Calling a super.ssuper.method but your super is a abstract class.
Dear guys,
Is that possible to invoke your super's super's method but your super is a abstract class?
like:
class GO { public void draw() { } }
abstract class GORunner extends GO {}
class GOCounter extends GORunner {
public void draw() {
super.super.draw();
I want to do this because I would like to take advantages of the abstract as an layer to achieve some polymorphism programming Therefore, in the later stage of the programming some code may only refer to GORunner but actually it is holding a GOCounter object.
Thank!!
BTW you don't need to write this
public void draw() {
super.draw();
}It works but its basically the same as not having it at all.
Similar Messages
-
I have a parent class with a sub-vi Override.vi, and a child which overrides this sub-vi. I create an instance of this child. I cast this child to it's parent class and store it in an array. Later, if I invoke the parent's 'Override.vi' on this child (casted to parent) then Labview 2013 seems to randomly choose whether to run the parent or the child override.vi. In Labview 2011 SP1 it would always call the childs version of override.vi (which while surprising to me was very useful). This has totally broken an application I have been developing, any insight as to how to control which override.vi is run would be helpful (re-casting to the child class isn't really an option, as there are in fact many child classes each with their own version of override.vi).
The actual data type of the wire is irrelevant in deciding which VI to run. The only thing that is relevant is the class of the object which is actually on the wire, so casting to the parent should not be relevant. *IF* the object really is a child, then LV should always call the child's VI, just like you say it works in 2011.
I suspect that what's happening in your case is that somewhere you're generating a parent and that's what's actually on the wire (e.g. maybe you have an error somewhere and a function outputs the default value, which is a parent). The fact that it didn't happen in 2011 doesn't mean it's a bug in 2013. It could be that something else has changed.
In any case, it's impossible to tell whether this is a misunderstanding, a bug in your code or a bug in LV without actual code. If you can post actual code which shows this, people can help. Otherwise (if it only happens in code you don't want to publish), you should try contacting NI directly so that you can at least show them the code.
Try to take over the world! -
Protected methods in abstract classes
Hello All
I have some problem which I cannot find a workaround for.
I have three classes:
package my.one;
public abstract class First {
protected void do();
protected void now();
package my.one;
public class NotWantToHave extends First {
protected First obj;
public NotWantToHave(First O) { obj = O; }
public void do() { obj.do(); }
public void now() { obj.now(); }
package my.two;
public class Second extends my.one.First {
protected void do() { System.out.println("Second does"); }
protected void now() { System.out.println("Second does now"); }
package my.three;
public class Three extends my.one.First {
protected my.one.First obj;
public Three(my.one.First O) { obj = O; }
protected void do() { System.out.println("Doing"); }
protected void now() { obj.now(); } // Not possible, see later text
Problem is, as one can read in http://java.sun.com/docs/books/tutorial/java/javaOO/accesscontrol.html , it says that you cannot access protected members and methods from classes if they are in a different package. However, since my class Three should not concern about the method now() but should use from some other class that implements (i.e. class Second), the question I have is how to do?
One way would be to implement a class that simply make a forward call to any protected method in the same package the abstract class is in like in class NotWantToHave and pass it to the constructor of class Third while this class was created with an instance of class Second. However, such a call would look very clumsy (new my.three.Third(new my.one.NotWantToHave(new my.two.Second()));). Furthermore, everyone could create an instance of class NotWantToHave and can invoke the methods defined as protected in class First, so the access restriction would be quite useless.
Does anyone has a good idea how to do?Hi
One way I found is to have a nested, protected static final class in my super-class First and provide a protected static final method that returns a class where all methods of the super-class are made public and thus accessible from sub-classes at will. The only requirement is that a sub-class must invoke this method to encapsulate other implementations of the super-class and never publish the wrapper class instance. This will look as follows:
package my.one;
public abstract class First {
protected final static class Wrap extends First { // extend First to make sure not to forget any abstract method
protected First F;
public void do() { F.do(); }
public void now() { F.now(); }
protected Wrap(First Obj) { F = Obj; }
} // end Wrap
protected final static First.Wrap wrap(First Obj) { return new First.Wrap(Obj); }
protected abstract void do();
protected abstract void now();
} // end First*******
package my.two;
public class Second extends my.one.First {
protected void do() { System.out.println("Second does"); }
protected void now() { System.out.println("Second does now"); }
} // end Second*******
package my.three;
public class Three extends my.one.First {
protected my.one.First.Wrap obj;
public Three(my.one.First O) { obj = my.one.First.wrap(O); }
protected void do() { System.out.println("Doing"); }
protected void now() { obj.now(); } // Not possible, see later text
} // end Third*******
In this way, I can access all methods in the abstract super class since the Wrap class makes them public while the methods are not accessible from outside the package to i.e. a GUI that uses the protocol.
However, it still looks clumsy and I would appreciate very much if someone knows a more clear solution.
And, please, do not tell me that I stand on my rope and wonder why I fall down. I hope I know what I am doing and of course, I know the specification (why else I should mention about the link to the specification and refer to it?). But I am quite sure that I am not the first person facing this problem and I hope someone out there could tell me about their solution.
My requirements are to access protected methods on sub-classes of a super-class that are not known yet (because they are developed in the far, far future ...) in other sub-classes of the same super-class without make those methods public to not inveigle their usage where they should not be used.
Thanks -
Dynamic call of a static method of an static attribute
Hi all,
is it possible to call dynamically a static method of a static attribute of a class.
The statement without dynamic call would look like this:
cl_test_class=>static_attribute=>static_method( ).
I would like to do it like this:
('CL_TEST_CLASS')=>static_attribute=>static_method( ).
Netiher the one nor the other way works for me - I'm getting the error "The notation used is reserved for business object classes".
Regards, StefanI guess, it is not possible to call method using the short form (parameters in brackets) is not possible in Dynamic Access. You may need to get the attribute first and then call the method.
CLASS lcl_main DEFINITION.
PUBLIC SECTION.
CLASS-DATA: o_same TYPE REF TO lcl_main.
METHODS: run.
ENDCLASS. "lcl_main DEFINITION
CLASS lcl_main IMPLEMENTATION.
METHOD run.
WRITE: 'success'.
ENDMETHOD. "run
ENDCLASS. "lcl_main IMPLEMENTATION
START-OF-SELECTION.
DATA: lo_same TYPE REF TO lcl_main.
CREATE OBJECT lcl_main=>o_same.
* lcl_main=>o_same=>run( ).
TRY.
FIELD-SYMBOLS: <fs> TYPE REF TO lcl_main.
ASSIGN ('LCL_MAIN')=>('O_SAME') TO <fs>.
CALL METHOD <fs>->('RUN').
CATCH cx_root.
ENDTRY.
Regards,
Naimesh Patel -
Why does this abstract class and method work without implement it?
hi,
I have seen many times that in some examples that there are objects made from abstract classes directly. However, in all books, manual and tutorials that I've read explain that we MUST implement those methods in a subclass.
An example of what I'm saying is the example code here . In a few words that example makes Channels (java.nio.channel) and does operations with them. My problem is in the class to make this channels, because they used the ServerSockeChannel class and socket() method directly despite they are abstracts.
// Create a new channel: if port == 0, FileChannel on /dev/tty, else
// a SocketChannel from the first accept on the given port number
private static ByteChannel newChannel (int netPort)
throws Exception
if (netPort == 0) {
FileInputStream fis = new FileInputStream ("/dev/tty");
return (fis.getChannel());
} else {
//CONFLICT LINES
ServerSocketChannel ssc = ServerSocketChannel.open(); //<--I have never thought do that!! Anyway, how it is static method may work.
ssc.socket().bind (new InetSocketAddress (netPort)); //<--but here, this method (socket) is abstract. WHY RETURN A SOCKET???????? this mehod should be empty by default.
System.out.print ("Waiting for connection on port "
+ netPort + "...");
System.out.flush();
ByteChannel channel = ssc.accept();
ssc.close();
System.out.println ("Got it");
return (channel);
} I test this code and works fine. So why can it be??
Also, I read that the abstract classes can't have static methods. Is it true???
Please Help!!
PS: i have seen this kind of code many times. So i feel that I don't understand how its really the abstract methods are made.
PS2: I understand that obviously you don't do something like this: *"obj = new AbstractClass(); "*. I dont understand how it could be: ServerSocketChannel ssc = ServerSocketChannel.open(); and the compiler didn't warn.molavec wrote:
ServerSocketChannel ssc = ServerSocketChannel.open(); //<--I have never thought do that!! Anyway, how it is static method may work.
The static method creates an instance of a class which extends ServerSocketChannel, but is actually another non-abstract class.I thought that, but reading the documentation I saw that about open() method:
Opens a server-socket channel.
The new channel is created by invoking the openServerSocketChannel method of the system-wide default SelectorProvider object.
The new channel's socket is initially unbound; it must be bound to a specific address via one of its socket's bind methods before connections can be accepted.
...and the problem is the same openServerSocketChannel is abstract, so i don't understand how it could return a ServerSocketChannel.There is a concrete implementation class that has implemented that method.
I guess that really the open() method use a SelectorProvider's subclase but it doesn't appear in the doc.It doesn't need to. First, you don't care about those implementation details, and second, you know that if the class is abstract, it must use some concrete subclass.
Ok, I speak Spanish by default (<-- this sounds like "I am a machine", ^_^' ). So, I didn't know how to say that the method would be {}. Is there a way to say that?? I recommendable for me to know, for the future questions o answers.Not sure what you're saying here. But the other respondent was trying to explain to you the difference between an abstract method and an empty method.
// abstract method
public abstract void foo();
// empty method
public void bar() {
Which class does extend ServerSocketChannel? I can not see it.It may be a package-private class or a private nested class. There's no need to document that specific implementation, since you never need to use it directly. -
Calling a method from a super class
Hello, I'm trying to write a program that will call a method from a super class. This program is the test program, so should i include extends in the class declaration? Also, what code is needed for the call? Just to make things clear the program includes three different types of object classes and one abstract superclass and the test program which is what im having problems with. I try to use the test program to calculate somthing for each of them using the abstract method in the superclass, but its overridden for each of the three object classes. Now to call this function what syntax should I include? the function returns a double. Thanks.
Well, this sort of depends on how the methods are overridden.
public class SuperFoo {
public void foo() {
//do something;
public void bar(){
//do something
public class SubFoo extends SuperFoo {
public void foo() {
//do something different that overrides foo()
public void baz() {
bar(); //calls superclass method
foo(); //calls method in this (sub) class
super.foo(); //calls method in superclass
}However, if you have a superclass with an abstract method, then all the subclasses implement that same method with a relevant implementation. Since the parent method is abstract, you can't make a call to it (it contains no implementation, right?). -
iphone 4s is working for example can play,music recieve texts ,calls ect but has black screen and have tried the force shutdown method but still can see what im doing on the screen
Did anything happen to prior to your phone acting this way? It sounds like your screen is dead, but it is hard to say without knowing what what the cause.
1) was this a gradual problem? Did the phone screen start dimming a couple months ago and now has degraded or after some event (known or unknown to you), the phone started behaving this way.
2) Can you give more specifics on the problem? You said you have a black screen, but also you can see what you're doing on screen. Is the screen just really dim? Is the screen completely black? Does anything else besides attempting to reset the device cause it to flash white? -
I have tried to update my iPhone using the iTunes method but it will not work. The message "The iTunes update server could not be contacted. Please check your internet connection or try again later," appears. What do I do? The Internet is working fine.
Have you tried the following troubleshooting document?
iTunes for Windows: iTunes cannot contact the iPhone, iPad, or iPod software update server
If you end up using the If the iTunes Store opens successfully section of the document, and the "Automatically detect settings" checkbox is already checked, try unchecking and rechecking it and clicking OK. -
Hi, i have a small issed ever since i owned this desk top. whenever i do an update it always tels me thatThere was a problem installing this update to your super drive?
Hey bdkj,
What I meant was I copied back the user/cindy/library/mail folder contents from the laptop backup so as to resurrect my Mail boxes, accounts, emails.
bdkj I emptied & trashed the caches as you suggested, still no luck.
I've also noticed as soon as Mail starts to lock up and show declining 30gigs on my drive, I disconnect the internet, quit Mail and my laptop seems to come back to normal. One weird thing...during the Mail glitch when I watch my drive drop from 30gig available to 28 to 25...once Mail is closed and I go on with word processing, browsing, my drive numbers come back up to the 30gigs actually available. Is this weird or what? The entire Mail crap out/quit Mail/drive returns to 30gigs all takes about 2 minutes to transpire. Thank you
Cindy -
Recently bought pro retina 15" with a super drive. But when I played a dvd the quality wasn't very good, any suggestions?
There is a good chance that the DVD is OK and the machine is OK since a DVD's resolution is set for a television and not for a computer with a resolution 4 times that of the tele (at least).
What are you using to play DVD?
What is the DVD and what does it say on the cover about resolution or aspect ratio?
Just because you have a retina Mac doesn't mean you will get an excellent picture from low resolution media, if you are using DVD player use the menu option for 'Actual Size' this will play it at the resolution for the DVD, any larger then it will start to pixelate. -
Thanks !
Kudos always welcome for helpful postsRe: I have a VI A. I want A to call another VI B and execute. After B executes, I want it to close automatically and go back to A. Is this possible ? I tried using open reference and those methods, but I am not able to do it. Can someone help me ? Thanks !Hi Stephan ! Thanks ! I guess I explained my question not so right. I've created a customized menu and at the instance of me selecting a menu, a VI should load itself dynamically. I am using call by reference. Sometimes it works and sometimes it won't. In short, what I want to achieve is load VIs dynamically and close them dynamically once they finish executing. Thanks !
Kudos always welcome for helpful posts -
How to use super.finalize method?
Hi,
pls guide how to use super.finalise ( ) method ?
Regards,
Pavanihttp://www.janeg.ca/scjp/gc/finalize.html
Armin -
Abstract classes and constructors - cannot call abs. methods in CONSTRUCTOR
Let me explain the scenario:
I'm building a program in which I need to read a file (among other things) and I intend to use object orientation to it's fullest in doing so. I thought of creating an abstract FILE class which has the commonalities, and two subclasses SERVER_FILE and PC_FILE, which implement the abstract method GET_CONTENTS in different ways (OPEN DATASET / GUI_UPLOAD), same for the CHOOSE method which allows to select the file from it's corresponding source.
Initially I've used an interface but since another tasks like setting the file path are common for both, switched to an ABSTRACT class.
Now, the problem is, from the main code I intend to use a FILE reference to handle either type of file. At the instantiation moment I'd like the path attribute to be set; if it was not set by parameter, i'd like to call the CHOOSE method which is abstract for the superclass. Since this is common for either subclass, I need a way to code it once in the superclass. But I get an error because the CHOOSE method is abstract.
This is the problem code (extracts):
* CLASS lcl_file DEFINITION
CLASS lcl_file DEFINITION ABSTRACT.
PUBLIC SECTION.
METHODS:
constructor
IMPORTING
i_path TYPE string OPTIONAL
EXCEPTIONS
no_path_chosen,
get_contents ABSTRACT
RETURNING
value(rt_contents) TYPE string_table
EXCEPTIONS
read_error.
PROTECTED SECTION.
DATA:
_v_path TYPE string.
METHODS:
choose ABSTRACT
EXCEPTIONS
no_path_chosen,
set_path
IMPORTING
i_path TYPE string.
ENDCLASS. "lcl_file DEFINITION
* CLASS lcl_file IMPLEMENTATION
CLASS lcl_file IMPLEMENTATION.
METHOD constructor.
IF i_path IS SUPPLIED.
CALL METHOD set_path
EXPORTING
i_path = i_path.
ELSE.
*---->>>> PROBLEM CALL - CAN'T BE DONE!!
CALL METHOD choose
EXCEPTIONS
no_path_chosen = 1.
IF sy-subrc = 1.
RAISE no_path_chosen.
ENDIF.
ENDIF.
ENDMETHOD. "constructor
METHOD set_path.
_v_path = i_path.
ENDMETHOD. "set_path
ENDCLASS. "lcl_file IMPLEMENTATION
* CLASS lcl_server_file DEFINITION
CLASS lcl_server_file DEFINITION
INHERITING FROM lcl_file.
PUBLIC SECTION.
METHODS:
get_contents REDEFINITION.
PROTECTED SECTION.
METHODS:
choose REDEFINITION.
ENDCLASS. "lcl_server_file DEFINITIO
* CLASS lcl_server_file IMPLEMENTATION
CLASS lcl_server_file IMPLEMENTATION.
METHOD choose.
DATA:
l_i_path TYPE dxfields-longpath,
l_o_path TYPE dxfields-longpath.
CALL FUNCTION 'F4_DXFILENAME_TOPRECURSION'
EXPORTING
i_location_flag = 'A' " Application server
i_path = l_i_path
fileoperation = 'R' " Lectura
IMPORTING
o_path = l_o_path
EXCEPTIONS
rfc_error = 1
OTHERS = 2.
IF sy-subrc = 0 AND l_o_path <> l_i_path.
MOVE l_o_path TO _v_path.
ELSE.
RAISE no_path_chosen.
ENDIF.
ENDMETHOD. "choose
METHOD get_contents.
DATA: l_line LIKE LINE OF rt_contents,
l_osmsg TYPE string.
CHECK NOT _v_path IS INITIAL.
OPEN DATASET _v_path FOR INPUT
IN TEXT MODE
MESSAGE l_osmsg.
IF sy-subrc <> 0.
MESSAGE e000(oo) WITH l_osmsg
RAISING read_error.
ELSE.
DO.
READ DATASET _v_path INTO l_line.
IF sy-subrc = 0.
APPEND l_line TO rt_contents.
ELSE.
EXIT.
ENDIF.
ENDDO.
CLOSE DATASET _v_path.
ENDIF.
ENDMETHOD. "get_contents
ENDCLASS. "lcl_server_file IMPLEMENTATION
* CLASS lcl_pc_file DEFINITION
CLASS lcl_pc_file DEFINITION
INHERITING FROM lcl_file.
PUBLIC SECTION.
METHODS:
get_contents REDEFINITION.
PROTECTED SECTION.
METHODS:
choose REDEFINITION.
ENDCLASS. "lcl_pc_file DEFINITIO
* CLASS lcl_pc_file IMPLEMENTATION
CLASS lcl_pc_file IMPLEMENTATION.
METHOD choose.
DATA:
l_i_path TYPE dxfields-longpath VALUE 'C:\',
l_o_path TYPE dxfields-longpath.
CALL FUNCTION 'F4_DXFILENAME_TOPRECURSION'
EXPORTING
i_location_flag = 'P' " PC
i_path = l_i_path
fileoperation = 'R' " Lectura
IMPORTING
o_path = l_o_path
EXCEPTIONS
rfc_error = 1
OTHERS = 2.
IF sy-subrc = 0 AND l_o_path <> l_i_path.
MOVE l_o_path TO _v_path.
ELSE.
RAISE no_path_chosen.
ENDIF.
ENDMETHOD. "choose
METHOD get_contents.
CHECK NOT _v_path IS INITIAL.
CALL METHOD cl_gui_frontend_services=>gui_upload
EXPORTING
filename = _v_path
CHANGING
data_tab = rt_contents
EXCEPTIONS
file_open_error = 1
file_read_error = 2
no_batch = 3
gui_refuse_filetransfer = 4
invalid_type = 5
no_authority = 6
unknown_error = 7
bad_data_format = 8
header_not_allowed = 9
separator_not_allowed = 10
header_too_long = 11
unknown_dp_error = 12
access_denied = 13
dp_out_of_memory = 14
disk_full = 15
dp_timeout = 16
OTHERS = 17.
IF sy-subrc <> 0.
RAISE read_error.
ENDIF.
ENDMETHOD. "get_contents
ENDCLASS. "lcl_pc_file IMPLEMENTATION
* Data
DATA: gr_file TYPE REF TO lcl_file.
* Main Program
START-OF-SELECTION.
* Get text lines from file
IF p_srv = abap_true.
CREATE OBJECT gr_file
TYPE
lcl_server_file
EXCEPTIONS
no_path_chosen = 1.
ELSE.
CREATE OBJECT gr_file
TYPE
lcl_pc_file
EXCEPTIONS
no_path_chosen = 1.
ENDIF.
On a 4.6c system this code gave me a dump, while on my NW7.0 SP it doesn't even activate with the following error:
You cannot call abstract methods in the "CONSTRUCTOR" method.
- Following some suggestions from Java forums i've tried to define the constructor in the base class as PROTECTED or PRIVATE instead, then calling super->constructor from the subclasses, but I get this error in german:
Sichtbarkeit des Konstruktors darf nicht spezieller als die Sichtbarkeit der Instanzerzeugung (CREATE-Zuzatz) sein.
which Altavista translates like:
Visibility of the constructor may not be more special than the
visibility of the instance production (CREATE Zuzatz).
- I've also thought of defining the CHOOSE method as a class (not instance) one, then calling it before creating the file object which maybe solves the problem, but I see that approach more "procedural oriented" which i'm trying to avoid.
- Of course I could define a constructor for each subclass, but both would have exactly the same code.
I'm really lost on how should I code this. My main focus is on avoiding code dupplication.
I hope someone with more OO experience can see what I'm trying to do and sheds some light.
Many thanks for reading all this!Dear Alejandro,
When i saw your code, you are trying to access an astract method CHOOSE(which is actually implemented in sub class) from the constructor of the base class which is not possible. By this time, we don't know which sub class it is refering to, so it gives an error. I see two solutions for this..
1. To define constructor in sub class and call the choose method from the consturctor of the sub class(which in this case is reputation of the same again for each sub class)
2. Remove the calling of choose method from the constructor of the main class and call it separately(after creating the object). By now we know which sub class we are refering to. I would have designed the program in the following way.
* CLASS lcl_file DEFINITION
CLASS lcl_file DEFINITION ABSTRACT.
PUBLIC SECTION.
METHODS:
constructor
IMPORTING
i_path TYPE string OPTIONAL
EXCEPTIONS
no_path_chosen,
get_contents ABSTRACT
RETURNING
value(rt_contents) TYPE string_table
EXCEPTIONS
read_errorm,
set_path ABSTRACT
EXCEPTIONS
no_path_chosen.
PROTECTED SECTION.
DATA:
_v_path TYPE string.
* METHODS:
* choose ABSTRACT
* EXCEPTIONS
* no_path_chosen,
* set_path ABSTRACT
* IMPORTING
* i_path TYPE string.
ENDCLASS. "lcl_file DEFINITION
* CLASS lcl_file IMPLEMENTATION
CLASS lcl_file IMPLEMENTATION.
METHOD constructor.
IF i_path IS SUPPLIED.
_v_path = i_path.
* CALL METHOD set_path
* EXPORTING
* i_path = i_path.
* ELSE.
**---->>>> PROBLEM CALL - CAN'T BE DONE!!
* CALL METHOD choose
* EXCEPTIONS
* no_path_chosen = 1.
* IF sy-subrc = 1.
* RAISE no_path_chosen.
* ENDIF.
ENDIF.
ENDMETHOD. "constructor
* METHOD set_path.
* _v_path = i_path.
* ENDMETHOD. "set_path
ENDCLASS. "lcl_file IMPLEMENTATION
* CLASS lcl_server_file DEFINITION
CLASS lcl_server_file DEFINITION
INHERITING FROM lcl_file.
PUBLIC SECTION.
METHODS:
get_contents REDEFINITION,
set_path REDEFINITION.
* PROTECTED SECTION.
* METHODS:
* choose REDEFINITION.
ENDCLASS. "lcl_server_file DEFINITIO
* CLASS lcl_server_file IMPLEMENTATION
CLASS lcl_server_file IMPLEMENTATION.
METHOD set_path.
DATA:
l_i_path TYPE dxfields-longpath,
l_o_path TYPE dxfields-longpath.
CHECK _v_path IS INITIAL.
CALL FUNCTION 'F4_DXFILENAME_TOPRECURSION'
EXPORTING
i_location_flag = 'A' " Application server
i_path = l_i_path
fileoperation = 'R' " Lectura
IMPORTING
o_path = l_o_path
EXCEPTIONS
rfc_error = 1
OTHERS = 2.
IF sy-subrc = 0 AND l_o_path = l_i_path.
MOVE l_o_path TO _v_path.
ELSE.
RAISE no_path_chosen.
ENDIF.
ENDMETHOD. "set_path
METHOD get_contents.
DATA: l_line LIKE LINE OF rt_contents,
l_osmsg TYPE string.
CHECK NOT _v_path IS INITIAL.
* OPEN DATASET _v_path FOR INPUT
* IN TEXT MODE
* MESSAGE l_osmsg.
IF sy-subrc = 0.
* MESSAGE e000(oo) WITH l_osmsg
* RAISING read_error.
ELSE.
DO.
READ DATASET _v_path INTO l_line.
IF sy-subrc = 0.
APPEND l_line TO rt_contents.
ELSE.
EXIT.
ENDIF.
ENDDO.
CLOSE DATASET _v_path.
ENDIF.
ENDMETHOD. "get_contents
ENDCLASS. "lcl_server_file IMPLEMENTATION
* CLASS lcl_pc_file DEFINITION
CLASS lcl_pc_file DEFINITION
INHERITING FROM lcl_file.
PUBLIC SECTION.
METHODS:
get_contents REDEFINITION,
set_path REDEFINITION.
* PROTECTED SECTION.
* METHODS:
* choose REDEFINITION.
ENDCLASS. "lcl_pc_file DEFINITIO
* CLASS lcl_pc_file IMPLEMENTATION
CLASS lcl_pc_file IMPLEMENTATION.
METHOD set_path.
DATA:
l_i_path TYPE dxfields-longpath VALUE 'C:\',
l_o_path TYPE dxfields-longpath.
CHECK _v_path IS INITIAL.
CALL FUNCTION 'F4_DXFILENAME_TOPRECURSION'
EXPORTING
i_location_flag = 'P' " PC
i_path = l_i_path
fileoperation = 'R' " Lectura
IMPORTING
o_path = l_o_path
EXCEPTIONS
rfc_error = 1
OTHERS = 2.
IF sy-subrc = 0 AND l_o_path = l_i_path.
MOVE l_o_path TO _v_path.
ELSE.
RAISE no_path_chosen.
ENDIF.
ENDMETHOD. "set_path
METHOD get_contents.
CHECK NOT _v_path IS INITIAL.
CALL METHOD cl_gui_frontend_services=>gui_upload
EXPORTING
filename = _v_path
CHANGING
data_tab = rt_contents
EXCEPTIONS
file_open_error = 1
file_read_error = 2
no_batch = 3
gui_refuse_filetransfer = 4
invalid_type = 5
no_authority = 6
unknown_error = 7
bad_data_format = 8
header_not_allowed = 9
separator_not_allowed = 10
header_too_long = 11
unknown_dp_error = 12
access_denied = 13
dp_out_of_memory = 14
disk_full = 15
dp_timeout = 16
OTHERS = 17.
IF sy-subrc = 0.
* RAISE read_error.
ENDIF.
ENDMETHOD. "get_contents
ENDCLASS. "lcl_pc_file IMPLEMENTATION
* Data
DATA: gr_file TYPE REF TO lcl_file.
* Main Program
START-OF-SELECTION.
* Get text lines from file
IF abap_true = abap_true.
CREATE OBJECT gr_file
TYPE
lcl_server_file
EXCEPTIONS
no_path_chosen = 1.
ELSE.
CREATE OBJECT gr_file
TYPE
lcl_pc_file
EXCEPTIONS
no_path_chosen = 1.
ENDIF.
gr_file->set_path( ).
Regards
Kesava
Edited by: Kesava Chandra Rao on Mar 19, 2008 11:44 AM -
Hi, in an
abstract class Report
private int mat
private string add
private int mat
private double creduced = 0.125;
private double sreduced = 0.25;
public Property(String location, int material)
add = location;
mat = material;
public double getActualPrice()
double base = getPrice();
double money = base;
if (mat == 1)
money -= base * creduced;
return money;
etc and two abstract classes called getPrice() , and getInsurance()- which i have both coded in the extended class
in a class called "class Info extends Report" I want to use the getActualPrice() method since it will anyway cause of inheritence but i want to add a new if line to it. How do I do this and code it in the extended class?
Can i super call the instance variables and local variables ? I have tried super calls on the instance variables but since none of them are included in any of the constructors it wont work.public double getActualPrice()
double actual=super.getActuelPrice();
if ( something )
actual=dosomethingwith(actual){
return actual;
} -
How to call a custom controller method from view
Hi,
I ve created a simple web service and consumed it in a model. Mapped the input & output parameters to custom controller context which in turn mapped to component controller's context which in turn to view's contexts.
How to call a custom controller method from view?
Please explain the syntax.
Regards,
Manoj.Hi Patralekha,
Give some idea for the below scenario:
I ve created a simple web service and consumed it in a model. What I did was
1) for the input parameters, mapped the node from view->custom controller->model
2)for the output parameter, mapping from model->custom controller->view.
It works fine.
But I don't want to access model nodes directly, rather I want to set the input param in somewhere else (like custom controller) before calling the appropriate method, same for the response also.
Share me your thoughts.
Regards,
Manoj.
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