Calling protected constructor from class extension

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Posted on by Community Member

Hi,
I created an extension class according to all rules, but I get a bunch of errors, saying that the parent class (HcmWorkerTransition) is not visible due to protection level (by default it is declared as just a class, so I suppose it is public). The same is said about the parent class methods, although they are declared as protected. What could possibly cause it? Thank you.

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Martin Dráb 237,801 Most Valuable Professional on at

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It's not easy to comment on your code if you don't show it. You said you've build an extension class, but then you switch top a problem about inheritance, which isn't related to extension classes.

Or, if you're trying to inherit your extension class from HcmWorkerTransition, you're doing something wrong. Use either inheritance or extensions.

Please tell us what you did, why and what exact errors you've got there.

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Basheer17 2,720 on at

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If no access modifier is mentioned, by default its protected. If you want to access protected members you'll have to go for extension(Using inheritance). To avoid overlayering combination of Derived class(Inheritance) and _Extension class will be sufficient in most cases.

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I want to create an extension class and as I understand that class inherits from HcmWorkerTransition. I need to create an additional method in that extension class, that uses some method from HcmWorkerTransition.

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Basheer17 2,720 on at

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You can write your new method in the _extension class. Keep first parameter as your base class, and whenever your new method is called pass the base class object. In this way you can access other methods of your base class in your extension method using object reference.

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Martin Dráb 237,801 Most Valuable Professional on at

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May I ask you again to show us your actual code? We can't just guess what you've written.

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sure :

[ExtensionOf(classStr(HcmWorkerTransition))]

final class ASCHcmWorkerTransition_Extension

{

HcmWorkerTransition hcmWorkerTransition = new HcmWorkerTransition(); // I cant access the class constructor

}

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Martin Dráb 237,801 Most Valuable Professional on at

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Basheeruddin, you seem to be talking about extension methods, not class extensions. Class extensions requires an additional attribute (ExtensionOf), but then you don't have to hande the object reference by yourself as the first parameter (and it has several extra features).

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not to get you confused but this is the real piece of code:

[ExtensionOf(classStr(HcmWorkerTransition))]

final class ASCHcmWorkerTransition_Extension

{

ASCWorkerCategoryEnum hcmWorkerCategory;

static HcmWorkerRecId ascNewCreateHcmWorker(

ASCWorkerCategoryEnum _hcmWorkerCategory,

DirPersonName _dirPersonName,

HcmPersonnelNumberId _personnelNumber,

CompanyInfoRecId _legalEntityRecId = CompanyInfo::find().RecId,

HcmEmploymentType _hcmEmploymentType = HcmEmploymentType::Employee,

validFromDateTime _validFrom = DateTimeUtil::minValue(),

validToDateTime _validTo = DateTimeUtil::maxValue()

, EmployeeId_RU _employeeId = ''

)

{

HcmWorkerTransition hcmWorkerTransition = new HcmWorkerTransition();

hcmWorkerTransition.parmLegalEntityRecId(_legalEntityRecId);

hcmWorkerTransition.parmHcmEmploymentType(_hcmEmploymentType);

HcmWorkerTransition.ascParmHcmWorkerCategory(_hcmWorkerCategory);

hcmWorkerTransition.parmValidFrom(_validFrom);

hcmWorkerTransition.parmValidTo(_validTo);

}

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Martin Dráb 237,801 Most Valuable Professional on at

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That's the correct behavior - you can't access protected constructors from classes outside the inheritance hierarchy. Extension classes are completely separate classes and therefore they can't access protected members.

Why would you create a new instance anyway? Don't you rather want to refer to the instance you're extending? If so, simply use the variable called this.

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Basheer17 2,720 on at

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If your new method is static you have to pass the first parameter as base class object. Since "this" keyword can't be used in static methods.

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