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package javax.xml.ws.spi;

import java.io.*;

import java.util.Properties;
import javax.xml.ws.WebServiceException;

class FactoryFinder {

    /**
     * Creates an instance of the specified class using the specified 
     * ClassLoader object.
     *
     * @exception WebServiceException if the given class could not be found
     *            or could not be instantiated
     */
    private static Object newInstance(String className,
                                      ClassLoader classLoader)
    {
        try {
            Class spiClass = safeLoadClass(className, classLoader);
            return spiClass.newInstance();
        } catch (ClassNotFoundException x) {
            throw new WebServiceException(
                "Provider " + className + " not found", x);
        } catch (Exception x) {
            throw new WebServiceException(
                "Provider " + className + " could not be instantiated: " + x,
                x);
        }
    }

    /**
     * Finds the implementation Class object for the given
     * factory name, or if that fails, finds the Class object
     * for the given fallback class name. The arguments supplied MUST be
     * used in order. If using the first argument is successful, the second
     * one will not be used.
     * 

* This method is package private so that this code can be shared. * * @return the Class object of the specified message factory; * may not be null * * @param factoryId the name of the factory to find, which is * a system property * @param fallbackClassName the implementation class name, which is * to be used only if nothing else * is found; null to indicate that * there is no fallback class name * @exception WebServiceException if there is an error */ static Object find(String factoryId, String fallbackClassName) { if (isOsgi()) { return lookupUsingOSGiServiceLoader(factoryId); } ClassLoader classLoader; try { classLoader = Thread.currentThread().getContextClassLoader(); } catch (Exception x) { throw new WebServiceException(x.toString(), x); } String serviceId = "META-INF/services/" + factoryId; // try to find services in CLASSPATH BufferedReader rd = null; try { InputStream is; if (classLoader == null) { is=ClassLoader.getSystemResourceAsStream(serviceId); } else { is=classLoader.getResourceAsStream(serviceId); } if( is!=null ) { rd = new BufferedReader(new InputStreamReader(is, "UTF-8")); String factoryClassName = rd.readLine(); if (factoryClassName != null && ! "".equals(factoryClassName)) { return newInstance(factoryClassName, classLoader); } } } catch( Exception ignored) { } finally { close(rd); } // try to read from $java.home/lib/jaxws.properties FileInputStream inStream = null; try { String javah=System.getProperty( "java.home" ); String configFile = javah + File.separator + "lib" + File.separator + "jaxws.properties"; File f=new File( configFile ); if( f.exists()) { Properties props=new Properties(); inStream = new FileInputStream(f); props.load(inStream); String factoryClassName = props.getProperty(factoryId); return newInstance(factoryClassName, classLoader); } } catch(Exception ignored) { } finally { close(inStream); } // Use the system property try { String systemProp = System.getProperty( factoryId ); if( systemProp!=null) { return newInstance(systemProp, classLoader); } } catch (SecurityException ignored) { } if (fallbackClassName == null) { throw new WebServiceException( "Provider for " + factoryId + " cannot be found", null); } return newInstance(fallbackClassName, classLoader); } private static void close(Closeable closeable) { if (closeable != null) { try { closeable.close(); } catch (IOException ignored) { } } } /** * Loads the class, provided that the calling thread has an access to the class being loaded. */ private static Class safeLoadClass(String className, ClassLoader classLoader) throws ClassNotFoundException { try { // make sure that the current thread has an access to the package of the given name. SecurityManager s = System.getSecurityManager(); if (s != null) { int i = className.lastIndexOf('.'); if (i != -1) { s.checkPackageAccess(className.substring(0, i)); } } if (classLoader == null) return Class.forName(className); else return classLoader.loadClass(className); } catch (SecurityException se) { // anyone can access the platform default factory class without permission if (Provider.DEFAULT_JAXWSPROVIDER.equals(className)) return Class.forName(className); throw se; } } private static final String OSGI_SERVICE_LOADER_CLASS_NAME = "org.glassfish.hk2.osgiresourcelocator.ServiceLoader"; private static boolean isOsgi() { try { Class.forName(OSGI_SERVICE_LOADER_CLASS_NAME); return true; } catch (ClassNotFoundException ignored) { } return false; } private static Object lookupUsingOSGiServiceLoader(String factoryId) { try { // Use reflection to avoid having any dependendcy on ServiceLoader class Class serviceClass = Class.forName(factoryId); Class[] args = new Class[]{serviceClass}; Class target = Class.forName(OSGI_SERVICE_LOADER_CLASS_NAME); java.lang.reflect.Method m = target.getMethod("lookupProviderInstances", Class.class); java.util.Iterator iter = ((Iterable) m.invoke(null, (Object[]) args)).iterator(); return iter.hasNext() ? iter.next() : null; } catch (Exception ignored) { // log and continue return null; } } }





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