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/*
 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package org.k3a;

import java.nio.file.CopyOption;
import java.nio.file.OpenOption;
import java.nio.file.WatchEvent;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Provides support for handling JDK-specific OpenOption, CopyOption and
 * WatchEvent.Modifier types.
 */

public final class ExtendedOptions {

    // maps InternalOption to ExternalOption
    private static final Map, Wrapper> internalToExternal
        = new ConcurrentHashMap<>();

    /**
     * Wraps an option or modifier.
     */
    private static final class Wrapper {
        private final Object option;
        private final T param;

        Wrapper(Object option, T param) {
            this.option = option;
            this.param = param;
        }

        T parameter() {
            return param;
        }
    }

    /**
     * The internal version of a JDK-specific OpenOption, CopyOption or
     * WatchEvent.Modifier.
     */
    public static final class InternalOption {

        InternalOption() { }

        private void registerInternal(Object option, T param) {
            Wrapper wrapper = new Wrapper(option, param);
            internalToExternal.put(this, wrapper);
        }

        /**
         * Register this internal option as a OpenOption.
         */
        public void register(OpenOption option) {
            registerInternal(option, null);
        }

        /**
         * Register this internal option as a CopyOption.
         */
        public void register(CopyOption option) {
            registerInternal(option, null);
        }

        /**
         * Register this internal option as a WatchEvent.Modifier.
         */
        public void register(WatchEvent.Modifier option) {
            registerInternal(option, null);
        }

        /**
         * Register this internal option as a WatchEvent.Modifier with the
         * given parameter.
         */
        public void register(WatchEvent.Modifier option, T param) {
            registerInternal(option, param);
        }

        /**
         * Returns true if the given option (or modifier) maps to this internal
         * option.
         */
        public boolean matches(Object option) {
            Wrapper  wrapper = internalToExternal.get(this);
            if (wrapper == null)
                return false;
            else
                return option == wrapper.option;
        }

        /**
         * Returns the parameter object associated with this internal option.
         */
        @SuppressWarnings("unchecked")
        public T parameter() {
            Wrapper wrapper = internalToExternal.get(this);
            if (wrapper == null)
                return null;
            else
                return (T) wrapper.parameter();
        }
    }

    // Internal equivalents of the options and modifiers defined in
    // package com.sun.nio.file

    public static final InternalOption INTERRUPTIBLE = new InternalOption<>();

    public static final InternalOption NOSHARE_READ = new InternalOption<>();
    public static final InternalOption NOSHARE_WRITE = new InternalOption<>();
    public static final InternalOption NOSHARE_DELETE = new InternalOption<>();

    public static final InternalOption FILE_TREE = new InternalOption<>();

    public static final InternalOption DIRECT = new InternalOption<>();

    public static final InternalOption SENSITIVITY_HIGH = new InternalOption<>();
    public static final InternalOption SENSITIVITY_MEDIUM = new InternalOption<>();
    public static final InternalOption SENSITIVITY_LOW = new InternalOption<>();
}