static Object locate()

in stax-api-1.2/src/main/java/javax/xml/stream/FactoryLocator.java [56:122]
59 lines of code
14 McCabe index (conditional complexity)

	static Object locate(String factoryId, String[] altClassName,
                         ClassLoader classLoader) throws FactoryConfigurationError {
        try {
            // If we are deployed into an OSGi environment, leverage it
            ClassLoader cl = FactoryLocator.class.getClassLoader();
            if (cl == null) {
                cl = ClassLoader.getSystemClassLoader();
            }
            Class factoryClass = cl.loadClass(factoryId);
            Class spiClass = org.apache.servicemix.specs.locator.OsgiLocator.locate(factoryClass, factoryId);
            if (spiClass != null) {
                return spiClass.newInstance();
            }
        } catch (Throwable e) {
        }

        try {
			String prop = System.getProperty(factoryId);
			if (prop != null) {
				return loadFactory(prop, classLoader);
			}
		} catch (Exception e) {
		}

		try {
			String configFile = System.getProperty("java.home")
					+ File.separator + "lib" + File.separator
					+ "stax.properties";
			File f = new File(configFile);
			if (f.exists()) {
				Properties props = new Properties();
				props.load(new FileInputStream(f));
				String factoryClassName = props.getProperty(factoryId);
				return loadFactory(factoryClassName, classLoader);
			}
		} catch (Exception e) {
		}

		String serviceId = "META-INF/services/" + factoryId;
		try {
			InputStream is = null;

			if (classLoader == null) {
				is = ClassLoader.getSystemResourceAsStream(serviceId);
			} else {
				is = classLoader.getResourceAsStream(serviceId);
			}

			if (is != null) {
				BufferedReader br = new BufferedReader(new InputStreamReader(
						is, "UTF-8"));
				String factoryClassName = br.readLine();
				br.close();

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

		if (altClassName == null) {
			throw new FactoryConfigurationError("Unable to locate factory for "
					+ factoryId + ".", null);
		}
		return loadFactory(altClassName, classLoader);
	}