protected Path configureApplication()

in proposals/gk/log4j2/src/java/org/apache/turbine/Turbine.java [388:484]
76 lines of code
11 McCabe index (conditional complexity)

    protected Path configureApplication( ServletConfig config, ServletContext context )
        throws IOException, ConfigurationException
    {
        ConfigurationStyle confStyle = ConfigurationStyle.UNSET;
        // first test
        String confFile= findInitParameter(context, config,
                TurbineConfig.CONFIGURATION_PATH_KEY,
                null);
        if (StringUtils.isNotEmpty(confFile))
        {
            confStyle = ConfigurationStyle.XML;
        }
        else // second test
        {
            confFile = findInitParameter(context, config,
                    TurbineConfig.PROPERTIES_PATH_KEY,
                                         null);
            if (StringUtils.isNotEmpty((confFile)) )
            {
                confStyle = ConfigurationStyle.PROPERTIES;
            }
        }
        // more tests ..
        // last test
        if (confStyle == ConfigurationStyle.UNSET)
        {  // last resort
             confFile = findInitParameter(context, config,
                    TurbineConfig.PROPERTIES_PATH_KEY,
                    TurbineConfig.PROPERTIES_PATH_DEFAULT);
             confStyle = ConfigurationStyle.PROPERTIES;
        }
        
        // First report
        log.debug("Loading configuration (" + confStyle + ") from " + confFile);

        // now begin loading
        Parameters params = new Parameters();
        File confPath = getApplicationRootAsFile(); 

        if (confFile.startsWith( "/" ))
        {
            confFile = confFile.substring( 1 ); // cft. RFC2396 should not start with a slash, if not absolute path
        }

        Path confFileRelativePath =  Paths.get( confFile );// relative to later join
        Path targetPath = Paths.get( confPath.toURI() );
        targetPath = targetPath.resolve( confFileRelativePath );

        // Get the target path directory
        Path targetPathDirectory = targetPath.getParent();
        if ( targetPathDirectory != null )
        {
            // set the configuration path
            confPath = targetPathDirectory.normalize().toFile();

            Path targetFilePath = targetPath.getFileName();
            if ( targetFilePath != null )
            {
                // set the configuration file name
                confFile = targetFilePath.toString();
            }
            
        }

        switch (confStyle)
        {
            case XML:
                // relative base path used for this and child configuration files
                CombinedConfigurationBuilder combinedBuilder = new CombinedConfigurationBuilder()
                    .configure(params.fileBased()
                        .setFileName(confFile)
                        .setListDelimiterHandler(new DefaultListDelimiterHandler(','))
                        .setLocationStrategy(new HomeDirectoryLocationStrategy(confPath.getCanonicalPath(), false)));
                configuration = combinedBuilder.getConfiguration();
                break;

            case PROPERTIES:
                FileBasedConfigurationBuilder<PropertiesConfiguration> propertiesBuilder =
                                new FileBasedConfigurationBuilder<>(
                                                PropertiesConfiguration.class)
                    .configure(params.properties()
                        .setFileName(confFile)
                        .setListDelimiterHandler(new DefaultListDelimiterHandler(','))
                        .setLocationStrategy(new HomeDirectoryLocationStrategy(confPath.getCanonicalPath(), false)));
                configuration = propertiesBuilder.getConfiguration();
                break;
            case JSON: case YAML:
                throw new NotImplementedException("JSON or XAML configuration style not yet implemented!");

            default:
                break;
        }
        // Now report our successful configuration to the world
        log.info("Loaded configuration (" + confStyle + ") from " + confFile + " style: " + configuration.toString());

        return targetPath;
    }