/*
* 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.as.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.as.cmp.bridge.SelectorBridge;
import org.jboss.as.cmp.component.CmpEntityBeanComponent;
import org.jboss.as.cmp.context.CmpEntityBeanContext;
import org.jboss.as.cmp.jdbc.JDBCQueryCommand;
import org.jboss.as.cmp.jdbc.JDBCStoreManager;
import org.jboss.as.cmp.jdbc.metadata.JDBCQueryMetaData;
/**
* 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;
CmpEntityBeanComponent component = manager.getComponent();
tm = component.getTransactionManager();
syncBeforeSelect = !manager.getCmpConfig().isSyncOnCommitOnly();
}
// BridgeInvoker implementation
public Object invoke(CmpEntityBeanContext ctx, Method method, Object[] args) throws Exception {
Transaction tx = (ctx != null ? ctx.getTransaction() : tm.getTransaction());
if (syncBeforeSelect) {
manager.getComponent().synchronizeEntitiesWithinTransaction(tx);
}
return execute(ctx, 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(CmpEntityBeanContext ctx, Object[] args) throws FinderException {
Collection retVal;
Method method = getMethod();
try {
JDBCQueryCommand query = manager.getQueryManager().getQueryCommand(method);
final CmpEntityBeanComponent selectedComponent = query.getSelectManager().getComponent();
JDBCQueryCommand.EntityProxyFactory factory = new JDBCQueryCommand.EntityProxyFactory() {
public Object getEntityObject(Object primaryKey) {
return queryMetaData.isResultTypeMappingLocal() && selectedComponent.getLocalHomeClass() != null ?
selectedComponent.getEJBLocalObject(primaryKey) : selectedComponent.getEJBObject(primaryKey);
}
};
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;
}
}
}
}