/*
* 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.jdbc2.bridge;
import java.lang.reflect.Method;
import java.util.Collection;
import javax.ejb.FinderException;
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.metadata.JDBCQueryMetaData;
import org.jboss.as.cmp.jdbc2.JDBCStoreManager2;
import org.jboss.as.cmp.jdbc2.QueryCommand;
import org.jboss.as.cmp.jdbc2.schema.Schema;
/**
* @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
* @version <tt>$Revision: 81030 $</tt>
*/
public class EJBSelectBridge implements SelectorBridge {
private static final byte SINGLE = 0;
private static final 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(final JDBCStoreManager2 manager, CmpEntityBeanComponent component, 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 = component.getTransactionManager();
syncBeforeSelect = !manager.getCmpConfig().isSyncOnCommitOnly();
}
// BridgeInvoker implementation
public Object invoke(CmpEntityBeanContext instance, Method method, Object[] args)
throws Exception {
Transaction tx = (instance != null ? instance.getTransaction() : tm.getTransaction());
if (syncBeforeSelect) {
instance.getComponent().synchronizeEntitiesWithinTransaction(tx);
}
return execute(instance, args);
}
// SelectorBridge implementation
public String getSelectorName() {
return metadata.getMethod().getName();
}
public Method getMethod() {
return metadata.getMethod();
}
public Object execute(CmpEntityBeanContext ctx, Object[] args) throws FinderException {
JDBCStoreManager2 manager = command.getStoreManager();
final CmpEntityBeanComponent selectedComponent = manager.getComponent();
JDBCQueryCommand.EntityProxyFactory factory = new JDBCQueryCommand.EntityProxyFactory() {
public Object getEntityObject(Object primaryKey) {
return metadata.isResultTypeMappingLocal() && selectedComponent.getLocalHomeClass() != null ?
selectedComponent.getEJBLocalObject(primaryKey) : selectedComponent.getEJBObject(primaryKey);
}
};
Object result;
switch (returnType) {
case SINGLE:
result = command.fetchOne(schema, args, factory);
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, args, factory);
break;
default:
throw new IllegalStateException("Unexpected return type: " + returnType);
}
return result;
}
}