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;
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();
}
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);
}
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);
break;
case COLLECTION:
result = command.fetchCollection(schema, factory, args);
break;
default:
throw new IllegalStateException("Unexpected return type: " + returnType);
}
return result;
}
}