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237 lines
8.5 KiB
237 lines
8.5 KiB
/*
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* Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.xml.soap;
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import java.io.*;
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import java.util.Properties;
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class FactoryFinder {
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/**
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* Creates an instance of the specified class using the specified
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* <code>ClassLoader</code> object.
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*
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* @exception SOAPException if the given class could not be found
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* or could not be instantiated
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*/
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private static Object newInstance(String className,
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ClassLoader classLoader)
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throws SOAPException
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{
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try {
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Class spiClass = safeLoadClass(className, classLoader);
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return spiClass.newInstance();
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} catch (ClassNotFoundException x) {
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throw new SOAPException("Provider " + className + " not found", x);
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} catch (Exception x) {
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throw new SOAPException("Provider " + className + " could not be instantiated: " + x, x);
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}
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}
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/**
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* Finds the implementation <code>Class</code> object for the given
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* factory name, or null if that fails.
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* <P>
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* This method is package private so that this code can be shared.
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*
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* @return the <code>Class</code> object of the specified message factory;
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* or <code>null</code>
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*
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* @param factoryId the name of the factory to find, which is
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* a system property
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* @exception SOAPException if there is a SOAP error
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*/
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static Object find(String factoryId)
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throws SOAPException
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{
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return find(factoryId, null, false);
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}
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/**
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* Finds the implementation <code>Class</code> object for the given
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* factory name, or if that fails, finds the <code>Class</code> object
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* for the given fallback class name. The arguments supplied must be
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* used in order. If using the first argument is successful, the second
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* one will not be used.
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* <P>
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* This method is package private so that this code can be shared.
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*
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* @return the <code>Class</code> object of the specified message factory;
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* may be <code>null</code>
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*
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* @param factoryId the name of the factory to find, which is
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* a system property
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* @param fallbackClassName the implementation class name, which is
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* to be used only if nothing else
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* is found; <code>null</code> to indicate that
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* there is no fallback class name
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* @exception SOAPException if there is a SOAP error
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*/
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static Object find(String factoryId, String fallbackClassName)
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throws SOAPException
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{
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return find(factoryId, fallbackClassName, true);
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}
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/**
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* Finds the implementation <code>Class</code> object for the given
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* factory name, or if that fails, finds the <code>Class</code> object
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* for the given default class name, but only if <code>tryFallback</code>
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* is <code>true</code>. The arguments supplied must be used in order
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* If using the first argument is successful, the second one will not
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* be used. Note the default class name may be needed even if fallback
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* is not to be attempted, so certain error conditions can be handled.
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* <P>
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* This method is package private so that this code can be shared.
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*
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* @return the <code>Class</code> object of the specified message factory;
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* may not be <code>null</code>
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*
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* @param factoryId the name of the factory to find, which is
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* a system property
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* @param defaultClassName the implementation class name, which is
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* to be used only if nothing else
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* is found; <code>null</code> to indicate
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* that there is no default class name
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* @param tryFallback whether to try the default class as a
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* fallback
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* @exception SOAPException if there is a SOAP error
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*/
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static Object find(String factoryId, String defaultClassName,
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boolean tryFallback) throws SOAPException {
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ClassLoader classLoader;
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try {
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classLoader = Thread.currentThread().getContextClassLoader();
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} catch (Exception x) {
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throw new SOAPException(x.toString(), x);
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}
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// Use the system property first
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try {
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String systemProp =
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System.getProperty( factoryId );
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if( systemProp!=null) {
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return newInstance(systemProp, classLoader);
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}
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} catch (SecurityException se) {
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}
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// try to read from $java.home/lib/jaxm.properties
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try {
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String javah=System.getProperty( "java.home" );
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String configFile = javah + File.separator +
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"lib" + File.separator + "jaxm.properties";
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File f=new File( configFile );
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if( f.exists()) {
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Properties props=new Properties();
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props.load( new FileInputStream(f));
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String factoryClassName = props.getProperty(factoryId);
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return newInstance(factoryClassName, classLoader);
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}
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} catch(Exception ex ) {
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}
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String serviceId = "META-INF/services/" + factoryId;
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// try to find services in CLASSPATH
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try {
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InputStream is=null;
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if (classLoader == null) {
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is=ClassLoader.getSystemResourceAsStream(serviceId);
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} else {
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is=classLoader.getResourceAsStream(serviceId);
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}
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if( is!=null ) {
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BufferedReader rd =
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new BufferedReader(new InputStreamReader(is, "UTF-8"));
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String factoryClassName = rd.readLine();
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rd.close();
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if (factoryClassName != null &&
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! "".equals(factoryClassName)) {
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return newInstance(factoryClassName, classLoader);
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}
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}
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} catch( Exception ex ) {
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}
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// If not found and fallback should not be tried, return a null result.
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if (!tryFallback)
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return null;
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// We didn't find the class through the usual means so try the default
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// (built in) factory if specified.
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if (defaultClassName == null) {
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throw new SOAPException(
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"Provider for " + factoryId + " cannot be found", null);
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}
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return newInstance(defaultClassName, classLoader);
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}
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/**
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* Loads the class, provided that the calling thread has an access to the
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* class being loaded. If this is the specified default factory class and it
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* is restricted by package.access we get a SecurityException and can do a
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* Class.forName() on it so it will be loaded by the bootstrap class loader.
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*/
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private static Class safeLoadClass(String className,
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ClassLoader classLoader)
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throws ClassNotFoundException {
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try {
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// make sure that the current thread has an access to the package of the given name.
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SecurityManager s = System.getSecurityManager();
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if (s != null) {
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int i = className.lastIndexOf('.');
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if (i != -1) {
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s.checkPackageAccess(className.substring(0, i));
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}
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}
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if (classLoader == null)
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return Class.forName(className);
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else
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return classLoader.loadClass(className);
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} catch (SecurityException se) {
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// (only) default implementation can be loaded
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// using bootstrap class loader:
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if (isDefaultImplementation(className))
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return Class.forName(className);
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throw se;
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}
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}
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private static boolean isDefaultImplementation(String className) {
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return MessageFactory.DEFAULT_MESSAGE_FACTORY.equals(className) ||
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SOAPFactory.DEFAULT_SOAP_FACTORY.equals(className) ||
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SOAPConnectionFactory.DEFAULT_SOAP_CONNECTION_FACTORY.equals(className) ||
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SAAJMetaFactory.DEFAULT_META_FACTORY_CLASS.equals(className);
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}
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}
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