protected  void doUnload(Object program,
    String filename,
    File baseDir) throws LanguageException 
{
        // Do nothing. Source is already deleted by the AbstractProgrammingLanguage.
}

 public String getSourceExtension() 
{
        return "js";
}

Return the language's canonical source file extension.

 public Program load(String filename,
    File baseDirectory,
    String encoding) throws LanguageException 
{
        // Does source file exist?
        File sourceFile = new File(baseDirectory,
                filename + "." + this.getSourceExtension());
        if (!sourceFile.exists()) {
            throw new LanguageException("Can't load program - File doesn't exist: "
                    + IOUtils.getFullFilename(sourceFile));
        }
        if (!sourceFile.isFile()) {
            throw new LanguageException("Can't load program - File is not a normal file: "
                    + IOUtils.getFullFilename(sourceFile));
        }
        if (!sourceFile.canRead()) {
            throw new LanguageException("Can't load program - File cannot be read: "
                    + IOUtils.getFullFilename(sourceFile));
        }
        Class clazz = null;
        ArrayList dependecies = new ArrayList();
        String className = null;
        BufferedReader r = null;
        try {
            r = new BufferedReader(new FileReader(sourceFile));
            className = getMeta(r.readLine(), "extends");
            if (className == null) {
                throw new LanguageException("Can't load program - Signature is not found: "
                        + IOUtils.getFullFilename(sourceFile));
            }
            clazz = ClassUtils.loadClass(className);
            String line;
            while((line = getMeta(r.readLine(), "depends")) != null) {
                dependecies.add(line);
            }
        } catch (IOException e) {
            throw new LanguageException("Can't load program - Signature is not found: "
                    + IOUtils.getFullFilename(sourceFile));
        } catch (ClassNotFoundException e) {
            throw new LanguageException("Can't load program - Base class " + className + " is not found: "
                    + IOUtils.getFullFilename(sourceFile));
        } finally {
            if (r != null) try {
                r.close();
            } catch (IOException ignored) {
            }
        }
        return new JavascriptProgram(sourceFile, clazz, dependecies);
}

 public Program preload(String filename,
    File baseDirectory,
    String encoding) throws LanguageException 
{
        return load(filename, baseDirectory, encoding);
}

 public String quoteString(String constant) 
{
        return XSLTExtension.escapeJavaString(constant);
}