/*******************************************************************************
* Copyright (c) 1998, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.platform.xml;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.internal.security.PrivilegedGetClassLoaderForClass;
import org.eclipse.persistence.internal.security.PrivilegedNewInstanceFromClass;
public class XMLPlatformFactory {
public static final String XML_PLATFORM_PROPERTY = "eclipselink.xml.platform";
public static final String XDK_PLATFORM_CLASS_NAME = "org.eclipse.persistence.platform.xml.xdk.XDKPlatform";
public static final String JAXP_PLATFORM_CLASS_NAME = "org.eclipse.persistence.platform.xml.jaxp.JAXPPlatform";
private static XMLPlatformFactory instance;
private Class xmlPlatformClass;
private XMLPlatformFactory() {
super();
}
/**
* INTERNAL:
* Return the singleton instance of XMLPlatformContext.
* @return the the singleton instance of XMLPlatformContext.
* @throws XMLPlatformException
*/
public static XMLPlatformFactory getInstance() throws XMLPlatformException {
if (null == instance) {
instance = new XMLPlatformFactory();
}
return instance;
}
/**
* INTERNAL:
* Return the implementation class for the XMLPlatform.
* @return the implementation class for the XMLPlatform.
* @throws XMLPlatformException
*/
public Class getXMLPlatformClass() throws XMLPlatformException {
if (null != xmlPlatformClass) {
return xmlPlatformClass;
}
String newXMLPlatformClassName = System.getProperty(XML_PLATFORM_PROPERTY);
if (null == newXMLPlatformClassName) {
newXMLPlatformClassName = JAXP_PLATFORM_CLASS_NAME;
}
try {
ClassLoader classLoader = null;
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()) {
try {
classLoader = (ClassLoader)AccessController.doPrivileged(new PrivilegedGetClassLoaderForClass(this.getClass()));
} catch (PrivilegedActionException ex){
throw (RuntimeException) ex.getCause();
}
} else {
classLoader = PrivilegedAccessHelper.getClassLoaderForClass(this.getClass());
}
// Loader may be null if the class was loaded by the root loader in some JVM's/configs.
if (classLoader == null) {
classLoader = Thread.currentThread().getContextClassLoader();
}
if (classLoader == null) {
classLoader = ClassLoader.getSystemClassLoader();
}
Class newXMLPlatformClass = classLoader.loadClass(newXMLPlatformClassName);
setXMLPlatformClass(newXMLPlatformClass);
return xmlPlatformClass;
} catch (ClassNotFoundException e) {
throw XMLPlatformException.xmlPlatformClassNotFound(newXMLPlatformClassName, e);
}
}
/**
* PUBLIC:
* Set the implementation of XMLPlatform.
*/
public void setXMLPlatformClass(Class xmlPlatformClass) {
this.xmlPlatformClass = xmlPlatformClass;
}
/**
* INTERNAL:
* Return the XMLPlatform based on the toplink.xml.platform System property.
* @return an instance of XMLPlatform
* @throws XMLPlatformException
*/
public XMLPlatform getXMLPlatform() throws XMLPlatformException {
try {
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try{
return (XMLPlatform)AccessController.doPrivileged(new PrivilegedNewInstanceFromClass(getXMLPlatformClass()));
}catch (PrivilegedActionException ex){
throw (RuntimeException) ex.getCause();
}
}else{
return (XMLPlatform)PrivilegedAccessHelper.newInstanceFromClass(getXMLPlatformClass());
}
} catch (IllegalAccessException e) {
throw XMLPlatformException.xmlPlatformCouldNotInstantiate(getXMLPlatformClass().getName(), e);
} catch (InstantiationException e) {
throw XMLPlatformException.xmlPlatformCouldNotInstantiate(getXMLPlatformClass().getName(), e);
}
}
}