filesystembrowserui.java

实现了一个基于j2me移动gps定位系统

/*
 * $Id: FileSystemBrowserUI.java 291 2008-10-06 09:03:15Z khanh.lnq $
 * $URL: https://jvnmobilegis.googlecode.com/svn/trunk/src/org/javavietnam/gis/client/midp/ui/FileSystemBrowserUI.java $
 * $Author: khanh.lnq $
 * $Revision: 291 $
 * $Date: 2008-10-06 16:03:15 +0700 (Mon, 06 Oct 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: 1.0.3
 * @author: Binh Pham
 * @Date Created: 09 May 2008
 */
package org.javavietnam.gis.client.midp.ui;

import java.io.IOException;
import java.util.Enumeration;

import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;
import javax.microedition.io.file.FileSystemRegistry;
import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.List;

import org.javavietnam.gis.client.midp.model.MessageCodes;
import org.javavietnam.gis.shared.midp.ApplicationException;

public class FileSystemBrowserUI extends List implements CommandListener {

    /* special string denotes upper directory */
    public static final String UP_DIRECTORY = "..";

    /*
     * special string that denotes upper directory accessible by this browser.
     * this virtual directory contains all roots.
     */
    public static final String MEGA_ROOT = "/";

    /* separator string as defined by FC specification */
    public static final String SEP_STR = "/";

    /* separator character as defined by FC specification */
    public static final char SEP = '/';

    private UIController uiController;
    private FileConnection fileConnection;
    private String currPath;
    private Image dirIcon;
    private Image fileIcon;
    private Enumeration enumeration;
    private Command save;
    private Command saveAs;
    private Command back;

    public FileSystemBrowserUI(UIController uiController) {
        super(uiController.getString(UIConstants.FILE_SYSTEM), Choice.IMPLICIT);
        this.uiController = uiController;
        dirIcon = this.uiController.getImage(UIConstants.ICON_DIR);
        fileIcon = this.uiController.getImage(UIConstants.ICON_FILE);

        setCurrPath(MEGA_ROOT);

        save = new Command(uiController.getString(UIConstants.SAVE),
                Command.SCREEN, 2);
        saveAs = new Command(uiController.getString(UIConstants.SAVE_AS),
                Command.SCREEN, 3);
        back = new Command(uiController.getString(UIConstants.BACK),
                Command.BACK, 5);

        addCommand(back);
        uiController.setCommands(this);

        setCommandListener(this);
    }

    public void getCurrDir() throws IOException {
        if (MEGA_ROOT.equals(currPath)) {
            enumeration = FileSystemRegistry.listRoots();
            this.deleteAll();
        } else {
            fileConnection = (FileConnection) Connector
                    .open("file://localhost/" + currPath);
            enumeration = fileConnection.list();
            // not root - draw UP_DIRECTORY
            this.deleteAll();
            append(UP_DIRECTORY, dirIcon);
        }

        while (enumeration.hasMoreElements()) {
            String fileName = (String) enumeration.nextElement();

            if (fileName.charAt(fileName.length() - 1) == SEP) {
                // This is directory
                append(fileName, dirIcon);
            } else {
                // this is regular file
                append(fileName, fileIcon);
            }
        }

        // Do not allow creating files/directories beside root
        if (!currPath.equals(MEGA_ROOT)) {
            addCommand(save);
            addCommand(saveAs);
        } else {
            removeCommand(save);
            removeCommand(saveAs);
        }

        if (fileConnection != null) {
            fileConnection.close();
        }
    }

    public void commandAction(Command command, Displayable display) {
        String label = getString(getSelectedIndex());
        if (List.SELECT_COMMAND == command) {
            if (label.endsWith(SEP_STR) || label.endsWith(UP_DIRECTORY)) {
                uiController.browseFileSystemRequested(display);
            } else {
                uiController.saveMapToFileRequested(display);
            }
        }
        if (command == save) {
            if (label.endsWith(SEP_STR) || label.endsWith(UP_DIRECTORY)) {
                uiController
                        .showErrorAlert(
                                new ApplicationException(
                                        uiController
                                                .getMessage(MessageCodes.ERROR_CAN_NOT_SAVE_MAP_TO_DIR)),
                                display);
            } else {
                uiController.saveMapToFileRequested(display);
            }
        } else if (command == saveAs) {
            uiController.saveAsMapToFileRequested();
        } else if (command == back) {
            uiController.viewMapRequested();
        } else {
            uiController.commandAction(command, display);
        }
    }

    /**
     * @return the currDirName
     */
    public String getCurrPath() {
        return currPath;
    }

    /**
     * @param currDirName
     *            the currDirName to set
     */
    public void setCurrPath(String currPath) {
        this.currPath = currPath;
    }
}