indexentry.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: IndexEntry.java,v 1.3 2003/03/18 01:14:03 zull Exp $
 */
package com.sun.j2me.blueprints.smartticket.client.midp.model;

import java.io.*;

public class IndexEntry {
    public static final int TYPE_ANY = -1;
    public static final int TYPE_THEATER = 0;
    public static final int TYPE_THEATER_SCHEDULE = 1;
    public static final int TYPE_MOVIE = 2;
    public static final int TYPE_MOVIE_RATING = 3;
    public static final int TYPE_ACCOUNT_INFO = 4;
    public static final int TYPE_PREFERENCES = 5;
    public static final int TYPE_SYNC_ANCHOR = 6;
    public static final int TYPE_RESOURCE_BUNDLE = 7;
    public static final int MODE_ANY = -1;
    public static final int MODE_PERSISTING = 0;
    public static final int MODE_CACHING = 1;
    private int type;
    private String key;
    private long expirationDate;
    private boolean marked;
    private int recordId;
    private int mode = MODE_CACHING;

    public IndexEntry(int recordId, int type, String key) {
        this(recordId, type, key, MODE_CACHING);

        return;
    }

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

        return;
    }

    private IndexEntry() {}

    public int getType() {
        return type;
    } 

    public String getKey() {
        return key;
    } 

    public long getExpirationDate() {
        return expirationDate;
    } 

    public void setExpirationDate(long expirationDate) {
        this.expirationDate = expirationDate;
    } 

    public boolean isMarked() {
        return marked;
    } 

    public void setMarked(boolean marked) {
        this.marked = marked;
    } 

    public int getRecordId() {
        return recordId;
    } 

    public int getMode() {
        return mode;
    } 

    public byte[] serialize() throws IOException {
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        DataOutputStream dataStream = new DataOutputStream(byteStream);

        dataStream.writeInt(type);
        dataStream.writeUTF(key);
        dataStream.writeInt(mode);
        dataStream.writeLong(expirationDate);
        dataStream.writeBoolean(marked);
        dataStream.writeInt(recordId);

        return byteStream.toByteArray();
    } 

    public static IndexEntry deserialize(byte[] data) throws IOException {
        ByteArrayInputStream byteStream = new ByteArrayInputStream(data);
        DataInputStream dataStream = new DataInputStream(byteStream);
        IndexEntry indexEntry = new IndexEntry();

        indexEntry.type = dataStream.readInt();
        indexEntry.key = dataStream.readUTF();
        indexEntry.mode = dataStream.readInt();
        indexEntry.expirationDate = dataStream.readLong();
        indexEntry.marked = dataStream.readBoolean();
        indexEntry.recordId = dataStream.readInt();

        return indexEntry;
    } 

    // Optimization to avoid deserializing and instantiating an IndexEntry when matching RMS records
    public static boolean matches(byte[] data, String key, int type, 
                                  int mode) throws IOException {
        ByteArrayInputStream byteStream = new ByteArrayInputStream(data);
        DataInputStream dataStream = new DataInputStream(byteStream);

        return (type == dataStream.readInt() || type == TYPE_ANY) 
               && (dataStream.readUTF().equals(key) || key == null) 
               && (mode == dataStream.readInt() || mode == MODE_ANY);
    } 

}