/*

 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.nio.ch;

import java.io.*;

import java.lang.reflect.*;

import java.security.AccessController;

import java.security.PrivilegedAction;

class Reflect {                                 // package-private

    private Reflect() { }

    private static class ReflectionError extends Error {

        private static final long serialVersionUID = -8659519328078164097L;

        ReflectionError(Throwable x) {

            super(x);

        }

    }

    private static void setAccessible(final AccessibleObject ao) {

        AccessController.doPrivileged(new PrivilegedAction<Void>() {

                public Void run() {

                    ao.setAccessible(true);

                    return null;

                }});

    }

    static Constructor<?> lookupConstructor(String className,

                                            Class<?>[] paramTypes)

    {

        try {

            Class<?> cl = Class.forName(className);

            Constructor<?> c = cl.getDeclaredConstructor(paramTypes);

            setAccessible(c);

            return c;

        } catch (ClassNotFoundException | NoSuchMethodException x) {

            throw new ReflectionError(x);

        }

    }

    static Object invoke(Constructor<?> c, Object[] args) {

        try {

            return c.newInstance(args);

        } catch (InstantiationException |

                 IllegalAccessException |

                 InvocationTargetException x) {

            throw new ReflectionError(x);

        }

    }

    static Method lookupMethod(String className,

                               String methodName,

                               Class<?>... paramTypes)

    {

        try {

            Class<?> cl = Class.forName(className);

            Method m = cl.getDeclaredMethod(methodName, paramTypes);

            setAccessible(m);

            return m;

        } catch (ClassNotFoundException | NoSuchMethodException x) {

            throw new ReflectionError(x);

        }

    }

    static Object invoke(Method m, Object ob, Object[] args) {

        try {

            return m.invoke(ob, args);

        } catch (IllegalAccessException | InvocationTargetException x) {

            throw new ReflectionError(x);

        }

    }

    static Object invokeIO(Method m, Object ob, Object[] args)

        throws IOException

    {

        try {

            return m.invoke(ob, args);

        } catch (IllegalAccessException x) {

            throw new ReflectionError(x);

        } catch (InvocationTargetException x) {

            if (IOException.class.isInstance(x.getCause()))

                throw (IOException)x.getCause();

            throw new ReflectionError(x);

        }

    }

    static Field lookupField(String className, String fieldName) {

        try {

            Class<?> cl = Class.forName(className);

            Field f = cl.getDeclaredField(fieldName);

            setAccessible(f);

            return f;

        } catch (ClassNotFoundException | NoSuchFieldException x) {

            throw new ReflectionError(x);

        }

    }

    static Object get(Object ob, Field f) {

        try {

            return f.get(ob);

        } catch (IllegalAccessException x) {

            throw new ReflectionError(x);

        }

    }

    static Object get(Field f) {

        return get(null, f);

    }

    static void set(Object ob, Field f, Object val) {

        try {

            f.set(ob, val);

        } catch (IllegalAccessException x) {

            throw new ReflectionError(x);

        }

    }

    static void setInt(Object ob, Field f, int val) {

        try {

            f.setInt(ob, val);

        } catch (IllegalAccessException x) {

            throw new ReflectionError(x);

        }

    }

    static void setBoolean(Object ob, Field f, boolean val) {

        try {

            f.setBoolean(ob, val);

        } catch (IllegalAccessException x) {

            throw new ReflectionError(x);

        }

    }

}