static Object find()

in jaxp-api-1.3/src/main/java/javax/xml/datatype/FactoryFinder.java [184:252]
57 lines of code
17 McCabe index (conditional complexity)

    static Object find(String factoryId, String fallbackClassName)
        throws ConfigurationError {
        	
        ClassLoader classLoader = findClassLoader();

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

        // Use the system property first
        try {
            String systemProp = SecuritySupport.getSystemProperty(factoryId);
            if (systemProp != null) {
                if (debug) debugPrintln("found " + systemProp + " in the system property " + factoryId);
                return newInstance(systemProp, classLoader);
            }
        } catch (SecurityException se) {
        	; // NOP, explicitly ignore SecurityException
        }

        // try to read from $java.home/lib/jaxp.properties
        try {
            String javah = SecuritySupport.getSystemProperty("java.home");
            String configFile = javah + File.separator + "lib" + File.separator + "jaxp.properties";
			String factoryClassName = null;
			if (firstTime) {
				synchronized (cacheProps) {
					if (firstTime) {
						File f = new File(configFile);
						firstTime = false;
						if (SecuritySupport.doesFileExist(f)) {
							if (debug) debugPrintln("Read properties file " + f);
							cacheProps.load(SecuritySupport.getFileInputStream(f));
						}
					}
				}
			}
			factoryClassName = cacheProps.getProperty(factoryId);
            if (debug) debugPrintln("found " + factoryClassName + " in $java.home/jaxp.properties"); 
			
			if (factoryClassName != null) {
				return newInstance(factoryClassName, classLoader);
			}
        } catch (Exception ex) {
            if (debug) {
            	ex.printStackTrace();
            } 
        }
        
        // Try Jar Service Provider Mechanism
        Object provider = findJarServiceProvider(factoryId);
        if (provider != null) {
            return provider;
        }

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

        if (debug) debugPrintln("loaded from fallback value: " + fallbackClassName);
        return newInstance(fallbackClassName, classLoader);
    }