I was sitting in the middle of a boring presentation, and I saw this post and thought "Hey, I'm pretty bored at the moment, I'll write an auto-dispatcher for him!". Of course, by the I finished it, samtregar had already responded with the correct solution. :)

But, I'm going to post my solution anyways (even though it definitely isn't the optimal solution here), just because you might find it interesting. Also note that I do not have java/perl access on the lab computers that we are using, so this code is most definitely untested.

package Inline::Java::Classfile;

sub new {

    my ($type, $args) = @_;

    Inline->bind(Java => << "__CODE__");

// package org.perl.cpan.inline.java;

import java.lang.*;
import java.lang.reflect.*;

class InlineJavaDispatcher {
    protected $type inst;

    public InlineJavaDispatcher(Object[] args)
               throws InstantiationException
                     ,IllegalAccessException
                     ,IllegalArgumentException
                     ,InvocationTargetException
                     ,SecurityException
    {
        Class clazz = $type.class;
        Constructor[] cntrs = clazz.getDeclaredConstructors();
        for (int i=0; i < cntrs.length(); i++) {
            try {
                inst = cntrs[i].newInstance(args);
                return;
            }
            catch (IllegalArgumentException e) {
                
            }
        }

        throw new IllegalArgumentException(
            methodName + " was not found for the arguments supplied fo
+r Class $type."
        );
    }

    public Object dispatch(String   methodName
                          ,Object[] args)
                    throws IllegalAccessException
                          ,IllegalArgumentException
                          ,InvocationTargetException
                          ,NullPointerException
                          ,ExceptionInInitializerError
    {
        Class clazz = inst.getClass();
        Method am[] = inst.getDeclaredMethods();

        for (int i=0; i < am.length; i++) {
            if (am[i].getName().equals(methodName)) {
                try {
            return am[i].invoke(inst, args);
                }
                catch (IllegalArgumentException e) {
                    
                }
            }
        }

        throw new IllegalArgumentException(
            methodName + " was not found for the arguments supplied fo
+r Class $type."
        );
    }

}
__CODE__

    return InlineJavaDispatcher->new($args);
}

sub AUTOLOAD {
    my ($self,$args) = shift;
    my $type = ref($self) or croak "$self is not an object";

    my $name = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    $self->dispatch($name, $args);
}
[download]

Usage would be:

    my $obj = Inline::Java::Classfile->new("SomeClass", [$cntr_arg1, $
+arg2, $etc]);
    print $obj->hashcode(); # or whatever method
[download]

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