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/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package javax.xml.ws.spi;
// $Id: ProviderLoader.java 4632 2007-09-26 13:11:47Z heiko.braun@jboss.com $
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Properties;
/**
* Load the provider using the following algorithm.
*
* 1. If a resource with the name of META-INF/services/javax.xml.ws.spi.Provider exists, then
* its first line, if present, is used as the UTF-8 encoded name of the implementation class.
*
* 2. If the ${java.home}/lib/jaxws.properties file exists and it is readable by the
* java.util.Properties.load(InputStream) method and it contains an entry whose key is
* javax.xml.ws.spi.Provider, then the value of that entry is used as the name of the implementation class.
*
* 3. If a system property with the name javax.xml.ws.spi.Provider is defined, then its value is used
* as the name of the implementation class.
*
* 4. Finally, a default implementation class name is used.
*
* @author Thomas.Diesler@jboss.com
* @since 03-May-2006
*/
abstract class ProviderLoader
{
/**
* This method uses the algirithm described above.
*
* 1. If a resource with the name of META-INF/services/javax.xml.ws.spi.Provider exists, then
* its first line, if present, is used as the UTF-8 encoded name of the implementation class.
*
* 2. If the ${java.home}/lib/jaxws.properties file exists and it is readable by the
* java.util.Properties.load(InputStream) method and it contains an entry whose key is
* javax.xml.ws.spi.Provider, then the value of that entry is used as the name of the implementation class.
*
* 3. If a system property with the name javax.xml.ws.spi.Provider is defined, then its value is used
* as the name of the implementation class.
*
* 4. Finally, a default implementation class name is used.
*/
public static Provider loadProvider(String defaultFactory)
{
Object factory = null;
String factoryName = null;
ClassLoader loader = Thread.currentThread().getContextClassLoader();
// Use the Services API (as detailed in the JAR specification), if available, to determine the classname.
String propertyName = Provider.JAXWSPROVIDER_PROPERTY;
String filename = "META-INF/services/" + propertyName;
InputStream inStream = loader.getResourceAsStream(filename);
if (inStream != null)
{
try
{
BufferedReader br = new BufferedReader(new InputStreamReader(inStream, "UTF-8"));
factoryName = br.readLine();
br.close();
if (factoryName != null)
{
Class factoryClass = loader.loadClass(factoryName);
factory = factoryClass.newInstance();
}
}
catch (Throwable t)
{
throw new IllegalStateException("Failed to load " + propertyName + ": " + factoryName, t);
}
}
// Use the properties file "lib/jaxws.properties" in the JRE directory.
// This configuration file is in standard java.util.Properties format and contains the fully qualified name of the implementation class with the key being the system property defined above.
if (factory == null)
{
PrivilegedAction action = new PropertyAccessAction("java.home");
String javaHome = (String)AccessController.doPrivileged(action);
File jaxmFile = new File(javaHome + "/lib/jaxws.properties");
if (jaxmFile.exists())
{
try
{
action = new PropertyFileAccessAction(jaxmFile.getCanonicalPath());
Properties jaxmProperties = (Properties)AccessController.doPrivileged(action);
factoryName = jaxmProperties.getProperty(propertyName);
if (factoryName != null)
{
//if(log.isDebugEnabled()) log.debug("Load from " + jaxmFile + ": " + factoryName);
Class factoryClass = loader.loadClass(factoryName);
factory = factoryClass.newInstance();
}
}
catch (Throwable t)
{
throw new IllegalStateException("Failed to load " + propertyName + ": " + factoryName, t);
}
}
}
// Use system property
if (factory == null)
{
PrivilegedAction action = new PropertyAccessAction(propertyName);
factoryName = (String)AccessController.doPrivileged(action);
if (factoryName != null)
{
try
{
//if(log.isDebugEnabled()) log.debug("Load from system property: " + factoryName);
Class factoryClass = loader.loadClass(factoryName);
factory = factoryClass.newInstance();
}
catch (Throwable t)
{
throw new IllegalStateException("Failed to load " + propertyName + ": " + factoryName, t);
}
}
}
// Use the default factory implementation class.
if (factory == null && defaultFactory != null)
{
try
{
//if(log.isDebugEnabled()) log.debug("Load from default: " + factoryName);
Class factoryClass = loader.loadClass(defaultFactory);
factory = factoryClass.newInstance();
}
catch (Throwable t)
{
throw new IllegalStateException("Failed to load: " + defaultFactory, t);
}
}
return (Provider)factory;
}
private static class PropertyAccessAction implements PrivilegedAction
{
private String name;
PropertyAccessAction(String name)
{
this.name = name;
}
public Object run()
{
return System.getProperty(name);
}
}
private static class PropertyFileAccessAction implements PrivilegedAction
{
private String filename;
PropertyFileAccessAction(String filename)
{
this.filename = filename;
}
public Object run()
{
try
{
InputStream inStream = new FileInputStream(filename);
Properties props = new Properties();
props.load(inStream);
return props;
}
catch (IOException ex)
{
throw new SecurityException("Cannot load properties: " + filename, ex);
}
}
}
}
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