Bugs item #2804755, was opened at 2009-06-11 12:34
Message generated for change (Tracker Item Submitted) made by elmuerte
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Category: Compiletime - Core
Group: SVN
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Michiel Hendriks (elmuerte)
Assigned to: Nobody/Anonymous (nobody)
Summary: Constructor messages not processed
Initial Comment:
Creating a new object could also be seen as a message being send. However,
there are various issues:
1) Selector value
What is the selector value of a constructor message? This can not be the name
of the class, because that requires knowing the name of the class when defining
the matching expression. So this needs a special construction.
filtermodule ObserveCtors
{
inputfilters
flt : LogFilter = ( selector == "..." ); // what should "..." be to select
constructors?
}
superimposition
{
selectors
cls = { C | isClassWithAnnotation(C, 'WatchMe');
filtermodules
cls <- ObserveCtors;
}
2) Receiver status
If the constructor message is intercepted before the constructor is called
(just like with all other message) then there is no receiver context. If the
message is processed after the constructor was called you can override the
object construction.
3) Constructor delegation
Is it possible to delegate a constructor call to a different target? This
target couldn't be a constructed Object.
filtermodule TypeReplace
{
inputfilters
sync : Dispatch = (target ~= java.util.StringBuffer && selector == "...")
{ target = java.util.StringBuilder; }
}
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