ohair@286: /*
ohair@286:  * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package javax.xml.soap;
ohair@286: 
ohair@286: import java.io.*;
ohair@286: import java.util.Properties;
ohair@286: 
ohair@286: 
ohair@286: class FactoryFinder {
ohair@286: 
ohair@286:     /**
ohair@286:      * Creates an instance of the specified class using the specified
ohair@286:      * <code>ClassLoader</code> object.
ohair@286:      *
ohair@286:      * @exception SOAPException if the given class could not be found
ohair@286:      *            or could not be instantiated
ohair@286:      */
ohair@286:     private static Object newInstance(String className,
ohair@286:                                       ClassLoader classLoader)
ohair@286:         throws SOAPException
ohair@286:     {
ohair@286:         try {
ohair@286:             Class spiClass;
ohair@286:             if (classLoader == null) {
ohair@286:                 spiClass = Class.forName(className);
ohair@286:             } else {
ohair@286:                 spiClass = classLoader.loadClass(className);
ohair@286:             }
ohair@286:             return spiClass.newInstance();
ohair@286:         } catch (ClassNotFoundException x) {
ohair@286:             throw new SOAPException(
ohair@286:                 "Provider " + className + " not found", x);
ohair@286:         } catch (Exception x) {
ohair@286:             throw new SOAPException(
ohair@286:                 "Provider " + className + " could not be instantiated: " + x,
ohair@286:                 x);
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * Finds the implementation <code>Class</code> object for the given
ohair@286:      * factory name, or null if that fails.
ohair@286:      * <P>
ohair@286:      * This method is package private so that this code can be shared.
ohair@286:      *
ohair@286:      * @return the <code>Class</code> object of the specified message factory;
ohair@286:      *         or <code>null</code>
ohair@286:      *
ohair@286:      * @param factoryId             the name of the factory to find, which is
ohair@286:      *                              a system property
ohair@286:      * @exception SOAPException if there is a SOAP error
ohair@286:      */
ohair@286:     static Object find(String factId)
ohair@286:         throws SOAPException
ohair@286:     {
ohair@286:         final ClassLoader classLoader;
ohair@286:         final String factoryId = factId;
ohair@286:         try {
ohair@286:             classLoader = Thread.currentThread().getContextClassLoader();
ohair@286:         } catch (Exception x) {
ohair@286:             throw new SOAPException(x.toString(), x);
ohair@286:         }
ohair@286: 
ohair@286:         // Use the system property first
ohair@286:         try {
ohair@286:             String systemProp =
ohair@286:                 System.getProperty( factoryId );
ohair@286:             if( systemProp!=null) {
ohair@286:                 return newInstance(systemProp, classLoader);
ohair@286:             }
ohair@286:         } catch (SecurityException se) {
ohair@286:         }
ohair@286: 
ohair@286:         // try to read from $java.home/lib/jaxm.properties
ohair@286:         try {
ohair@286:             String javah=System.getProperty( "java.home" );
ohair@286:             String configFile = javah + File.separator +
ohair@286:                 "lib" + File.separator + "jaxm.properties";
ohair@286:             final File f=new File( configFile );
ohair@286:             if( f.exists()) {
ohair@286:                 Properties props=new Properties();
ohair@286:                 props.load( new FileInputStream(f));
ohair@286:                 String factoryClassName = props.getProperty(factoryId);
ohair@286:                 return newInstance(factoryClassName, classLoader);
ohair@286:             }
ohair@286:         } catch(Exception ex ) {
ohair@286:         }
ohair@286: 
ohair@286:         String serviceId = "META-INF/services/" + factoryId;
ohair@286:         // try to find services in CLASSPATH
ohair@286:         try {
ohair@286:             InputStream is=null;
ohair@286:             if (classLoader == null) {
ohair@286:                 is=ClassLoader.getSystemResourceAsStream(serviceId);
ohair@286:             } else {
ohair@286:                 is=classLoader.getResourceAsStream(serviceId);
ohair@286:             }
ohair@286: 
ohair@286:             if( is!=null ) {
ohair@286:                 BufferedReader rd =
ohair@286:                     new BufferedReader(new InputStreamReader(is, "UTF-8"));
ohair@286: 
ohair@286:                 String factoryClassName = rd.readLine();
ohair@286:                 rd.close();
ohair@286: 
ohair@286:                 if (factoryClassName != null &&
ohair@286:                     ! "".equals(factoryClassName)) {
ohair@286:                     return newInstance(factoryClassName, classLoader);
ohair@286:                 }
ohair@286:             }
ohair@286:         } catch( Exception ex ) {
ohair@286:         }
ohair@286: 
ohair@286:         return null;
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * Finds the implementation <code>Class</code> object for the given
ohair@286:      * factory name, or if that fails, finds the <code>Class</code> object
ohair@286:      * for the given fallback class name. The arguments supplied must be
ohair@286:      * used in order. If using the first argument is successful, the second
ohair@286:      * one will not be used.
ohair@286:      * <P>
ohair@286:      * This method is package private so that this code can be shared.
ohair@286:      *
ohair@286:      * @return the <code>Class</code> object of the specified message factory;
ohair@286:      *         may not be <code>null</code>
ohair@286:      *
ohair@286:      * @param factoryId             the name of the factory to find, which is
ohair@286:      *                              a system property
ohair@286:      * @param fallbackClassName     the implementation class name, which is
ohair@286:      *                              to be used only if nothing else
ohair@286:      *                              is found; <code>null</code> to indicate that
ohair@286:      *                              there is no fallback class name
ohair@286:      * @exception SOAPException if there is a SOAP error
ohair@286:      */
ohair@286:     static Object find(String factoryId, String fallbackClassName)
ohair@286:         throws SOAPException
ohair@286:     {
ohair@286: 
ohair@286:         Object obj = find(factoryId);
ohair@286:         if (obj != null)
ohair@286:             return obj;
ohair@286: 
ohair@286:         ClassLoader classLoader;
ohair@286:         try {
ohair@286:             classLoader = Thread.currentThread().getContextClassLoader();
ohair@286:         } catch (Exception x) {
ohair@286:             throw new SOAPException(x.toString(), x);
ohair@286:         }
ohair@286: 
ohair@286:         if (fallbackClassName == null) {
ohair@286:             throw new SOAPException(
ohair@286:                 "Provider for " + factoryId + " cannot be found", null);
ohair@286:         }
ohair@286: 
ohair@286:         return newInstance(fallbackClassName, classLoader);
ohair@286:     }
ohair@286: }