We all know the ASSIGN COMPONENT name OF STRUCTURE TO <dest> command. I would like to use this command to access public attributes of classes. But according to the documentation (and unfortunately also my debugger), this does not work for classes.
Is there any possiblity to do that? Using classes, it always returns sy-subrc = 4.
Assuming that your reference variable is LR_FOO and the attribute name is BAR, you can use ASSIGN ('LR_FOO->BAR') TO <dest>.
Related
I'm setting up a Method call from a class
DATA: r_info TYPE REF TO zcl_sv_job_offline_ctrl.
CALL METHOD r_info->create
EXPORTING
is_data = lr_test_record.
And receiving the following errors:
CX_SY_REF_IS_INITAL
You are trying to access a component with a 'ZERO' object reference (points to nothing). Variable: "R_INFO".
Am I missing something?
You missed to create the object.
so you need to to:
create object r_info.
or
r_info = new zcl_sv_job_offline_ctrl( ).
or if there is a "factory method" ( what your 'create' method indicates )
r_info = zcl_sv_job_offline_ctrl=>create( is_data = lr_test_record ).
Your Exception tells you that the reference ( r_info ) is not connected with an object on the heap. So you need to do one of the above steps and then it should work. ( depending on your class )
Sorry, I don't have the rep to comment just yet...
I notice that your class is a Z so I'm wondering if you are trying to create a singleton class. In which case. Your 'Create' should be static. Your Constructor private and your Instance in a private attribute.
From the other comments, I agree, your question is missing some key details to provide an accurate answer.
If IO_DISPATCHER is part of the constructor and you are unable to pass a value, you need to dig a little deeper into the purpose of the class. See if you can give it what it wants. Try a 'where used' and check out the other usages of the class. You might find you are looking at the wrong class, or at least approaching from the wrong direction.
If create is some method on the class and it is not static then you will never get it to work until you create an instance of the class.
Another thought that comes to mind is that you might be in the right place and just doing the wrong thing. Check your globals to see if there is already an instance of the class and you are trying to access something via declaration as data rather than using the global instance??
All guess work without more details.
Thanks all.
The solution was simply to instantiate the parent classes (properly), enabled me to instantiate the class in question.
I used the CRUD generator from a legacy database. When searching for a column value I get the following error:
htmlspecialchars() expects parameter 1 to be string, array given (/usr/local/share/yii/framework/web/helpers/CHtml.php:103)
The problem is that the model has an existing column named "attributes" which is creating a conflict. I removed the entry from the _search.php and commented out all instances in the model hoping to at least get it working but no luck. Any suggestions would be appreciated.
Thanks.
Every CActiveRecord instance (or CModel instance for that matter) has a getter/setter named attributes with which all the attributes can be set. This leads to a conflict because the generated crud code uses the attributes attribute expecting it works as described before.
The controller does something like:
$model->attributes=$_POST['ModelClassName'];
// or
$model->attributes=$_GET['ModelClassName'];
This is meant to set al the (safe) attributes of the model at once. Instead this overwrites the database attribute attributes of your legacy DB model.
This in turn leads to the error you describe, because $_GET['ModelClassName'] and $_POST['ModelClassName'] typically contain arrays of data.
I guess the easiest fix would be to directly call the setter function for the "normal" attributes behavior which would lead to replacing the lines mentioned above with something like the following:
// in the controller
$model->setAttributes($_POST['ModelClassName']);
// and
$model->setAttributes($_GET['ModelClassName']);
I think rest of the generated CRUD code (the views) could and should be left untouched to make it work.
If you want to know how and why this works, it's best to do some research into the __get and __set magic functions and how they're used in the yii framework.
I have a program ZPROG1_TEST where I define a local class LCL_PROG1_HELPER.
I have a second program ZPROG2_TEST where I'd like to define a variable reference to this class.
Isn't there a syntactic possibility for me to do this?
Or could this be in theory doable with the RTTI classes like CL_ABAP_CLASSDESCR ?
EXTRA
Why I'd like to do this is because I have a custom form ZMM_MEDRUCK that needs to know if the ME32N Document it's printing has been changed but not saved.
I've figures out the exact objects whose properties I need to interogate, but some of them are defined at design time as common interfaces, like IF_SERIALIZABLE_MM, and I need to cast them to the local classes whose instances I know these objects are going to be, like \FUNCTION-POOL=MEGUI\CLASS=LCL_APPLICATION.
I could of course try a dynamic method call and not care about anything, but since i'm here i thought i'd ask this thing first.
You could do it like that.
REPORT ZPROG1_TEST.
INTERFACE lif_prog1_helper.
METHODS:
test.
ENDINTERFACE.
CLASS LCL_PROG1_HELPER DEFINITION.
PUBLIC SECTION.
INTERFACES:
lif_prog1_helper.
ALIASES:
test FOR lif_prog1_helper~test.
ENDCLASS.
CLASS LCL_PROG1_HELPER IMPLEMENTATION.
METHOD test.
WRITE / sy-repid.
ENDMETHOD.
ENDCLASS.
REPORT ZPROG2_TEST.
DATA: g_test TYPE REF TO object.
START-OF-SELECTION.
CREATE OBJECT g_test TYPE ('\PROGRAM=ZPROG1_TEST\CLASS=LCL_PROG1_HELPER').
CALL METHOD g_test->('TEST').
CALL METHOD g_test->('LIF_PROG1_HELPER~TEST').
As far as I know, this is not possible. Accessing the local class dynamically is easy (well, relatively easy), but referring to it statically - not as far as I know. You'll probably have to call the methods dynamically.
abstract class Base {}
class A extends Base
class B extends Base
How do I find all places in the code that create Base? (that is, have either new A() or new B())
UPDATE
To make it clear, the above is just and example. I'm interested in a way of searching for object creation of any class, including 3rd party classes that I don't control.
Using Structural Search (Edit -> Find -> Search Structurally):
Create a template: new $Type$($P$)
Edit Type variable: type Base in the text field, check 'Apply constraint within type hierarchy', check 'This variable is target of the search'
Edit P variable: type .* in the text field, set Minimum count to 0, check Unlimited under Maximum count.
Voila!
IttayD if I have understood correctly your latest update, what I normally do (IntelliJ 9.0.4) if I have a similar need to yours is Right click on class name and do "Find Usages" and this will list results in the form of usage categories,
Variable declaration
New Instance creation, to name a few.
As far as I'm aware I do not think there is a specific option/selection choice to fulfill such a usage search check. Thanks
You can create empty default constructor of Base and press Ctrl+Alt+H (Hierarchy Callers). Then you'll see all creations of A and B in as a tree.
Is setX() method name appropriate for only for setting class property X?
For instance, I have a class where the output is a string of an html table. Before you can you can call getTable, you have to call setTable(), which just looks at a other properties and decides how to construct the table. It doesn't actually directly set any class property -- only causes the property to be set. When it's called, the class will construct strHtmlTable, but you can't specify it.
So, calling it setTable breaks the convention of get and set being interfaces for class properties.
Is there another naming convention for this kind of method?
Edit: in this particular class, there are at least two ( and in total 8 optional ) other methods that must be called before the class knows everything it needs to to construct the table. I chose to have the data set as separate methods rather than clutter up the __construct() with 8 optional parameters which I'll never remember the order of.
I would recommend something like generateTable() instead of setTable(). This provides a situation where the name of the method clearly denotes what it does.
I would probably still use a setTable() method to actually set the property, though. Ideally, you could open the possibility of setting a previously defined table for further flexibility.
Yes, setX() is primarily used for setting a field X, though setX() may have some additional code that needs to run in addition to a direct assignment to a field. Using it for something else may be misleading to other developers.
I would definitely recommend against having a public setTable() and would say that setTable() could be omitted or just an unused private method depending upon your requirements.
It sounds like the activity to generate the table is more of a view of other properties on the object, so you might consider moving that to a private method on the object like generateHtmlTable(). This could be done during construction (and upon updates to the object) so that any subsequent calls to getTable() will return the the appropriate HTML.