EnumSpy.java Source code

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Here is the source code for EnumSpy.java

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/*
 * 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 ]" : "");
    }
}