Detecting changes in class attributes

Hi,
I am trying to find the best way to do the following.
I have a class that has multiple attributes which can be access via getters and setters. I would like to persist this object in LDAP (I have my reasons) and would like to only persist the changes. Now I would like to do a Hibernate like service, where you define the attributes etc and then access them via the class, but I would like to be able to detect when a change has been made to the attributes and only persist those changes.
Is this possible to do? I was thinking using AOP to insert rules on the attributes at runtime and add a Map that contained the original and new value and what the change actually was i.e update, delete, add and then write the update as required.
This is mainly for 1.4.x

No, what I am trying to do is this.
I have a class that I know the fields I want to track / monitor for changes, and then have a method that I can call to find out if the class is 'dirty' i.e. there has been a change to one or more of the fields I am tracking / monitoring.
Once I know the class is dirty (it has been updated) I want to find out those fields that have changed and make a modification / addition / deletion request.
I think AOP is the way to go, but I am not sure.....
This is not for new object that I am not aware of, as the data has not been persisted yet. This is for new objects I construct and return to the user.
Message was edited by:
nirving

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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
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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,
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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.

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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.
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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:
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FIELD-SYMBOLS:
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**           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

Detecting changes

hi folks,
I have a swing application that has a functionality to save the input. I want to know what is the common way to detect modification of input. If there's modification, i want to prompt the user to save if he/she is closing down the app. I'm thinking about using a listener on all input components(JTextField, JList, JComboBox,JTable,JButton). But the listener would be different for each type of component, ActionListener for JButton, CaretListener for JTextField, ListSelectionListener for JList, ect. So I want to write a class that implements all these Listeners, and if any of those events is triggered, then I know there's modification been made.
My question is: is there a better/more efficient/more elegant way of detecting changes in my app?
If not, any comments on my approach?
thanks!!

You can write an unique class implementing DocumentListener, ActionListener, ItemListener, etc..
But you still have to add the listener to all the components.
I'm thinking you can write a method void register(JComponent pane) Depending on the class JTextField,JCheckBox, etc... you add the class as a DocumentListener,
as an ActionListener, etc. If the component is a container, you can recursively invoke the method
for all the children

Changeing Valuation class-what happens to deleted open docs.

Hello,
we are planning to change the valuation class for material. In order to change the class we would have to delete all open items that trace back to the material (PO, GR, IR). I run me2m to identify the open documents for that material.
My issue is when I reverse or delete the IR, GR, and PO what happens to the those documents.? We have documents that go back to 2007.
Do we have to recreate the PO, GR, IR after we change the class.?What are the long term effects when doing this change (Audit)?
Please advise.
Thanks.

You don't need to worry about old documents as long as they are not open.
You just need to invoice out all the open GRs or cancel all those GRs. In case of POs, you have to ensure the GR qty is equal to IR qty for each PO line, then you can mark the line as deleted so that the system will allow you to change the val. class. You also need to make the stock to zero.
Once val. Class is changed, you can undo all the above.

Error while changing the Display Attribute into Navigational Attribute

Hi all.. Gud Mrng.
I was changed the attribute (product) from display attribute into navigational attribute and while save and activating the info object it is not getting activated and it is throwing the below error message.
Error Message: u201CThe Info object is being used in several data targetsu201D
My Questions:
i) Do I need to delete the data from all the data targets (where this info object is using)??
ii) Do I need to delete data only from the main info object (Zmaterial)? Is this single action enough?
Please suggest me which action I need to follow & What are the precautions need to take while changing the Display Attribute (product) into Navigational attribute of info object (Zmaterial).
Thanks in advance.
Thanks & Regards,
B Venugopal

Hi Garima
Only in case of key figures we cannot change it from display to navigational.
If the info object is a characteristics then in the General tab of the info object if you select 'attribute only' then the iobj would be a display attribute only. If you leave it unmarked then you can use the iobj as a navigational atribute.
I am sure you know that these settings only mean if a IOBJ can be used as display or navigational. To use it as a navigational within another object you will have to change the settings from 'DIS' to 'NAV' for the said info object in the 'Attributes' tab of its parent info object.
Further if you use the parent info object in any data target / infio provider you will have to further mark the info object as 'navigational' while defining the attrbute of the said data target / info provider. The info object gets displayed in the data target / info provider attribute properties as 'parent IOBJ_info object'
Cheers
Umesh

How to change Valuation class in material master(have stock)

HI,
I would like to change the valuation class in material master, How to change VC? is there any process before changing VC?
I heared when Material have nil stock then only it's possible to change VC, Is it correct? which TC can I use for change VC?
Regards,
venki

Dear venki,
To change Valuation class you must have zero stock in the current period, and zero stock at the end of the last period, plus no open PO lines . flag for deletion all open PO lines,
Regards
shankar

Detecting changes in class attributes

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