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package oracle.toplink.essentials.platform.xml;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.internal.security.PrivilegedAccessHelper;
import oracle.toplink.essentials.internal.security.PrivilegedGetClassLoaderForClass;
import oracle.toplink.essentials.internal.security.PrivilegedNewInstanceFromClass;
public class XMLPlatformFactory {
public static final String XML_PLATFORM_PROPERTY = "toplink.xml.platform";
public static final String XDK_PLATFORM_CLASS_NAME = "oracle.toplink.essentials.platform.xml.xdk.XDKPlatform";
public static final String JAXP_PLATFORM_CLASS_NAME = "oracle.toplink.essentials.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 exc){
// will not be thrown
}
} else {
classLoader = PrivilegedAccessHelper.getClassLoaderForClass(this.getClass());
}
// ClassLoader classLoader = ClassLoader.getSystemClassLoader();
// ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
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 exception) {
Exception throwableException = exception.getException();
if (throwableException instanceof InstantiationException) {
throw XMLPlatformException.xmlPlatformCouldNotInstantiate(getXMLPlatformClass().getName(), throwableException);
} else {
throw XMLPlatformException.xmlPlatformCouldNotInstantiate(getXMLPlatformClass().getName(), throwableException);
}
}
} else {
return (XMLPlatform)PrivilegedAccessHelper.newInstanceFromClass(getXMLPlatformClass());
}
} catch (IllegalAccessException e) {
throw XMLPlatformException.xmlPlatformCouldNotInstantiate(getXMLPlatformClass().getName(), e);
} catch (InstantiationException e) {
throw XMLPlatformException.xmlPlatformCouldNotInstantiate(getXMLPlatformClass().getName(), e);
}
}
}