132 lines
4.4 KiB
C#
132 lines
4.4 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="ListSegment"
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// Project: StgSharp
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// AuthorGroup: Nitload
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// Copyright (c) Nitload. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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using System.Xml.Serialization;
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namespace StgSharp.Collections
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{
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/// <summary>
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/// Part of a collection. This contains a direct reference to _origin collection, so all
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/// change to _origin collection will be reflected in this object.
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/// </summary>
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/// <typeparam name="T">
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///
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/// </typeparam>
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public struct ListSegment<T> : ICollection<T>
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{
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private int _begin;
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private int _length;
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private List<T> _collection;
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public ListSegment(List<T> collection, int begin, int length)
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{
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ArgumentNullException.ThrowIfNull(collection);
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ArgumentOutOfRangeException.ThrowIfLessThan(begin, 0);
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ArgumentOutOfRangeException.ThrowIfLessThan(length, 0);
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ArgumentOutOfRangeException.ThrowIfLessThan(begin + length, collection.Count);
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_collection = collection;
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_begin = begin;
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_length = length;
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}
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public T this[int indexValue]
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{
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get
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{
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ArgumentOutOfRangeException.ThrowIfLessThan(indexValue, 0);
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ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqual(indexValue, _length);
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return _collection[indexValue + _begin];
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}
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}
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public T this[Index i]
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{
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get
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{
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int offset = i.IsFromEnd ? _length - i.Value : i.Value;
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ArgumentOutOfRangeException.ThrowIfLessThan(offset, 0);
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ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqual(offset, _length);
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return _collection[offset + _begin];
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}
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}
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public bool IsReadOnly => true;
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public int Count => _length;
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public bool Contains(T item)
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{
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int index = _collection.IndexOf(item);
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return index >= _begin && index < _length + index;
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}
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public void CopyTo(T[] array, int arrayIndex)
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{
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ArgumentNullException.ThrowIfNull(array);
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Span<T> span = CollectionsMarshal.AsSpan<T>(_collection).Slice(_begin, _length);
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Span<T> target = new Span<T>(array, arrayIndex, _length);
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span.CopyTo(target);
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}
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public IEnumerator<T> GetEnumerator()
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{
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for (int i = _begin; i < _length; i++) {
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yield return this[i];
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}
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}
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void ICollection<T>.Add(T item)
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{
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throw new NotSupportedException();
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}
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void ICollection<T>.Clear()
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{
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throw new NotSupportedException();
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}
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bool ICollection<T>.Remove(T item)
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{
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throw new NotSupportedException();
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}
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IEnumerator IEnumerable.GetEnumerator()
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{
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return GetEnumerator();
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}
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}
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}
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