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Declass.java

import de.fub.bytecode.*;
import de.fub.bytecode.classfile.*;

public class Declass {
  private static boolean code = false;
  private static String method = null;

  private static class Printer extends EmptyVisitor {
    public void visitMethod(Method m) {
      if(method != null && !method.equals(m.getName() + m.getSignature()))
    return;

      if(m.isNative()) System.out.print("native ");
      System.out.println(m.getName() + m.getSignature());
      if(code) {
    Code c = m.getCode();
    if(c != null)
      System.out.println(Utility.codeToString(c.getCode(), c.getConstantPool(), 0, -1, false));
    System.out.println();
      }
    }
  }
  
  public static void DeclassFile(String name) {
    try {
      JavaClass jc;

      if((jc = Repository.lookupClass(name)) == null)
        jc = new ClassParser(name).parse();

      new DefaultVisitor(jc, new Printer()).visit();
    } catch(java.io.IOException e) {
      e.printStackTrace();
      System.exit(1);
    }
  }  
  public static void main(String[] args) {
    int argc = args.length;

    if(argc == 0) {
      System.err.println("usage:");
      System.err.println("\tjava Declass [-code|-nocode] [-method <name>] <classname> {<classname> ...}");
      System.err.println();
      return;
    }

    for(int i = 0; i < argc; i++)
      if(args[i].startsWith("-")) {
    if(args[i].equals("-code"))
      code = true;
    else if(args[i].equals("-no-code"))
      code = false;
    else if(args[i].equals("-method"))
      method = args[++i];
    else {
      System.err.println("invalid option -- " + args[i]);
      System.exit(1);
    }
      } else
    DeclassFile(args[i]);
  }  
}

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