Automatically locate all classes; filter by regexp

[blahblahblahh]

This was originally written by duncanidaho, and then I started using it almost a year ago, and added various bugfixes and improvements along the way.

http://javagamesfactory.org/views/view-sourcesnippet?id=1

This is an "Automatic class locater and loader":

• Supply a regexp filter defining a classname (e.g. "com.sun.*") and ask it to find all classes anywhere on your classpath and in ANY jars that match that search
  
• Provide a list of regexps that you want it to completely ignore (for increased performance, for instance), e.g. "org.apache.*" if you're using some apache packages, and only want to find things in your packages
  
• Find all classes that implement a given interface (Yes! Really!)
  
• ...or do it using a regexp to filter out unwanted subclass names / improve search performance
  
• Produces a list of classes that were REQUIRED by some of the classes it found; tells you which classes required them (so you can decide if you care or not)
  
• Extensive error handling so that it recovers from practially every possible failure (um; only by trial-and-error - I may have missed some - let me know if you hit any new ones, or spot something that should be handled and currently isn't)
  
• ...probably does some other stuff too that I've forgotten about
  

FYI it's been running on every restart on the JGF server (auto-locates classes to be loaded to run parts of the system) for the last 6 months or so, and I'm pretty confident it's robust now (although I found many fiddly little bugs and problems along the way).

[Riven]

ClassPath.java was viewable, but I think I crashed your server while clicking the ClassLocator.java link.

The server-response was an image (MagicWoods thumbnail) instead of the java-code... and after that the server stopped responding.

I've had wrong images before: game-thumbnails in the LWJGL/JOGL comparision where you would expect the green/yellow round buttons.

Hope this helps..!  

[kevglass]

Incidently, I found attempting to log in to JGF crashed with an error report, which didn't tell me where to mail it.

When I got back to the site I still could find an email address to mail the stack trace to?

Kev

Games published by our own members! Check 'em out!

[blahblahblahh]

Incidently, I found attempting to log in to JGF crashed with an error report, which didn't tell me where to mail it.

Something in the last patches on Sunday is deeply wrong - generated > 15gb of logfiles in 2 days, ran out of disk space . Trying to find out what's in there now, but 15Gb is not easy to examine .

When I got back to the site I still could find an email address to mail the stack trace to?

Thanks, I'll add that to the todo list. The stack-trace-display is hard-coded (for obvious reasons) so I need to actually dig into code, but it'll be no problem.

[Luke]

This sounds like exactly what I have been looking for.  Any chance of posting the code here or sending me a copy?

Luke

[blahblahblahh]

This sounds like exactly what I have been looking for.  Any chance of posting the code here or sending me a copy?

Main site link works fine now AFAICS.

[t_larkworthy]

Oh wow. thats a great utility

[CommanderKeith]

• Find all classes that implement a given interface (Yes! Really!)

That's exactly what I need, but the link to the code doesn't work.  Can it be repaired?

Keith

[blahblahblahh]

Seems to be working fine at the moment.

NB: if it ever stops working, try again after 6am GMT (server is resetting itself every morning at 6am to combat a memory leak that periodically locks it up )

[CommanderKeith]

Thanks, got it going.  Very useful,

Cheers,

Games published by our own members! Check 'em out!

[zero]

Find all classes that implement a given interface (Yes! Really!)

Maybe I'm doing s.th. wron, but it doesn't work for me. I tried the following:

1   2   3

Class[] list = new ClassLocater().getSubclassesOf(java.util.EventListener.class); for(Class c : list)   System.out.println(c);

butg there are no classes and interfaces listed from the java.awt.event package. 

[blahblahblahh]

Most people want to skip the thousands of java and sun classes, so the default constructor filters them out:

public ClassLocater()
  {
    addSkipPrefix( "org.apache.log4j." );
    addSkipPrefix( "com.sun." );
    addSkipPrefix( "java" );
  }

This is documented - if you look at the class constructor, it says:

/**
   * Automatically adds sun's classes, the java library classes, and the Apache
   * log4j classes (a lib used by ClassLocater!) to the skip list; it's very unlikely
   * that you're trying to locate any of these!
   */

So, if you just comment out the line that skips everything starting with "java" you should be fine.

[zero]

thanks for the answer bbb.
of course I read the doc above the construrctor and commented the lines out, but forgot to mention this 

1   2   3   4   5

public ClassLocater() {        // addSkipPrefix( "org.apache.log4j." );      //  addSkipPrefix( "com.sun." );      //  addSkipPrefix( "java" );    }

any ideas?

[blahblahblahh]

Output? Have you turned on the debug mode for the loggers? You could also try adding extra logging,especially in ClassPath (I never needed any for it, so I never added any detailed loggers, but that would be a useful thing).