Class.GetName or .InstanceOf(className) in ABAP

Dear all,
how do you realize the java methods/checks
class.GetName or
(Is)InstanceOf(className)
of a current class instance in ABAP OO ?
best regards,
Christoph Aschauer

Hi Christoph
Will it be useful to use RTTI (Run-Time Type Identification)? That is, the class "CL_ABAP_TYPEDESCR" and its subclasses. One of its subclasses (cl_abap_classdescr as I remember) can be used to identify the type of an instantiated object.
Regards
*--Serdar <a href="https://www.sdn.sap.com:443http://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.sdn.businesscard.sdnbusinesscard?u=qbk%2bsag%2bjiw%3d">[ BC ]</a>

Similar Messages

Dynamic class cast and instanceof

I am looking for a way to dynamically test an object for being of a specific class. The instanceof operator can only be used with literally named classes I understand. So you cannot have something like boolean checkClass( Object o, Class c ) {
return o instanceof c;
} Is there any way to do something like this by use of the reflection API? The point is that instanceof only works statically, the reference type being tested for being specified at compile time. The question is whether it can be done with a reference type being specified at run-time, ie dynamically.

There is a collection of parameters of various types, which is passed to some client module.
There should be a, say 'checkParam' method for the client, which checks for existence of a certain parameter by its name, and also specified which class the parameter should have. So it should be called like
checkParam( params, "paramName", String.class )I wanted to avoid hard-coded types, but have the class specified as an argument to this method. I feel like there should be some way to accomplish that. What swingfreak intended may be a way.

What to do with Class.forName(), Class.getName() when Obfuscating

hi,
I have been asked at my company to perform Obfuscation of our project-code, The problem I have been facing is,
We have got too many Class.forName(), Class.getName() calls in our Project-code, which is really hindering the process of Obfuscating all the Classes (refrences in code may break for all these classes which are dynamically being asked for, hence the project may suffer). And it is a pain-in-neck to really resolve which classes to exclude so that code should not break after obfuscation.
What my question is:
Do we have some automated tool to take care of all these Reflection API calls, so that work left to us is minimal?
If not, Do we have some short-cut (program, tool etc.) to identify all the classes which should be excluded?

Which program are you using when obfuscating?
In RetroGuard you can for example avoid certain class names, or packages, to be obfuscated.

Can we run a java class in a external server through abap program?

Dear Experts,
Can we run a java class in an external server ( other than application server and client system )?
I have tried running it in the client system through a program and it works.
But i have the requirement of running it in another system. Can it be done?

Hi,
If this is the case I think you can call this web service from SAP and triger the execution of the application on the "external server".
SAP is behaving as a client in this case.
Another alternative:
"have tried running it in the client system through a program and it works." please elaborate.
Regards.

Reusing Standard Classes for Module pool Programming using Abap Objects

Hi.,
    I debugged the ME21n transaction and found a number of classes such as
         CL_BASIC_MODEL_VIEW_MM
         CL_GENERIC_MODEL_VIEW_MM
         CL_GENERIC_VALUE_MODEL_MM
         CL_MODEL_CONTAINER_MM
         CL_MODEL_CONTROL_VIEW_MM
         CL_MODEL_VIEW_MM
         CL_TABLE_MODEL_MM
         CL_TABLE_MODEL_TREE_VIEW_MM
         CL_VALUE_MODEL_MM
         CL_VALUE_MODEL_VIEW_MM
         CL_BASIC_MODEL_VIEW_MM
        CL_COMPOSITE_SCREEN_VIEW_M
        CL_CUSTOM_CONTROL_VIEW_MM
        CL_EXPAND_BUTTON_VIEW_MM
        CL_EXPAND_VIEW_MM
        CL_FOREIGN_APPLICATION_VIE
        CL_GENERIC_MODEL_VIEW_MM
        CL_GRID_VIEW_MM
        CL_MODEL_CONTROL_VIEW_MM
       CL_MODEL_VIEW_MM
       CL_SCREEN_VIEW_MM
      CL_SETUPVIEW_BUILDER_MM
        CL_SIMPLE_TREE_VIEW_MM
         CL_TABLE_MODEL_TREE_VIEW_M
         CL_TABLE_VIEW_CONTAINER_MM
         CL_TABLE_VIEW_MM
         CL_TABSTRIP_VIEW_MM
         CL_TC_BUTTON_VIEW_MM
         CL_TC_ITEM_VIEW_MM
         CL_TOGGLE_VIEW_MM
         CL_VALUE_MODEL_VIEW_MM
         CL_DEFAULT_CONTROLLER_MM
         CL_CONTROLLER_MM
         CL_ATP_CONTROLLER_MM
         CL_DRAG_DROP_CONTROLLER_MM ..
               How we can reuse these classes to build a custom module pool program which supports MVC architecture as used in enjoy SAP transactions .I am very much confused from where to start .
Guide me on this.I want to create a simple module pool program with Subscreens, Table Controls and Tabstrips ..
Regards.,
S.Sivakumar

Have you got any solution on this.
because i want to use CL_GRID_VIEW_MM->handle_on_data_changed for one of my development related to ME51N.

Preferences...Setting Database Default Directory

i have a JAR file that accesses a database outside of it, but im having a problem of how to put the db in the place that i want it to go. right now its directory is set to C:\Documents and Settings\Alex\.javaphonebook, using this code, from 1 of the classes inside the JAR: String userHomeDirectory = System.getProperty("user.home", ".");
        String systemDirectory = userHomeDirectory + "/.javaphonebook";
        System.setProperty("derby.system.home", systemDirectory);
        File databaseDirectory = new File(systemDirectory);
        databaseDirectory.mkdir(); but what i want is to have the db in the same directory as the JAR (at this point its in D:\Program Files\Java Phonebook) without having to hardcode it, so that my program can be used on different systems in any directory. this what the derectory looks like now: http://www.MyOnlineImages.com/Uploads/Images/3726778475000javaphonebook.bmp and this is what i want it to look like: http://www.MyOnlineImages.com/Uploads/Images/3726867537501javaphonebook2.bmp any help would be appreciated, thnx

ah k. im not too sure how this program works. i read
the commenting but i still have no clue. maybe u
could help me out? :)The VM uses a ClassLoader to load classes from various places (file system, inside JAR files, network, etc).
You can get the ClassLoader object by calling
ClassLoader classLoader = SomeClass.class.getClassLoader();which may be 'null' in which case you use:
classLoader = ClassLoader.getSystemClassLoader();Once you have the ClassLoader, you can ask it for the location of a particular class file:
String className = SomeClass.class.getName();
String classFileName = className + ".class";
URL someClassURL = classLoader.getResource(classFileName);
String urlString = someClassURL.toExternalForm();This gives you a String showing where the class file is located. For a class in a JAR file the String looks something like this:
jar:file:/C:/Junk/jartest.jar!/JarTest.classFor a class file not in a JAR file it might look like this:
file:/C:/Junk/JarTest.classSo, for classes in a JAR file the String starts with "jar:file:/"
You strip off that part using
String filename = urlString.substring(10);which leaves:
C:/Junk/jartest.jar!/JarTest.classDo some more String manipulation to strip off the "!/JarTest.class" leaving:
C:/Junk/jartest.jarOne more bit of String manipulation gets you:
C:/Junkwhich is the directory in which the JAR file is located.
So using only the Class object for a class that you know is in a particular JAR file, you can determine where in the file system that JAR is located, which is also where your database is located.

Java syntax - ClassName.class.method()

ClassName.class.method()
what that mean?
e.g.
String a = Animal.class.getName();
if u know, pls explain in details, that will be grateful, :-)

The ".class" notation is known as a class literal. It evaluates to the Class object for the class mentioned.
So Foo.class gives an instance of java.lang.Class that contains metadata about the class Foo. The ".method()" part is just invoking a method on that Class object (not a Foo object), just like invoking any other method. In this case, it invokes java.lang.Class' getName() method.

ABAP class mapping in PI (7.0)

I just switched from XI (3.0) to PI (7.0).
I tried to move one of my interfaces, but in Interface Mapping there is no "ABAP-class" option. How to use ABAP mapping in PI?

Hi Mariuszu
you need to enable it as described here
in the exchange profile
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/e3ead790-0201-0010-64bb-9e4d67a466b4
or you can ask us directly via mail
Regards,
michal

Major global classes used in abap objects

Hi,
I am new to the abap objects and till now i am to understand that the role of the global classes are important in the abap object program. I had tried to search on the net but i was not able to get the desired result.
I want to know which are the major global classes which are used in the ABAP objects.
Plzz provide me guidelines for it.

Ricx,
It depends on your requirement.
For alv's we use these global classes. For Webdynpro related alv we use different global classes.
CL_GUI_ALV_GRID (List Viewer)
CL_GUI_ALV_GRID_BASE (Basis Class for ALV grid)
CL_GUI_ALV_TREE (ALV Tree Control)
CL_GUI_ALV_TREE_SIMPLE (Simple ALV Tree)
CL_ALV_TABLE_CREATE (Dynamic Creation of ALV Data Table)
CL_ALV_TREE_BASE (Basis Class ALV Tree Control)
CL_CK_ALVTREE_NKEY_2_OBJECT (Converter Node Key Object)
CL_ALV_EVENT_DATA (Changing Data Container for Events)
CL_ALV_EVENT_TOOLBAR_SET (ALV Context menu)
Regards,
Arun.

How to Handle Business Object event in ABAP class

Hello Everybody,
I wanted to know if it was possible to reference BOR objects in ABAP class and handle BOR events in ABAP Objects.
Thanks in advance.

Hi,
Catch the et_VALIDATE event, when InnerEvent = False and ItemChanged = True.
            If pVal.EventType = BoEventTypes.et_VALIDATE Then
                If pVal.InnerEvent = False And pVal.ItemChanged Then
                    'TODO Your code here...
                End If
            End If
Regards,
Vítor Vieira

Calling a java class from abap/bsp

Hello,
I am still learning ABAP. I need to call a java class (a chart drawing library) from ABAP or from a BSP. What is the best way to do that ?
Basically I would create an object, pass data from a database and then get some binary data from that object (an image).
Hope you can help me
Sincerely,
Olivier Matt

/people/gregor.wolf3/blog/2004/08/26/setup-and-test-sap-java-connector-outbound-connection
check the above link and this forum too
Call Java Class and Methods from ABAP

OO Design--do ABAP Persistent Classes make sense for ALV reports in NW2004?

Hello experts,
At our company, we started using ABAP OO in the last year.
I am on NW-2004 . We just acquired a business that is on 4.6C.
We have a lot of customization to bring into our system. There are a lot of reports with common queries that span multiple tables.
I would like to follow the best practice for OO design and create global classes for the data access layer the business logic layer and the UI layer. For the UI layer, I will be utilizing the SALV class, since NW2004 doesn't have ABAP WebDynpro (we don't have a java stack available for development and software change management).
For the data access layer, I would like to use the persistent classes, but without the query manager, it just doesn't make sense.
Thomas Jung said in a blog that he sometimes used SQL to get the keys and then used persistent classes to retrieve the remaining data. But for straight ALV reporting, that just seems inefficient. But it could be that I am just not familiar enough with the technology.
I am looking for suggestions on how to design the data access layer for these intense and commonly used queries.
(Ironically, we will upgrade to NW2004s after this migration -- ouch!)
All ideas are appreciated.
Thanks.

Hi Kimberly,
the main advantage of persistent objects is that their state can be saved in the database. If a persistent object changes in your program, these changes can be reflected in the corresponding database field(s). Thus, persistent objects are very useful when doing CRUD (create, read, update and delete) operations with business objects.
However, if you just want to read data (for simple reporting) but do not plan to implement any of the other CRUD operations, I doubt if a persistency layer is necessary since this causes extra effort during design time and runtime. In that case, simple SELECT statements seem to be more appropriate.
Regards,
David

Abap Class - Friend

Hello Forum,
What is the 'Friend' defined in a Class?
What is its role and how is it used together with Methods?
Any easy to understand materials on Abap class would be greatly appreciated.
Thanks!
Best regards,
S.Patel

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.
Local and Global Classes
Classes in ABAP Objects can be declared either globally or locally. You define global classes and interfaces in the Class Builder (Transaction SE24) in the ABAP Workbench. They are stored centrally in class pools in the class library in the R/3 Repository. All of the ABAP programs in an R/3 System can access the global classes. Local classes are defined within an ABAP program. Local classes and interfaces can only be used in the program in which they are defined. When you use a class in an ABAP program, the system first searches for a local class with the specified name. If it does not find one, it then looks for a global class. Apart from the visibility question, there is no difference between using a global class and using a local class.
There is, however, a significant difference in the way that local and global classes are designed. If you are defining a local class that is only used in a single program, it is usually sufficient to define the outwardly visible components so that it fits into that program. Global classes, on the other hand, must be able to be used anywhere. This means that certain restrictions apply when you define the interface of a global class, since the system must be able to guarantee that any program using an object of a global class can recognize the data type of each interface parameter.
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.
It contains the declaration for all components (attributes, methods, events) of the class. When you define local classes, the declaration part belongs to the global program data. You should therefore place it at the beginning of the program.
If you declare methods in the declaration part of a class, you must also write an implementation part for it. This consists of a further statement block:
CLASS <class> IMPLEMENTATION.
ENDCLASS.
The implementation part of a class contains the implementation of all methods of the class. The implementation part of a local class is a processing block. Subsequent coding that is not itself part of a processing block is therefore not accessible.
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
The following sections describe the structure of classes in more detail.
Class Components
The components of a class make up its contents. All components are declared in the declaration part of the class. The components define the attributes of the objects in a class. When you define the class, each component is assigned to one of the three visibility sections, which define the external interface of the class. All of the components of a class are visible within the class. All components are in the same namespace. This means that all components of the class must have names that are unique within the class.
There are two kinds of components in a class - those that exist separately for each object in the class, and those that exist only once for the whole class, regardless of the number of instances. Instance-specific components are known as instance components. Components that are not instance-specific are called static components.
In ABAP Objects, classes can define the following components. Since all components that you can declare in classes can also be declared in interfaces, the following descriptions apply equally to interfaces.
Attributes
Attributes are internal data fields within a class that can have any ABAP data type. The state of an object is determined by the contents of its attributes. One kind of attribute is the reference variable. Reference variables allow you to create and address objects. Reference variables can be defined in classes, allowing you to access objects from within a class.
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
Methods are internal procedures in a class that define the behavior of an object. They can access all of the attributes of a class. This allows them to change the data content of an object. They also have a parameter interface, with which users can supply them with values when calling them, and receive values back from them The private attributes of a class can only be changed by methods in the same class.
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.
You can declare local data types and objects in methods in the same way as in other ABAP procedures (subroutines and function modules). You call methods using the CALL METHOD statement.
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
As well as normal methods, which you call using CALL METHOD, there are two special methods called CONSTRUCTOR and CLASS_CONSTRUCTOR, which are automatically called when you create an object (CONSTRUCTOR) or when you first access the components of a class (CLASS_CONSTRUCTOR).
Events
Objects or classes can use events to trigger event handler methods in other objects or classes. In a normal method call, one method can be called by any number of users. When an event is triggered, any number of event handler methods can be called. The link between the trigger and the handler is not established until runtime. In a normal method call, the calling program determines the methods that it wants to call. These methods must exist. With events, the handler determines the events to which it wants to react. There does not have to be a handler method registered for every event.
The events of a class can be triggered in the methods of the same class using the RAISE EVENT statement. You can declare a method of the same or a different class as an event handler method for the event <evt> of class <class> using the addition FOR EVENT <evt> OF <class>.
Events have a similar parameter interface to methods, but only have output parameters. These parameters are passed by the trigger (RAISE EVENT statement) to the event handler method, which receives them as input parameters.
The link between trigger and handler is established dynamically in a program using the SET HANDLER statement. The trigger and handlers can be objects or classes, depending on whether you have instance or static events and event handler methods. When an event is triggered, the corresponding event handler methods are executed in all registered handling classes.
Instance Events
You declare instance events using the EVENTS statement. An instance event can only be triggered in an instance method.
Static Events
You declare static events using the CLASS-EVENTS statement. All methods (instance and static methods) can trigger static events. Static events are the only type of event that can be triggered in a static method.
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.
These areas define the external visibility of the class components, that is, the interface between the class and its users. Each component of a class must be assigned to one of the visibility sections.
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
All of the components declared in the protected section are accessible to all methods of the class and of classes that inherit from it. Protected components form a special interface between a class and its subclasses. Since inheritance is not active in Release 4.5B, the protected section currently has the same effect as the private section.
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

Searching for extended ABAP Classes documentation

Hi,
I'm a newbie to this forum (perhaps I'm a newbie in an abap too - with my 1.5 yrs abaping) but I'm interested in a few topics related to classes available in the repository:
1. Where can I find full and detailed info (means description of interfaces both public and private/static) on classes included in a dev.class SLIS, SCET, especially specific ones - currently I'm looking for a documentation on class <cl_alv_changed_data_protocol>, because the info supplied in the repository is not so obviously clear for me.
2. Can someone point me to a SAP cource/academy -name(s) related to the public classes related to a gui programming and!!!! their support-classes (such as mentioned one above) - which is most important.
3. (specific question) In the OO framework(s) I worked with in my background there was a possibility to 'extend' some class' behaviour (usualy adding interface). Is there any possibility in a SAP environment to do this and if yes where can I find a docu/info on how to achieve this? Is this achieved only with a related access key?
4. Please could someone provide me a dev.class names with demo-programs (such as SLIS, SCET) related (mostly) to a GUI-programming?
Perhaps checking the source of the demo-reports supplied in these dev.classes would help me, but occasionaly it's a bit more complicated and time-consuming than to check a related docu, isn't it?
The info-sources I have (and used widely) are:
a) html-documentation with my (ok, our) installation > 4.6C (both integrated into an environment and CHM-help).
b) 'Controls Technology - Workbench edition' - which I would recommend to all the programmers interested in this area.
c) 'An Easy Reference for ALV Grid Control' by Serdar SIMSEKLER (BTW, thank you very, very much Serdar! for providing this reference to the public, I found it very usefull)
d) of cource, the Class Builder via Repository Browser (se80) which usually and unfortunately doesn't report me any class information when asked.
e) occasionaly google-ing the world with a specific question and checking this fourm or some related one(s) in the sap community and in de.alt.comp.sap-r3 newsgroup (unfortunately for me the last one is basicaly with postings in German, which makes it unusable to me).
Perhaps most of you would agree there is a lack of information on these topics. Or, of course, I'm still a newbie and don't know how/where to find it
Please note, answers in sort of 'Feel free to ask with a specific question here...' are not the answer(s) I'm looking for I know this possiblilty and am using it :-).
Finaly, one question off topic and related mostly to the moderators:
Is there an intention or even better a possibility to achieve this forum via NNTP-protocol (means using a standard news-client)? It would be great for me if it's possible or is intended to become possible - I'm using a news-client to track few newsgroups (forums) and it would be great not to switch to a different browser to track this one, which is IMHO the best english-speaking abap-related forum.
Many thanks in advance.
Best Regards,
Ivaylo Mutafchiev
BC Consultant - Abap developer
VBS Ltd.
Varna. Bulgaria
Message was edited by: Ivaylo Mutafchiev

From within SE80 choose menu Environment->Controls Examples. This will lead you to many fine Enjoy Control Example programs.
Also SAP had a class several years ago called BC412 ABAP Dialog Programming Using EnjoySAP Controls. It might still be around in some format.

Java Class - Oracle Stored Procedure - ABAP Program

My client asked me to design a Java Class that calls a Oracle stored procedure. I was a Java developer so I can do that part. Now this Java Class will be called by a ABAP program. All the data that I got from Oracle Stored Procedure should be retuned to the calling ABAP program.
In the past I did use JCA and SAP Connectors to get data from SAP R3 by calling BAPI programs.
I would like to know if the ABAP program uses JCO or the latest JCA based SAP Connectors. Any advice on how I should structure my Java Program is welcome. I do know from pure Java side how to get data from Oracle database using JDBC.

Hi venkat,
This link(PDF) gives good info about JCO.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/c63bca90-0201-0010-59ae-e0db32750209
JCO is used as two way communication between JAVA and R/3. so for yours JCO may be the suitable one.
regards,
P.Venkat
Message was edited by: venkataramanan

Class.GetName or .InstanceOf(className) in ABAP

Similar Messages

Maybe you are looking for