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/*
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* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.xml.bind;
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import java.util.Iterator;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.UnsupportedEncodingException;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.net.URL;
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import java.util.Map;
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import java.util.Properties;
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import java.util.StringTokenizer;
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import java.util.logging.ConsoleHandler;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import java.security.AccessController;
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import static javax.xml.bind.JAXBContext.JAXB_CONTEXT_FACTORY;
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/**
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* This class is package private and therefore is not exposed as part of the
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* JAXB API.
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*
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* This code is designed to implement the JAXB 1.0 spec pluggability feature
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*
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* @author <ul><li>Ryan Shoemaker, Sun Microsystems, Inc.</li></ul>
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* @see JAXBContext
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*/
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class ContextFinder {
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private static final Logger logger;
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static {
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logger = Logger.getLogger("javax.xml.bind");
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try {
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if (AccessController.doPrivileged(new GetPropertyAction("jaxb.debug")) != null) {
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// disconnect the logger from a bigger framework (if any)
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// and take the matters into our own hands
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logger.setUseParentHandlers(false);
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logger.setLevel(Level.ALL);
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ConsoleHandler handler = new ConsoleHandler();
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handler.setLevel(Level.ALL);
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logger.addHandler(handler);
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} else {
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// don't change the setting of this logger
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// to honor what other frameworks
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// have done on configurations.
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}
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} catch(Throwable t) {
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// just to be extra safe. in particular System.getProperty may throw
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// SecurityException.
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}
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}
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/**
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* If the {@link InvocationTargetException} wraps an exception that shouldn't be wrapped,
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* throw the wrapped exception.
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*/
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private static void handleInvocationTargetException(InvocationTargetException x) throws JAXBException {
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Throwable t = x.getTargetException();
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if( t != null ) {
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if( t instanceof JAXBException )
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// one of our exceptions, just re-throw
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throw (JAXBException)t;
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if( t instanceof RuntimeException )
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// avoid wrapping exceptions unnecessarily
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throw (RuntimeException)t;
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if( t instanceof Error )
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throw (Error)t;
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}
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}
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/**
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* Determine if two types (JAXBContext in this case) will generate a ClassCastException.
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*
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* For example, (targetType)originalType
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*
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* @param originalType
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* The Class object of the type being cast
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* @param targetType
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* The Class object of the type that is being cast to
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* @return JAXBException to be thrown.
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*/
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private static JAXBException handleClassCastException(Class originalType, Class targetType) {
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final URL targetTypeURL = which(targetType);
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return new JAXBException(Messages.format(Messages.ILLEGAL_CAST,
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// we don't care where the impl class is, we want to know where JAXBContext lives in the impl
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// class' ClassLoader
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getClassClassLoader(originalType).getResource("javax/xml/bind/JAXBContext.class"),
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targetTypeURL));
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}
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/**
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* Create an instance of a class using the specified ClassLoader
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*/
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static JAXBContext newInstance( String contextPath,
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String className,
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ClassLoader classLoader,
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Map properties )
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throws JAXBException {
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try {
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Class spFactory = safeLoadClass(className,classLoader);
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return newInstance(contextPath, spFactory, classLoader, properties);
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} catch (ClassNotFoundException x) {
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throw new JAXBException(
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Messages.format( Messages.PROVIDER_NOT_FOUND, className ),
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x);
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} catch (RuntimeException x) {
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// avoid wrapping RuntimeException to JAXBException,
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// because it indicates a bug in this code.
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throw x;
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} catch (Exception x) {
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// can't catch JAXBException because the method is hidden behind
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// reflection. Root element collisions detected in the call to
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// createContext() are reported as JAXBExceptions - just re-throw it
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// some other type of exception - just wrap it
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throw new JAXBException(
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Messages.format( Messages.COULD_NOT_INSTANTIATE, className, x ),
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x);
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}
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}
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static JAXBContext newInstance( String contextPath,
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Class spFactory,
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ClassLoader classLoader,
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Map properties )
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throws JAXBException
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{
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try {
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/*
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* javax.xml.bind.context.factory points to a class which has a
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* static method called 'createContext' that
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* returns a javax.xml.JAXBContext.
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*/
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Object context = null;
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// first check the method that takes Map as the third parameter.
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// this is added in 2.0.
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try {
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Method m = spFactory.getMethod("createContext",String.class,ClassLoader.class,Map.class);
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// any failure in invoking this method would be considered fatal
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context = m.invoke(null,contextPath,classLoader,properties);
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} catch (NoSuchMethodException e) {
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// it's not an error for the provider not to have this method.
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}
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if(context==null) {
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// try the old method that doesn't take properties. compatible with 1.0.
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// it is an error for an implementation not to have both forms of the createContext method.
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Method m = spFactory.getMethod("createContext",String.class,ClassLoader.class);
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// any failure in invoking this method would be considered fatal
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context = m.invoke(null,contextPath,classLoader);
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}
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if(!(context instanceof JAXBContext)) {
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// the cast would fail, so generate an exception with a nice message
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throw handleClassCastException(context.getClass(), JAXBContext.class);
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}
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return (JAXBContext)context;
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} catch (InvocationTargetException x) {
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handleInvocationTargetException(x);
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// for other exceptions, wrap the internal target exception
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// with a JAXBException
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Throwable e = x;
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if(x.getTargetException()!=null)
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e = x.getTargetException();
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throw new JAXBException( Messages.format( Messages.COULD_NOT_INSTANTIATE, spFactory, e ), e );
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} catch (RuntimeException x) {
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// avoid wrapping RuntimeException to JAXBException,
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// because it indicates a bug in this code.
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throw x;
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} catch (Exception x) {
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// can't catch JAXBException because the method is hidden behind
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// reflection. Root element collisions detected in the call to
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// createContext() are reported as JAXBExceptions - just re-throw it
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// some other type of exception - just wrap it
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throw new JAXBException(
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Messages.format( Messages.COULD_NOT_INSTANTIATE, spFactory, x ),
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x);
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}
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}
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/**
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* Create an instance of a class using the thread context ClassLoader
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*/
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static JAXBContext newInstance(
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Class[] classes,
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Map properties,
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String className) throws JAXBException {
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ClassLoader cl = getContextClassLoader();
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Class spi;
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try {
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spi = safeLoadClass(className,cl);
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} catch (ClassNotFoundException e) {
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throw new JAXBException(e);
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}
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if(logger.isLoggable(Level.FINE)) {
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// extra check to avoid costly which operation if not logged
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logger.log(Level.FINE, "loaded {0} from {1}", new Object[]{className, which(spi)});
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}
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return newInstance(classes, properties, spi);
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}
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static JAXBContext newInstance(Class[] classes,
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Map properties,
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Class spFactory) throws JAXBException {
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Method m;
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try {
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m = spFactory.getMethod("createContext", Class[].class, Map.class);
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} catch (NoSuchMethodException e) {
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throw new JAXBException(e);
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}
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try {
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Object context = m.invoke(null, classes, properties);
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if(!(context instanceof JAXBContext)) {
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// the cast would fail, so generate an exception with a nice message
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throw handleClassCastException(context.getClass(), JAXBContext.class);
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}
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return (JAXBContext)context;
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} catch (IllegalAccessException e) {
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throw new JAXBException(e);
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} catch (InvocationTargetException e) {
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handleInvocationTargetException(e);
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Throwable x = e;
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if (e.getTargetException() != null)
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x = e.getTargetException();
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throw new JAXBException(x);
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}
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}
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static JAXBContext find(String factoryId, String contextPath, ClassLoader classLoader, Map properties ) throws JAXBException {
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// TODO: do we want/need another layer of searching in $java.home/lib/jaxb.properties like JAXP?
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final String jaxbContextFQCN = JAXBContext.class.getName();
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// search context path for jaxb.properties first
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StringBuilder propFileName;
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StringTokenizer packages = new StringTokenizer( contextPath, ":" );
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String factoryClassName;
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if(!packages.hasMoreTokens())
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// no context is specified
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throw new JAXBException(Messages.format(Messages.NO_PACKAGE_IN_CONTEXTPATH));
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logger.fine("Searching jaxb.properties");
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while( packages.hasMoreTokens() ) {
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String packageName = packages.nextToken(":").replace('.','/');
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// com.acme.foo - > com/acme/foo/jaxb.properties
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propFileName = new StringBuilder().append(packageName).append("/jaxb.properties");
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Properties props = loadJAXBProperties( classLoader, propFileName.toString() );
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if (props != null) {
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if (props.containsKey(factoryId)) {
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factoryClassName = props.getProperty(factoryId);
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return newInstance( contextPath, factoryClassName, classLoader, properties );
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} else {
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throw new JAXBException(Messages.format(Messages.MISSING_PROPERTY, packageName, factoryId));
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}
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}
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}
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logger.fine("Searching the system property");
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// search for a system property second (javax.xml.bind.JAXBContext)
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factoryClassName = AccessController.doPrivileged(new GetPropertyAction(JAXBContext.JAXB_CONTEXT_FACTORY));
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if( factoryClassName != null ) {
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return newInstance( contextPath, factoryClassName, classLoader, properties );
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} else { // leave this here to assure compatibility
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factoryClassName = AccessController.doPrivileged(new GetPropertyAction(jaxbContextFQCN));
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if( factoryClassName != null ) {
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return newInstance( contextPath, factoryClassName, classLoader, properties );
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}
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}
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if (getContextClassLoader() == classLoader) {
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Class factory = lookupUsingOSGiServiceLoader("javax.xml.bind.JAXBContext");
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if (factory != null) {
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logger.fine("OSGi environment detected");
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return newInstance(contextPath, factory, classLoader, properties);
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}
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}
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logger.fine("Searching META-INF/services");
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// search META-INF services next
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BufferedReader r;
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try {
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final StringBuilder resource = new StringBuilder().append("META-INF/services/").append(jaxbContextFQCN);
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final InputStream resourceStream =
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classLoader.getResourceAsStream(resource.toString());
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if (resourceStream != null) {
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r = new BufferedReader(new InputStreamReader(resourceStream, "UTF-8"));
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factoryClassName = r.readLine().trim();
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r.close();
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return newInstance(contextPath, factoryClassName, classLoader, properties);
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} else {
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logger.log(Level.FINE, "Unable to load:{0}", resource.toString());
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}
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} catch (UnsupportedEncodingException e) {
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// should never happen
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throw new JAXBException(e);
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} catch (IOException e) {
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throw new JAXBException(e);
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}
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// else no provider found
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logger.fine("Trying to create the platform default provider");
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return newInstance(contextPath, PLATFORM_DEFAULT_FACTORY_CLASS, classLoader, properties);
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}
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static JAXBContext find( Class[] classes, Map properties ) throws JAXBException {
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final String jaxbContextFQCN = JAXBContext.class.getName();
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String factoryClassName;
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// search for jaxb.properties in the class loader of each class first
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for (final Class c : classes) {
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// this classloader is used only to load jaxb.properties, so doing this should be safe.
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ClassLoader classLoader = getClassClassLoader(c);
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Package pkg = c.getPackage();
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if(pkg==null)
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continue; // this is possible for primitives, arrays, and classes that are loaded by poorly implemented ClassLoaders
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String packageName = pkg.getName().replace('.', '/');
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// TODO: do we want to optimize away searching the same package? org.Foo, org.Bar, com.Baz
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// classes from the same package might come from different class loades, so it might be a bad idea
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// TODO: it's easier to look things up from the class
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// c.getResourceAsStream("jaxb.properties");
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// build the resource name and use the property loader code
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String resourceName = packageName+"/jaxb.properties";
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logger.log(Level.FINE, "Trying to locate {0}", resourceName);
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Properties props = loadJAXBProperties(classLoader, resourceName);
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if (props == null) {
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logger.fine(" not found");
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} else {
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logger.fine(" found");
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if (props.containsKey(JAXB_CONTEXT_FACTORY)) {
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// trim() seems redundant, but adding to satisfy customer complaint
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factoryClassName = props.getProperty(JAXB_CONTEXT_FACTORY).trim();
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return newInstance(classes, properties, factoryClassName);
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} else {
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throw new JAXBException(Messages.format(Messages.MISSING_PROPERTY, packageName, JAXB_CONTEXT_FACTORY));
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}
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}
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}
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// search for a system property second (javax.xml.bind.JAXBContext)
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logger.log(Level.FINE, "Checking system property {0}", JAXBContext.JAXB_CONTEXT_FACTORY);
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factoryClassName = AccessController.doPrivileged(new GetPropertyAction(JAXBContext.JAXB_CONTEXT_FACTORY));
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if (factoryClassName != null) {
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logger.log(Level.FINE, " found {0}", factoryClassName);
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return newInstance( classes, properties, factoryClassName );
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} else { // leave it here for compatibility reasons
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logger.fine(" not found");
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logger.log(Level.FINE, "Checking system property {0}", jaxbContextFQCN);
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factoryClassName = AccessController.doPrivileged(new GetPropertyAction(jaxbContextFQCN));
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if (factoryClassName != null) {
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|
398 |
logger.log(Level.FINE, " found {0}", factoryClassName);
|
|
399 |
return newInstance( classes, properties, factoryClassName );
|
|
400 |
} else {
|
|
401 |
logger.fine(" not found");
|
|
402 |
}
|
|
403 |
}
|
|
404 |
|
|
405 |
Class factory = lookupUsingOSGiServiceLoader("javax.xml.bind.JAXBContext");
|
|
406 |
if (factory != null) {
|
|
407 |
logger.fine("OSGi environment detected");
|
|
408 |
return newInstance(classes, properties, factory);
|
|
409 |
}
|
|
410 |
|
|
411 |
// search META-INF services next
|
|
412 |
logger.fine("Checking META-INF/services");
|
|
413 |
BufferedReader r;
|
|
414 |
try {
|
|
415 |
final String resource = new StringBuilder("META-INF/services/").append(jaxbContextFQCN).toString();
|
|
416 |
ClassLoader classLoader = getContextClassLoader();
|
|
417 |
URL resourceURL;
|
|
418 |
if(classLoader==null)
|
|
419 |
resourceURL = ClassLoader.getSystemResource(resource);
|
|
420 |
else
|
|
421 |
resourceURL = classLoader.getResource(resource);
|
|
422 |
|
|
423 |
if (resourceURL != null) {
|
|
424 |
logger.log(Level.FINE, "Reading {0}", resourceURL);
|
|
425 |
r = new BufferedReader(new InputStreamReader(resourceURL.openStream(), "UTF-8"));
|
|
426 |
factoryClassName = r.readLine().trim();
|
|
427 |
return newInstance(classes, properties, factoryClassName);
|
|
428 |
} else {
|
|
429 |
logger.log(Level.FINE, "Unable to find: {0}", resource);
|
|
430 |
}
|
|
431 |
} catch (UnsupportedEncodingException e) {
|
|
432 |
// should never happen
|
|
433 |
throw new JAXBException(e);
|
|
434 |
} catch (IOException e) {
|
|
435 |
throw new JAXBException(e);
|
|
436 |
}
|
|
437 |
|
|
438 |
// else no provider found
|
|
439 |
logger.fine("Trying to create the platform default provider");
|
|
440 |
return newInstance(classes, properties, PLATFORM_DEFAULT_FACTORY_CLASS);
|
|
441 |
}
|
|
442 |
|
|
443 |
private static Class lookupUsingOSGiServiceLoader(String factoryId) {
|
|
444 |
try {
|
|
445 |
// Use reflection to avoid having any dependendcy on ServiceLoader class
|
|
446 |
Class serviceClass = Class.forName(factoryId);
|
|
447 |
Class target = Class.forName("com.sun.org.glassfish.hk2.osgiresourcelocator.ServiceLoader");
|
|
448 |
Method m = target.getMethod("lookupProviderClasses", Class.class);
|
|
449 |
Iterator iter = ((Iterable) m.invoke(null, serviceClass)).iterator();
|
|
450 |
return iter.hasNext() ? (Class)iter.next() : null;
|
|
451 |
} catch(Exception e) {
|
|
452 |
logger.log(Level.FINE, "Unable to find from OSGi: {0}", factoryId);
|
|
453 |
return null;
|
|
454 |
}
|
|
455 |
}
|
|
456 |
|
|
457 |
private static Properties loadJAXBProperties( ClassLoader classLoader,
|
|
458 |
String propFileName )
|
|
459 |
throws JAXBException {
|
|
460 |
|
|
461 |
Properties props = null;
|
|
462 |
|
|
463 |
try {
|
|
464 |
URL url;
|
|
465 |
if(classLoader==null)
|
|
466 |
url = ClassLoader.getSystemResource(propFileName);
|
|
467 |
else
|
|
468 |
url = classLoader.getResource( propFileName );
|
|
469 |
|
|
470 |
if( url != null ) {
|
|
471 |
logger.log(Level.FINE, "loading props from {0}", url);
|
|
472 |
props = new Properties();
|
|
473 |
InputStream is = url.openStream();
|
|
474 |
props.load( is );
|
|
475 |
is.close();
|
|
476 |
}
|
|
477 |
} catch( IOException ioe ) {
|
|
478 |
logger.log(Level.FINE,"Unable to load "+propFileName,ioe);
|
|
479 |
throw new JAXBException( ioe.toString(), ioe );
|
|
480 |
}
|
|
481 |
|
|
482 |
return props;
|
|
483 |
}
|
|
484 |
|
|
485 |
|
|
486 |
/**
|
|
487 |
* Search the given ClassLoader for an instance of the specified class and
|
|
488 |
* return a string representation of the URL that points to the resource.
|
|
489 |
*
|
|
490 |
* @param clazz
|
|
491 |
* The class to search for
|
|
492 |
* @param loader
|
|
493 |
* The ClassLoader to search. If this parameter is null, then the
|
|
494 |
* system class loader will be searched
|
|
495 |
* @return
|
|
496 |
* the URL for the class or null if it wasn't found
|
|
497 |
*/
|
|
498 |
static URL which(Class clazz, ClassLoader loader) {
|
|
499 |
|
|
500 |
String classnameAsResource = clazz.getName().replace('.', '/') + ".class";
|
|
501 |
|
|
502 |
if(loader == null) {
|
|
503 |
loader = ClassLoader.getSystemClassLoader();
|
|
504 |
}
|
|
505 |
|
|
506 |
return loader.getResource(classnameAsResource);
|
|
507 |
}
|
|
508 |
|
|
509 |
/**
|
|
510 |
* Get the URL for the Class from it's ClassLoader.
|
|
511 |
*
|
|
512 |
* Convenience method for {@link #which(Class, ClassLoader)}.
|
|
513 |
*
|
|
514 |
* Equivalent to calling: which(clazz, clazz.getClassLoader())
|
|
515 |
*
|
|
516 |
* @param clazz
|
|
517 |
* The class to search for
|
|
518 |
* @return
|
|
519 |
* the URL for the class or null if it wasn't found
|
|
520 |
*/
|
|
521 |
static URL which(Class clazz) {
|
|
522 |
return which(clazz, getClassClassLoader(clazz));
|
|
523 |
}
|
|
524 |
|
|
525 |
/**
|
|
526 |
* When JAXB is in J2SE, rt.jar has to have a JAXB implementation.
|
|
527 |
* However, rt.jar cannot have META-INF/services/javax.xml.bind.JAXBContext
|
|
528 |
* because if it has, it will take precedence over any file that applications have
|
|
529 |
* in their jar files.
|
|
530 |
*
|
|
531 |
* <p>
|
|
532 |
* When the user bundles his own JAXB implementation, we'd like to use it, and we
|
|
533 |
* want the platform default to be used only when there's no other JAXB provider.
|
|
534 |
*
|
|
535 |
* <p>
|
|
536 |
* For this reason, we have to hard-code the class name into the API.
|
|
537 |
*/
|
|
538 |
private static final String PLATFORM_DEFAULT_FACTORY_CLASS = "com.sun.xml.internal.bind.v2.ContextFactory";
|
|
539 |
|
|
540 |
/**
|
|
541 |
* Loads the class, provided that the calling thread has an access to the class being loaded.
|
|
542 |
*/
|
|
543 |
private static Class safeLoadClass(String className, ClassLoader classLoader) throws ClassNotFoundException {
|
|
544 |
logger.log(Level.FINE, "Trying to load {0}", className);
|
|
545 |
try {
|
|
546 |
// make sure that the current thread has an access to the package of the given name.
|
|
547 |
SecurityManager s = System.getSecurityManager();
|
|
548 |
if (s != null) {
|
|
549 |
int i = className.lastIndexOf('.');
|
|
550 |
if (i != -1) {
|
|
551 |
s.checkPackageAccess(className.substring(0,i));
|
|
552 |
}
|
|
553 |
}
|
|
554 |
|
|
555 |
if (classLoader == null) {
|
|
556 |
return Class.forName(className);
|
|
557 |
} else {
|
|
558 |
return classLoader.loadClass(className);
|
|
559 |
}
|
|
560 |
} catch (SecurityException se) {
|
|
561 |
// anyone can access the platform default factory class without permission
|
|
562 |
if (PLATFORM_DEFAULT_FACTORY_CLASS.equals(className)) {
|
|
563 |
return Class.forName(className);
|
|
564 |
}
|
|
565 |
throw se;
|
|
566 |
}
|
|
567 |
}
|
|
568 |
|
|
569 |
private static ClassLoader getContextClassLoader() {
|
|
570 |
if (System.getSecurityManager() == null) {
|
|
571 |
return Thread.currentThread().getContextClassLoader();
|
|
572 |
} else {
|
|
573 |
return (ClassLoader) java.security.AccessController.doPrivileged(
|
|
574 |
new java.security.PrivilegedAction() {
|
|
575 |
public java.lang.Object run() {
|
|
576 |
return Thread.currentThread().getContextClassLoader();
|
|
577 |
}
|
|
578 |
});
|
|
579 |
}
|
|
580 |
}
|
|
581 |
|
|
582 |
private static ClassLoader getClassClassLoader(final Class c) {
|
|
583 |
if (System.getSecurityManager() == null) {
|
|
584 |
return c.getClassLoader();
|
|
585 |
} else {
|
|
586 |
return (ClassLoader) java.security.AccessController.doPrivileged(
|
|
587 |
new java.security.PrivilegedAction() {
|
|
588 |
public java.lang.Object run() {
|
|
589 |
return c.getClassLoader();
|
|
590 |
}
|
|
591 |
});
|
|
592 |
}
|
|
593 |
}
|
|
594 |
|
|
595 |
}
|