| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
| * |
| * Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved. |
| * |
| * The contents of this file are subject to the terms of either the GNU |
| * General Public License Version 2 only ("GPL") or the Common Development |
| * and Distribution License("CDDL") (collectively, the "License"). You |
| * may not use this file except in compliance with the License. You can |
| * obtain a copy of the License at |
| * http://glassfish.java.net/public/CDDL+GPL_1_1.html |
| * or packager/legal/LICENSE.txt. See the License for the specific |
| * language governing permissions and limitations under the License. |
| * |
| * When distributing the software, include this License Header Notice in each |
| * file and include the License file at packager/legal/LICENSE.txt. |
| * |
| * GPL Classpath Exception: |
| * Oracle designates this particular file as subject to the "Classpath" |
| * exception as provided by Oracle in the GPL Version 2 section of the License |
| * file that accompanied this code. |
| * |
| * Modifications: |
| * If applicable, add the following below the License Header, with the fields |
| * enclosed by brackets [] replaced by your own identifying information: |
| * "Portions Copyright [year] [name of copyright owner]" |
| * |
| * Contributor(s): |
| * If you wish your version of this file to be governed by only the CDDL or |
| * only the GPL Version 2, indicate your decision by adding "[Contributor] |
| * elects to include this software in this distribution under the [CDDL or GPL |
| * Version 2] license." If you don't indicate a single choice of license, a |
| * recipient has the option to distribute your version of this file under |
| * either the CDDL, the GPL Version 2 or to extend the choice of license to |
| * its licensees as provided above. However, if you add GPL Version 2 code |
| * and therefore, elected the GPL Version 2 license, then the option applies |
| * only if the new code is made subject to such option by the copyright |
| * holder. |
| */ |
| package javax.ws.rs.client; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.Properties; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Factory finder utility class. |
| * |
| * @author Paul Sandoz |
| * @author Marc Hadley |
| * @since 1.0 |
| */ |
| final class FactoryFinder { |
| |
| private static final Logger LOGGER = Logger.getLogger(FactoryFinder.class.getName()); |
| |
| private FactoryFinder() { |
| // prevents instantiation |
| } |
| |
| static ClassLoader getContextClassLoader() { |
| return AccessController.doPrivileged( |
| new PrivilegedAction<ClassLoader>() { |
| |
| @Override |
| public ClassLoader run() { |
| ClassLoader cl = null; |
| try { |
| cl = Thread.currentThread().getContextClassLoader(); |
| } catch (SecurityException ex) { |
| LOGGER.log( |
| Level.WARNING, |
| "Unable to get context classloader instance.", |
| ex); |
| } |
| return cl; |
| } |
| }); |
| } |
| |
| /** |
| * Creates an instance of the specified class using the specified |
| * <code>ClassLoader</code> object. |
| * |
| * @param className name of the class to be instantiated. |
| * @param classLoader class loader to be used. |
| * @return instance of the specified class. |
| * @throws ClassNotFoundException if the given class could not be found |
| * or could not be instantiated |
| */ |
| private static Object newInstance(final String className, final ClassLoader classLoader) throws ClassNotFoundException { |
| try { |
| Class spiClass; |
| if (classLoader == null) { |
| spiClass = Class.forName(className); |
| } else { |
| try { |
| spiClass = Class.forName(className, false, classLoader); |
| } catch (ClassNotFoundException ex) { |
| LOGGER.log( |
| Level.FINE, |
| "Unable to load provider class " + className |
| + " using custom classloader " + classLoader.getClass().getName() |
| + " trying again with current classloader.", |
| ex); |
| spiClass = Class.forName(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 ClassNotFoundException if the given class could not be found |
| * or could not be instantiated |
| */ |
| static Object find(final String factoryId, final 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 = getContextClassLoader(); |
| |
| 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) { |
| LOGGER.log(Level.FINER, "Failed to load service " + factoryId + " from " + serviceId, 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) { |
| LOGGER.log(Level.FINER, "Failed to load service " + factoryId |
| + " from $java.home/lib/jaxrs.properties", ex); |
| } |
| |
| |
| // Use the system property |
| try { |
| String systemProp = System.getProperty(factoryId); |
| if (systemProp != null) { |
| return newInstance(systemProp, classLoader); |
| } |
| } catch (SecurityException se) { |
| LOGGER.log(Level.FINER, "Failed to load service " + factoryId |
| + " from a system property", se); |
| } |
| |
| if (fallbackClassName == null) { |
| throw new ClassNotFoundException( |
| "Provider for " + factoryId + " cannot be found", null); |
| } |
| |
| return newInstance(fallbackClassName, classLoader); |
| } |
| } |
