localmodel.java

实现了一个基于j2me移动gps定位系统

/*
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 * - 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:
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 * Sample Application', 'Java', 'Java'-based names, or the names of
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/*
 * $Id: LocalModel.java 140 2007-10-05 07:17:58Z khanhlnq $
 * $URL: https://jvnmobilegis.googlecode.com/svn/trunk/src/org/javavietnam/gis/client/midp/model/LocalModel.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 org.javavietnam.gis.client.midp.util.ProgressObserver;
import org.javavietnam.gis.shared.midp.ApplicationException;

/**
 * @author khanhlnq
 */
class LocalModel {

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

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

    /**
     * @param progressObserver
     *            the progressObserver to set
     * @uml.property name="progressObserver"
     */
    public void setProgressObserver(ProgressObserver progressObserver) {
        LocalModel.progressObserver = progressObserver;
    }

    public void init() throws ApplicationException {
    }

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

    /*
     * 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
     */
    /**
     * @return the preferences
     * @throws org.javavietnam.gis.shared.midp.ApplicationException
     * @uml.property name="preferences"
     */
    public Preferences getPreferences() throws ApplicationException {
        if (preferences == null) {
            IndexEntry indexEntry = rmsAdapter.getIndexEntry("*",
                    IndexEntry.TYPE_PREFERENCES, IndexEntry.MODE_ANY);

            if (indexEntry != null) {
                preferences = rmsAdapter.loadPreferences(indexEntry
                        .getRecordId());
            } else {
                preferences = new Preferences();

                int recordId = rmsAdapter.storePreferences(preferences, -1);

                indexEntry = new IndexEntry(recordId,
                        IndexEntry.TYPE_PREFERENCES, "*",
                        IndexEntry.MODE_PERSISTING);

                rmsAdapter.addIndexEntry(indexEntry);
            }
        }

        return preferences;
    }

    // public void setPreferences() throws ApplicationException {
    /**
     * @param preferences
     *            the preferences to set
     * @throws org.javavietnam.gis.shared.midp.ApplicationException
     * @uml.property name="preferences"
     */
    public void setPreferences(Preferences preferences)
            throws ApplicationException {
        this.preferences.copy(preferences);

        IndexEntry indexEntry = rmsAdapter.getIndexEntry("*",
                IndexEntry.TYPE_PREFERENCES, IndexEntry.MODE_ANY);
        int recordId = rmsAdapter.storePreferences(preferences,
                indexEntry != null ? indexEntry.getRecordId() : -1);

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

            rmsAdapter.addIndexEntry(indexEntry);
        }

    }

}