/*
* 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.ejb.plugins.cmp.jdbc.bridge;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import javax.ejb.EJBException;
import javax.ejb.FinderException;
import javax.ejb.ObjectNotFoundException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import org.jboss.ejb.plugins.cmp.bridge.SelectorBridge;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCQueryCommand;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager;
import org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCQueryMetaData;
import org.jboss.ejb.EntityEnterpriseContext;
import org.jboss.ejb.EntityContainer;
import org.jboss.ejb.GenericEntityObjectFactory;
/**
* JDBCSelectorBridge represents one ejbSelect method.
* <p/>
* Life-cycle:
* Tied to the EntityBridge.
* <p/>
* Multiplicity:
* One for each entity bean ejbSelect method.
*
* @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
* @version $Revision: 81030 $
*/
public class JDBCSelectorBridge implements SelectorBridge
{
private final JDBCQueryMetaData queryMetaData;
private final JDBCStoreManager manager;
private TransactionManager tm;
private boolean syncBeforeSelect;
public JDBCSelectorBridge(JDBCStoreManager manager, JDBCQueryMetaData queryMetaData)
{
this.queryMetaData = queryMetaData;
this.manager = manager;
EntityContainer container = manager.getContainer();
tm = container.getTransactionManager();
syncBeforeSelect = !container.getBeanMetaData().getContainerConfiguration().getSyncOnCommitOnly();
}
// BridgeInvoker implementation
public Object invoke(EntityEnterpriseContext ctx, Method method, Object[] args)
throws Exception
{
Transaction tx = (ctx != null ? ctx.getTransaction() : tm.getTransaction());
if(syncBeforeSelect)
{
EntityContainer.synchronizeEntitiesWithinTransaction(tx);
}
return execute(args);
}
// SelectorBridge implementation
public String getSelectorName()
{
return queryMetaData.getMethod().getName();
}
public Method getMethod()
{
return queryMetaData.getMethod();
}
private Class getReturnType()
{
return queryMetaData.getMethod().getReturnType();
}
public Object execute(Object[] args) throws FinderException
{
Collection retVal;
Method method = getMethod();
try
{
JDBCQueryCommand query = manager.getQueryManager().getQueryCommand(method);
EntityContainer selectedContainer = query.getSelectManager().getContainer();
GenericEntityObjectFactory factory;
if(queryMetaData.isResultTypeMappingLocal() && selectedContainer.getLocalHomeClass() != null)
{
factory = selectedContainer.getLocalProxyFactory();
}
else
{
factory = selectedContainer.getProxyFactory();
}
retVal = query.execute(method, args, null, factory);
}
catch(FinderException e)
{
throw e;
}
catch(EJBException e)
{
throw e;
}
catch(Exception e)
{
throw new EJBException("Error in " + getSelectorName(), e);
}
if(!Collection.class.isAssignableFrom(getReturnType()))
{
// single object
if(retVal.size() == 0)
{
throw new ObjectNotFoundException();
}
if(retVal.size() > 1)
{
throw new FinderException(getSelectorName() +
" returned " + retVal.size() + " objects");
}
Object o = retVal.iterator().next();
if(o == null && method.getReturnType().isPrimitive())
{
throw new FinderException(
"Cannot return null as a value of primitive type " + method.getReturnType().getName()
);
}
return o;
}
else
{
// collection or set
if(Set.class.isAssignableFrom(getReturnType()))
{
return new HashSet(retVal);
}
else
{
return retVal;
}
}
}
}