/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;
using System.Collections.Generic;
using System.Text;

namespace Lucene.Net.Search.Vectorhighlight
{
    static class Extensions
    {
        public static V Get<K, V>(this Dictionary<K, V> list, K key)
        {
            if (key == null) return default(V);
            V v = default(V);
            list.TryGetValue(key, out v);
            return v;
        }
    }

    public class HashSet<T> : Dictionary<T, T>
    {
        public void Add(T key)
        {
            base.Add(key, key);
        }
    }
}

namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Method)]
    public sealed class ExtensionAttribute : Attribute
    {
        public ExtensionAttribute() { }
    }
}