| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Copyright 2001-2004 The Apache Software Foundation. |
| * |
| * Licensed 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. |
| */ |
| /* |
| * $Id: ObjectFactory.java,v 1.2.4.1 2005/09/15 02:39:54 jeffsuttor Exp $ |
| */ |
| |
| package com.sun.org.apache.xalan.internal.utils; |
| |
| /** |
| * This class is duplicated for each JAXP subpackage so keep it in sync. |
| * It is package private and therefore is not exposed as part of the JAXP |
| * API. |
| * <p> |
| * This class was moved from the <code>javax.xml.parsers.ObjectFactory</code> |
| * class and modified to be used as a general utility for creating objects |
| * dynamically. |
| * |
| * @version $Id: ObjectFactory.java,v 1.11 2010-11-01 04:34:25 joehw Exp $ |
| */ |
| public class ObjectFactory { |
| |
| // |
| // Constants |
| // |
| private static final String JAXP_INTERNAL = "com.sun.org.apache"; |
| private static final String STAX_INTERNAL = "com.sun.xml.internal"; |
| |
| /** Set to true for debugging */ |
| private static final boolean DEBUG = false; |
| |
| |
| /** Prints a message to standard error if debugging is enabled. */ |
| private static void debugPrintln(String msg) { |
| if (DEBUG) { |
| System.err.println("JAXP: " + msg); |
| } |
| } // debugPrintln(String) |
| |
| /** |
| * Figure out which ClassLoader to use. For JDK 1.2 and later use |
| * the context ClassLoader. |
| */ |
| public static ClassLoader findClassLoader() |
| { |
| if (System.getSecurityManager()!=null) { |
| //this will ensure bootclassloader is used |
| return null; |
| } |
| |
| // Figure out which ClassLoader to use for loading the provider |
| // class. If there is a Context ClassLoader then use it. |
| ClassLoader context = SecuritySupport.getContextClassLoader(); |
| ClassLoader system = SecuritySupport.getSystemClassLoader(); |
| |
| ClassLoader chain = system; |
| while (true) { |
| if (context == chain) { |
| // Assert: we are on JDK 1.1 or we have no Context ClassLoader |
| // or any Context ClassLoader in chain of system classloader |
| // (including extension ClassLoader) so extend to widest |
| // ClassLoader (always look in system ClassLoader if Xalan |
| // is in boot/extension/system classpath and in current |
| // ClassLoader otherwise); normal classloaders delegate |
| // back to system ClassLoader first so this widening doesn't |
| // change the fact that context ClassLoader will be consulted |
| ClassLoader current = ObjectFactory.class.getClassLoader(); |
| |
| chain = system; |
| while (true) { |
| if (current == chain) { |
| // Assert: Current ClassLoader in chain of |
| // boot/extension/system ClassLoaders |
| return system; |
| } |
| if (chain == null) { |
| break; |
| } |
| chain = SecuritySupport.getParentClassLoader(chain); |
| } |
| |
| // Assert: Current ClassLoader not in chain of |
| // boot/extension/system ClassLoaders |
| return current; |
| } |
| |
| if (chain == null) { |
| // boot ClassLoader reached |
| break; |
| } |
| |
| // Check for any extension ClassLoaders in chain up to |
| // boot ClassLoader |
| chain = SecuritySupport.getParentClassLoader(chain); |
| } |
| |
| // Assert: Context ClassLoader not in chain of |
| // boot/extension/system ClassLoaders |
| return context; |
| } // findClassLoader():ClassLoader |
| |
| /** |
| * Create an instance of a class using the same class loader for the ObjectFactory by default |
| * or boot class loader when Security Manager is in place |
| */ |
| public static Object newInstance(String className, boolean doFallback) |
| throws ConfigurationError |
| { |
| if (System.getSecurityManager()!=null) { |
| return newInstance(className, null, doFallback); |
| } else { |
| return newInstance(className, |
| findClassLoader (), doFallback); |
| } |
| } |
| |
| /** |
| * Create an instance of a class using the specified ClassLoader |
| */ |
| static Object newInstance(String className, ClassLoader cl, |
| boolean doFallback) |
| throws ConfigurationError |
| { |
| // assert(className != null); |
| try{ |
| Class providerClass = findProviderClass(className, cl, doFallback); |
| Object instance = providerClass.newInstance(); |
| if (DEBUG) debugPrintln("created new instance of " + providerClass + |
| " using ClassLoader: " + cl); |
| return instance; |
| } catch (ClassNotFoundException x) { |
| throw new ConfigurationError( |
| "Provider " + className + " not found", x); |
| } catch (Exception x) { |
| throw new ConfigurationError( |
| "Provider " + className + " could not be instantiated: " + x, |
| x); |
| } |
| } |
| |
| /** |
| * Find a Class using the same class loader for the ObjectFactory by default |
| * or boot class loader when Security Manager is in place |
| */ |
| public static Class<?> findProviderClass(String className, boolean doFallback) |
| throws ClassNotFoundException, ConfigurationError |
| { |
| return findProviderClass (className, |
| findClassLoader (), doFallback); |
| } |
| |
| /** |
| * Find a Class using the specified ClassLoader |
| */ |
| private static Class<?> findProviderClass(String className, ClassLoader cl, |
| boolean doFallback) |
| throws ClassNotFoundException, ConfigurationError |
| { |
| //throw security exception if the calling thread is not allowed to access the |
| //class. Restrict the access to the package classes as specified in java.security policy. |
| SecurityManager security = System.getSecurityManager(); |
| try{ |
| if (security != null){ |
| if (className.startsWith(JAXP_INTERNAL) || |
| className.startsWith(STAX_INTERNAL)) { |
| cl = null; |
| } else { |
| final int lastDot = className.lastIndexOf("."); |
| String packageName = className; |
| if (lastDot != -1) packageName = className.substring(0, lastDot); |
| security.checkPackageAccess(packageName); |
| } |
| } |
| }catch(SecurityException e){ |
| throw e; |
| } |
| |
| Class<?> providerClass; |
| if (cl == null) { |
| providerClass = Class.forName(className, false, ObjectFactory.class.getClassLoader()); |
| } else { |
| try { |
| providerClass = cl.loadClass(className); |
| } catch (ClassNotFoundException x) { |
| if (doFallback) { |
| // Fall back to current classloader |
| ClassLoader current = ObjectFactory.class.getClassLoader(); |
| if (current == null) { |
| providerClass = Class.forName(className); |
| } else if (cl != current) { |
| cl = current; |
| providerClass = cl.loadClass(className); |
| } else { |
| throw x; |
| } |
| } else { |
| throw x; |
| } |
| } |
| } |
| |
| return providerClass; |
| } |
| |
| } // class ObjectFactory |