csharp-sdk-upm/Libs/Newtonsoft.Json.AOT/Linq/JEnumerable.cs

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2021-03-31 11:22:02 +08:00
#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Collections.Generic;
#if !HAVE_LINQ
using LC.Newtonsoft.Json.Utilities.LinqBridge;
#else
using System.Linq;
#endif
using LC.Newtonsoft.Json.Utilities;
using System.Collections;
namespace LC.Newtonsoft.Json.Linq
{
/// <summary>
/// Represents a collection of <see cref="JToken"/> objects.
/// </summary>
/// <typeparam name="T">The type of token.</typeparam>
public readonly struct JEnumerable<T> : IJEnumerable<T>, IEquatable<JEnumerable<T>> where T : JToken
{
/// <summary>
/// An empty collection of <see cref="JToken"/> objects.
/// </summary>
public static readonly JEnumerable<T> Empty = new JEnumerable<T>(Enumerable.Empty<T>());
private readonly IEnumerable<T> _enumerable;
/// <summary>
/// Initializes a new instance of the <see cref="JEnumerable{T}"/> struct.
/// </summary>
/// <param name="enumerable">The enumerable.</param>
public JEnumerable(IEnumerable<T> enumerable)
{
ValidationUtils.ArgumentNotNull(enumerable, nameof(enumerable));
_enumerable = enumerable;
}
/// <summary>
/// Returns an enumerator that can be used to iterate through the collection.
/// </summary>
/// <returns>
/// A <see cref="IEnumerator{T}"/> that can be used to iterate through the collection.
/// </returns>
public IEnumerator<T> GetEnumerator()
{
return (_enumerable ?? Empty).GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
/// <summary>
/// Gets the <see cref="IJEnumerable{T}"/> of <see cref="JToken"/> with the specified key.
/// </summary>
/// <value></value>
public IJEnumerable<JToken> this[object key]
{
get
{
if (_enumerable == null)
{
return JEnumerable<JToken>.Empty;
}
return new JEnumerable<JToken>(_enumerable.Values<T, JToken>(key)!);
}
}
/// <summary>
/// Determines whether the specified <see cref="JEnumerable{T}"/> is equal to this instance.
/// </summary>
/// <param name="other">The <see cref="JEnumerable{T}"/> to compare with this instance.</param>
/// <returns>
/// <c>true</c> if the specified <see cref="JEnumerable{T}"/> is equal to this instance; otherwise, <c>false</c>.
/// </returns>
public bool Equals(JEnumerable<T> other)
{
return Equals(_enumerable, other._enumerable);
}
/// <summary>
/// Determines whether the specified <see cref="Object"/> is equal to this instance.
/// </summary>
/// <param name="obj">The <see cref="Object"/> to compare with this instance.</param>
/// <returns>
/// <c>true</c> if the specified <see cref="Object"/> is equal to this instance; otherwise, <c>false</c>.
/// </returns>
public override bool Equals(object obj)
{
if (obj is JEnumerable<T> enumerable)
{
return Equals(enumerable);
}
return false;
}
/// <summary>
/// Returns a hash code for this instance.
/// </summary>
/// <returns>
/// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.
/// </returns>
public override int GetHashCode()
{
if (_enumerable == null)
{
return 0;
}
return _enumerable.GetHashCode();
}
}
}