static Object find()

in javax-el-api-2.2.5/src/main/java/javax/el/FactoryFinder.java [130:213]
69 lines of code
15 McCabe index (conditional complexity)

    static Object find(String factoryId, String fallbackClassName,
                       Properties properties)
    {
         try {
            // If we are deployed into an OSGi environment, leverage it
            Class factoryClass = null;
            try {
                factoryClass = FactoryFinder.class.getClassLoader().loadClass(factoryId);
            } catch (Throwable t) {
                throw t;
            }
            Class spiClass = org.apache.servicemix.specs.locator.OsgiLocator.locate(factoryClass, factoryId);
            if (spiClass != null) {
                return spiClass.newInstance();
            }
        } catch (Throwable e) {
        }

        ClassLoader classLoader;
        try {
            classLoader = Thread.currentThread().getContextClassLoader();
        } catch (Exception x) {
            throw new ELException(x.toString(), x);
        }

        String serviceId = "META-INF/services/" + factoryId;
        // try to find services in CLASSPATH
        try {
            InputStream is=null;
            if (classLoader == null) {
                is=ClassLoader.getSystemResourceAsStream(serviceId);
            } else {
                is=classLoader.getResourceAsStream(serviceId);
            }
        
            if( is!=null ) {
                BufferedReader rd =
                    new BufferedReader(new InputStreamReader(is, "UTF-8"));
        
                String factoryClassName = rd.readLine();
                rd.close();

                if (factoryClassName != null &&
                    ! "".equals(factoryClassName)) {
                    return newInstance(factoryClassName, classLoader, properties);
                }
            }
        } catch( Exception ex ) {
        }
        

        // try to read from $java.home/lib/el.properties
        try {
            String javah=System.getProperty( "java.home" );
            String configFile = javah + File.separator +
                "lib" + File.separator + "el.properties";
            File f=new File( configFile );
            if( f.exists()) {
                Properties props=new Properties();
                props.load( new FileInputStream(f));
                String factoryClassName = props.getProperty(factoryId);
                return newInstance(factoryClassName, classLoader, properties);
            }
        } catch(Exception ex ) {
        }


        // Use the system property
        try {
            String systemProp =
                System.getProperty( factoryId );
            if( systemProp!=null) {
                return newInstance(systemProp, classLoader, properties);
            }
        } catch (SecurityException se) {
        }

        if (fallbackClassName == null) {
            throw new ELException(
                "Provider for " + factoryId + " cannot be found", null);
        }

        return newInstance(fallbackClassName, classLoader, properties);
    }