/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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 org.jboss.mx.interceptor;
import java.lang.reflect.Method;
import javax.management.Descriptor;
import javax.management.InvalidAttributeValueException;
import javax.management.MBeanException;
import javax.management.ServiceNotFoundException;
import javax.management.modelmbean.InvalidTargetObjectTypeException;
import org.jboss.mx.modelmbean.ModelMBeanConstants;
import org.jboss.mx.server.Invocation;
import org.jboss.mx.server.MBeanInvoker;
/** A dispatcher used by the AbstractMBeanInvoker class for the attribute
* getter and setter dispatch.
*
* @author Scott.Stark@jboss.org
* @version $Revision: 81026 $
*/
public class AttributeDispatcher
extends ReflectedDispatcher
{
private Method getter;
private Method setter;
public AttributeDispatcher(Method getter, Method setter, boolean dynamic)
{
super(dynamic);
setName("Attribute Dispatcher");
this.getter = getter;
this.setter = setter;
}
/** Dispatch the attribute set or get. A get is identified by a dispatch
* with a null args value.
*
* @return the result of the attribute accessor invocation
* @throws InvocationException
*/
public Object invoke(Invocation invocation) throws Throwable
{
Object target = invocation.getTarget();
Object value = null;
Object[] args = invocation.getArgs();
// Getter
if( args == null )
{
Method getMethod = getter;
if (dynamic)
{
Descriptor d = invocation.getDescriptor();
if (d != null)
{
Object descriptorTarget = d.getFieldValue(ModelMBeanConstants.TARGET_OBJECT);
if (descriptorTarget != null)
{
String targetType = (String) d.getFieldValue(ModelMBeanConstants.TARGET_TYPE);
if (ModelMBeanConstants.OBJECT_REF.equalsIgnoreCase(targetType) == false)
throw new InvalidTargetObjectTypeException("Target type is " + targetType);
target = descriptorTarget;
}
String getMethodString = (String) d.getFieldValue(ModelMBeanConstants.GET_METHOD);
if (getMethodString != null && (getMethod == null || getMethodString.equals(getMethod.getName()) == false))
{
MBeanInvoker invoker = invocation.getInvoker();
Object object = invoker.invoke(getMethodString, new Object[0], new String[0]);
checkAssignable(getMethodString, invocation.getAttributeTypeClass(), object);
return object;
}
}
}
if (target == null)
throw new MBeanException(new ServiceNotFoundException("No Target"));
try
{
value = getMethod.invoke(target, args);
}
catch (Throwable t)
{
handleInvocationExceptions(t);
return null;
}
}
// Setter
else
{
Method setMethod = setter;
if (dynamic)
{
Descriptor d = invocation.getDescriptor();
if (d != null)
{
Object descriptorTarget = d.getFieldValue(ModelMBeanConstants.TARGET_OBJECT);
if (descriptorTarget != null)
{
String targetType = (String) d.getFieldValue(ModelMBeanConstants.TARGET_TYPE);
if (ModelMBeanConstants.OBJECT_REF.equalsIgnoreCase(targetType) == false)
throw new InvalidTargetObjectTypeException("Target type is " + targetType);
target = descriptorTarget;
}
String setMethodString = (String) d.getFieldValue(ModelMBeanConstants.SET_METHOD);
if (setMethodString != null && (setMethod == null || setMethodString.equals(setMethod.getName()) == false))
{
MBeanInvoker invoker = invocation.getInvoker();
return invoker.invoke(setMethodString, new Object[] { args[0] }, new String[] { invocation.getAttributeType() });
}
}
}
if (target == null)
throw new MBeanException(new ServiceNotFoundException("No Target"));
try
{
value = setMethod.invoke(target, args);
}
catch (Throwable t)
{
handleInvocationExceptions(t);
return null;
}
}
return value;
}
protected void checkAssignable(String context, Class clazz, Object value) throws InvalidAttributeValueException, ClassNotFoundException
{
if (value != null && clazz.isAssignableFrom(value.getClass()) == false)
throw new InvalidAttributeValueException(context + " has class " + value.getClass() + " loaded from " + value.getClass().getClassLoader() +
" that is not assignable to attribute class " + clazz + " loaded from " + clazz.getClassLoader());
}
}