translatorservice.java

J2ME MIDP_Example_Applications

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// retains the right to make changes to this source code at
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package example.translator;


import java.rmi.RemoteException;
import java.util.Locale;
import java.util.Properties;


public class TranslatorService
     implements Translator
{
    // The language options (i.e. the inputLocale and outputLocale)
    // are strings should that follow the IETF RFC 3066 'Tags for the
    // Identification of Languages'. Only simple language tags like
    // "en" and "pt" are currently used.
    
    private final static String[] locales = { "de",
                                              "en",
                                              "es",
                                              "fr",
                                              "it",
                                              "pt" };
    private final static int DE = 0;
    private final static int EN = 1;
    private final static int ES = 2;
    private final static int FR = 3;
    private final static int IT = 4;
    private final static int PT = 5;


    private String[] getOutputLocales(String inputLocale)
        throws RemoteException
    {
        // The service's options for translating text from one language
        // to another may depend on the input language.
        String[] deTranslationOptions = { locales[EN], locales[FR] };
        String[] enTranslationOptions = { locales[ES],
                                          locales[DE],
                                          locales[FR],
                                          locales[IT],
                                          locales[PT] };
        String[] esTranslationOptions = { locales[EN] };
        String[] frTranslationOptions = { locales[DE], locales[EN] };
        String[] itTranslationOptions = { locales[EN] };
        String[] ptTranslationOptions = { locales[EN] };

        if (inputLocale.startsWith(locales[DE]))
        {
            return deTranslationOptions;
        }
        else if (inputLocale.startsWith(locales[EN]))
        {
            return enTranslationOptions;
        }
        else if (inputLocale.startsWith(locales[ES]))
        {
            return esTranslationOptions;
        }
        else if (inputLocale.startsWith(locales[FR]))
        {
            return frTranslationOptions;
        }
        else if (inputLocale.startsWith(locales[IT]))
        {
            return itTranslationOptions;
        }
        else if (inputLocale.startsWith(locales[PT]))
        {
            return ptTranslationOptions;
        }
        else
        {
            String msg = errorString("Translation not supported for " +
                                     '"' + inputLocale + '"');
            throw new RemoteException(msg);
        }
    }


    private boolean isTranslationSupported(String inputLocale,
                                           String outputLocale)
        throws RemoteException
    {
        String[] supportedOutputLocales = getOutputLocales(inputLocale);
        int i;

        for (i = 0; i < supportedOutputLocales.length; i++)
        {
            if (supportedOutputLocales[i].startsWith(
                outputLocale.substring(0, 1)))
            {
                break;
            }
        }

        if (i == supportedOutputLocales.length)
        {
            return false;
        }
        else
        {
            return true;
        }
    }


    public String getTranslation(String inputLocale,
                                 String outputLocale,
                                 String inputText)
        throws RemoteException
    {
        if (isTranslationSupported(inputLocale, outputLocale))
        {
            // Note: A real translation service should be used
            // instead of the simple dummy 'test' implementation below.

            return dummyGetTranslation(inputLocale,
                                       outputLocale,
                                       inputText);
        }
        else
        {
            String msg = errorString("Translation not supported from " +
                                     '"' + inputLocale + '"' + " to " +
                                     '"' + outputLocale + '"');
            throw new RemoteException(msg);
        }
    }


    // An overly simplified implementation of a translation service.
    // It only translates a small pre-defined set of phrases.
    private String dummyGetTranslation(String inputLocale,
                                       String outputLocale,
                                       String inputText)
        throws RemoteException
    {        
        // Each row contains a phrase translated in the
        // following order: DE, EN, ES, FR, IT, PT
        String[][] phrases =
        {
            { "katze", "cat", "gato", "chat", "gatto", "gato" },               
             
            { "hallo", "hello", "hola", "bonjour", "ciao", "ol