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//-----------------------------------------------------------------------
// <copyright file="GarbageFreeIterators.cs" company="Sirenix IVS">
// Copyright (c) 2018 Sirenix IVS
//
// Licensed 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.
// </copyright>
//-----------------------------------------------------------------------
namespace VRC.Udon.Serialization.OdinSerializer.Utilities
{
using System;
using System.Collections.Generic;
/// <summary>
/// Garbage free enumerator methods.
/// </summary>
public static class GarbageFreeIterators
{
/// <summary>
/// Garbage free enumerator for lists.
/// </summary>
public static ListIterator<T> GFIterator<T>(this List<T> list)
{
return new ListIterator<T>(list);
}
/// <summary>
/// Garbage free enumerator for dictionaries.
/// </summary>
public static DictionaryIterator<T1, T2> GFIterator<T1, T2>(this Dictionary<T1, T2> dictionary)
{
return new DictionaryIterator<T1, T2>(dictionary);
}
/// <summary>
/// Garbage free enumator for dictionary values.
/// </summary>
public static DictionaryValueIterator<T1, T2> GFValueIterator<T1, T2>(this Dictionary<T1, T2> dictionary)
{
return new DictionaryValueIterator<T1, T2>(dictionary);
}
/// <summary>
/// Garbage free enumerator for hashsets.
/// </summary>
public static HashsetIterator<T> GFIterator<T>(this HashSet<T> hashset)
{
return new HashsetIterator<T>(hashset);
}
/// <summary>
/// List iterator.
/// </summary>
public struct ListIterator<T> : IDisposable
{
private bool isNull;
private List<T> list;
private List<T>.Enumerator enumerator;
/// <summary>
/// Creates a list iterator.
/// </summary>
public ListIterator(List<T> list)
{
this.isNull = list == null;
if (this.isNull)
{
this.list = null;
this.enumerator = new List<T>.Enumerator();
}
else
{
this.list = list;
this.enumerator = this.list.GetEnumerator();
}
}
/// <summary>
/// Gets the enumerator.
/// </summary>
public ListIterator<T> GetEnumerator()
{
return this;
}
/// <summary>
/// Gets the current value.
/// </summary>
public T Current
{
get
{
return this.enumerator.Current;
}
}
/// <summary>
/// Moves to the next value.
/// </summary>
public bool MoveNext()
{
if (this.isNull)
{
return false;
}
return this.enumerator.MoveNext();
}
/// <summary>
/// Disposes the iterator.
/// </summary>
public void Dispose()
{
this.enumerator.Dispose();
}
}
/// <summary>
/// Hashset iterator.
/// </summary>
public struct HashsetIterator<T> : IDisposable
{
private bool isNull;
private HashSet<T> hashset;
private HashSet<T>.Enumerator enumerator;
/// <summary>
/// Creates a hashset iterator.
/// </summary>
public HashsetIterator(HashSet<T> hashset)
{
this.isNull = hashset == null;
if (this.isNull)
{
this.hashset = null;
this.enumerator = new HashSet<T>.Enumerator();
}
else
{
this.hashset = hashset;
this.enumerator = this.hashset.GetEnumerator();
}
}
/// <summary>
/// Gets the enumerator.
/// </summary>
public HashsetIterator<T> GetEnumerator()
{
return this;
}
/// <summary>
/// Gets the current value.
/// </summary>
public T Current
{
get
{
return this.enumerator.Current;
}
}
/// <summary>
/// Moves to the next value.
/// </summary>
public bool MoveNext()
{
if (this.isNull)
{
return false;
}
return this.enumerator.MoveNext();
}
/// <summary>
/// Disposes the iterator.
/// </summary>
public void Dispose()
{
this.enumerator.Dispose();
}
}
/// <summary>
/// Dictionary iterator.
/// </summary>
public struct DictionaryIterator<T1, T2> : IDisposable
{
private Dictionary<T1, T2> dictionary;
private Dictionary<T1, T2>.Enumerator enumerator;
private bool isNull;
/// <summary>
/// Creates a dictionary iterator.
/// </summary>
public DictionaryIterator(Dictionary<T1, T2> dictionary)
{
this.isNull = dictionary == null;
if (this.isNull)
{
this.dictionary = null;
this.enumerator = new Dictionary<T1, T2>.Enumerator();
}
else
{
this.dictionary = dictionary;
this.enumerator = this.dictionary.GetEnumerator();
}
}
/// <summary>
/// Gets the enumerator.
/// </summary>
public DictionaryIterator<T1, T2> GetEnumerator()
{
return this;
}
/// <summary>
/// Gets the current value.
/// </summary>
public KeyValuePair<T1, T2> Current
{
get
{
return this.enumerator.Current;
}
}
/// <summary>
/// Moves to the next value.
/// </summary>
public bool MoveNext()
{
if (this.isNull)
{
return false;
}
return this.enumerator.MoveNext();
}
/// <summary>
/// Disposes the iterator.
/// </summary>
public void Dispose()
{
this.enumerator.Dispose();
}
}
/// <summary>
/// Dictionary value iterator.
/// </summary>
public struct DictionaryValueIterator<T1, T2> : IDisposable
{
private Dictionary<T1, T2> dictionary;
private Dictionary<T1, T2>.Enumerator enumerator;
private bool isNull;
/// <summary>
/// Creates a dictionary value iterator.
/// </summary>
public DictionaryValueIterator(Dictionary<T1, T2> dictionary)
{
this.isNull = dictionary == null;
if (this.isNull)
{
this.dictionary = null;
this.enumerator = new Dictionary<T1, T2>.Enumerator();
}
else
{
this.dictionary = dictionary;
this.enumerator = this.dictionary.GetEnumerator();
}
}
/// <summary>
/// Gets the enumerator.
/// </summary>
public DictionaryValueIterator<T1, T2> GetEnumerator()
{
return this;
}
/// <summary>
/// Gets the current value.
/// </summary>
public T2 Current
{
get
{
return this.enumerator.Current.Value;
}
}
/// <summary>
/// Moves to the next value.
/// </summary>
public bool MoveNext()
{
if (this.isNull)
{
return false;
}
return this.enumerator.MoveNext();
}
/// <summary>
/// Disposes the iterator.
/// </summary>
public void Dispose()
{
this.enumerator.Dispose();
}
}
}
}
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