Check allocation object casting

Hi
Is there some function to check an object data for possible cast.
Ive this sheet code for exemple
Object obj1;
Object obj2;
Object obj3;
JTree tree;
JMenu menu;
// Normaly it's not possible to cast fromm menu to tree
obj1 = (Object)tree;
obj2 = (Object)menu;
Now i would like to check the real instance of the object
ex :
if obj1 is an instance of JTree
do something
else obj1 is an instance of JMenu
do something else.
The only solution to do this i've founded is use java.lang.ClassCastException
Thanx for help

Jeez, you were that close:
if(obj instanceof JTree)
// something
else if(obj instanceof JMenu)
// something else
}Enjoy,
Radish21

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GATP allocation object

Hi all
In the step "Check the Product Allocation Settings" I get following error message
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The characteristic combinations are generated for the PLOB. The value of the DP characteristic corresponding to KONOB as well as the Product allocation object in customizing is not numeric but alpha and 9 characters. I have thoroughly checked this value to be to be identical.
I suspect the mismatch is occuring because of the way the value is stored in planning area and ATP tables. The characteristic length itself is 18. Any experience or insights on this issue?
Thanks in advance

I take back the statement of though check, found the error, closing the issue.

Problem to check out object in siebel 8.1, using Windows Vista

Hi people,
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Can we check the Objects modifiable " option for standard objects

Dear Friends
In IR , we have imported SRM SERVER->SRM SERVER5.5
Then we have checked the option "Objects are modifiable" then we imported the IDOC from R/3 system under SRM SERVER 5.5 swcv.
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Hi Jai,
 >>>Can we check the "Objects are modifiable" for standard compoents delivered by SAP????
No. As best practise you are not supposed to do so.
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Object Casting

hi ,i have a question for .Base on this example below , i need to understand some casting basic .I understand how premitives values widening rules works but not on object casting rules.
Question 1.
Okay ,base on the example below why 'c=(Test) a' will always give compile error while "a=b" does not .Let takes this example , b already extends A and should have information of A class while A only have it own .I know i was thinking another way round.Can any one help.
Question 2.
How to make " c = (Test) a to run without any problem ,as long as a is assign to a is ok.
Question 3.
I have a statement from Khalid book page 202 and i don't understand .
First statement:=Conversion which preserve the inheritance is a relationship are allowed ,other conversion require an explicit case or are illegal.
Fecond statement:=There is no notion of promotion for reference values.
Question 4.
What is the benefit of using casting and when we need to use it .Can give a short example.??
class A {int Athing = 1;}
class B extends A {int Bthing = 2;}
class Test extends A
{ int Cthing = 3;
public static void main(String args[])
A a = new A();
B b = new B();
Test c = new Test();
//c = (Test) a; //runtime error
a = b;

Ron, does your mommy know you're here? Shoudn't you be out riding your bike or doing homework or watching X Men or something instead of interrupting the grown-ups?
Wikey: The answer to your question is that you can always (and implicitly) cast to a subclass because the subclass is always a member of the class, but you can't always even explicitly cast to the parent or higher class. To give a concrete example, all Toyota Camries are cars, but not all cars are Toyota Camries. There are things you can do with a Toyota Camry that you can't do with all cars. In your code, if you had coded A a = new Test();, you woudn't have a runtime error.
Doug

BAPI for Allocating Object to Class

Hi all Experts,
Pls help in how to use the following BAPIs.
BAPI_OBJCL_CREATE_KEY
BAPI_OBJCL_CHANGE_KEY
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Regards
Nagarajan M

Hello,
have a look at the following thread. There're some function modules that should fit to your requirements:
BAPI for CL24N
Best regards
Stephan

Need precision on dynamically allocated objects

Hi all,
For example, I declare this class :
package Global
public class GV
public static var gLogin:String="123";
public static var gPassword:String="4567";
public function test(t:int):int {
return t+1;
Flex lets me use my class this way to access a static member
import Global.*;
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In this case, a GV object is dynamically allocated and the
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Now I want to call the test method using the same dyn alloc :
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GV.test(123);
Flex gives me a "Unknown method" error.
So this is my question : Why can I access a static member but
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MiF

Shame on me !
I did not know that a function could be static.
Thank you for your help Simon.

Hi i just to want to know when we use object casting..

sorry about this newbie question i ve already asked to my tutor but
didn't get it...
i just wonder what will happen if we cast object..
i just can't imagin..coz im just bit slow on creative thinking...
my currently writing code is like this..
Integer nextCustID = new Integer("123456");
Customer customer = new Customer(nextCustID, "Fred");
customers.put("First", customer);
customer = (Customer) customers.get("First");
System.out.println(customer);i don't know about object casting...............................

You don't cast objects. You just cast references - widening or narrowing their "scope" along the inheritance hierarchy.
String s = new String("Hello");
Object o = (Object) s; // Explicit cast not necessary, just for clarification
String s = (String) o;While "hello" might appear as a String, then as an Object, then again as a String, it is always a String. Only the reference type to it changes.

Check maintainance object or function group in sm30

hi,
my abaper create a table maintainnce view and function group . it working fine in developement system but when i transport it to quality system and then open table view in sm30 it s showing error check maintainance object or function group.
please provide me the soloution.

Hi,
Was the import successful into the QA system? Check the import logs and RC to see if there were any errors/warning reported.
Also, run the syntax check for the functional module in QA to get more information about the error.
You might have to involve the ABAP consultant to get this resolved.
Regards,
Varun

Finding existing allocated object ID numbers in OID & OVD

Is there any way to find the object IDs that are already used in OID and OVD?
I need to create some new attributes - so I'll need to assign new object IDs to these attributes - and I want these to continue on from IDs that have previously been assigned (and obviously, be different numbers).
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Thanks

Actually, the fact that it's a string works for me here,
since my custom formatter expects a string.
That's the one last thing I'm confused about. Following the
example I got from a book, I made my formatter. And it was the
place I got the "myNumber" thing. So how would I modify my
FractionFormatter.as to eliminated the need to pass the string from
the main file (if I understand correctly):
package myComponents
//Import base Formatter class
import mx.formatters.Formatter
public class FractionFormatter extends Formatter {
// Declare the variable to hold the pattern string.
public var myNumber:String;
// Constructor
public function FractionFormatter() {
// Call base class constructor.
super();
// Override format().
override public function format(value:Object):String {
//Validate value - it must be a nonzero length string.
if(value.length == 0) {
// Return empty string and error message for zero-length
string.
error="Zero Length String";
return ""
//If the value is valid, format the string.
switch (myNumber) {
case ".25" :
return "1/4";
break;
case ".5":
return "1/2";
break;
case ".75":
return "3/4";
break;
case "1":
return "1";
break;
case "1.25":
return "1 1/4";
break;
default :
// If formatString is not "upper" or "lower",
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error="Invalid Format String";
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Regarding checking the objects versions after transporting

Hi
we are doing transportation from DEV to QAS. what we have done is
we have collected all master data objects,data sorses,transformations,dtps,process chains into different transport recquests and releases the recquests ,and imported recq in QAS.
now our recq is to check whether all master data objects,data sorses,transformations,dtps,process chains are transported or not
if transported have to check all obj are in active version or not.
at present we are follwing below procedure
a) go to se09 in DEV and select 1 recq and check the objects list under that recq then copy one obj and check in QAS,the same procedure for all objects, but we are having 100 recquests, under each recq we are having many objects.
if we follow that it wil take days,so is there any procedure to check
are there any tables where we can check fast and minimise the time.

am not sure about the object status however can get list of objects in your transports from below process :
Go to table E071 and give your request numbers as input. It will give you list of all the objects contained in those requests.
Now object will be of different types , IOBJ - Infoobjects , ODSO - ODS , MPRO - Multiprovider , TRFN - Transformation etc.

How can I check an object is an instance of any type within an array of related types?

In LabVIEW, it's possible to check the runtime type of an object using To More Specific Class.vi. One usage of this would be to perform a safety check if some kind of class uses instances of another kind of class but is only able to handle a subset of that class' child types.
For instance, let's say you had Beverage.lvclass, which represents an abstract type of product, and several subclasses: Coffee.lvclass, Tea.lvclass and Soda.lvclass.
We also have a Person.lvclass which can drink beverages. A person also has preferences about the drinks they do or do not like:
Attached is an implementation of this in LabVIEW.
In Person.lvclass : Drink.vi, I have the following code. For whatever reason the wire appears broken in these snippets but it's all fine in the actual code.
In Scenario.vi, I have the following code:
What I'm finding is that no error is generated and instead I get "Yum, I love tea!", "Yum, I love coffee!" and "Yum, I love soda!". My guess is that To More Specific Class.vi casts to the static type of the "target class" input wire rather than its runtime type - and because I'm passing in elements from an array of types, the wire's static type is upcasted to the most specific type that is a superclass of the types in the array - which would be Beverage.lvclass. And so the cast is trying to determine if an object of static type Beverage.lvclass is an instance of Beverage.lvclass, which will of course be the case all the time.
Is there any way to make LabVIEW check against the most specific runtype type of an object? As in, is there something I could do that, in this example case, would allow me to get the required behaviour of Joe throwing an error when he's made to drink soda? Or is this another limitation of LabVIEW that I'm going to have to live with?
Solved!
Go to Solution.
Attachments:
TypeCastingExample.zip ‏64 KB

tst wrote:
Your guess seems reasonable. I can't check right now, but there's a primitive called preserve run time type, which should do what you want.
Cheers, that seems to have got it! I've never really looked at Preserve Run-Time Class before, but it seems to do the right thing.

Object casting: confusion in ABAP Objects: Complete Reference book

Hi,
During Object Assignments using casting, is a Type Test carried out during the syntax check or at runtime?
A.5.2.2 (page 1008) of 'ABAP Objects: The Complete Reference' says about Widening Cast: "...you must check at runtime...". However on the next page under A.5.3.2 it says of Widening Cast in Data References: "The syntax check precludes...".
A.5.4 (page 1010) concerns Assignments between Object Reference Variables, but makes no mention of whether checks are carried out by a syntax check or at runtime.
Also nowhere does it mention when Type Tests for Narrow casting takes place. Can anyone clear my confusion please? Unfortunatly I don't know enough about this stuff to test by writing some code.
Thanks.

William,
Your questions can be answered by the following rule for object references, which I found in the book "ABAP Objects" by Horst Keller and Sascha Krüger:
"... that the static type of the target variable must be equal to or more general than the dynamic type of the source variable."
Here "static type" means the type with which an object reference variable is declared. "Dynamic type" is the type that the object reference variable has at runtime. The dynamic type of an object reference is always more special than its static type, otherwise a runtime error occurs.
With this rule all your questions can be answered:
1. The Narrowing Cast is always checked during the syntax check. Example:
DATA o_ref1 TYPE REF TO object.
DATA o_ref2 TYPE REF TO class_1.
o_ref1 = o_ref2.
Here the reference o_ref2 has a dynamic type "class_1" or a subclass of it, which is narrower than its static type "class_1", which is narrower than the static type "object" of the reference o_ref1. Therefore, the syntax check says that the assignment is OK.
2. The Widening Cast is always checked at runtime and requires an assignment using the operator ?=. If you use the operator = in the assignment, a syntax error occurs. Therefore the following example produces a syntax error (try it yourself):
DATA o_ref1 TYPE REF TO object.
DATA o_ref2 TYPE REF TO class_1.
o_ref2 = o_ref1.
The correction for this syntax error is:
DATA o_ref1 TYPE REF TO object.
DATA o_ref2 TYPE REF TO class_1.
o_ref2 ?= o_ref1.
Now the syntax check is satified, and the correctness of the widening cast is checked at runtime.
Kind regards,
Michael Kraemer
Message was edited by: Michael Kraemer

When should object casting be used?

Hi,
just wondering something. Saw there that returning objects from methods and downcasting the returned object is bad. When should casting be used? I currently have a program that has an object that contains a HashMap as a field. When I try retrieve objects from the HashMap using the relevant key, I have to cast them to what they were originally! Is this bad programming practice or is it the only way to do things?
Thanks.
// example of retrieving object from key
dbDirectory = (String)dbInfo.get("dbDirectory");

LeWalrus wrote:
Hi,
just wondering something. Saw there that returning objects from methods and downcasting the returned object is bad. When should casting be used? I currently have a program that has an object that contains a HashMap as a field. When I try retrieve objects from the HashMap using the relevant key, I have to cast them to what they were originally! Is this bad programming practice or is it the only way to do things?
Thanks.
// example of retrieving object from key
dbDirectory = (String)dbInfo.get("dbDirectory");
Before generics, this was a perfectly acceptable practice. Generally speaking, you use type-casting when the compiler is unable to ensure the type validity at compile-time, but you know it is correct, so you supply the extra information to the compiler so it knows everything is correct. Sometimes you need to circumvent the strong type-checking part of the language for flexibility, but this is something that should be used very sparingly.
Now it would be better to use generics so that the compiler will know at compile time that the values in your map are Strings, instead of just Objects.

Object Casting confusion

Hello,
I have two classes used in the insurance business. One is a Member, which is someone covered by insurance (eg. an Employee, Spouse, Dependent) and one is a Employee which is more specificly the person who actually has the insurance.
I am reading records of a database and creating each record into a Member Object. My Employee object extends Member. I want to know put the business logic in my main method to determine which Members is an Employee, Dependent, or Spouse.
I am explicitly casting down the hierarchy, which I thought was allowable. I even implemented Cloneable on the Member object to try to get it work. The compiler seems to be fine with it, but I keep getting a runtime error: "ClassCastException".
I am trying to avoid extracting the information from Member and having to reassemble it into Employee by using inheritance. What am I missing?
Thanks.
public class Member implements Cloneable
     private Object ssn;
     private Object planNumber;
     private Object locationCode;
     private Object coverageType;
     private Object benefit;
     private Object hireDate;
     private Object retireDate;
     private Object lastName;
     private Object firstName;
     private Object middleInitial;
     private Object address;
     private Object city;
     private Object state;
     private Object zip;
     private Object dob;
     private Object doh;
     private Object relationship;
     private Object gender;
     private Object effectiveDate;
     private Object status;
     private Object order; //represents order in spreadsheet
     //setters
     public void setOrder(Object order) {this.order = order;}
     public void setSSN(Object ssn){this.ssn = ssn;}
     public void setPlanNumber(Object planNumber){this.planNumber =planNumber;}
     public void setLocationCode(Object locationCode){this.locationCode = locationCode;}
     public void setCoverageType(Object coverageType){this.coverageType=coverageType;}
     public void setBenefit(Object benefit){this.benefit=benefit;}
     public void setHireDate(Object hireDate){this.hireDate=hireDate;}
     public void setRetireDate(Object retireDate){this.retireDate = retireDate;}
     public void setLastName(Object lastName){this.lastName= lastName;}
     public void setFirstName(Object firstName){this.firstName=firstName;}
     public void setMiddleInitial (Object middleInitial){this.middleInitial=middleInitial;}
     public void setAddress(Object address){this.address = address;}
     public void setCity(Object city){this.city = city;}
     public void setState(Object state){this.state = state;}
     public void setZip(Object zip){this.zip=zip;}
     public void setDOB(Object dob){this.dob=dob;}
     public void setDOH(Object doh){this.doh=doh;}
     public void setGender(Object gender){this.gender=gender;}
     public void setEffectiveDate(Object effectiveDate){this.effectiveDate=effectiveDate;}
     public void setStatus(Object status){this.status=status;}
     public void setRelationship(Object relationship){this.relationship = relationship;}
     //getters
     public Object getSSN(){return this.ssn;}
     public Object getPlanNumber(){return this.planNumber;}
     public Object getLocationCode(){return this.locationCode;}
     public Object getCoverageType(){return this.coverageType;}
     public Object getBenefit(){return this.benefit;}
     public Object getHireDate(){return this.hireDate;}
     public Object getRetireDate(){return this.retireDate;}
     public Object getLastName(){return this.lastName;}
     public Object getFirstName(){return this.firstName;}
     public Object getMiddleInitial(){return this.middleInitial;}
     public Object getAddress(){return this.address;}
     public Object getCity(){return this.city;}
     public Object getState(){return this.state;}
     public Object getZip(){return this.zip;}
     public Object getDOB(){return this.dob;}
     public Object getDOH(){return this.doh;}
     public Object getGender(){return this.gender;}
     public Object getEffectiveDate(){return this.effectiveDate;}
     public Object getStatus(){return this.status;}
     public Object getOrder() {return order;}
     public Object getRelationship(){return relationship;}
}//end class
import java.util.*;
public class Employee extends Member
     Employee()
     private Spouse spouse;
     private Dependent dependent;
     private ArrayList dependents;
     private static int numberOfDependents;
     public void setSpouse(Spouse spouse){this.spouse = spouse;}
     public Spouse getSpouse(){return this.spouse;}
     public Dependent getDependent(int n)
          dependent = (Dependent)dependents.get(n);
          return dependent;
     public void setDependent(Dependent dependent)
          ++numberOfDependents;
          this.dependent = dependent;
          this.dependents.add(dependent);
     public ArrayList getDependents()
          return dependents;
     public void setDependents(ArrayList dependents)
          this.dependents = dependents;
     public int getNumberOfDependents()
          return numberOfDependents;
}//end class
import java.util.*;
//Employee objects can be selfstanding Employee(String SSN)
//The Spouse and Dependent objects - e.g. Spouse(String SSN, e)
public class InsuranceObjectDriver
//     ****************** START MAIN **********************************
     public static void main(String[] args)
          //Open connection and query table
          DatabaseObjects db = new DatabaseObjects("LIBRARY", "", "");
          db.queryDb("Table1");
          ArrayList memberList = db.getAllRecords();
          Member member;
               member = (Member)memberList.get(0);
               if (member.getRelationship().equals("E"))
                    Employee e =(Employee) member;
               }

>
I see nothing wrong with the casting, since Employee
is a Member.
My only assumption is that the actual instance of
"member" is not an Employee...so check your
getRelationship().equals("E") condition...it may give
you true, where it should have been false.This is why I'm casting it explicity to a Employee
For design-wise, I see Employee, Spouse, and
Dependent are more of a Member role..and not a
"Member" superclass. I don't understand what you are trying to tell me here. Member is the superclass. Employee, Spouse, and Dependent are subclasses of the Member, which is one of the problems. I have to explicity cast down the hierarchy.
Plus, what's with all the
"Object" in the Member class? I never seen anyone
did this before.
I understand that by defining the Member attributes
as Object, you can
set the underlying type to anything in the
future...without having to change the code...but i
think this is a bad idea (just my thought).I like it. It dummy proofs things a bit. The input files are often sloppy and bad, plus I really don't care to maipulate most of these fields, I just need to make sure they populate the objects.
E.g. I build a quick and dirty application for non-techies, who don't pay attention to data types much (in my many experiences). I don't want the program to bomb out on Date of Hire (doh) because it was brought in through the JDBC connection as an Object and not a Date.
Data is brought into the application from the resultset via a getObject(n) call. Why change it? I guess I could use wrapper classes for them but I can't see why right now, but will consider this when I figure out the casting issue.

Check allocation object casting

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