| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package javax.xml.stream; |
| |
| import java.io.InputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| |
| import java.util.Arrays; |
| import java.util.Properties; |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| |
| /* |
| * Here is the beef on the finding the Factory Class |
| * |
| * 1. Use the javax.xml.stream.XMLInputFactory system property. 2. Use the |
| * properties file "lib/stax.properties" in the JRE directory. This |
| * configuration file is in standard java.util.Properties format and contains |
| * the fully qualified name of the implementation class with the key being the |
| * system property defined above. 3. Use the Services API (as detailed in the |
| * JAR specification), if available, to determine the classname. The Services |
| * API will look for a classname in the file |
| * META-INF/services/javax.xml.stream.XMLInputFactory in jars available to the |
| * runtime. Platform default XMLInputFactory instance. |
| * |
| * If the user provided a classloader we'll use that...if not, we'll assume the |
| * classloader of this class. |
| */ |
| |
| class FactoryLocator { |
| static Object locate(String factoryId) throws FactoryConfigurationError { |
| return locate(factoryId, null); |
| } |
| |
| static Object locate(String factoryId, String[] altClassName) |
| throws FactoryConfigurationError { |
| return locate(factoryId, altClassName, |
| Thread.currentThread().getContextClassLoader()); |
| } |
| |
| 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); |
| } |
| |
| private static Object loadFactory(String[] classNames, ClassLoader classLoader) |
| throws FactoryConfigurationError { |
| for (String className : classNames) { |
| try { |
| Class factoryClass = classLoader == null ? Class.forName(className) |
| : classLoader.loadClass(className); |
| |
| return factoryClass.newInstance(); |
| } catch (Exception x) { |
| } |
| } |
| throw new FactoryConfigurationError("Requested factory " |
| + Arrays.asList(classNames).toString() |
| + " could not be instantiated"); |
| } |
| |
| private static Object loadFactory(String className, ClassLoader classLoader) |
| throws FactoryConfigurationError { |
| try { |
| Class factoryClass = classLoader == null ? Class.forName(className) |
| : classLoader.loadClass(className); |
| |
| return factoryClass.newInstance(); |
| } catch (ClassNotFoundException x) { |
| throw new FactoryConfigurationError("Requested factory " |
| + className + " cannot be located. Classloader =" |
| + classLoader.toString(), x); |
| } catch (Exception x) { |
| throw new FactoryConfigurationError("Requested factory " |
| + className + " could not be instantiated: " + x, x); |
| } |
| } |
| } |