remotemodelrequesthandler.java

实现了一个基于j2me移动gps定位系统

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/*
 * $Id: RemoteModelRequestHandler.java 257 2008-07-17 11:56:07Z khanh.lnq $
 * $URL: https://jvnmobilegis.googlecode.com/svn/trunk/src/org/javavietnam/gis/client/midp/model/RemoteModelRequestHandler.java $
 * $Author: khanh.lnq $
 * $Revision: 257 $
 * $Date: 2008-07-17 18:56:07 +0700 (Thu, 17 Jul 2008) $
 *
 * ====================================================================
 *
 * 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.util.Vector;

import javax.microedition.lcdui.Image;

import org.javavietnam.gis.client.midp.util.ProgressObserver;
import org.javavietnam.gis.shared.midp.ApplicationException;
import org.javavietnam.gis.shared.midp.model.ModelException;
import org.javavietnam.gis.shared.midp.model.SearchFeatureParameter;
import org.javavietnam.gis.shared.midp.model.WMSRequestParameter;

/**
 * @author khanhlnq
 */
abstract public class RemoteModelRequestHandler implements RequestHandler {

    /**
     * @link aggregation
     */
    private RemoteModelRequestHandler nextHandler;
    private static ProgressObserver progressObserver;

    public RemoteModelRequestHandler(RemoteModelRequestHandler nextHandler) {
        this.nextHandler = nextHandler;
    }

    /**
     * @return Returns the nextHandler.
     * @uml.property name="nextHandler"
     */
    public RequestHandler getNextHandler() {
        return nextHandler;
    }

    public void init() throws ApplicationException {
        if (nextHandler != null) {
            nextHandler.init();
        }

    }

    public void destroy() throws ApplicationException {
        if (nextHandler != null) {
            nextHandler.destroy();
        }

    }

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

    static void updateProgress() throws ApplicationException {
        if (progressObserver != null) {
            if (!progressObserver.isStopped()) {
                progressObserver.updateProgress();

                return;
            }

            throw new ApplicationException(
                    MessageCodes.ERROR_OPERATION_INTERRUPTED);
        }
    }

    private RemoteModelRequestHandler getRemoteModelRequestHandler()
            throws ApplicationException {
        if (nextHandler != null) {
            return nextHandler;
        }

        throw new ApplicationException(MessageCodes.ERROR_BROKEN_HANDLER_CHAIN);
    }

    public Image getMapWMS(WMSRequestParameter requestParam, Vector layerList)
            throws ModelException, ApplicationException {
        return getRemoteModelRequestHandler()
                .getMapWMS(requestParam, layerList);
    }

    public byte[] getMapWMSAsBytes(WMSRequestParameter requestParam,
            Vector layerList) throws ModelException, ApplicationException {
        return getRemoteModelRequestHandler().getMapWMSAsBytes(requestParam,
                layerList);
    }

    public String checkUpdate(String updateURL) throws ModelException,
            ApplicationException {
        return getRemoteModelRequestHandler().checkUpdate(updateURL);
    }

    /*
     * public String findPathWMS(WMSRequestParameter requestParam) throws
     * ModelException, ApplicationException { return
     * getRemoteModelRequestHandler().findPathWMS(requestParam); }
     */

    public String searchFeature(SearchFeatureParameter searchParam)
            throws ModelException, ApplicationException {
        return getRemoteModelRequestHandler().searchFeature(searchParam);
    }

    public String getFeatureInfo(WMSRequestParameter requestParam,
            Vector layerList, String infoLayer) throws ModelException,
            ApplicationException {
        return getRemoteModelRequestHandler().getFeatureInfo(requestParam,
                layerList, infoLayer);
    }

    /*
     * public Image viewPathWMS(WMSRequestParameter requestParam) throws
     * ModelException, ApplicationException { return
     * getRemoteModelRequestHandler().viewPathWMS(requestParam); }
     */

    public String getCapabilitiesWMS(String serviceURL) throws ModelException,
            ApplicationException {
        return getRemoteModelRequestHandler().getCapabilitiesWMS(serviceURL);
    }

    public String getWwwAuthenticate() throws ApplicationException {
        return getRemoteModelRequestHandler().getWwwAuthenticate();
    }

    public void setCredentials(String credentials) throws ApplicationException {
        getRemoteModelRequestHandler().setCredentials(credentials);
    }

    public String getTotalData() throws ApplicationException {
        return getRemoteModelRequestHandler().getTotalData();
    }

}