Dynamic Structure creation and assigning data.

Hi,
I have a structure and a work area,
DATA: begin of sample_struct,
      elem1 type xxx,
      elem2 type yyy,
      elem3 type zzz,
      end of sample_struct.
DATA: wa_sample_struct type sample_struct.
DATA: lr_rtti_struc TYPE REF TO cl_abap_structdescr.
DATA: lt_comp       TYPE cl_abap_structdescr=>component_table.
DATA: ls_comp       LIKE LINE OF lt_comp.
DATA: l_index       TYPE string.
DATA: lr_data       TYPE REF TO data.
DATA: lr_table      TYPE REF TO
I create a new structure at run time extending the sample_struct to add few more components at run time like this.
lr_rtti_struc ?= cl_abap_structdescr=>describe_by_data(wa_sample_struct).
    lt_comp = lr_rtti_struc->get_components( ).
do 10 times.
      l_index = sy-index
      concatename 'element' l_index into ls_comp-name
      ls_comp-type = cl_abap_elemdescr=>get_string( ).
      APPEND ls_comp TO lt_comp.
enddo.
Then i create a work area of this new structure like this.
lr_rtti_struc = cl_abap_structdescr=>create( p_components = lt_comp ).
    CREATE DATA lr_data TYPE HANDLE lr_rtti_struc.
    ASSIGN lr_data->* TO <fs_data>.
Now <fs_data> is a work area for the structure.
I can move the data in wa_sample_struct into <fs_data> like this.
move-corresponding wa_sample_struct to <fs_data>.
My problem is how do i access the dynamic components of this work area so that i can assign data to those components.
If anybody knows how to access the dynamically added components of <fs_data> so that I can assgin data to those.
Thanks in advance
Sesh
Message was edited by: Seshatalpasai Madala

Hi,
Looks like the problem is not well stated as I am getting answers which are not relevent.
My existing structure.
DATA: begin of sample_struct,
elem1 type xxx,
elem2 type yyy,
elem3 type zzz,
end of sample_struct.
I create a new structure using this structure at runtime by adding new fields which are in a internal table. I add the new fields as follows.
loop at it_tab into wa_tab.
ls_comp-name = wa_tab.
ls_comp-type = cl_abap_elemdescr=>get_string( ).
APPEND ls_comp TO lt_comp.
endloop.
This internal table is built using the user input. So I dont know how many and what are the values in the internal table.
LT_COMP has the existing structure field's as well as the newly added fields for my new structure.
I create a new structure using this component list LT_COMP.
DATA: lr_rtti_struc TYPE REF TO cl_abap_structdescr.
lr_rtti_struc = cl_abap_structdescr=>create( p_components = lt_comp ).
Now I have an object of cl_abap_structdescr. Which I can use as a data type for defining Workarea and internal table of this structure like this.
CREATE DATA lr_data TYPE HANDLE lr_rtti_struc.
ASSIGN lr_data->* TO <fs_data>.
I can access all the existing fields of the strucutre like this.
<fs_data>-elem1
<fs_data>-elem2
My problem is how do i access the newly added fields of the strucutre as I dont know the names of the fileds(I know them only at runtime).
I hope I have explained it well enough, hope to see a relevent answer for the above problem.
Thanks in advance.
Sesh

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>
So to terms.
1. Am I correct that the heap was so named because (perhaps at one point in time), a heap is/was commonly used to track the available memory in the free store?Which 'heap'? The VM one? It is probably named that because the implementors of the Sun VM were familar with how C++ and Smalltalk allocated memory.Okay, but that begs the question, was the heap in C++ and/or Smalltalk so named for the above queried reason?
>
2. If so, would it be correct that there would be a heap per standard block size?Not sure what you are referring to but probably a detail of the implementation. And since there are different levels the question doesn't mean much.
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The VM heap might use word boundaries (but not size), where the application heap certainly does (word boundary.)My understanding of it is that the application would request blocks from the OS, and then something like malloc would manage the memory within the allocated blocks. malloc (or whatever equivalent Java uses) would have to keep track of the memory it has allocated somehow, and I would think it would have to do this at the word level, since it's most commonly going to allocate memory at the word level to be references to other objects, etc.
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>
4. What would be the most likely property one would use as a key. That is, what makes the root item on the heap ideal?"Key" is not a term that will apply in this discussion.
You appear to be referring to strategies for effective allocation of memory such as allocations from different regions by size comparison.
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>
5. Would a industrial strength system like the jvm use a (perhaps modified or tuned) heap for this sort of task, or would this typically be too naive for an real world solution today?Again too indefinite. The Sun VM uses a rather complicated allocator, the model for which originated after years of proceeding research certainly in Smalltalk and in Lisp as well, both commercially and academically.
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private String data;
getters/setters...
}Say the type can be sex (a radio button component), level of user (selectOne with the values of gold, platinum and silver) or location (a textfield) (these are an example of the type of data--there are many more entries that are of one of these three component types that need to be handled). I have a list of these beans that could go in a dataTable or whatnot, so I'd like to be able to dynamically generate the components. Does anyone have any suggestions or input?
My guess is a component will need to be returned from the bean that describes how it should be rendered--I'm just looking for a jumpstart on the best way to do this, see if anyone has code snippets, references, etc.
TIA.
P.S. Apologies if this is posted twice...some errors when I tried to post this the first time...

So, are you saying to have all three types of components in a given line of the datatable, wire each up to do have the appropriate values (male/female or silver/gold/platinum) and then have a rendered argument read a bean property such as isRadio, isSelect or isText and just render the appropriate one?

Dynamic Structure creation and assigning data.

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