translatorscreen.java

J2ME MIDP_Example_Applications

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE
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// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR
// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE
// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
// Nokia and Nokia Connecting People are registered trademarks of Nokia
// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
//
// A non-exclusive, non-transferable, worldwide, limited license is hereby
// granted to the Licensee to download, print, reproduce and modify the
// source code. The licensee has the right to market, sell, distribute and
// make available the source code in original or modified form only when
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import java.io.*;
import java.util.*;

import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;

import org.ksoap.*;
import org.kxml.*;
import org.kxml.io.*;
import org.kxml.parser.*;


class TranslatorScreen
     extends Form
     implements Runnable,
                CommandListener,
                HttpPosterListener
{   
    private final static String CHARSET = "UTF-8";
    private final static String CONTENT_TYPE =
        "text/xml; charset=\"" + CHARSET + "\"";
    private final static int TICK_TIME_MILLIS = 300;
    private final static int TEXT_RECORD = 1;

    private final TranslatorMIDlet midlet;
    private final Command exitCommand;
    private final Command translateCommand;
    private final Command settingsCommand;
    private final Command cancelCommand;
    private final ImageItem activityIndicator;
    private final Image active0;
    private final Image active1;
    private final TextField inputTextField;
    private final StringItem outputStringItem;

    private String inputLocale = SettingsScreen.DEFAULT_INPUT_LOCALE;
    private String outputLocale = SettingsScreen.DEFAULT_OUTPUT_LOCALE;

    private volatile boolean aborting = false;
    private volatile boolean doAnimation = false;
    
    private Thread animationThread = null;
    private int progressCount = 0;


    TranslatorScreen(TranslatorMIDlet midlet)
    {
        super(null);
        this.setTitle(titleString());
        this.midlet = midlet;       

        // Initialize progress meter
        active0 = TranslatorMIDlet.makeImage("/active0.png");
        active1 = TranslatorMIDlet.makeImage("/active1.png");
        int anchor = (ImageItem.LAYOUT_LEFT |
                      ImageItem.LAYOUT_NEWLINE_AFTER);
        activityIndicator = new ImageItem("Translating",
                                          active0,
                                          anchor,
                                          "");

        // TextField for entering Input
        inputTextField = new TextField("Input text",
                                       "", // default input text
                                       128,
                                       TextField.ANY);
        append(inputTextField);

        // StringItem for translated Output inputTextField
        outputStringItem = new StringItem("", "");
        append(outputStringItem);

        // Screen commands
        exitCommand = new Command("Exit", Command.EXIT, 1);
        settingsCommand = new Command("Settings", Command.SCREEN, 1);
        translateCommand = new Command("Translate", Command.SCREEN, 2);
        cancelCommand = new Command("Cancel", Command.STOP, 2);
        addCommand(translateCommand);
        addCommand(settingsCommand);
        addCommand(exitCommand);
        setCommandListener(this);
    }


    private String titleString()
    {
        return inputLocale + " to " + outputLocale + " Translator";
    }


    void setLocales(String inputLocale, String outputLocale)
    {
        this.inputLocale = inputLocale;
        this.outputLocale = outputLocale;

        clearTranslation();

        // update screen's title
        setTitle(titleString());
    }
    
    
    private void clearTranslation()
    {
        // clear old translation text

        outputStringItem.setLabel("");
        outputStringItem.setText("");
    }


    // Runnable: this method is used by our thread
    public void run()
    {
        while ((Thread.currentThread() == animationThread) && !aborting)
        {
            if (doAnimation)
            {
                Image image = ((progressCount % 2) == 0) ?
                              active0 : active1;

                activityIndicator.setImage(image);
                progressCount++;
            }

            try
            {
                synchronized (this)
                {
                    wait(TICK_TIME_MILLIS);
                }
            }
            catch (InterruptedException e)
            {
                // continue running
            }
        }
    }


    public void commandAction(Command command, Displayable d)
    {
        if (command == exitCommand)
        {
            midlet.translatorScreenExit();
        }
        else if (command == translateCommand)
        {
            clearTranslation();

            // start animation
            startActivityIndicator();

            // queue request for sending
            try
            {
                queueRequestGetTranslate();
            }
            catch (UnsupportedEncodingException e)
            {
                stopActivityIndicator();
                
                midlet.translatorScreenError(e.toString());
            }
            catch (IOException e)
            {
                stopActivityIndicator();
                
                midlet.translatorScreenError(e.toString());
            }
        }
        else if (command == cancelCommand)
        {             
            stopActivityIndicator();
            
            // Warning: this aborts all send requests that are queued !
            midlet.translatorScreenAbortHttpPoster();
        }
        else if (command == settingsCommand)