protected File getGeneratedFile()

in jelly-tags/antlr/src/main/java/org/apache/commons/jelly/tags/antlr/AntlrTag.java [120:174]
45 lines of code
8 McCabe index (conditional complexity)

    protected File getGeneratedFile(String grammar) throws JellyTagException
    {
        File grammarFile = new File( grammar );

        String generatedFileName = null;

        String className = null;
        String packageName = "";

        try {

            BufferedReader in = new BufferedReader(new FileReader(grammar));

            String line;
            while ((line = in.readLine()) != null) {
                line = line.trim();
                int extendsIndex = line.indexOf(" extends ");
                if (line.startsWith("class ") &&  extendsIndex > -1) {
                    generatedFileName = line.substring(6, extendsIndex).trim();
                    break;
                }
                else if ( line.startsWith( "package" ) ) {
                    packageName = line.substring( 8 ).trim();
                }
            }
            in.close();
        } catch (Exception e) {
            throw new JellyTagException("Unable to determine generated class",
                                     e);
        }
        if (generatedFileName == null) {
            return null;
        }

        File genFile = null;

        if ( "".equals( packageName ) )
        {
            genFile = new File( getOutputDir(),
                                generatedFileName + ".java" );
        }
        else
        {
            String packagePath = packageName.replace( '.',
                                                      File.separatorChar );

            packagePath = packagePath.replace( ';',
                                               File.separatorChar );

            genFile = new File( new File( getOutputDir(), packagePath),
                                generatedFileName + ".java" );
        }

        return genFile;
    }