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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Runtime.Serialization;
namespace Microsoft.Build.Framework
{
/// <summary>
/// Serializable wrapper for immutable metadata dictionaries.
/// Safe to use across AppDomains.
/// </summary>
[Serializable]
internal readonly struct SerializableMetadata : ISerializable
{
/// <summary>
/// Initializes a new instance of the <see cref="SerializableMetadata"/> struct.
/// </summary>
/// <param name="dictionary">The metadata dictionary to set.</param>
/// <remarks>
/// Calling this constructor implies that the instance value is usable. As such, a null input will be converted
/// to an empty instance.
/// </remarks>
public SerializableMetadata(ImmutableDictionary<string, string> dictionary) =>
Dictionary = dictionary ?? ImmutableDictionaryExtensions.EmptyMetadata;
public SerializableMetadata(SerializationInfo info, StreamingContext context)
{
bool hasValue = info.GetBoolean("hasValue");
if (hasValue)
{
object entries = info.GetValue("value", typeof(KeyValuePair<string, string>[]))!;
Dictionary = ImmutableDictionaryExtensions.EmptyMetadata.AddRange((KeyValuePair<string, string>[])entries);
}
}
/// <summary>
/// Gets the backing metadata dictionary.
/// </summary>
internal ImmutableDictionary<string, string>? Dictionary { get; }
/// <summary>
/// Gets a value indicating whether the wrapped dictionary represents a usable instance.
/// </summary>
/// <remarks>
/// Since SerializableMetadata is a struct, this allows the default value to represent an unusable instance.
/// </remarks>
internal bool HasValue => Dictionary != null;
public void GetObjectData(SerializationInfo info, StreamingContext context)
{
info.AddValue("hasValue", HasValue);
if (HasValue)
{
info.AddValue("value", Dictionary!.ToArray());
}
}
}
}
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