    private Theater[] getTheaters(String zipCode, 
                                  int mode) throws ApplicationException {
        IndexEntry[] indexEntries = 
            rmsAdapter.getIndexEntries(IndexEntry.TYPE_THEATER, mode);
        Vector theaterVector = new Vector();

        for (int i = 0; i < indexEntries.length; i++) {
            Theater theater = 
                rmsAdapter.loadTheater(indexEntries[i].getRecordId());

            if (zipCode == null || theater.getZipCode().equals(zipCode)) {
                theaterVector.addElement(theater);
            } 
        } 

        Theater[] theaters = new Theater[theaterVector.size()];

        theaterVector.copyInto(theaters);

        return theaters;
    } 

    public void deleteTheater(String theaterKey) throws ApplicationException {
        IndexEntry indexEntry = rmsAdapter.getIndexEntry(theaterKey, 
                IndexEntry.TYPE_THEATER, IndexEntry.MODE_ANY);

        if (indexEntry != null) {
            rmsAdapter.deleteTheater(indexEntry.getRecordId());
            rmsAdapter.deleteIndexEntry(indexEntry.getKey(), 
                                        indexEntry.getType());
        } 

        indexEntry = 
            rmsAdapter.getIndexEntry(theaterKey, 
                                     IndexEntry.TYPE_THEATER_SCHEDULE, 
                                     IndexEntry.MODE_ANY);

        if (indexEntry != null) {
            rmsAdapter.deleteTheaterSchedule(indexEntry.getRecordId());
            rmsAdapter.deleteIndexEntry(indexEntry.getKey(), 
                                        indexEntry.getType());
        } 

        // Movies are to be removed (garbage collected) by an independent
        // thread using the cleanup method
        return;
    } 

    public void cleanup() throws ApplicationException {
        IndexEntry[] indexEntries = 
            rmsAdapter.getIndexEntries(IndexEntry.TYPE_THEATER_SCHEDULE, 
                                       IndexEntry.MODE_ANY);

        for (int i = 0; i < indexEntries.length; i++) {
            if (indexEntries[i].getMode() == IndexEntry.MODE_CACHING 
                    && indexEntries[i].getExpirationDate() 
                       < System.currentTimeMillis()) {
                // clean the cache entries
                deleteTheater(indexEntries[i].getKey());
            } else {
                // mark dependent movies as reachable from a theater schedule
                TheaterSchedule theaterSchedule = 
                    rmsAdapter.loadTheaterSchedule(indexEntries[i].getRecordId());
                TheaterSchedule.MovieSchedule[] movieSchedules = 
                    theaterSchedule.getMovieSchedules();

                for (int j = 0; j < movieSchedules.length; j++) {
                    Movie movie = movieSchedules[j].getMovie();
                    IndexEntry indexEntry = 
                        rmsAdapter.getIndexEntry(movie.getPrimaryKey(), 
                                                 IndexEntry.TYPE_MOVIE, 
                                                 IndexEntry.MODE_ANY);

                    if (indexEntry != null) {
                        indexEntry.setMarked(true);
                        rmsAdapter.addIndexEntry(indexEntry);
                    } 
                } 
            } 
        } 

        indexEntries = 
            rmsAdapter.getIndexEntries(IndexEntry.TYPE_MOVIE_RATING, 
                                       IndexEntry.MODE_ANY);

        for (int i = 0; i < indexEntries.length; i++) {
            MovieRating movieRating = 
                rmsAdapter.loadMovieRating(indexEntries[i].getRecordId());
            Movie movie = movieRating.getMovie();
            IndexEntry indexEntry = 
                rmsAdapter.getIndexEntry(movie.getPrimaryKey(), 
                                         IndexEntry.TYPE_MOVIE, 
                                         IndexEntry.MODE_ANY);

            if (indexEntry != null) {
                indexEntry.setMarked(true);
                rmsAdapter.addIndexEntry(indexEntry);
            } 
        } 

        indexEntries = rmsAdapter.getIndexEntries(IndexEntry.TYPE_MOVIE, 
                                                  IndexEntry.MODE_ANY);

        for (int i = 0; i < indexEntries.length; i++) {
            // delete dependent movies which are not reachable from any theater schedule
            if (indexEntries[i].isMarked()) {
                indexEntries[i].setMarked(false);
                rmsAdapter.addIndexEntry(indexEntries[i]);
            } else {
                rmsAdapter.deleteMovie(indexEntries[i].getRecordId());
                rmsAdapter.deleteIndexEntry(indexEntries[i].getKey(), 
                                            IndexEntry.TYPE_MOVIE);
            } 
        } 

        return;
    } 

    public AccountInfo getAccountInfo() throws ApplicationException {
        AccountInfo accountInfo = null;
        IndexEntry indexEntry = rmsAdapter.getIndexEntry("*", 
                IndexEntry.TYPE_ACCOUNT_INFO, IndexEntry.MODE_ANY);

        if (indexEntry != null) {
            accountInfo = 
                rmsAdapter.loadAccountInfo(indexEntry.getRecordId());
        } 

        return accountInfo;
    } 

    public void setAccountInfo(AccountInfo accountInfo) 
            throws ApplicationException {
        IndexEntry indexEntry = rmsAdapter.getIndexEntry("*", 
                IndexEntry.TYPE_ACCOUNT_INFO, IndexEntry.MODE_ANY);
        int recordId = rmsAdapter.storeAccountInfo(accountInfo, 
                                                   indexEntry != null 
                                                   ? indexEntry.getRecordId() 
                                                   : -1);

        if (indexEntry == null) {
            indexEntry = new IndexEntry(recordId, 
                                        IndexEntry.TYPE_ACCOUNT_INFO, "*", 
                                        IndexEntry.MODE_PERSISTING);

            rmsAdapter.addIndexEntry(indexEntry);
        } 

        return;
    } 

    /*
     * This is used as cache and is maintained up-to-date,
     * getting the preferences always returns the same instance,
     * setting new preferences does not replace this instance but updates the individual attributes/properties of this instance