filebrowser.java.svn-base

j2me mobile application for upload file to server.

/*
 * 
 * Copyright © 2007 Sun Microsystems, Inc. All rights reserved. Use is subject
 * to license terms.
 */
package org.celllife.clforms;

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

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.List;

import org.celllife.clforms.task.BrowseTask;
import org.celllife.clforms.task.IOTask;

/**
 * Demonstration MIDlet for File Connection API. This MIDlet implements simple
 * file browser for the filesystem available to the J2ME applications.
 * 
 */
public class FileBrowser extends MVCComponent {

	/* special string denotes upper directory */
	private 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 */
	private static final String SEP_STR = "/";

	public static final String SERVER_URL = "file://localhost/";

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

	private static String currDirName;

	private static Command view = new Command("View", Command.ITEM, 1);

	private static Command back = new Command("Back", Command.BACK, 2);

	private static Command cancel = new Command("Cancel", Command.EXIT, 3);

	private static Image dirIcon;

	private static Image fileIcon;

	private static Enumeration dirEnum;

	private static Displayable screen = null;

	public FileBrowser(Enumeration dirEnum) {
		FileBrowser.dirEnum = dirEnum;
	}

	public void initModel() {
		//#debug debug
		System.out.println("FB init model");
		
		currDirName = MEGA_ROOT;

		try {
			dirIcon = Image.createImage("/icons/dir.png");
		} catch (IOException e) {
			dirIcon = null;
		}

		try {
			fileIcon = Image.createImage("/icons/file.png");
		} catch (IOException e) {
			fileIcon = null;
		}
	}

	protected void createView() {
		//#debug debug
		System.out.println("FB create view");
		
		updateView();

		//		try {
		//			showCurrDir();
		//		} catch (SecurityException e) {
		//			Form form = new Form("Cannot access FileConnection");
		//			form
		//					.append(new StringItem(
		//							null,
		//							"You cannot run this MIDlet with the current permissions. "
		//									+ "Sign the MIDlet suite, or run it in a different security domain"));
		//			form.addCommand(cancel);
		//			form.setCommandListener(this);
		//			screen = form;
		//		} catch (Exception e) {
		//			e.printStackTrace();
		//		}
	}

	public void commandAction(Command c, Displayable d) {
		if (c == view) {
			List curr = (List) d;
			String currFile = curr.getString(curr.getSelectedIndex());
			if (currFile.endsWith(SEP_STR) || currFile.equals(UP_DIRECTORY)) {
				//#debug debug
				System.out.println("dir: " + currDirName + " - file: " + currFile);

				traverseDirectory(currFile);
			} else {
				IOTask t = new IOTask(SERVER_URL + currDirName + currFile, display, true);
				t.go();
				// Show file contents
				// selectFile(currFile);
			}

		} else if (c == back) {
			showScreen();
		} else if (c == cancel) {
			(new XFormScreen()).showScreen();
		}
	}

	/**
	 * Show file list in the current directory .
	 */
	protected void updateView() {
		screen = new List(currDirName, List.IMPLICIT);

		//#debug debug
		System.out.println("update: " + currDirName);

		if (!MEGA_ROOT.equals(currDirName)) {
			System.out.println("not root");
			((List) screen).append(UP_DIRECTORY, dirIcon);
		}

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

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

		((List) screen).setSelectCommand(view);
		screen.addCommand(cancel);

	}

	private void traverseDirectory(String fileName) {
		/*
		 * In case of directory just change the current directory and show it
		 */
		if (currDirName.equals(MEGA_ROOT)) {
			if (fileName.equals(UP_DIRECTORY)) {
				// can not go up from MEGA_ROOT
				return;
			}

			currDirName = fileName;
		} else if (fileName.equals(UP_DIRECTORY)) {
			// Go up one directory
			// TODO use setFileConnection when implemented
			int i = currDirName.lastIndexOf(SEP, currDirName.length() - 2);

			if (i != -1) {
				currDirName = currDirName.substring(0, i + 1);
			} else {
				currDirName = MEGA_ROOT;
			}
		} else {
			currDirName = currDirName + fileName;
		}

		//#debug debug
		System.out.println("Browse to: " + currDirName);
		
		BrowseTask b = new BrowseTask(currDirName, display);
		b.go();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.celllife.clforms.MVCComponent#getScreen()
	 */
	public Displayable getScreen() {
		return screen;
	}
}