Caller info as in Perl

[soup_or_power]

Hi Experts
In Perl it is possible to determine the caller. Is there an equivalent
function in Java? Approximately, this is what I want to do

class A {

function f () {
if (caller is B) do B stuff;
if (caller is C) do C stuff;
}
class B extends A{}
class C extends A{}



Thanks for your help.

 

[Hendrik Maryns]

(e-mail address removed) schreef:

Hi Experts
In Perl it is possible to determine the caller. Is there an equivalent
function in Java? Approximately, this is what I want to do

class A {

function f () {
if (caller is B) do B stuff;
if (caller is C) do C stuff;
}
class B extends A{}
class C extends A{}

You obviously didn´t get the idea of polymorphism.

abstract class A {
function f ();
}

class B extends A{
function f (){
do B stuff;
}
}

class C extends A{
function f (){
do C stuff;
}
}

H.
--
Hendrik Maryns

==================
www.lieverleven.be
http://aouw.org

 

[Robert Klemme]

Hi Experts
In Perl it is possible to determine the caller. Is there an equivalent
function in Java? Approximately, this is what I want to do

class A {

function f () {
if (caller is B) do B stuff;
if (caller is C) do C stuff;
}
class B extends A{}
class C extends A{}



Thanks for your help.

There are several solutions depending on what you need:
http://groups.google.com/group/comp.lang.java.programmer/browse_thread/thread/34d8c5be4024e398


Kind regards

robert

 

[Chris Smith]

In Perl it is possible to determine the caller. Is there an equivalent
function in Java? Approximately, this is what I want to do

class A {

function f () {
if (caller is B) do B stuff;
if (caller is C) do C stuff;
}
class B extends A{}
class C extends A{}

First of all, the need to do this is symptomatic of extremely serious
design problems. You should think hard before relying on something like
this.

That said, yes you can do it:

StackTraceElement[] stackTrace = new Throwable().getStackTrace();
assert stackTrace.length >= 2 : "Can't determine calling context";

String callerClassName = stackTrace[1].getClassName();
if (callerClassName.equals("my.package.B")) ...;

--
www.designacourse.com
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Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation