Spy.java Source code

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Here is the source code for Spy.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.Field;
import java.lang.reflect.Modifier;

enum Spy {
    BLACK, WHITE
}

public class Main {
    volatile int share;
    int instance;

    class Inner {
    }

    public static void main(String... args) {
        try {
            Class<?> c = Class.forName(args[0]);
            int searchMods = 0x0;
            for (int i = 1; i < args.length; i++) {
                searchMods |= modifierFromString(args[i]);
            }

            Field[] flds = c.getDeclaredFields();
            out.format("Fields in Class '%s' containing modifiers:  %s%n", c.getName(),
                    Modifier.toString(searchMods));
            boolean found = false;
            for (Field f : flds) {
                int foundMods = f.getModifiers();
                // Require all of the requested modifiers to be present
                if ((foundMods & searchMods) == searchMods) {
                    out.format("%-8s [ synthetic=%-5b enum_constant=%-5b ]%n", f.getName(), f.isSynthetic(),
                            f.isEnumConstant());
                    found = true;
                }
            }

            if (!found) {
                out.format("No matching fields%n");
            }

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

    private static int modifierFromString(String s) {
        int m = 0x0;
        if ("public".equals(s))
            m |= Modifier.PUBLIC;
        else if ("protected".equals(s))
            m |= Modifier.PROTECTED;
        else if ("private".equals(s))
            m |= Modifier.PRIVATE;
        else if ("static".equals(s))
            m |= Modifier.STATIC;
        else if ("final".equals(s))
            m |= Modifier.FINAL;
        else if ("transient".equals(s))
            m |= Modifier.TRANSIENT;
        else if ("volatile".equals(s))
            m |= Modifier.VOLATILE;
        return m;
    }
}