Access to class-attribute by Interface-reference

Hi OO-Gurus,
I use an implementation of BADI ME_PROCESS_REQ_CUST to fill and handle user-defined fields in the MM-Purchase-Requisition, method IF_EX_ME_PROCESS_REQ_CUST~OPEN.
There I use a reference variable which refers to an interface (type ref to IF_PURCHASE_REQUISITION_ITEM) to access the item-object. My problem is that I need to have access to the class-attribute my_state. The corresponding class lcl_req_item is defined locally (LMEREQF01). So I cant use a reference variable with reference to this class (so widening cast using the interface-reference is not possible) .. Does anyone know a trick how to access the class-attribute anyway?
Coding:
data: l_item_list       TYPE MMPUR_REQUISITION_ITEMS,
           l_item             TYPE MMPUR_REQUISITION_ITEM,
           l_item_akt       TYPE mereq_item,
           l_item_ref        TYPE ref to IF_PURCHASE_REQUISITION_ITEM.
l_item_list = im_header->get_items().
loop at l_item_list into l_item.
    l_item_akt = l_item-item->get_data( ).
    l_item_ref = l_item-item.
endloop.
(Debugging the code, I manage by doubleclicking the fieldcontent of l_item_ref (e.g ) to show the content of the class-attribute my_state. This works only if the field Interface in the Debugger is empty because then I see the attributes of the class. If the field Interface is filled with IF_PURCHASE_REQUISITION_ITEM, there arent any attributes shown.)
Thanks in advance for your kind help!!
Nicole

Hello Nicole
The following sample coding shows you how to solve your problem. Please do not ask me how I came across this solution.
However, if you are studying it carefully you may stumble across a most beautiful property of field-symbols as I did.
METHOD if_ex_me_process_req_cust~open.
DATA: l_item_list TYPE mmpur_requisition_items,
l_item TYPE mmpur_requisition_item,
l_item_akt TYPE mereq_item,
l_item_ref TYPE REF TO if_purchase_requisition_item.
DATA:
    ld_attr         TYPE string,
    lo_obj          TYPE REF TO object.
FIELD-SYMBOLS:
    <lo_lcl>        TYPE ANY,
    <ls_item>       TYPE mereq_item,
    <ls_itemx>      TYPE mereq_itemx.
l_item_list = im_header->get_items( ).
LOOP AT l_item_list INTO l_item.
    l_item_akt = l_item-item->get_data( ).
    l_item_ref = l_item-item.
    lo_obj     ?= l_item-item. " casting to root object !!!!!
    ld_attr = 'MY_STATE'.
    ASSIGN lo_obj->(ld_attr) TO <lo_lcl>.
    ld_attr = 'MY_STATE->ITEM'.
    ASSIGN lo_obj->(ld_attr) TO <ls_item>.
"    ASSIGN l_item_ref->(ld_attr) TO <ls_item>. " does not work...
    ld_attr = 'MY_STATE->ITEMX'.
    ASSIGN lo_obj->(ld_attr) TO <ls_itemx>.
ENDLOOP.
" NOTE: data definition of local class lcl_req_item_state (fg MEREQ)
**    DATA: item           TYPE mereq_item,
**           itemx          TYPE mereq_itemx,
**           header         TYPE REF TO lcl_req_header,
**           ref_item       TYPE REF TO lcl_req_item,
**           acct_container TYPE REF TO lcl_acct_container,
**           source         TYPE REF TO cl_source_of_supply_mm,
**           release_state TYPE REF TO cl_release_state_mm,
**           text_manager   TYPE REF TO lcl_text_manager,
**           bom            TYPE REF TO lcl_bom,
**           funds_mgt_active TYPE mmpur_bool VALUE mmpur_no,
**           aktyp          TYPE aktyp,
**           no_auth        TYPE mmpur_bool VALUE mmpur_no,
**           release_op     type mmpur_bool value mmpur_no,
**           persistent     TYPE mmpur_bool VALUE mmpur_no,
**           checked        TYPE mmpur_bool VALUE mmpur_no,
**           manual_configuration TYPE mmpur_bool,
**           input_buffer_changed TYPE mmpur_bool VALUE mmpur_no,
**           changed        TYPE mmpur_bool,
**           broken_rules   TYPE lty_mask,
**           referenced_rules TYPE lty_mask,
**           chp_changes    TYPE mmchp_chp_list,
**           dcm_manager    TYPE REF TO if_revision_manager_dcm,
**           "DCM Retrofit
**           rel_state_after_release TYPE REF TO cl_release_state_mm,
**           "DCM Retrofit
**           chdoc_container TYPE REF TO lcl_chdoc_container,
**           "DCM Retrofit
**           service_changed TYPE mmpur_bool,
**           "DCM Retrofit
**           determinants   TYPE lty_item_determinants.
ENDMETHOD.
Regards
Uwe

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Access to class attributs by coding in its mother class method definition

Hi all,
How can I retrieve information about a class attributs by coding?
And is it possible to access to the attributs of the Child class from the Mother class?
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CALL METHOD oref->method). "Here I want to access to this class's attribut without redefine it

Hi,
a very easy way is to define an attribute TYPE REF TO DATA in the super class and write generic access methods which work with it by dereferencing it and assigning a field symbol. This might even save you the effort of creating a class hierarchy, because one class may be able to handle all the data objects whose types are only known at run-time.
In the below example, the only specific thing about the sub class is the constructor in which the data object is created and typed:
REPORT ztesta.
*       CLASS lcl_mother DEFINITION
CLASS lcl_mother DEFINITION.
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*       CLASS lcl_child1 DEFINITION
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PUBLIC SECTION.
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lr_child      TYPE REF TO lcl_mother,
ls_but000_in TYPE        but000,
ls_but000_out type        but000.
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ls_but000_in-partner = '0000004711'.
lr_child->set_data( ls_but000_in ).
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CLASS lcl_mother IMPLEMENTATION.
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*& Report ZTESTA
REPORT ztesta.
*       CLASS lcl_mother DEFINITION
CLASS lcl_mother DEFINITION.
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CLASS lcl_child1 DEFINITION INHERITING FROM lcl_mother.
PUBLIC SECTION.
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CLASS lcl_child2 DEFINITION INHERITING FROM lcl_mother.
PUBLIC SECTION.
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ENDCLASS.                    "lcl_child1 DEFINITION
DATA:
lr_child1     TYPE REF TO lcl_mother,
lr_child2     TYPE REF TO lcl_mother,
ls_but000     TYPE        but000,
ls_t000       TYPE        t000.
START-OF-SELECTION.
CREATE OBJECT lr_child1 TYPE lcl_child1.
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WRITE: / ls_but000-partner.
CREATE OBJECT lr_child2 TYPE lcl_child2.
lr_child2->get_data( IMPORTING es_data = ls_t000 ).
WRITE: / ls_t000-mwaer.
*       CLASS lcl_mother IMPLEMENTATION
CLASS lcl_mother IMPLEMENTATION.
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    FIELD-SYMBOLS:
      <fs_data> TYPE ANY.
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*       CLASS lcl_child1 IMPLEMENTATION
CLASS lcl_child1 IMPLEMENTATION.
METHOD constructor.
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ENDMETHOD.                    "constructor
ENDCLASS.                    "lcl_child1 IMPLEMENTATION
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CLASS lcl_child2 IMPLEMENTATION.
METHOD constructor.
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I hope this helps!
Regards,
Thorsten

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Hi srinivas.yangal,
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By a mirrored interface i mean i just created an interface based off my existing serializable classes, i.e. copied the method constructors into an interface class and made the serializable class implement that interface.
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I am trying to build a component which has the ability to instantiate and execute
an known EJB method on the fly.
I have managed to build the component but when I try and execute it I get a ClassNotFoundException.
I know that the EJB I am trying to invoke is deployed and available on the server,
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try {
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Please make sure ");
logStandardErrorMessage("that you have deployed the ejb with the JNDI
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throw ne;
} catch (Exception e) {
logStandardErrorMessage(e.toString());
throw e;
Any advice would be really appreciated, I'm fast running out of ideas, I suspect
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Regards
Jo Corless

Hello Joanne,
Congratulations! I'm very happy that you've managed to fix your problem. It's
always essential to understand how to package applications when deploying on BEA
WebLogic. Usually, by throwing everything into an EAR file solves just about all
the class loader problems. :-) Let us know if you have any further problems that
we can assist you with.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Joanne Corless" <[email protected]> wrote:
>
>
I've fixed it!!!!!!!!
Thanks to everyone who gave me help!!!!
The class loader was the culprit which is what I suspected all along.
As soon
as I put the 2 jar files I was using into an EAR file the problem went
away!!!!!
Thanks again
Jo Corless
"Ryan LeCompte" <[email protected]> wrote:
Hello Joanne,
As Mr. Woollen mentioned, I also believe it's a problem with the class
loader.
You need to be careful how you arrange your EJBs, because WebLogic has
a specific
method in which it loads classes in an EAR, JAR, and WAR file(s). Please
refer
to http://dev2dev.bea.com/articles/musser.jsp for more information about
BEA WebLogic
class loading mechanisms and caveats. Also, try printing out the various
methods
that are available on the object that was returned to you via reflection.
For
example, use the getMethods() method, which returns an array of Method
objects
that you can subsequently cycle through and print out the various method
names.
This way you can discover if the class found/returned to you is indeed
the one
you intend to locate.
Hope this helps,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Rob Woollen <[email protected]> wrote:
I believe the issue is the home interface class for this EJB is not
available in the class loader which is doing the reflection.
If you do:
getClass().getClassLoader().loadClass(homeInterfaceClassName)
I suspect it will fail. Reflection still requires that the class be
loadable.
-- Rob
Joanne Corless wrote:
Hi Slava,
If I make my code look like you describe below I get a compliationerror telling
me that
home.getMethod() is not recognised (no such method)
If I change it slightly and use
Method homeCreateMethod =
home.getClass().getMethod(homeCreate,homeCreateParam);
The code will compile OK but when executed it still throws a NoSuchMethodException
Any ideas ?
Thanks for your help so far
Regards
Jo Corless
Your code should look like
Object home = pCtx.lookup(pJNDIName);
Method homeCreateMethod =
home.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
Regards,
Slava Imeshev
"Joanne Corless" <[email protected]> wrote in message
news:[email protected]...
Hi Ryan,
I also wanted to mention that if you do a "header search" in this
particular
newsgroup
with the search query as "reflection", you will see many previousmessages
regarding
reflection and EJBs. I believe you could learn a lot from thedifficulties
that
others have faced and solved.I tried that and although there was a number of similar cases noneof them
actually
seem to fix my issue. Thanks for the suggestion though
Are the EJBs that you are trying to access accessible via your
system
classpath?
Try to avoid having them accessible via the main system classpath,and
only bundle
them in your appropriate EJB jar files (contained in an EAR file,for
example).Maybe I should have laid the problem out a little clearer.
I have a number of EJB's bundled up in a JAR file which is hot deployedto
the
server. Within this first JAR file is an EJB (SSB) component that
needs
to
be
able to invoke a known method on another EJB. This second EJB may
or
may
not be
within the first JAR file but it also will be hot deployed.
The component trying to invoke the method on the 2nd EJB has to
be
able to
create
an instance of the 2nd EJB without actually knowing anything bar
a
JNDI
Name which
is passed in at runtime.
I can get as far as doing the
Object home = pCtx.lookup(pJNDIName);
This returned a class with the name
"com.csc.edc.projects.allders.httppostoffice.postman.PostmanBean_mp8qy2_Home
Impl_WLStub"
My problem seems to occur when I try and invoke the create method
Method homeCreate = home.getClass().getMethod("create", new Class[0]);
My code throws a java.lang.NoSuchMethodException at this point so
I
am
unable
to progress to the next step of :
Object bean = homeCreate.invoke(home, null);
So I can return the instantiated bean back to the calling client.
Why am I getting the NoSuchMethodException, is is because I am gettinga
stub
back rather than the home interface and if so how do I get the truehome
interface
from the bean
Thanks in advance
Jo Corless

Field-symbols as class attribute

Hi Fellas,
Is there a way we can define a field-symbols as a class attribute ? My requirement is that i am dynamically constructing a structure at runtime in my model class and binding the component of this structure to my view fields. I am able to create the structure which is basically ref to cl_abap_structdescr and the problem is when i am binding to the model attribute, i need this to be a structure so that i can address the components as "//model/structure.component".
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Cheers,
Ram.

Hi Ram,
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By default data binding is only possible like this:
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Structure attribute
value=//<model>/<structure name>.<field name>
Table attribute
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Regards,
Thilo

Load Jar and access a class in jar at run time

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String lcStr ="jartest";
URL jfile = new URL("jar", "", "file:" + file.getAbsolutePath() +"!/");
URLClassLoader cl = URLClassLoader.newInstance(new URL[] { jfile });
Class loadedClass = cl.loadClass(lcStr);
Thing t=(Thing)loadedClass.newInstance();
t.execute();
catch(Exception e)
System.err.println(e);
Thing.java
public interface Thing
void execute();
jartest.java
public class jartest implements Thing
public void exceute()
System.out.println("Welcome");
Thanks and Regards
V.Senthil Kumar
Edited by: senthilv_sun on Dec 16, 2008 8:30 PM

senthilv_sun wrote:
I need help from you.
How to load a Jar and access a class in the jar at run time?
When i try the following code it works fine while running in Java (Jdk1.5).If iam running the same code in servlet,ClassCastException occurs.
Error Message : ClassCastExcption : jartest1 cannot be cast to ThingPresumably we can only hope that that is a transciption error. It always helps to use copy and past actual errors and code rather than manually typing them.
test.jar contains jartest.class and Thing.classWrong.
The interface class and plugable class must not be in the same jar.
A plugable interface requires two components
- Interface (generic sense)
- Functional components.
The Interface must be independant (own jar) so that it is available to the framework (user of plugin) and to the functional components. And the plugable component must not be on the java class path.
This also means that we know for certain that the plugable component is also on the system class path. That is a bad idea as well.
Given that it is pretty pointless to even speculate as to why this error is showing up. Create the correct jar layout. Test using the command line. Then test using servlets. Insure that the plugable jar is NOT on the java classpath for both tests.

Accessing Java Classes from Forms

Is is possible to access a Java class from Forms? I have been
creating an Active X control that returns a Java object, and from
that I can call methods on that object, but I would really like
to do that without having and Active X control in the mix. Any
suggestions?
null

Oracle Developer Team wrote:
: Robert Nocera (guest) wrote:
: : Oracle Developer Team wrote:
: : : hey robert -
: : : Developer 6.0 provides this ability for web deployment.
You
: : can
: : : insert your own custom Java components into your
application
: : and
: : : they will appear in the application when it is run via the
: web.
: : : If you look at the documentation for 6.0, there are a few
: : : section son Pluggable Java Components and JavaBeans that
: : : describes what is provided and how you use the interfaces
: and
: : : classes we provide.
: : : A whitepaper on this topic will be posted to the OTN
: shortly,
: : as
: : : well as some samples that illustrate how to go about doing
: it.
: : : cheers!
: : : -Oracle Developer Team-
: : Thanks for the quick response. Is there any way to access
: those
: : classes without being in a web deployment. That's probably
: not
: : totally out of the question, but what we had in mind was
: adding
: : some Java Functionality (actually connectictivity to some
EJBs
: : that we have) to existing forms. Currently there forms are
: not
: : deployed in a "web" environment and are just run from the
: forms
: : runtime engine.
: : -Rob
: hey again robert -
: there's no easy way (yet!) to call out from forms runtime
: process to a Java application.
: We've played around some with creating an ORA_FFI interface to
: JNI and then wrappering this with PL/SQL code. We've been able
: to make calling into an EJB running in 8i from a forms runtime
: work using this approach.
: Let me know if this is of interest to you and I can post the
: stuff we've currently got. It's no more than a simple demo and
: is not complete. It requires quite a bit of manual coding on
: the PL/SQL side since the interface emulates JNI (FindClass,
: GetMethodID, CallMethodID, etc.).
: cheers!
: -the Oracle Developer Team-
I'd be interested in this ORA_FFI doc you've been playing with.
Would you please email it to me or post it.
null

In onLoad JavaScript, I'm getting "Error: Permission denied to access property 'classes'" when I access Components.classes; how do I enable that permission?

I need to emulate several ActiveX functions in my client's web application. I have located several Mozilla web pages that describe how to do the things I need, and I have attempted to implement those instructions. However, I can't seem to get past the first line of code. In my web page, I am calling a JavaScript function using the onLoad attribute of the <body> tag. I am using the Navigator object to determine that the browser is Firefox. I then attempt to access the extension classes using the following code on lines 51 and 52 of the Download.js file:
var C = Components;
var CC = C.classes;
The Web Console gives me these two messages:
[13:51:55.621] The Components object is deprecated. It will soon be removed. @ http://distribution:781/NewDDI/DownLoad.js:51
[13:51:55.621] Error: Permission denied to access property 'classes' @ http://distribution:781/NewDDI/DownLoad.js:52
How do I enable adequate permission to be able to access the Components classes?

I think Components is available only in extensions (or otherwise privileged code) and not in ordinary web pages.

Field symbols as Class Attributes

Hello Gurus,
Is anybody able to say to me if it is possible to declare field symbols as class attributes? As I can understand until now, this is not possible and we need to use some attribute with the "TYPE REF TO Data" to get the information we need. Correct?
Thanks,
Daniel.

Ok, let me see if someone can give me some idea on how to improve my method:
Method: PREPARE_PTOOL_DATA
Parameters specification:
Parameter        Type     Typing     Reference Type
PF_ANALYSIS        Importing     Type     /SYM/SC_PT_ID_ANALYSIS_D
PF_ANAL_DESC        Importing     Type     /SYM/SC_NM_DESC_ANALYSIS
PF_LOGIC        Importing     Type     CHAR01
PF_MATERIAL        Importing     Type     MATNR
PF_MAKTX        Importing     Type     MAKTX
PT_DATA_COMPA        Exporting     Type     /SYM/SC_TAB_PT_RESULT_CP
PT_CALC_ANALY        Exporting     Type     /SYM/SC_TAB_PT_RESULT_CA
PT_DATA_MATERIAL1 Changing     Type     /SYM/SC_TAB_PROC_ALLERG_RESULT
PT_DATA_MATERIAL2     Changing     Type     /SYM/SC_TAB_PROC_ALLERG_RESULT
Source code:
From the /SYM/SC_CL_PROCESS_ALLERG_GEN class
Old version (but it is working)
METHOD prepare_ptool_data.
DATA: ls_data_material1   TYPE /sym/sc_s_proc_allerg_result,
        ls_data_material2   TYPE /sym/sc_s_proc_allerg_result,
        lf_index_material1 TYPE sy-tabix,
        lf_index_material2 TYPE sy-tabix,
        ls_result_cp        TYPE /sym/sc_pt_result_cp,
        ls_result_ca        TYPE /sym/sc_pt_result_ca.
Prepare data for Data Comparison step
IF pt_data_compa IS REQUESTED.
    LOOP AT pt_data_material1 INTO ls_data_material1.
      lf_index_material1 = sy-tabix.
      CLEAR ls_result_cp.
      MOVE pf_analysis   TO ls_result_cp-analysis.
      MOVE pf_anal_desc TO ls_result_cp-desc_analysis.
      MOVE ls_data_material1-algbe TO ls_result_cp-desc_property.
If Logic 'A', move the text from ls_data_material1 to original
material status
      IF pf_logic EQ c_logic_a.
        MOVE ls_data_material1-agsbe TO ls_result_cp-val_orig_matnr.
If Logic 'B', move the text from ls_data_material1 to "toy"
material status
      ELSEIF pf_logic EQ c_logic_b.
        MOVE ls_data_material1-agsbe TO ls_result_cp-val_toy_matnr.
      ENDIF. " IF pf_logic EQ c_logic_a.
Read the lt_data_toy by the Allergen ID (ALGEN)
      CLEAR ls_data_material2.
      READ TABLE pt_data_material2 INTO ls_data_material2
            WITH KEY algen = ls_data_material1-algen BINARY SEARCH.
      IF sy-subrc EQ 0.
        lf_index_material2 = sy-tabix.
If Logic 'A', move the text from ls_data_material2 to "toy°
material status
        IF pf_logic EQ c_logic_a.
          MOVE ls_data_material2-agsbe TO ls_result_cp-val_toy_matnr.
If Logic 'B', move the text from ls_data_material2 to original
material status
        ELSEIF pf_logic EQ c_logic_b.
          MOVE ls_data_material2-agsbe TO ls_result_cp-val_orig_matnr.
        ENDIF. " IF pf_logic EQ c_a.
Delete record from lt_data_toy, index lf_index_toy
        DELETE pt_data_material2 INDEX lf_index_material2.
      ENDIF. " IF sy-subrc EQ 0.
      APPEND ls_result_cp TO pt_data_compa.
Delete record from lt_data_orig, index lf_index_orig
      DELETE pt_data_material1 INDEX lf_index_material1.
    ENDLOOP. " LOOP AT lt_data_material1 INTO ls_data_material1.
ENDIF. " IF pt_data_compa IS REQUESTED.
Prepare data for Calculation Analysis step
IF pt_calc_analy IS REQUESTED.
    LOOP AT pt_data_material1 INTO ls_data_material1.
      lf_index_material1 = sy-tabix.
      CLEAR ls_result_ca.
      MOVE pf_material   TO ls_result_ca-matnr.
      MOVE pf_maktx      TO ls_result_ca-maktx.
      MOVE pf_analysis   TO ls_result_ca-analysis.
      MOVE pf_anal_desc TO ls_result_ca-desc_analysis.
      MOVE ls_data_material1-algbe TO ls_result_ca-desc_property.
If Logic 'A', move the text from ls_data_material1 to original
material status
      IF pf_logic EQ c_logic_a.
        MOVE ls_data_material1-agsbe TO ls_result_ca-val_curr_stat.
If Logic 'B', move the text from ls_data_material1 to "toy"
material status
      ELSEIF pf_logic EQ c_logic_b.
        MOVE ls_data_material1-agsbe TO ls_result_ca-val_simul_stat.
      ENDIF. " IF pf_logic EQ c_logic_a.
Read the lt_data_toy by the Allergen ID (ALGEN)
      CLEAR ls_data_material2.
      READ TABLE pt_data_material2 INTO ls_data_material2
            WITH KEY algen = ls_data_material1-algen BINARY SEARCH.
      IF sy-subrc EQ 0.
        lf_index_material2 = sy-tabix.
If Logic 'A', move the text from ls_data_material2 to "toy°
material status
        IF pf_logic EQ c_logic_a.
          MOVE ls_data_material2-agsbe TO ls_result_ca-val_simul_stat.
If Logic 'B', move the text from ls_data_material2 to original
material status
        ELSEIF pf_logic EQ c_logic_b.
          MOVE ls_data_material2-agsbe TO ls_result_ca-val_curr_stat.
        ENDIF. " IF pf_logic EQ c_a.
Delete record from lt_data_toy, index lf_index_toy
        DELETE pt_data_material2 INDEX lf_index_material2.
      ENDIF. " IF sy-subrc EQ 0.
      APPEND ls_result_ca TO pt_calc_analy.
Delete record from lt_data_orig, index lf_index_orig
      DELETE pt_data_material1 INDEX lf_index_material1.
    ENDLOOP. " LOOP AT lt_data_material1 INTO ls_data_material1.
ENDIF. " IF pt_calc_analy IS REQUESTED.
ENDMETHOD.
As you can see, I am repeating almost the same code, just changing some items. I am not sure if I can use new parameters (ANY or ANY TABLE) but, my first idea to improve it was to use the field-symbols (and it works ok). The issue is that I have to repeat the assignment lines every same named method of the classes I am changing (I would like to do the assignment into a new method of the superclass). Do you think it is possible or should I give up and proceed with the assignments locally, for each same named method of each class?
Thanks,
Daniel.

Inner classes in my interface - ok, no k, indifferent?

I have an interface and a set of ComparatorS which are only used for objects which implement the interface. So I put the ComparatorS in the interface like so (not actual code because it is for my job):
public interface Abc {
//Class loader should only do this once so they are basically singleton constants
public static final Comparator C_1 = new C1();
public static final Comparator C_2 = new C2();
//... there is one more
public String getSomething();
public String getSomethingElse();
//First Comparator inner class
public class C1 implements Comparator {
     private C1(){ }
     //implements appropriate methods checking for instanceof Abc in the compareTo method
    //Compares something (using getSomething())
/* Second Comparator inner class */
public class C2 implements Comparator {
    //same thing
    //Compares somethingElse (using getSomethingElse())
} //End interfaceUsage:
Set s = new TreeSet(Abc.C_1);
s.add(abc1);Because the Comparator implementations were specific to objects which implement the interface I felt that was the best way to make that fact clear. If they were over in a separate package it would be confusing that these are for the one interface. If they were in the same package as Abc it wouldn't fit (IMO) because they are more utility type classes.
So it was either that or make them a singleton in their own class files or something like this and I found myself liking this.
Any comments on pros/cons of doing it this way?

I'm confused as to why it would make sense to put the
Comparators 'in' the interface but not in the package
with the interface. You can't put them 'in' the
interface without putting them in the package. In
reality, nesting them in the interface just creates
classes in the interface's package.My whole deal is that after talking it out I see that it is bad for reuse to have something which could be so generic residing in a particular interface (and therefore deduced soon after that in the same package as my interface). Which made me decide not to have the inner classes because it IS in the same package at that point. But I am saying that is bad. As I tried to state before, for the same reason I now think it is bad to have the classes in the interface (not much i.e. no reuse outside of the interface) then it is bad to have it in the same package as the interface (unelegant reuse outside of the package). Because if the getSomething() is getName() that could be used as a comparator for many different objects in different packages. I don't want to limit. This stance was a progression, once I decided not in the interface, I then also decided not in the same package.
Java is strongly typed. If the class isn't an
instance of the class you are casting to (in this
case the interface) it doesn't matter if it has a
method with the same signature. The cast will fail.Yes, of course, but like generics, you are not limited to just one type (Object is the type of the parameter). So I can either use instanceof before casting (not the best way) or I could have private overloads of the compareTo() method, a new one for every type I support and each supported type which has a getName() could come from a couple different packages. Not that generics does it the same way but on top of being about to declare hierachies that a genericized object can deal with you can also have comma delimitted other objects. They don't have to be related by package or hierarchy in generics. So I don't think it would be so bad for my Comparator to be (if it fit that these different types all had the same method needed by my Comparator).
>>
Here's anothe reason not to do that. Let's say that
someone is using the interface. They need to compare
it to something else, if the Comparators are right
there with the interface, they will be likely to find
them. If they are in some other package, they'd have
to know where to go look for them.If that is the case, where I was worried about easy to find then I would go back to using inner classes with each Comparator as a constant. If I was worried about ease of finding where these ComparatorS are over code reuse across packages.
I mean, I think if I am going to tie the ComparatorS so close to a particular Type then I am going to add it as an inner class whether my type was an interface or a class. At least that is what I am thinking now.
>
This is what I am talking about. So many Java
developers treat packages like filing cabinets. I
put things that do this here and things that do that
there. But this is actually not very useful and it
hamstrings your designs.
Java doesn't have a friend class syntax like C++. So
there's no way to say this class over here has access
to this but no one else does. These kinds of
relationships are very desireable. Some classes will
need to access things in another class that shouldn't
be public. You can do this cleanly if they ae in the
same package but not otherwise.But I am not talking about taking an abstract class putting it in pack1 an a subclass in pack2. I am talking about putting a utility class that could eventially work on 50 classes in a place that is playingfield neutral and not in the original type it deals with today only. I am dealing with public accessor methods on my objects.
>
For example. Let's say you want to create a Factory
(I'm using Factory in a loose way here not
necessarily a GoF Pattern) for a public class. You
don't want every class to have access to contructor
because it creates the Object without initializing
all the necessary atttributes. The factory is
specially crafted to do this with protected info and
access rights. If you put the class and the factory
together it;s a snap. You create a package-protected
constructor, some package-protected methods and/or
fields and do it. No class outside the package will
be able to do these dangerous operations. How do you
do this if you have a factory package and a data
object package?That is a whole nother situation I think. In that case it is obvious. I thought my situation was a little less obvious because of the utility nature of the classes (ComparatorS) that I was dealing with.

Binding ABAP Class Attribute with BUS2038 in a Standard WF task

Hi,
I need help as mentioned in the subject line.
In my standard task I am capturing event for BUS2038. In the General tab I have a ABAP class which has implemented IF_WORKFLOW. From BUS2038 I just need notification number.
Since my source is a BO and my target is a class. How do I make this conversion and pass the data to my class?
I know there are several solution but none have solved my concern.
Thanks,
Sridhar Karra.

Hi,
If you want to access teh attributes of the BOR inside a class emthod then you have to make use of teh MACROS.
1. include INCLUDE CNTN01_SWC in the class local macros section. and in the type groupsof the class include SWC0.
2. Now if you know the key of the BOR instance then create a BOR object inside the class method as below
DATA lo_object TYPE SWC0_OBJECT.
SWC0_CREATE_OBJECT lo_object '<BUSXXXX>' '<Key of the BOR>.
the above line will create the instance of the bor inside the class method
now inorder to access the attributes of the BOR use the below code
DATA lv_notif_no TYPE <type of the notification>.
SWC0_GET_PROPERTY lo_object '<ATTRIBUTE NAME> lv_notif
In this way you can access the BOR attributes inside a class method.
Regards
Pavan
Edited by: Pavan Bhamidipati on Dec 15, 2011 11:01 PM

Access to class-attribute by Interface-reference

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