seatingplan.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: SeatingPlan.java,v 1.2 2003/03/20 01:46:53 zull Exp $
 */
package com.sun.j2me.blueprints.smartticket.shared.midp.model;

import java.io.*;
import com.sun.j2me.blueprints.smartticket.shared.midp.ApplicationException;

public class SeatingPlan {
    public static final byte AVAILABLE = 0;
    public static final byte UNAVAILABLE = 1;
    public static final byte BOOKED = 2;
    public static final byte AISLE = 9;
    private byte[] seatMap;
    private int rowLength;

    public SeatingPlan(byte[] seatMap, int rowLength) {
        this.seatMap = seatMap;
        this.rowLength = rowLength;

        return;
    }

    public byte[] getSeatMap() {
        return seatMap;
    } 

    public int getRowCount() {
        return seatMap.length / rowLength;
    } 

    public int getRowLength() {
        return rowLength;
    } 

    public byte getStatusOf(int rowNumber, int seatNumber) {
        return seatMap[rowNumber * rowLength + seatNumber];
    } 

    public void setStatusOf(int rowNumber, int seatNumber, byte status) {
        seatMap[rowNumber * rowLength + seatNumber] = status;

        return;
    } 

    public int getBookedSeatsCount() {
        int bookedSeatCount = 0;

        for (int i = 0; i != seatMap.length; i++) {
            if (seatMap[i] == BOOKED) {
                bookedSeatCount++;
            } 
        } 

        return bookedSeatCount;
    } 

    public Seat[] getBookedSeats() {
        Seat[] bookedSeats = new Seat[getBookedSeatsCount()];
        int j = 0;

        for (int i = 0; i < seatMap.length; i++) {
            if (seatMap[i] == BOOKED) {
                bookedSeats[j++] = new Seat(i / rowLength, i % rowLength);
            } 
        } 

        return bookedSeats;
    } 

    public void serialize(DataOutputStream dataStream) 
            throws ApplicationException {
        try {
            dataStream.writeInt(seatMap.length);
            dataStream.write(seatMap, 0, seatMap.length);
            dataStream.writeInt(rowLength);

            return;
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } 
    } 

    public static SeatingPlan deserialize(DataInputStream dataStream) 
            throws ApplicationException {
        try {
            byte[] data = new byte[dataStream.readInt()];

            dataStream.readFully(data);

            return new SeatingPlan(data, dataStream.readInt());
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } 
    } 

    public String toString() {
        StringBuffer buf = new StringBuffer();

        for (int i = 0; i < seatMap.length; i++) {
            buf.append(String.valueOf(seatMap[i]));

            if ((i % rowLength) == (rowLength - 1)) {
                buf.append('\n');
            } 
        } 

        return buf.toString();
    } 

    public static class Seat {
        private int rowNumber;
        private int seatNumber;

        public Seat(int rowNumber, int seatNumber) {
            this.rowNumber = rowNumber;
            this.seatNumber = seatNumber;

            return;
        }

        private Seat() {}

        public int getRowNumber() {
            return rowNumber;
        } 

        public int getSeatNumber() {
            return seatNumber;
        } 

        public void serialize(DataOutputStream dataStream) 
                throws ApplicationException {
            try {
                dataStream.writeInt(rowNumber);
                dataStream.writeInt(seatNumber);

                return;
            } catch (IOException ioe) {
                throw new ApplicationException(ioe);
            } 
        } 

        public static SeatingPlan.Seat deserialize(DataInputStream dataStream) 
                throws ApplicationException {
            try {
                Seat seat = new Seat();

                seat.rowNumber = dataStream.readInt();
                seat.seatNumber = dataStream.readInt();

                return seat;
            } catch (IOException ioe) {
                throw new ApplicationException(ioe);
            } 
        } 

    }

}