[WF Attributes] DDIC vs ABAP class

Hi,
I am having a hard time understanding which CL (ABAP Class) does not behave like DDIC structure.
I use both in my Workflow but I cannot manage to pass data (meaning reference) and trigger the Workflow
- from the FM 'SAP_WAPI_START_WORKFLOW'
- from an event
Am I forced to use the IF_WORKFLOW (I don't see why I have to use the FIND_BY_LPOR method ??) ?
-> if the static method FIND_BY_LPOR is returning the value, what has gone all the job in the first place ?)
I have simply created a customer-specific class that would avoid me adding new structure to the Workflow container and the Workflow Tasks again and again... simply extend the class and the element will all follow.
Many thanks in advance for your help.
Best regards,
Guillaume

Hello Guillaume,
I know this is closed but an interesting discussion nevertheless. The first part I am confused about is what exactly you are trying to accomplish and why:
>
Guillaume Garcia wrote:
I have simply created a customer-specific class that would avoid me adding new structure to the Workflow container and the Workflow Tasks again and again... simply extend the class and the element will all follow.
Why can you not do this with a DDIC structure? I use this a lot. Particularly useful if you work with MOVE CORRESPONDING in your code. Just extend the structure and new fields are automatically transported (if they exist in the DB of course).
OO in WF is generally used in the same way as a BOR. The distinction is Business Object versus an OO class as you would use in an ABAP program.
>
Karri Kemppi wrote:
As far as I know (and understand your point) it is not possible. Maybe someone disagrees with me, but I am happy to hear about that. The object instantiates itself whenever it is needed in the workflow. And during the instantiation you need to populate the attributes of the object, etc...
Correct, but.... if you are really determined, there are some tricks you can use: Who cares whether your object really exists in the DB, as long as your FIND_BY_LPOR always returns an instance. If this is always the same instance it can work. The thing to be careful of is that you MUST have an unbroken chain of tasks that execute in the same logon/RFC session. Once that session ends (e.g. by switching users/background tasks) the data is gone. Needless to say you need to know exactly what you're doing.
Cheers,
Mike

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Hi
Classes
LIKE-Zusatz
Classes are templates for objects. Conversely, you can say that the type of an object is the same as its class. A class is an abstract description of an object. You could say that it is a set of instructions for building an object. The attributes of objects are defined by the components of the class, which describe the state and behavior of objects.
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The following sections describe how to define local classes and interfaces in an ABAP program. For information about how to define local classes and interfaces, refer to the Class Builder section of the ABAP Workbench Tools documentation.
Defining Local Classes
Local classes consist of ABAP source code, enclosed in the ABAP statements CLASS ... ENDCLASS. A complete class definition consists of a declaration part and, if required, an implementation part. The declaration part of a class <class> is a statement block:
CLASS <class> DEFINITION.
ENDCLASS.
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CLASS <class> IMPLEMENTATION.
ENDCLASS.
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Structure of a Class
The following statements define the structure of a class:
A class contains components
Each component is assigned to a visibility section
Classes implement methods
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Class Components
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Attributes
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Instance Attributes
The contents of instance attributes define the instance-specific state of an object. You declare them using the DATA statement.
Static Attributes
The contents of static attributes define the state of the class that is valid for all instances of the class. Static attributes exist once for each class. You declare them using the CLASS-DATA statement. They are accessible for the entire runtime of the class.
All of the objects in a class can access its static attributes. If you change a static attribute in an object, the change is visible in all other objects in the class.
Methods
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The definition and parameter interface of a method is similar to that of function modules. You define a method <met> in the definition part of a class and implement it in the implementation part using the following processing block:
METHOD <meth>.
ENDMETHOD.
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Instance Methods
You declare instance methods using the METHODS statement. They can access all of the attributes of a class, and can trigger all of the events of the class.
Static Methods
You declare static methods using the CLASS-METHODS statement. They can only access static attributes and trigger static events.
Special Methods
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Events
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Instance Events
You declare instance events using the EVENTS statement. An instance event can only be triggered in an instance method.
Static Events
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See also Triggering and Handling Events.
Types
You can define your own ABAP data types within a class using the TYPES statement. Types are not instance-specific, and exist once only for all of the objects in a class.
Constants
Constants are special static attributes. You set their values when you declare them, and they can then no longer be changed. You declare them using the CONSTANTS statement. Constants are not instance-specific, and exist once only for all of the objects in a class.
Visibility Sections
You can divide the declaration part of a class into up to three visibility areas:
CLASS <class> DEFINITION.
PUBLIC SECTION.
PROTECTED SECTION.
PRIVATE SECTION.
ENDCLASS.
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Public Section
All of the components declared in the public section are accessible to all users of the class, and to the methods of the class and any classes that inherit from it. The public components of the class form the interface between the class and its users.
Protected Section
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Private Section
Components that you declare in the private section are only visible in the methods of the same class. The private components are not part of the external interface of the class.
Encapsulation
The three visibility areas are the basis for one of the important features of object orientation - encapsulation. When you define a class, you should take great care in designing the public components, and try to declare as few public components as possible. The public components of global classes may not be changed once you have released the class.
For example, public attributes are visible externally, and form a part of the interface between an object and its users. If you want to encapsulate the state of an object fully, you cannot declare any public attributes. As well as defining the visibility of an attribute, you can also protect it from changes using the READ-ONLY addition.
Refer the following link
http://help.sap.com/saphelp_nw04/helpdata/en/c3/225b5c54f411d194a60000e8353423/frameset.htm

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Got from a link
Downloading ABAP code to your local PC
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First, what is the difference between all these classes compare to the traditional abap code.
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Regards,
Anyi

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- Head First: Object-Oriented Analysis & Design
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<a href="http://www.headfirstlabs.com/index.php">here.</a>
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Dear Poster,
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[WF Attributes] DDIC vs ABAP class

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