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EncoderGroup.cs
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79 lines (71 loc) · 2.64 KB
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namespace Python.Runtime.Codecs
{
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
/// <summary>
/// Represents a group of <see cref="IPyObjectDecoder"/>s. Useful to group them by priority.
/// </summary>
[Obsolete(Util.UnstableApiMessage)]
public sealed class EncoderGroup: IPyObjectEncoder, IEnumerable<IPyObjectEncoder>
{
readonly List<IPyObjectEncoder> encoders = new List<IPyObjectEncoder>();
/// <summary>
/// Add specified encoder to the group
/// </summary>
public void Add(IPyObjectEncoder item)
{
if (item is null) throw new ArgumentNullException(nameof(item));
this.encoders.Add(item);
}
/// <summary>
/// Remove all encoders from the group
/// </summary>
public void Clear() => this.encoders.Clear();
/// <inheritdoc />
public bool CanEncode(Type type) => this.encoders.Any(encoder => encoder.CanEncode(type));
/// <inheritdoc />
public PyObject TryEncode(object value)
{
if (value is null) throw new ArgumentNullException(nameof(value));
foreach (var encoder in this.GetEncoders(value.GetType()))
{
var result = encoder.TryEncode(value);
if (result != null)
{
return result;
}
}
return null;
}
/// <inheritdoc />
public IEnumerator<IPyObjectEncoder> GetEnumerator() => this.encoders.GetEnumerator();
IEnumerator IEnumerable.GetEnumerator() => this.encoders.GetEnumerator();
}
[Obsolete(Util.UnstableApiMessage)]
public static class EncoderGroupExtensions
{
/// <summary>
/// Gets specific instances of <see cref="IPyObjectEncoder"/>
/// (potentially selecting one from a collection),
/// that can encode the specified <paramref name="type"/>.
/// </summary>
[Obsolete(Util.UnstableApiMessage)]
public static IEnumerable<IPyObjectEncoder> GetEncoders(this IPyObjectEncoder decoder, Type type)
{
if (decoder is null) throw new ArgumentNullException(nameof(decoder));
if (decoder is IEnumerable<IPyObjectEncoder> composite)
{
foreach (var nestedEncoder in composite)
foreach (var match in nestedEncoder.GetEncoders(type))
{
yield return match;
}
} else if (decoder.CanEncode(type))
{
yield return decoder;
}
}
}
}