Subversion Repositories SmartDukaan

/**
 * 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;
using System.Collections.Generic;

namespace Thrift.Collections
{
        public class THashSet<T> : ICollection<T>
        {
#if NET_2_0
                TDictSet<T> set = new TDictSet<T>();
#else
                HashSet<T> set = new HashSet<T>();
#endif
                public int Count
                {
                        get { return set.Count; }
                }

                public bool IsReadOnly
                {
                        get { return false; }
                }

                public void Add(T item)
                {
                        set.Add(item);
                }

                public void Clear()
                {
                        set.Clear();
                }

                public bool Contains(T item)
                {
                        return set.Contains(item);
                }

                public void CopyTo(T[] array, int arrayIndex)
                {
                        set.CopyTo(array, arrayIndex);
                }

                public IEnumerator GetEnumerator()
                {
                        return set.GetEnumerator();
                }

                IEnumerator<T> IEnumerable<T>.GetEnumerator()
                {
                        return ((IEnumerable<T>)set).GetEnumerator();
                }

                public bool Remove(T item)
                {
                        return set.Remove(item);
                }

#if NET_2_0
                private class TDictSet<V> : ICollection<V>
                {
                        Dictionary<V, TDictSet<V>> dict = new Dictionary<V, TDictSet<V>>();

                        public int Count
                        {
                                get { return dict.Count; }
                        }

                        public bool IsReadOnly
                        {
                                get { return false; }
                        }

                        public IEnumerator GetEnumerator()
                        {
                                return ((IEnumerable)dict.Keys).GetEnumerator();
                        }

                        IEnumerator<V> IEnumerable<V>.GetEnumerator()
                        {
                                return dict.Keys.GetEnumerator();
                        }

                        public bool Add(V item)
                        {
                                if (!dict.ContainsKey(item))
                                {
                                        dict[item] = this;
                                        return true;
                                }

                                return false;
                        }

                        void ICollection<V>.Add(V item)
                        {
                                Add(item);
                        }

                        public void Clear()
                        {
                                dict.Clear();
                        }

                        public bool Contains(V item)
                        {
                                return dict.ContainsKey(item);
                        }

                        public void CopyTo(V[] array, int arrayIndex)
                        {
                                dict.Keys.CopyTo(array, arrayIndex);
                        }

                        public bool Remove(V item)
                        {
                                return dict.Remove(item);
                        }
                }
#endif
        }

}