Re: ASM for Reflection

  You can look at AspectWerkz's ClassInfo implementation

  regards,
  Eugene

On Sun, Jul 10, 2011 at 3:35 PM, theUser BL <[email protected]> wrote:
>
> Hi!
>
> Is it possibly after all that ASM can be used for Reflection without Java Reflection?
>
> I have already written it on the BCEL Mailinglist:
> http://www.mail-archive.com/[email protected]/msg06723.html
> http://www.mail-archive.com/[email protected]/msg06725.html
>
> I want to see Methods and Fileds of an Class. But it can possible, that the cass isn't in my classpath. Or that I want to use for compilation a different version then that, what the compiler itself use.
> Is that with ASM possible?
>
> For showing Methods with ASM I have currently found this one in the web:
> http://osdir.com/ml/java.objectweb.asm/2008-04/msg00048.html
>
> I have changed it a little bit to this one:
>
> import org.objectweb.asm.*;
> import org.objectweb.asm.tree.*;
> import java.util.*;
> import java.io.*;
>
> public class ShowIt {
>
>   public static void main(String[] args) {
>     try {
>       ClassNode cn = new ClassNode();
>       ClassReader cr = new ClassReader("java.util.HashMap");
>       cr.accept(cn, 0);
>       System.out.println(cn.access);
>       System.out.println(cn.name);
>       System.out.println(cn.outerClass);
>       System.out.println(cn.outerMethod);
>       System.out.println(cn.outerMethodDesc);
>       System.out.println(cn.signature);
>       System.out.println(cn.sourceDebug);
>       System.out.println(cn.sourceFile);
>       System.out.println(cn.superName);
>       System.out.println(cn.version);
>
>       System.out.println("--------------");
>
>       for (Iterator i = cn.methods.iterator(); i.hasNext(); ) {
>         MethodNode mn = (MethodNode) i.next();
>         System.out.println(mn.name + "  -  " + mn.desc);
>       }
>     } catch (IOException e) {
>       System.out.println(e);
>     }
>   }
>
> }
>
>
> The output is very different to that of Javap. So I have to write myself methods, which gives back how many arguments a reflected method have and so on.
> But if I doing it, then the compiler will be slower, too, and the performance advantage of ASM to BCEL isn't no longer so great.
>
> And as I mentioned, I am not sure, if it then do not using Java Reflaction as base.
>
> Greatings
> theuserbl
>
>
>
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