rmsadapter.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: RMSAdapter.java,v 1.12 2003/03/26 22:22:08 zull Exp $
 */
package com.sun.j2me.blueprints.smartticket.client.midp.model;

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.*;
import java.io.*;
import javax.microedition.rms.*;

public class RMSAdapter {
    public static final String RECORD_STORE_INDEX = "INDEX";
    public static final String RECORD_STORE_REMOTE_DATA = "REMOTE_DATA";
    public static final String RECORD_STORE_LOCAL_DATA = "LOCAL_DATA";
    private RecordStore indexRecordStore;
    // Should we additionally keep an updated copy of IndexEntries (cf. listener)?
    private RecordStore remoteDataRecordStore;
    private RecordStore localDataRecordStore;

    /**
     * @link dependency
     */
    /* # IndexEntry lnkIndexEntry; */
    private static class IndexEntryFilter implements RecordFilter {
        private String key;
        private int type;
        private int mode;

        public IndexEntryFilter(String key, int type) {
            this(key, type, IndexEntry.MODE_ANY);
        }

        public IndexEntryFilter(String key, int type, int mode) {
            this.key = key;
            this.type = type;
            this.mode = mode;

            return;
        }

        public boolean matches(byte[] candidate) {
            try {
                return IndexEntry.matches(candidate, key, type, mode);
            } catch (IOException ioe) {
                ioe.printStackTrace();

                return false;
            } 
        } 

    }

    public RMSAdapter() throws ApplicationException {
        try {
            indexRecordStore = RecordStore.openRecordStore(RECORD_STORE_INDEX, 
                    true);
            remoteDataRecordStore = 
                RecordStore.openRecordStore(RECORD_STORE_REMOTE_DATA, true);
            localDataRecordStore = 
                RecordStore.openRecordStore(RECORD_STORE_LOCAL_DATA, true);

            return;
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    }

    public void closeRecordStores() throws ApplicationException {
        try {
            indexRecordStore.closeRecordStore();
            remoteDataRecordStore.closeRecordStore();
            localDataRecordStore.closeRecordStore();

            return;
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    public void addIndexEntry(IndexEntry indexEntry) 
            throws ApplicationException {
        try {
            byte[] data = indexEntry.serialize();

            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = 
                    indexRecordStore.enumerateRecords(new IndexEntryFilter(indexEntry.getKey(), indexEntry.getType()), 
                                                      null, false);

                if (records.hasNextElement()) {
                    indexRecordStore.setRecord(records.nextRecordId(), data, 
                                               0, data.length);
                } else {
                    indexRecordStore.addRecord(data, 0, data.length);
                } 
            } else {
                indexRecordStore.addRecord(data, 0, data.length);
            } 

            return;
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    public IndexEntry[] getIndexEntries(int type, int mode) 
            throws ApplicationException {
        try {
            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = 
                    indexRecordStore.enumerateRecords(new IndexEntryFilter(null, type, mode), 
                                                      null, false);
                IndexEntry[] indexEntries = 
                    new IndexEntry[records.numRecords()];

                for (int i = 0; i < indexEntries.length; i++) {
                    byte[] data = 
                        indexRecordStore.getRecord(records.nextRecordId());

                    indexEntries[i] = IndexEntry.deserialize(data);
                } 

                return indexEntries;
            } else {
                return new IndexEntry[0];
            } 
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    public IndexEntry getIndexEntry(String key, int type, 
                                    int mode) throws ApplicationException {
        try {
            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = 
                    indexRecordStore.enumerateRecords(new IndexEntryFilter(key, type, mode), 
                                                      null, false);

                if (records.hasNextElement()) {
                    byte[] data = 
                        indexRecordStore.getRecord(records.nextRecordId());

                    return IndexEntry.deserialize(data);
                } 
            } 

            return null;
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    public void deleteIndexEntry(String key, 
                                 int type) throws ApplicationException {
        try {
            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = 
                    indexRecordStore.enumerateRecords(new IndexEntryFilter(key, type), 
                                                      null, false);

                while (records.hasNextElement()) {
                    indexRecordStore.deleteRecord(records.nextRecordId());
                } 
            } 

            return;
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    private void delete(RecordStore recordStore, 
                        int recordId) throws ApplicationException {
        try {
            recordStore.deleteRecord(recordId);

            return;
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    public Theater loadTheater(int recordId) throws ApplicationException {
        try {
            byte[] data = remoteDataRecordStore.getRecord(recordId);

            return Theater.deserialize(new DataInputStream(new ByteArrayInputStream(data)));
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    public int storeTheater(Theater theater, 
                            int recordId) throws ApplicationException {
        try {
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            DataOutputStream dataStream = new DataOutputStream(stream);

            theater.serialize(dataStream);
            dataStream.flush();

            if (recordId > 0) {
                remoteDataRecordStore.setRecord(recordId, 
                                                stream.toByteArray(), 0, 
                                                stream.size());
            } else {
                recordId = 
                    remoteDataRecordStore.addRecord(stream.toByteArray(), 0, 
                                                    stream.size());
            } 

            return recordId;
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        } 
    } 

    public void deleteTheater(int recordId) throws ApplicationException {
        delete(remoteDataRecordStore, recordId);

        return;
    } 

    public TheaterSchedule loadTheaterSchedule(int recordId) 
            throws ApplicationException {
        try {
            byte[] data = remoteDataRecordStore.getRecord(recordId);

            return TheaterSchedule.deserialize(new DataInputStream(new ByteArrayInputStream(data)));
        } catch (RecordStoreException rse) {
            rse.printStackTrace();