How to copy the data of one node to another of the same context

Question

hi experts,
      i need to copy the data of one node to the other node of the same context.
the source node is a model node ( i.e comming from <b>RFC</b> ) and the destination node is a value node which i have creted.
what i have done is.
i have read the source node using wizard
do.
elem_t_p0591 = node_t_p0591->get_element(
    index = sy-index ).
    IF ( elem_t_p0591 IS INITIAL ).
      EXIT.
    ENDIF.
elem_t_p0591->get_static_attributes(
      IMPORTING
        static_attributes = stru_t_p0591 ).
IF stru_t_p0591 IS NOT INITIAL.
      wa_p0591 = stru_t_p0591.
      APPEND wa_p0591 TO itab_p0591.
    ENDIF.
  ENDDO.
and then i am trying to read the destination node so the tha data i have got by above method can be binded to the destination node.
but when i am trying to get the child node it is giving me a dump saying that
<b>'Access via 'NULL' object reference not possible' </b> i understand this because when i debug my value node is becoming <b>initial</b>, and when i am trying to access the destination node using this <b>initial</b> node it will give me a dump,
but what is the work aroud for this.
Plz help.
Regards,
Santosh.

Answer 1

Hi Santosh,
               I tried replicating your behaviour in my system. This is what my context structure looks like:
Node_Test (c-> 0:n)
  Name(attribute)
  Node_Test2 (c-> 0:1)
     Name2(attribute)
Now when i try to access Node_Test2 then it returns me (initial) i.e. no reference and i believe the reason is that my parent node, Node_Test, is of type table( because of the cardinality) so I am expected to perform an operation on my sub node, Node_Test2, based on the node i have selected, or have specified via index .. 1 is taken by default, in Node_Test.. which in WDDOINIT is initial as i havent got access to my view yet.. so instead what you can do is bind data to your parent node, relevant data ofcourse, and then bind the recieved data to your child node i.e. Node3.
I am pasting the code here for your reference :
method WDDOINIT .
       DATA:
         node_test                           TYPE REF TO if_wd_context_node,
         elem_test                           TYPE REF TO if_wd_context_element,
         stru_test                           TYPE wd_this->element_test ,
         lt_table   LIKE TABLE OF stru_test,
         item_test_1                         LIKE stru_test-test_1.
     navigate from <CONTEXT> to <TEST> via lead selection
       node_test = wd_context->get_child_node( name = wd_this->wdctx_test ).
     @TODO handle not set lead selection
       IF ( node_test IS INITIAL ).
       ENDIF.
     get element via lead selection
       elem_test = node_test->get_element(  ).
     @TODO handle not set lead selection
       IF ( elem_test IS INITIAL ).
       ENDIF.
stru_test-test_1 = 'Anoop'.
APPEND stru_test to lt_table.
stru_test-test_1 = 'Avi'.
APPEND stru_test to lt_table.
stru_test-test_1 = 'Sid'.
APPEND stru_test to lt_table.
CALL METHOD node_test->bind_table
  EXPORTING
    new_items            = lt_table
   set_initial_elements = ABAP_TRUE
   index                =
      DATA:
        node_t2                             TYPE REF TO if_wd_context_node,
        elem_t2                             TYPE REF TO if_wd_context_element,
        stru_t2                             TYPE wd_this->element_t2 ,
        item_t2_1                           LIKE stru_t2-t2_1.
    navigate from <CONTEXT> to <TEST> via lead selection
     node_test = wd_context->get_child_node( name = wd_this->wdctx_test ).
    @TODO handle not set lead selection
      IF ( node_test IS INITIAL ).
      ENDIF.
<b>*     navigate from <TEST> to <T2> via lead selection
      node_t2 = node_test->get_child_node( name = wd_this->wdctx_t2 ).</b>
<b>*     alternative navigation via index
     Node_T2 = Node_Test->get_Child_Node(
       Name = `T2` Index = 1 ).</b>
    @TODO handle non existant child
    if ( Node_T2 is initial ).
    endif.
    get element via lead selection
      elem_t2 = node_t2->get_element(  ).
    get single attribute
      elem_t2->get_attribute(
        EXPORTING
          name =  `T2_1`
        IMPORTING
          value = item_t2_1 ).
endmethod.
I hope this helps.
Regards,
Anoop