Enum Spy : Enum « Reflection « Java






Enum Spy

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 *
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 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

import static java.lang.System.out;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

public class EnumSpy {
  private static final String fmt = "  %11s:  %s %s%n";

  public static void main(String... args) {
    try {
      Class<?> c = Class.forName(args[0]);
      if (!c.isEnum()) {
        out.format("%s is not an enum type%n", c);
        return;
      }
      out.format("Class:  %s%n", c);

      Field[] flds = c.getDeclaredFields();
      List<Field> cst = new ArrayList<Field>(); // enum constants
      List<Field> mbr = new ArrayList<Field>(); // member fields
      for (Field f : flds) {
        if (f.isEnumConstant())
          cst.add(f);
        else
          mbr.add(f);
      }
      if (!cst.isEmpty())
        print(cst, "Constant");
      if (!mbr.isEmpty())
        print(mbr, "Field");

      Constructor[] ctors = c.getDeclaredConstructors();
      for (Constructor ctor : ctors) {
        out.format(fmt, "Constructor", ctor.toGenericString(), synthetic(ctor));
      }

      Method[] mths = c.getDeclaredMethods();
      for (Method m : mths) {
        out.format(fmt, "Method", m.toGenericString(), synthetic(m));
      }

      // production code should handle this exception more gracefully
    } catch (ClassNotFoundException x) {
      x.printStackTrace();
    }
  }

  private static void print(List<Field> lst, String s) {
    for (Field f : lst) {
      out.format(fmt, s, f.toGenericString(), synthetic(f));
    }
  }

  private static String synthetic(Member m) {
    return (m.isSynthetic() ? "[ synthetic ]" : "");
  }
}

 








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