135 lines
4.6 KiB
C#
135 lines
4.6 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="ListSegment.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 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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