Mega Code Archive
Enum Spy
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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
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*
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*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
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*
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* 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
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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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