ADF BC, how implements business rules?

Question

Hi.
I am new in oracles technology. Please help me understand how implements business rules.
For example: I have two tables operation(id,code) and operation_item(id, operation_id, code). I create entities objects for it: OperationEntity, OperationItemEntity and association: OperationItemToOperation. Then create entity-based view object OperationById which have bind parameter id for find operation by id. I also create entity-based view object OperationItem and view link OperationItemToOperationLink.
My ApplicationModule contains OperationById and OperationItem via OperationItemToOperationLink
I want implements "clone" method at OperationById view for current row. This method create copy selected row from operation table and copy all rows from operation_item table where operation_item.operation_id = operation.id.
I add method createCurrentRowClone to OperationById:
public void createCurrentRowClone() {
OperationByIdRowImpl currentRow =
(OperationByIdRowImpl ) getCurrentRow();
OperationByIdRowImpl newRow = (OperationByIdRowImpl ) createRow();
insertRow(newRow);
newRow.setAttributes(currentRow);
//TODO create copy for all rows from OperationItem
//??? how get OperationItem instance
and I add method clone to OperationItem:
public void createClone {
// for all row from OperationItem create clone
but I don't understand how get OperationItem instance in OperationById scope. I have method getOperationItems() in OperationByIdRowImpl class which return RowIterator, and it give me instances of OperationItemRowImpl class, but not OperationItem with rows where operation_item.operation_id = operation.id
Thanks in advance

Answer 1

For realizations "clone" method which make copy for current row from OPERATION table and all rows from OPERATION_ITEM table where
operation_item.operation_id = operation.id I moved realisation business logic from View Object to Entity.
For it enough:
1) entities objects: OperationEntity, OperationItemEntity;
2) association for this entities: OperationItemToOperation;
3) entity-based view object: OperationById which have bind parameter "id" for find operation by ID;
4) application module: ApplicationModule;
I add method createCurrentRowClone to OperationByIdImpl class. It just call createClone method for current row:
public void createCurrentRowClone() {   
OperationByIdRowImpl currentRow = (OperationById) getCurrentRow();
currentRow.createClone();
method createClone in OperationByIdRowImpl class call createClone method from entity layer:
public void createClone() {
getOperationEntity().createClone();
method createClone in OperationEntityImpl class make new row and call createClone for all row from OperationItemEntity:
public void createClone() {
OperationEntityImpl newRow = (OperationEntityImpl) getDefinitionObject().createInstance2(
getDBTransaction(),null);
newAtm.setCode(getCode());
//create copy for all rows atm_operation
RowIterator itemIterator = getOperationItemEntities();
while ( itemIterator .hasNext() ) {
OperationItemEntity itemRow = (OperationItemEntity ) itemIterator.next();
itemRow.createClone(newRow);
and finally method createClone(OperationEntityImpl operation) in OperationItemEntityImpl class make new row in OPERATION_ITEM table
public void createClone(OperationEntityImpl operation) {
OperationItemEntityImpl newItem = (OperationItemEntityImpl) getDefinitionObject().createInstance2(
getDBTransaction(), operation);
newItem.setCode(getCode());
If you have another solution, please post it here.