| /* |
| * The contents of this file are subject to the terms |
| * of the Common Development and Distribution License |
| * (the "License"). You may not use this file except |
| * in compliance with the License. |
| * |
| * You can obtain a copy of the license at |
| * http://www.opensource.org/licenses/cddl1.php |
| * See the License for the specific language governing |
| * permissions and limitations under the License. |
| */ |
| package javax.ws.rs.ext; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.util.Properties; |
| |
| public class FactoryFinder { |
| |
| /** |
| * Creates an instance of the specified class using the specified |
| * <code>ClassLoader</code> object. |
| * |
| * @throws ClassNotFoundException if the given class could not be found |
| * or could not be instantiated |
| */ |
| private static Object newInstance(String className, |
| ClassLoader classLoader) throws ClassNotFoundException { |
| try { |
| Class spiClass; |
| if (classLoader == null) { |
| spiClass = Class.forName(className); |
| } else { |
| spiClass = classLoader.loadClass(className); |
| } |
| return spiClass.newInstance(); |
| } catch (ClassNotFoundException x) { |
| throw x; |
| } catch (Exception x) { |
| throw new ClassNotFoundException( |
| "Provider " + className + " could not be instantiated: " + x, |
| x); |
| } |
| } |
| |
| /** |
| * Finds the implementation <code>Class</code> object for the given |
| * factory name, or if that fails, finds the <code>Class</code> object |
| * for the given fallback class name. The arguments supplied MUST be |
| * used in order. If using the first argument is successful, the second |
| * one will not be used. |
| * <p/> |
| * This method is package private so that this code can be shared. |
| * |
| * @param factoryId the name of the factory to find, which is |
| * a system property |
| * @param fallbackClassName the implementation class name, which is |
| * to be used only if nothing else |
| * is found; <code>null</code> to indicate that |
| * there is no fallback class name |
| * @return the <code>Class</code> object of the specified message factory; |
| * may not be <code>null</code> |
| * @throws WebServiceException if there is an error |
| */ |
| static Object find(String factoryId, String fallbackClassName) throws ClassNotFoundException { |
| 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) { |
| } |
| |
| ClassLoader classLoader; |
| try { |
| classLoader = Thread.currentThread().getContextClassLoader(); |
| } catch (Exception x) { |
| throw new ClassNotFoundException(x.toString(), x); |
| } |
| |
| String serviceId = "META-INF/services/" + factoryId; |
| // try to find services in CLASSPATH |
| try { |
| InputStream is; |
| 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); |
| } |
| } |
| } catch (Exception ex) { |
| } |
| |
| |
| // try to read from $java.home/lib/jaxrs.properties |
| try { |
| String javah = System.getProperty("java.home"); |
| String configFile = javah + File.separator + |
| "lib" + File.separator + "jaxrs.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); |
| } |
| } catch (Exception ex) { |
| } |
| |
| |
| // Use the system property |
| try { |
| String systemProp = |
| System.getProperty(factoryId); |
| if (systemProp != null) { |
| return newInstance(systemProp, classLoader); |
| } |
| } catch (SecurityException se) { |
| } |
| |
| if (fallbackClassName == null) { |
| throw new ClassNotFoundException( |
| "Provider for " + factoryId + " cannot be found", null); |
| } |
| |
| return newInstance(fallbackClassName, classLoader); |
| } |
| |
| } |