casting null support
--------------------
Key: JRUBY-3865
URL: http://jira.codehaus.org/browse/JRUBY-3865
Project: JRuby
Issue Type: New Feature
Components: Java Integration
Reporter: Scott Cytacki
When calling methods in java from jruby where the same method has multiple
signatures, it would be useful to have a way to pass a "typed" null object.
For example if I have 2 methods in java:
doSomething(Frame f, int i)
doSomething(Component c, int i)
and I want to make sure I call the second method but with a null component then
in java I do this:
obj.doSomething((Component)null, 0)
But in jruby I haven't found a convinient way to do this. My current solution
is to use reflection something like this:
method = obj.java_class.declared_method(:doSomething, Component, int)
method.invoke( obj, Java.primitive_to_java(nil), 0 )
If instead there was something like a null method on wrapped java classes this
would be much nicer:
obj.doSomething(Component.null, 0)
The null method could return an special object that the jruby Java method
finding code could use to find the correct method in java.
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