package net.sf.cglib.transform.hook;
   
   import net.sf.cglib.core.*;
   import net.sf.cglib.transform.*;
   import org.objectweb.asm.Attribute;
   import org.objectweb.asm.Type;
   
   public class ExamplePreProcessor extends AbstractPreProcessor {
       private static final Type PRINT_STREAM =
        TypeUtils.parseType("java.io.PrintStream");
      private static final Signature PRINTLN =
        TypeUtils.parseSignature("void println(String)");
      
      protected ClassTransformer getClassTransformer(String name) {
          return new ClassEmitterTransformer() {
              public CodeEmitter begin_method(int access, Signature sig, Type[] exceptions, Attribute attrs) {
                  CodeEmitter e = super.begin_method(access, sig, exceptions, attrs);
                  if (!TypeUtils.isAbstract(access)) {
                      e.getstatic(Constants.TYPE_SYSTEM, "err", PRINT_STREAM);
                      e.push("Running " + sig.getName() + sig.getDescriptor());
                      e.invoke_virtual(PRINT_STREAM, PRINTLN);
                  }
                  return e;
              }
          };
      }
  }