package org.apache.ojb.broker.metadata.fieldaccess;
/* Copyright 2003-2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import org.apache.commons.beanutils.DynaBean;
import org.apache.ojb.broker.PersistenceBrokerException;
import org.apache.ojb.broker.metadata.MetadataException;
import org.apache.ojb.broker.util.logging.Logger;
import org.apache.ojb.broker.util.logging.LoggerFactory;
/**
* A {@link org.apache.ojb.broker.metadata.fieldaccess.PersistentField} implementation accesses a property
* from a {@link org.apache.commons.beanutils.DynaBean}.
* Note that because of the way that PersistentField works,
* at run time the type of the field could actually be different, since
* it depends on the DynaClass of the DynaBean that is given at runtime.
* <p>
* This implementation does not support nested fields.
* </p>
*
* @version $Id: PersistentFieldDynaBeanImpl.java,v 1.8.2.2 2005/12/21 22:26:41 tomdz Exp $
*/
public class PersistentFieldDynaBeanImpl extends PersistentFieldBase
{
/*
TODO: Don't know if it is possible to support nested fields with DynaBeans. This
version does not support nested fields
*/
private static final long serialVersionUID = 4728858060905429509L;
public PersistentFieldDynaBeanImpl()
{
super();
}
public PersistentFieldDynaBeanImpl(Class aPropertyType, String aPropertyName)
{
super(aPropertyType, aPropertyName);
checkNested(aPropertyName);
}
public void set(Object anObject, Object aValue) throws MetadataException
{
if(anObject == null) return;
if (anObject instanceof DynaBean)
{
DynaBean dynaBean = (DynaBean) anObject;
try
{
dynaBean.set(getName(), aValue);
}
catch (Throwable t)
{
String msg = dynaBean.getClass().getName();
logSetProblem(anObject, aValue, msg);
throw new PersistenceBrokerException(t);
}
}
else
{
String msg = "the object is not a DynaBean";
logSetProblem(anObject, aValue, msg);
throw new PersistenceBrokerException(msg);
}
}
public Object get(Object anObject) throws MetadataException
{
if(anObject == null) return null;
if (anObject instanceof DynaBean)
{
DynaBean dynaBean = (DynaBean) anObject;
try
{
return dynaBean.get(getName());
}
catch (Throwable t)
{
String msg = dynaBean.getClass().getName();
logGetProblem(anObject, msg);
throw new PersistenceBrokerException(t);
}
}
else
{
String msg = "the object is not a DynaBean";
logGetProblem(anObject, msg);
throw new PersistenceBrokerException(msg);
}
}
private void checkNested(String fieldName)
{
if(fieldName.indexOf(PATH_TOKEN) > -1)
{
throw new MetadataException("This implementation does not support nested fields");
}
}
public Class getType()
{
return getDeclaringClass();
}
protected boolean makeAccessible()
{
return false;
}
public boolean usesAccessorsAndMutators()
{
return false;
}
/**
* Let's give the user some hints as to what could be wrong.
*/
protected void logSetProblem(Object anObject, Object aValue, String msg)
{
Logger logger = LoggerFactory.getDefaultLogger();
logger.error("Error in operation [set] of object [" + this.getClass().getName() + "], " + msg);
logger.error("Property Name [" + getName() + "]");
if (anObject instanceof DynaBean)
{
DynaBean dynaBean = (DynaBean) anObject;
logger.error("anObject was DynaClass [" + dynaBean.getDynaClass().getName() + "]");
}
else if (anObject != null)
{
logger.error("anObject was class [" + anObject.getClass().getName() + "]");
}
else
{
logger.error("anObject was null");
}
if (aValue != null)
logger.error("aValue was class [" + aValue.getClass().getName() + "]");
else
logger.error("aValue was null");
}
/**
* Let's give the user some hints as to what could be wrong.
*/
protected void logGetProblem(Object anObject, String msg)
{
Logger logger = LoggerFactory.getDefaultLogger();
logger.error("Error in operation [get of object [" + this.getClass().getName() + "], " + msg);
logger.error("Property Name [" + getName() + "]");
if (anObject instanceof DynaBean)
{
DynaBean dynaBean = (DynaBean) anObject;
logger.error("anObject was DynaClass [" + dynaBean.getDynaClass().getName() + "]");
}
else if (anObject != null)
{
logger.error("anObject was class [" + anObject.getClass().getName() + "]");
}
else
{
logger.error("anObject was null");
}
}
}