createTimestamp( grammarInfo );
    }

    /**
     * Gets the effective package name for the AST node files.
     * 
     * @return The effective package name for the AST node files, never <code>null</code>.
     */
    private String getNodePackageName()
    {
        if ( this.packageName != null )
        {
            return this.packageName + ".syntaxtree";
        }
        else if ( this.nodePackageName != null )
        {
            return this.nodePackageName;
        }
        else
        {
            return "*.syntaxtree";
        }
    }

    /**
     * Gets the effective package name for the visitor files.
     * 
     * @return The effective package name for the visitor files, never <code>null</code>.
     */
    private String getVisitorPackageName()
    {
        if ( this.packageName != null )
        {
            return this.packageName + ".visitor";
        }
        else if ( this.visitorPackageName != null )
        {
            return this.visitorPackageName;
        }
        else
        {
            return "*.visitor";
        }
    }

    /**
     * Creates a new facade to invoke JTB. Most options for the invocation are derived from the current values of the
     * corresponding mojo parameters. The caller is responsible to set the input file, output directories and packages
     * on the returned facade.
     * 
     * @return The facade for the tool invocation, never <code>null</code>.
     */
    private JTB newJTB()
    {
        JTB jtb = new JTB();
        jtb.setLog( getLog() );
        jtb.setDescriptiveFieldNames( this.descriptiveFieldNames );
        jtb.setJavadocFriendlyComments( this.javadocFriendlyComments );
        jtb.setNodeParentClass( this.nodeParentClass );
        jtb.setParentPointers( this.parentPointers );
        jtb.setPrinter( this.printer );
        jtb.setScheme( this.scheme );
        jtb.setSpecialTokens( this.specialTokens );
        jtb.setSupressErrorChecking( this.supressErrorChecking );
        return jtb;
    }

}

    public void setInputFile( File value )
    {
        if ( value != null && !value.isAbsolute() )
        {
            throw new IllegalArgumentException( "path is not absolute: " + value );
        }
        this.inputFile = value;
    }

    /**
     * Sets the absolute path to the output directory for the generated grammar file.
     * 
     * @param value The absolute path to the output directory for the generated grammar file. If this directory does not
     *            exist yet, it is created. Note that this path should already include the desired package hierarchy
     *            because JTB will not append the required sub directories automatically.
     */
    public void setOutputDirectory( File value )
    {
        if ( value != null && !value.isAbsolute() )
        {
            throw new IllegalArgumentException( "path is not absolute: " + value );
        }
        this.outputDirectory = value;
    }

    /**
     * Gets the absolute path to the enhanced grammar file generated by JTB.
     * 
     * @return The absolute path to the enhanced grammar file generated by JTB or <code>null</code> if either the
     *         input file or the output directory have not been set.
     */
    public File getOutputFile()
    {
        File outputFile = null;
        if ( this.outputDirectory != null && this.inputFile != null )
        {
            String fileName = FileUtils.removeExtension( this.inputFile.getName() ) + ".jj";
            outputFile = new File( this.outputDirectory, fileName );
        }
        return outputFile;
    }

    /**
     * Sets the absolute path to the output directory for the syntax tree files.
     * 
     * @param value The absolute path to the output directory for the generated syntax tree files, may be
     *            <code>null</code> to use a sub directory in the output directory of the grammar file. If this
     *            directory does not exist yet, it is created. Note that this path should already include the desired
     *            package hierarchy because JTB will not append the required sub directories automatically.
     */
    public void setNodeDirectory( File value )

        jjtree.setStatic( this.isStatic );
        jjtree.setBuildNodeFiles( this.buildNodeFiles );
        jjtree.setMulti( this.multi );
        jjtree.setNodeDefaultVoid( this.nodeDefaultVoid );
        jjtree.setNodeClass( this.nodeClass );
        jjtree.setNodeFactory( this.nodeFactory );
        jjtree.setNodePrefix( this.nodePrefix );
        jjtree.setNodeScopeHook( this.nodeScopeHook );
        jjtree.setNodeUsesParser( this.nodeUsesParser );
        jjtree.setTrackTokens( this.trackTokens );
        jjtree.setVisitor( this.visitor );
        jjtree.setVisitorDataType( this.visitorDataType );
        jjtree.setVisitorReturnType( this.visitorReturnType );
        jjtree.setVisitorException( this.visitorException );
        return jjtree;
    }