// Copyright 2010 NexJ Systems Inc. This software is licensed under the terms of the Eclipse Public License 1.0
package nexj.core.persistence.virtual;
import java.util.ArrayList;
import nexj.core.meta.Attribute;
import nexj.core.meta.Metaclass;
import nexj.core.meta.persistence.virtual.WorkMapping;
import nexj.core.meta.persistence.virtual.VirtualDataSourceFragment;
import nexj.core.meta.persistence.virtual.VirtualMapping;
import nexj.core.persistence.Work;
import nexj.core.rpc.TransferObject;
import nexj.core.runtime.Instance;
/**
* Work item that executes virtual persistence adapter delete mappings.
*/
public class VirtualDelete extends VirtualWork
{
// constants
/**
* The name for the transfer object event.
*/
public final static String EVENT = "delete";
// constructors
/**
* Creates a new deletion work item.
* @param instance The instance to delete.
* @param adapter The adapter.
*/
public VirtualDelete(Instance instance, VirtualAdapter adapter)
{
super(instance, adapter);
}
// operations
/**
* @see nexj.core.persistence.Work#getType()
*/
public int getType()
{
return DELETE;
}
/**
* @see nexj.core.persistence.virtual.VirtualWork#execute(nexj.core.persistence.Work[], int, int)
*/
public void execute(Work[] workArray, int nStart, int nEnd)
{
Metaclass metaclass = m_instance.getMetaclass();
VirtualMapping mapping = (VirtualMapping)m_mapping;
WorkMapping operation = mapping.getDeleteMapping();
Attribute lockingAttribute = mapping.getLockingAttribute();
int nLockingOrdinal = (lockingAttribute == null) ? -1 : lockingAttribute.getOrdinal();
String sLockingAttributeName = (lockingAttribute == null) ? null : lockingAttribute.getName();
VirtualDataSourceFragment fragment = (VirtualDataSourceFragment)getFragment();
ArrayList tobjList = new ArrayList(nEnd - nStart);
for (int i = nStart; i < nEnd; i++)
{
Instance instance = workArray[i].getInstance();
TransferObject tobj;
if (nLockingOrdinal >= 0)
{
tobj = new TransferObject(instance.getOID(), metaclass.getName(), EVENT, 1);
tobj.setValue(sLockingAttributeName, instance.getValue(nLockingOrdinal));
}
else
{
tobj = new TransferObject(instance.getOID(), metaclass.getName(), EVENT, 0);
}
tobjList.add(tobj);
}
operation.invoke(tobjList, m_adapter.getInvocationContext().getMachine(), fragment);
}
}