/*
* 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.jdbc2.bridge;
import org.jboss.ejb.plugins.cmp.bridge.SelectorBridge;
import org.jboss.ejb.plugins.cmp.jdbc2.QueryCommand;
import org.jboss.ejb.plugins.cmp.jdbc2.JDBCStoreManager2;
import org.jboss.ejb.plugins.cmp.jdbc2.schema.Schema;
import org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCQueryMetaData;
import org.jboss.ejb.EntityEnterpriseContext;
import org.jboss.ejb.EntityContainer;
import org.jboss.ejb.GenericEntityObjectFactory;
import javax.ejb.FinderException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import java.lang.reflect.Method;
import java.util.Collection;
/**
* @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
* @version <tt>$Revision: 81030 $</tt>
*/
public class EJBSelectBridge
implements SelectorBridge
{
private final static byte SINGLE = 0;
private final static byte COLLECTION = 2;
private final JDBCQueryMetaData metadata;
private final QueryCommand command;
private final byte returnType;
private final Schema schema;
private boolean syncBeforeSelect;
private TransactionManager tm;
public EJBSelectBridge(EntityContainer container, Schema schema, JDBCQueryMetaData metadata, QueryCommand command)
{
this.schema = schema;
this.metadata = metadata;
this.command = command;
Class type = metadata.getMethod().getReturnType();
if(Collection.class.isAssignableFrom(type))
{
returnType = COLLECTION;
}
else
{
returnType = SINGLE;
}
tm = container.getTransactionManager();
syncBeforeSelect = !container.getBeanMetaData().getContainerConfiguration().getSyncOnCommitOnly();
}
// BridgeInvoker implementation
public Object invoke(EntityEnterpriseContext instance, Method method, Object[] args)
throws Exception
{
Transaction tx = (instance != null ? instance.getTransaction() : tm.getTransaction());
if(syncBeforeSelect)
{
EntityContainer.synchronizeEntitiesWithinTransaction(tx);
}
return execute(args);
}
// SelectorBridge implementation
public String getSelectorName()
{
return metadata.getMethod().getName();
}
public Method getMethod()
{
return metadata.getMethod();
}
public Object execute(Object[] args) throws FinderException
{
JDBCStoreManager2 manager = command.getStoreManager();
GenericEntityObjectFactory factory = (metadata.isResultTypeMappingLocal() ?
(GenericEntityObjectFactory)manager.getContainer().getLocalProxyFactory() : manager.getContainer().getProxyFactory());
Object result;
switch(returnType)
{
case SINGLE:
result = command.fetchOne(schema, factory, args);
if(result == null && getMethod().getReturnType().isPrimitive())
{
throw new FinderException(
"Cannot return null as a value of primitive type " + getMethod().getReturnType().getName()
);
}
break;
case COLLECTION:
result = command.fetchCollection(schema, factory, args);
break;
default:
throw new IllegalStateException("Unexpected return type: " + returnType);
}
return result;
}
}