Enum Spy
/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * 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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 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 ]" : ""); } }