modifiers.java :  » Scripting » Pnuts » org » pnuts » lib » Java Open Source

/*
 * @(#)modifiers.java 1.2 04/12/06
 *
 * Copyright (c) 1997-2004 Sun Microsystems, Inc. All Rights Reserved.
 *
 * See the file "LICENSE.txt" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */
package org.pnuts.lib;

import pnuts.lang.PnutsFunction;
import pnuts.lang.Context;
import pnuts.lang.Package;
import pnuts.lang.Executable;
import java.lang.reflect.Member;
import java.lang.reflect.Modifier;

public class modifiers implements Executable {

  static class ModifierChecker extends PnutsFunction {
    private int mask;

    public ModifierChecker(String name, int mask){
      super(name);
      this.mask = mask;
    }

    public boolean defined(int nargs){
      return nargs == 1;
    }

    protected Object exec(Object[] args, Context context){
      if (args.length != 1){
        undefined(args, context);
      }
      Object target = args[0];
      int modifiers;
      if (target instanceof Class){
        modifiers = ((Class)target).getModifiers();
      } else if (target instanceof Member){
        modifiers = ((Member)target).getModifiers();
      } else {
        throw new IllegalArgumentException();
      }
      if ((mask & modifiers) == mask){
        return Boolean.TRUE;
      } else {
        return Boolean.FALSE;
      }
    }
  }

  static String[] names = {"isAbstract", "isPublic", "isProtected", "isPrivate", "isStatic", "isInterface"};
  static int[] modifiers = {
    Modifier.ABSTRACT,
    Modifier.PUBLIC,
    Modifier.PROTECTED,
    Modifier.PRIVATE,
    Modifier.STATIC,
    Modifier.INTERFACE
  };

  public Object run(Context context){
    Package pkg = Package.getPackage("pnuts.lib", context);
    for (int i = 0; i < names.length; i++){
      pkg.set(names[i].intern(), new ModifierChecker(names[i], modifiers[i]), context);
    }
    return null;
  }
}