/*******************************************************************************
* Copyright (c) 1998, 2009 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.mappings.transformers;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import org.eclipse.persistence.exceptions.DescriptorException;
import org.eclipse.persistence.internal.helper.ClassConstants;
import org.eclipse.persistence.internal.helper.Helper;
import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.internal.security.PrivilegedGetMethodParameterTypes;
import org.eclipse.persistence.internal.security.PrivilegedMethodInvoker;
import org.eclipse.persistence.sessions.Session;
import org.eclipse.persistence.mappings.foundation.AbstractTransformationMapping;
/**
* @version $Header: MethodBasedFieldTransformer.java 18-sep-2006.16:20:59 gyorke Exp $
* @author mmacivor
* @since 10
* This class is used to preserve the old method of doing Field Transformations
* on a transformation mapping. It is used internally when the older API is used on
* a TransformationMapping, and handles doing invocations on the user's domain class
*/
public class MethodBasedFieldTransformer implements FieldTransformer {
protected transient Method fieldTransformationMethod;
protected String methodName;
protected AbstractTransformationMapping mapping;
public MethodBasedFieldTransformer(String methodName) {
this.methodName = methodName;
}
public void initialize(AbstractTransformationMapping mapping) {
this.mapping = mapping;
try {
// look for the zero-argument version first
fieldTransformationMethod = Helper.getDeclaredMethod(mapping.getDescriptor().getJavaClass(), methodName, new Class[0]);
} catch (Exception ex) {
try {
// if the zero-argument version is not there, look for the one-argument version
Class[] methodParameterTypes = new Class[1];
methodParameterTypes[0] = ClassConstants.PublicInterfaceSession_Class;
fieldTransformationMethod = Helper.getDeclaredMethod(mapping.getDescriptor().getJavaClass(), methodName, methodParameterTypes);
} catch (Exception ex2) {
try {
//if the one-argument version is absent, try with sessions.Session
Class[] methodParameterTypes = new Class[1];
methodParameterTypes[0] = ClassConstants.SessionsSession_Class;
fieldTransformationMethod = Helper.getDeclaredMethod(mapping.getDescriptor().getJavaClass(), methodName, methodParameterTypes);
} catch (NoSuchMethodException exception) {
throw DescriptorException.noSuchMethodWhileConvertingToMethod(methodName, mapping, exception);
} catch (SecurityException exception) {
throw DescriptorException.securityWhileConvertingToMethod(methodName, mapping, exception);
}
}
}
}
public Object buildFieldValue(Object object, String fieldName, Session session) {
Class[] parameterTypes = null;
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try{
parameterTypes = (Class [])AccessController.doPrivileged(new PrivilegedGetMethodParameterTypes(fieldTransformationMethod));
}catch (PrivilegedActionException ex){
throw (RuntimeException) ex.getCause();
}
}else{
parameterTypes = PrivilegedAccessHelper.getMethodParameterTypes(fieldTransformationMethod);
}
Object[] parameters = new Object[parameterTypes.length];
if (parameters.length == 1) {
parameters[0] = session;
}
try {
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try{
return AccessController.doPrivileged(new PrivilegedMethodInvoker(fieldTransformationMethod, object, parameters));
}catch (PrivilegedActionException ex){
if (ex.getCause() instanceof IllegalAccessException){
throw (IllegalAccessException) ex.getCause();
}
if (ex.getCause() instanceof InvocationTargetException){
throw (InvocationTargetException) ex.getCause();
}
throw (RuntimeException) ex.getCause();
}
}else{
return PrivilegedAccessHelper.invokeMethod(fieldTransformationMethod, object, parameters);
}
} catch (IllegalAccessException exception) {
throw DescriptorException.illegalAccessWhileInvokingFieldToMethod(fieldTransformationMethod.getName(), mapping, exception);
} catch (IllegalArgumentException exception) {
throw DescriptorException.illegalArgumentWhileInvokingFieldToMethod(fieldTransformationMethod.getName(), mapping, exception);
} catch (InvocationTargetException exception) {
throw DescriptorException.targetInvocationWhileInvokingFieldToMethod(fieldTransformationMethod.getName(), mapping, exception);
}
}
public String getMethodName() {
return methodName;
}
public void setMethodName(String name) {
methodName = name;
}
}