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CollectionFormatters.cs
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CollectionFormatters.cs
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using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using Utf8Json.Formatters.Internal;
using Utf8Json.Internal;
namespace Utf8Json.Formatters
{
public class ArrayFormatter<T> : IJsonFormatter<T[]>
{
static readonly ArrayPool<T> arrayPool = new ArrayPool<T>(99);
public void Serialize(ref JsonWriter writer, T[] value, IJsonFormatterResolver formatterResolver)
{
if (value == null) { writer.WriteNull(); return; }
writer.WriteBeginArray();
var formatter = formatterResolver.GetFormatter<T>();
if (value.Length != 0)
{
formatter.Serialize(ref writer, value[0], formatterResolver);
}
for (int i = 1; i < value.Length; i++)
{
writer.WriteValueSeparator();
formatter.Serialize(ref writer, value[i], formatterResolver);
}
writer.WriteEndArray();
}
public T[] Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull()) return null;
var count = 0;
var formatter = formatterResolver.GetFormatter<T>();
var workingArea = arrayPool.Rent();
try
{
var array = workingArea;
reader.ReadIsBeginArrayWithVerify();
while (!reader.ReadIsEndArrayWithSkipValueSeparator(ref count))
{
if (array.Length < count)
{
Array.Resize<T>(ref array, array.Length * 2);
}
array[count - 1] = formatter.Deserialize(ref reader, formatterResolver);
}
var result = new T[count];
Array.Copy(array, result, count);
Array.Clear(workingArea, 0, Math.Min(count, workingArea.Length));
return result;
}
finally
{
arrayPool.Return(workingArea);
}
}
}
public class ArraySegmentFormatter<T> : IJsonFormatter<ArraySegment<T>>
{
static readonly ArrayPool<T> arrayPool = new ArrayPool<T>(99);
public void Serialize(ref JsonWriter writer, ArraySegment<T> value, IJsonFormatterResolver formatterResolver)
{
if (value.Array == null) { writer.WriteNull(); return; }
var array = value.Array;
var offset = value.Offset;
var count = value.Count;
writer.WriteBeginArray();
var formatter = formatterResolver.GetFormatter<T>();
if (count != 0)
{
formatter.Serialize(ref writer, value.Array[offset], formatterResolver);
}
for (int i = 1; i < count; i++)
{
writer.WriteValueSeparator();
formatter.Serialize(ref writer, array[offset + i], formatterResolver);
}
writer.WriteEndArray();
}
public ArraySegment<T> Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull()) return default(ArraySegment<T>);
var count = 0;
var formatter = formatterResolver.GetFormatter<T>();
var workingArea = arrayPool.Rent();
try
{
var array = workingArea;
reader.ReadIsBeginArrayWithVerify();
while (!reader.ReadIsEndArrayWithSkipValueSeparator(ref count))
{
if (array.Length < count)
{
Array.Resize<T>(ref array, array.Length * 2);
}
array[count - 1] = formatter.Deserialize(ref reader, formatterResolver);
}
var result = new T[count];
Array.Copy(array, result, count);
Array.Clear(workingArea, 0, Math.Min(count, workingArea.Length));
return new ArraySegment<T>(result, 0, result.Length);
}
finally
{
arrayPool.Return(workingArea);
}
}
}
public class ListFormatter<T> : IJsonFormatter<List<T>>
{
public void Serialize(ref JsonWriter writer, List<T> value, IJsonFormatterResolver formatterResolver)
{
if (value == null) { writer.WriteNull(); return; }
writer.WriteBeginArray();
var formatter = formatterResolver.GetFormatter<T>();
if (value.Count != 0)
{
formatter.Serialize(ref writer, value[0], formatterResolver);
}
for (int i = 1; i < value.Count; i++)
{
writer.WriteValueSeparator();
formatter.Serialize(ref writer, value[i], formatterResolver);
}
writer.WriteEndArray();
}
public List<T> Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull()) return null;
var count = 0;
var formatter = formatterResolver.GetFormatter<T>();
var list = new List<T>();
reader.ReadIsBeginArrayWithVerify();
while (!reader.ReadIsEndArrayWithSkipValueSeparator(ref count))
{
list.Add(formatter.Deserialize(ref reader, formatterResolver));
}
return list;
}
}
public abstract class CollectionFormatterBase<TElement, TIntermediate, TEnumerator, TCollection> : IJsonFormatter<TCollection>
where TCollection : class, IEnumerable<TElement>
where TEnumerator : IEnumerator<TElement>
{
public void Serialize(ref JsonWriter writer, TCollection value, IJsonFormatterResolver formatterResolver)
{
if (value == null)
{
writer.WriteNull();
}
else
{
writer.WriteBeginArray();
var formatter = formatterResolver.GetFormatterWithVerify<TElement>();
// Unity's foreach struct enumerator causes boxing so iterate manually.
var e = GetSourceEnumerator(value);
try
{
var isFirst = true;
while (e.MoveNext())
{
if (isFirst)
{
isFirst = false;
}
else
{
writer.WriteValueSeparator();
}
formatter.Serialize(ref writer, e.Current, formatterResolver);
}
}
finally
{
e.Dispose();
}
writer.WriteEndArray();
}
}
public TCollection Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull())
{
return null;
}
else
{
var formatter = formatterResolver.GetFormatterWithVerify<TElement>();
var builder = Create();
var count = 0;
reader.ReadIsBeginArrayWithVerify();
while (!reader.ReadIsEndArrayWithSkipValueSeparator(ref count))
{
Add(ref builder, count - 1, formatter.Deserialize(ref reader, formatterResolver));
}
return Complete(ref builder);
}
}
// Some collections can use struct iterator, this is optimization path
protected abstract TEnumerator GetSourceEnumerator(TCollection source);
// abstraction for deserialize
protected abstract TIntermediate Create();
protected abstract void Add(ref TIntermediate collection, int index, TElement value);
protected abstract TCollection Complete(ref TIntermediate intermediateCollection);
}
public abstract class CollectionFormatterBase<TElement, TIntermediate, TCollection> : CollectionFormatterBase<TElement, TIntermediate, IEnumerator<TElement>, TCollection>
where TCollection : class, IEnumerable<TElement>
{
protected override IEnumerator<TElement> GetSourceEnumerator(TCollection source)
{
return source.GetEnumerator();
}
}
public abstract class CollectionFormatterBase<TElement, TCollection> : CollectionFormatterBase<TElement, TCollection, TCollection>
where TCollection : class, IEnumerable<TElement>
{
protected sealed override TCollection Complete(ref TCollection intermediateCollection)
{
return intermediateCollection;
}
}
public sealed class GenericCollectionFormatter<TElement, TCollection> : CollectionFormatterBase<TElement, TCollection>
where TCollection : class, ICollection<TElement>, new()
{
protected override TCollection Create()
{
return new TCollection();
}
protected override void Add(ref TCollection collection, int index, TElement value)
{
collection.Add(value);
}
}
public sealed class LinkedListFormatter<T> : CollectionFormatterBase<T, LinkedList<T>, LinkedList<T>.Enumerator, LinkedList<T>>
{
protected override void Add(ref LinkedList<T> collection, int index, T value)
{
collection.AddLast(value);
}
protected override LinkedList<T> Complete(ref LinkedList<T> intermediateCollection)
{
return intermediateCollection;
}
protected override LinkedList<T> Create()
{
return new LinkedList<T>();
}
protected override LinkedList<T>.Enumerator GetSourceEnumerator(LinkedList<T> source)
{
return source.GetEnumerator();
}
}
public sealed class QeueueFormatter<T> : CollectionFormatterBase<T, Queue<T>, Queue<T>.Enumerator, Queue<T>>
{
protected override void Add(ref Queue<T> collection, int index, T value)
{
collection.Enqueue(value);
}
protected override Queue<T> Create()
{
return new Queue<T>();
}
protected override Queue<T>.Enumerator GetSourceEnumerator(Queue<T> source)
{
return source.GetEnumerator();
}
protected override Queue<T> Complete(ref Queue<T> intermediateCollection)
{
return intermediateCollection;
}
}
// should deserialize reverse order.
public sealed class StackFormatter<T> : CollectionFormatterBase<T, ArrayBuffer<T>, Stack<T>.Enumerator, Stack<T>>
{
protected override void Add(ref ArrayBuffer<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ArrayBuffer<T> Create()
{
return new ArrayBuffer<T>(4);
}
protected override Stack<T>.Enumerator GetSourceEnumerator(Stack<T> source)
{
return source.GetEnumerator();
}
protected override Stack<T> Complete(ref ArrayBuffer<T> intermediateCollection)
{
var bufArray = intermediateCollection.Buffer;
var stack = new Stack<T>(intermediateCollection.Size);
for (int i = intermediateCollection.Size - 1; i >= 0; i--)
{
stack.Push(bufArray[i]);
}
return stack;
}
}
public sealed class HashSetFormatter<T> : CollectionFormatterBase<T, HashSet<T>, HashSet<T>.Enumerator, HashSet<T>>
{
protected override void Add(ref HashSet<T> collection, int index, T value)
{
collection.Add(value);
}
protected override HashSet<T> Complete(ref HashSet<T> intermediateCollection)
{
return intermediateCollection;
}
protected override HashSet<T> Create()
{
return new HashSet<T>();
}
protected override HashSet<T>.Enumerator GetSourceEnumerator(HashSet<T> source)
{
return source.GetEnumerator();
}
}
public sealed class ReadOnlyCollectionFormatter<T> : CollectionFormatterBase<T, ArrayBuffer<T>, ReadOnlyCollection<T>>
{
protected override void Add(ref ArrayBuffer<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ReadOnlyCollection<T> Complete(ref ArrayBuffer<T> intermediateCollection)
{
return new ReadOnlyCollection<T>(intermediateCollection.ToArray());
}
protected override ArrayBuffer<T> Create()
{
return new ArrayBuffer<T>(4);
}
}
public sealed class InterfaceListFormatter<T> : CollectionFormatterBase<T, List<T>, IList<T>>
{
protected override void Add(ref List<T> collection, int index, T value)
{
collection.Add(value);
}
protected override List<T> Create()
{
return new List<T>();
}
protected override IList<T> Complete(ref List<T> intermediateCollection)
{
return intermediateCollection;
}
}
public sealed class InterfaceCollectionFormatter<T> : CollectionFormatterBase<T, List<T>, ICollection<T>>
{
protected override void Add(ref List<T> collection, int index, T value)
{
collection.Add(value);
}
protected override List<T> Create()
{
return new List<T>();
}
protected override ICollection<T> Complete(ref List<T> intermediateCollection)
{
return intermediateCollection;
}
}
public sealed class InterfaceEnumerableFormatter<T> : CollectionFormatterBase<T, ArrayBuffer<T>, IEnumerable<T>>
{
protected override void Add(ref ArrayBuffer<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ArrayBuffer<T> Create()
{
return new ArrayBuffer<T>(4);
}
protected override IEnumerable<T> Complete(ref ArrayBuffer<T> intermediateCollection)
{
return intermediateCollection.ToArray();
}
}
// {Key:key, Elements:[Array]} (not compatible with JSON.NET)
public sealed class InterfaceGroupingFormatter<TKey, TElement> : IJsonFormatter<IGrouping<TKey, TElement>>
{
public void Serialize(ref JsonWriter writer, IGrouping<TKey, TElement> value, IJsonFormatterResolver formatterResolver)
{
if (value == null)
{
writer.WriteNull();
return;
}
else
{
writer.WriteRaw(CollectionFormatterHelper.groupingName[0]);
formatterResolver.GetFormatterWithVerify<TKey>().Serialize(ref writer, value.Key, formatterResolver);
writer.WriteRaw(CollectionFormatterHelper.groupingName[1]);
formatterResolver.GetFormatterWithVerify<IEnumerable<TElement>>().Serialize(ref writer, value.AsEnumerable(), formatterResolver);
writer.WriteEndObject();
}
}
public IGrouping<TKey, TElement> Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull())
{
return null;
}
else
{
TKey resultKey = default(TKey);
IEnumerable<TElement> resultValue = default(IEnumerable<TElement>);
reader.ReadIsBeginObjectWithVerify();
var count = 0;
while (!reader.ReadIsEndObjectWithSkipValueSeparator(ref count))
{
var keyString = reader.ReadPropertyNameSegmentUnescaped();
int key;
#if NETSTANDARD
CollectionFormatterHelper.groupingAutomata.TryGetValue(keyString, out key);
#else
CollectionFormatterHelper.groupingAutomata.TryGetValueSafe(keyString, out key);
#endif
switch (key)
{
case 0:
resultKey = formatterResolver.GetFormatterWithVerify<TKey>().Deserialize(ref reader, formatterResolver);
break;
case 1:
resultValue = formatterResolver.GetFormatterWithVerify<IEnumerable<TElement>>().Deserialize(ref reader, formatterResolver);
break;
default:
reader.ReadNextBlock();
break;
}
}
return new Grouping<TKey, TElement>(resultKey, resultValue);
}
}
}
public sealed class InterfaceLookupFormatter<TKey, TElement> : IJsonFormatter<ILookup<TKey, TElement>>
{
public void Serialize(ref JsonWriter writer, ILookup<TKey, TElement> value, IJsonFormatterResolver formatterResolver)
{
if (value == null)
{
writer.WriteNull();
return;
}
else
{
formatterResolver.GetFormatterWithVerify<IEnumerable<IGrouping<TKey, TElement>>>().Serialize(ref writer, value.AsEnumerable(), formatterResolver);
}
}
public ILookup<TKey, TElement> Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull())
{
return null;
}
else
{
if (reader.ReadIsNull()) return null;
var count = 0;
var formatter = formatterResolver.GetFormatterWithVerify<IGrouping<TKey, TElement>>();
var intermediateCollection = new Dictionary<TKey, IGrouping<TKey, TElement>>();
reader.ReadIsBeginArrayWithVerify();
while (!reader.ReadIsEndArrayWithSkipValueSeparator(ref count))
{
var g = formatter.Deserialize(ref reader, formatterResolver);
intermediateCollection.Add(g.Key, g);
}
return new Lookup<TKey, TElement>(intermediateCollection);
}
}
}
class Grouping<TKey, TElement> : IGrouping<TKey, TElement>
{
readonly TKey key;
readonly IEnumerable<TElement> elements;
public Grouping(TKey key, IEnumerable<TElement> elements)
{
this.key = key;
this.elements = elements;
}
public TKey Key
{
get
{
return key;
}
}
public IEnumerator<TElement> GetEnumerator()
{
return elements.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
class Lookup<TKey, TElement> : ILookup<TKey, TElement>
{
readonly Dictionary<TKey, IGrouping<TKey, TElement>> groupings;
public Lookup(Dictionary<TKey, IGrouping<TKey, TElement>> groupings)
{
this.groupings = groupings;
}
public IEnumerable<TElement> this[TKey key]
{
get
{
return groupings[key];
}
}
public int Count
{
get
{
return groupings.Count;
}
}
public bool Contains(TKey key)
{
return groupings.ContainsKey(key);
}
public IEnumerator<IGrouping<TKey, TElement>> GetEnumerator()
{
return groupings.Values.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return groupings.Values.GetEnumerator();
}
}
// NonGenerics
public sealed class NonGenericListFormatter<T> : IJsonFormatter<T>
where T : class, IList, new()
{
public void Serialize(ref JsonWriter writer, T value, IJsonFormatterResolver formatterResolver)
{
if (value == null)
{
writer.WriteNull();
return;
}
var formatter = formatterResolver.GetFormatterWithVerify<object>();
writer.WriteBeginArray();
if (value.Count != 0)
{
formatter.Serialize(ref writer, value[0], formatterResolver);
}
for (int i = 1; i < value.Count; i++)
{
writer.WriteValueSeparator();
formatter.Serialize(ref writer, value[i], formatterResolver);
}
writer.WriteEndArray();
}
public T Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull()) return null;
var count = 0;
var formatter = formatterResolver.GetFormatter<object>();
var list = new T();
reader.ReadIsBeginArrayWithVerify();
while (!reader.ReadIsEndArrayWithSkipValueSeparator(ref count))
{
list.Add(formatter.Deserialize(ref reader, formatterResolver));
}
return list;
}
}
public sealed class NonGenericInterfaceListFormatter : IJsonFormatter<IList>
{
public static readonly IJsonFormatter<IList> Default = new NonGenericInterfaceListFormatter();
public void Serialize(ref JsonWriter writer, IList value, IJsonFormatterResolver formatterResolver)
{
if (value == null)
{
writer.WriteNull();
return;
}
var formatter = formatterResolver.GetFormatterWithVerify<object>();
writer.WriteBeginArray();
if (value.Count != 0)
{
formatter.Serialize(ref writer, value[0], formatterResolver);
}
for (int i = 1; i < value.Count; i++)
{
writer.WriteValueSeparator();
formatter.Serialize(ref writer, value[i], formatterResolver);
}
writer.WriteEndArray();
}
public IList Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
if (reader.ReadIsNull()) return null;
var count = 0;
var formatter = formatterResolver.GetFormatter<object>();
var list = new List<object>();
reader.ReadIsBeginArrayWithVerify();
while (!reader.ReadIsEndArrayWithSkipValueSeparator(ref count))
{
list.Add(formatter.Deserialize(ref reader, formatterResolver));
}
return list;
}
}
#if NETSTANDARD
public sealed class ObservableCollectionFormatter<T> : CollectionFormatterBase<T, ObservableCollection<T>>
{
protected override void Add(ref ObservableCollection<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ObservableCollection<T> Create()
{
return new ObservableCollection<T>();
}
}
public sealed class ReadOnlyObservableCollectionFormatter<T> : CollectionFormatterBase<T, ObservableCollection<T>, ReadOnlyObservableCollection<T>>
{
protected override void Add(ref ObservableCollection<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ObservableCollection<T> Create()
{
return new ObservableCollection<T>();
}
protected override ReadOnlyObservableCollection<T> Complete(ref ObservableCollection<T> intermediateCollection)
{
return new ReadOnlyObservableCollection<T>(intermediateCollection);
}
}
public sealed class InterfaceReadOnlyListFormatter<T> : CollectionFormatterBase<T, ArrayBuffer<T>, IReadOnlyList<T>>
{
protected override void Add(ref ArrayBuffer<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ArrayBuffer<T> Create()
{
return new ArrayBuffer<T>(4);
}
protected override IReadOnlyList<T> Complete(ref ArrayBuffer<T> intermediateCollection)
{
return intermediateCollection.ToArray();
}
}
public sealed class InterfaceReadOnlyCollectionFormatter<T> : CollectionFormatterBase<T, ArrayBuffer<T>, IReadOnlyCollection<T>>
{
protected override void Add(ref ArrayBuffer<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ArrayBuffer<T> Create()
{
return new ArrayBuffer<T>(4);
}
protected override IReadOnlyCollection<T> Complete(ref ArrayBuffer<T> intermediateCollection)
{
return intermediateCollection.ToArray();
}
}
public sealed class InterfaceSetFormatter<T> : CollectionFormatterBase<T, HashSet<T>, ISet<T>>
{
protected override void Add(ref HashSet<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ISet<T> Complete(ref HashSet<T> intermediateCollection)
{
return intermediateCollection;
}
protected override HashSet<T> Create()
{
return new HashSet<T>();
}
}
public sealed class ConcurrentBagFormatter<T> : CollectionFormatterBase<T, System.Collections.Concurrent.ConcurrentBag<T>>
{
protected override void Add(ref ConcurrentBag<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ConcurrentBag<T> Create()
{
return new ConcurrentBag<T>();
}
}
public sealed class ConcurrentQueueFormatter<T> : CollectionFormatterBase<T, System.Collections.Concurrent.ConcurrentQueue<T>>
{
protected override void Add(ref ConcurrentQueue<T> collection, int index, T value)
{
collection.Enqueue(value);
}
protected override ConcurrentQueue<T> Create()
{
return new ConcurrentQueue<T>();
}
}
public sealed class ConcurrentStackFormatter<T> : CollectionFormatterBase<T, ArrayBuffer<T>, ConcurrentStack<T>>
{
protected override void Add(ref ArrayBuffer<T> collection, int index, T value)
{
collection.Add(value);
}
protected override ArrayBuffer<T> Create()
{
return new ArrayBuffer<T>(4);
}
protected override ConcurrentStack<T> Complete(ref ArrayBuffer<T> intermediateCollection)
{
var bufArray = intermediateCollection.Buffer;
var stack = new ConcurrentStack<T>();
for (int i = intermediateCollection.Size - 1; i >= 0; i--)
{
stack.Push(bufArray[i]);
}
return stack;
}
}
#endif
}
namespace Utf8Json.Formatters.Internal
{
internal static class CollectionFormatterHelper
{
internal static readonly byte[][] groupingName;
internal static readonly AutomataDictionary groupingAutomata;
static CollectionFormatterHelper()
{
groupingName = new byte[][]
{
JsonWriter.GetEncodedPropertyNameWithBeginObject("Key"),
JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator("Elements"),
};
groupingAutomata = new AutomataDictionary
{
{JsonWriter.GetEncodedPropertyNameWithoutQuotation("Key"), 0 },
{JsonWriter.GetEncodedPropertyNameWithoutQuotation("Elements"), 1 },
};
}
}
}