indexentry.java

实现了一个基于j2me移动gps定位系统

/*
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 * 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
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 * - files in JPEG format and having the ".jpg" extension
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 * Sample Application', 'Java', 'Java'-based names, or the names of
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 * this software without specific prior written permission.
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/*
 * $Id: IndexEntry.java 140 2007-10-05 07:17:58Z khanhlnq $
 * $URL: https://jvnmobilegis.googlecode.com/svn/trunk/src/org/javavietnam/gis/client/midp/model/IndexEntry.java $
 * $Author: khanhlnq $
 * $Revision: 140 $
 * $Date: 2007-10-05 14:17:58 +0700 (Fri, 05 Oct 2007) $
 *
 * ====================================================================
 *
 * Copyright (C) 2006-2007 by JVNGIS
 *
 * All copyright notices regarding JVNMobileGIS MUST remain
 * intact in the Java codes and resource files.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Support can be obtained from project homepage at:
 * http://code.google.com/p/jvnmobilegis/
 *
 * Correspondence and Marketing Questions can be sent to:
 * khanh.lnq AT gmail.com
 * 
 * @version: 1.0
 * @author: Khanh Le
 * @Date Created: 22 Jun 2007
 */

package org.javavietnam.gis.client.midp.model;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

/**
 * @author khanhlnq
 */
public class IndexEntry {

    private static final int TYPE_ANY = -1;
    public static final int TYPE_PREFERENCES = 5;
    public static final int MODE_ANY = -1;
    public static final int MODE_PERSISTING = 0;
    private static final int MODE_CACHING = 1;
    /**
     * @uml.property name="type"
     */
    private int type;
    /**
     * @uml.property name="key"
     */
    private String key;
    /**
     * @uml.property name="expirationDate"
     */
    private long expirationDate;
    /**
     * @uml.property name="marked"
     */
    private boolean marked;
    /**
     * @uml.property name="recordId"
     */
    private int recordId;
    /**
     * @uml.property name="mode"
     */
    private int mode = MODE_CACHING;

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

    }

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

    }

    private IndexEntry() {
    }

    /**
     * @return the type
     * @uml.property name="type"
     */
    public int getType() {
        return type;
    }

    /**
     * @return the key
     * @uml.property name="key"
     */
    public String getKey() {
        return key;
    }

    /**
     * @return the expirationDate
     * @uml.property name="expirationDate"
     */
    public long getExpirationDate() {
        return expirationDate;
    }

    /**
     * @param expirationDate
     *            the expirationDate to set
     * @uml.property name="expirationDate"
     */
    public void setExpirationDate(long expirationDate) {
        this.expirationDate = expirationDate;
    }

    /**
     * @return the marked
     * @uml.property name="marked"
     */
    public boolean isMarked() {
        return marked;
    }

    /**
     * @param marked
     *            the marked to set
     * @uml.property name="marked"
     */
    public void setMarked(boolean marked) {
        this.marked = marked;
    }

    /**
     * @return the recordId
     * @uml.property name="recordId"
     */
    public int getRecordId() {
        return recordId;
    }

    /**
     * @return the mode
     * @uml.property name="mode"
     */
    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);
    }

}