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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.Globalization;
using System.IO;
using Microsoft.Build.Framework;
#nullable disable
namespace Microsoft.Build.BackEnd
{
/// <summary>
/// This delegate is used for objects which do not have public parameterless constructors and must be constructed using
/// another method. When invoked, this delegate should return a new object which has been translated appropriately.
/// </summary>
/// <typeparam name="T">The type to be translated.</typeparam>
internal delegate T NodePacketValueFactory<T>(ITranslator translator);
/// <summary>
/// Delegate for users that want to translate an arbitrary structure that doesn't implement <see cref="ITranslatable"/> (e.g. translating a complex collection)
/// </summary>
/// <param name="translator">the translator</param>
/// <param name="objectToTranslate">the object to translate</param>
internal delegate void ObjectTranslator<T>(ITranslator translator, ref T objectToTranslate);
/// <summary>
/// This delegate is used to create arbitrary collection types for serialization.
/// </summary>
/// <typeparam name="T">The type of dictionary to be created.</typeparam>
internal delegate T NodePacketCollectionCreator<T>(int capacity);
/// <summary>
/// The serialization mode.
/// </summary>
internal enum TranslationDirection
{
/// <summary>
/// Indicates the serializer is operating in write mode.
/// </summary>
WriteToStream,
/// <summary>
/// Indicates the serializer is operating in read mode.
/// </summary>
ReadFromStream
}
/// <summary>
/// This interface represents an object which aids objects in serializing and
/// deserializing INodePackets.
/// </summary>
/// <remarks>
/// The reason we bother with a custom serialization mechanism at all is two fold:
/// 1. The .Net serialization mechanism is inefficient, even if you implement ISerializable
/// with your own custom mechanism. This is because the serializer uses a bag called
/// SerializationInfo into which you are expected to drop all your data. This adds
/// an unnecessary level of indirection to the serialization routines and prevents direct,
/// efficient access to the byte-stream.
/// 2. You have to implement both a reader and writer part, which introduces the potential for
/// error should the classes be later modified. If the reader and writer methods are not
/// kept in perfect sync, serialization errors will occur. Our custom serializer eliminates
/// that by ensuring a single Translate method on a given object can handle both reads and
/// writes without referencing any field more than once.
/// </remarks>
internal interface ITranslator : IDisposable
{
/// <summary>
/// Returns the current serialization mode.
/// </summary>
TranslationDirection Mode
{
get;
}
/// <summary>
/// Returns the binary reader.
/// </summary>
/// <remarks>
/// This should ONLY be used when absolutely necessary for translation. It is generally unnecessary for the
/// translating object to know the direction of translation. Use one of the Translate methods instead.
/// </remarks>
BinaryReader Reader
{
get;
}
/// <summary>
/// Returns the binary writer.
/// </summary>
/// <remarks>
/// This should ONLY be used when absolutely necessary for translation. It is generally unnecessary for the
/// translating object to know the direction of translation. Use one of the Translate methods instead.
/// </remarks>
BinaryWriter Writer
{
get;
}
/// <summary>
/// Translates a boolean.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref bool value);
/// <summary>
/// Translates an <see langword="bool"/> array.
/// </summary>
/// <param name="array">The array to be translated.</param>
void Translate(ref bool[] array);
/// <summary>
/// Translates a byte.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref byte value);
/// <summary>
/// Translates a short.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref short value);
/// <summary>
/// Translates a unsigned short.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref ushort value);
/// <summary>
/// Translates an integer.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref int value);
/// <summary>
/// Translates an unsigned integer.
/// </summary>
/// <param name="unsignedInteger">The unsigned integer to translate.</param>
void Translate(ref uint unsignedInteger);
/// <summary>
/// Translates an <see langword="int"/> array.
/// </summary>
/// <param name="array">The array to be translated.</param>
void Translate(ref int[] array);
/// <summary>
/// Translates a long.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref long value);
/// <summary>
/// Translates a string.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref string value);
/// <summary>
/// Translates a double.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref double value);
/// <summary>
/// Translates a string array.
/// </summary>
/// <param name="array">The array to be translated.</param>
void Translate(ref string[] array);
/// <summary>
/// Translates a list of strings
/// </summary>
/// <param name="list">The list to be translated.</param>
void Translate(ref List<string> list);
/// <summary>
/// Translates a set of strings
/// </summary>
/// <param name="set">The set to be translated.</param>
void Translate(ref HashSet<string> set);
/// <summary>
/// Translates a list of T using an <see cref="ObjectTranslator{T}"/>
/// </summary>
/// <param name="list">The list to be translated.</param>
/// <param name="objectTranslator">The translator to use for the items in the list</param>
/// <typeparam name="T">A TaskItemType</typeparam>
void Translate<T>(ref List<T> list, ObjectTranslator<T> objectTranslator);
/// <summary>
/// Translates a list of T using an <see cref="ObjectTranslator{T}"/> anda collection factory
/// </summary>
/// <param name="list">The list to be translated.</param>
/// <param name="objectTranslator">The translator to use for the items in the list</param>
/// <typeparam name="T">An ITranslatable subtype</typeparam>
/// <typeparam name="L">An IList subtype</typeparam>
/// <param name="collectionFactory">factory to create a collection</param>
void Translate<T, L>(ref IList<T> list, ObjectTranslator<T> objectTranslator, NodePacketCollectionCreator<L> collectionFactory) where L : IList<T>;
/// <summary>
/// Translates a collection of T into the specified type using an <see cref="ObjectTranslator{T}"/> and <see cref="NodePacketCollectionCreator{L}"/>
/// </summary>
/// <param name="collection">The collection to be translated.</param>
/// <param name="objectTranslator">The translator to use for the values in the collection.</param>
/// <param name="collectionFactory">The factory to create the ICollection.</param>
/// <typeparam name="T">The type contained in the collection.</typeparam>
/// <typeparam name="L">The type of collection to be created.</typeparam>
void Translate<T, L>(ref ICollection<T> collection, ObjectTranslator<T> objectTranslator, NodePacketCollectionCreator<L> collectionFactory) where L : ICollection<T>;
/// <summary>
/// Translates a DateTime.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref DateTime value);
/// <summary>
/// Translates a TimeSpan.
/// </summary>
/// <param name="value">The value to be translated.</param>
void Translate(ref TimeSpan value);
// MSBuildTaskHost is based on CLR 3.5, which does not have the 6-parameter constructor for BuildEventContext,
// which is what current implementations of this method use. However, it also does not ever need to translate
// BuildEventContexts, so it should be perfectly safe to compile this method out of that assembly. I am compiling
// the method out of the interface as well, instead of just making the method empty, so that if we ever do need
// to translate BuildEventContexts from the CLR 3.5 task host, it will become immediately obvious, rather than
// failing or misbehaving silently.
#if !CLR2COMPATIBILITY
/// <summary>
/// Translates a BuildEventContext
/// </summary>
/// <remarks>
/// This method exists only because there is no serialization method built into the BuildEventContext
/// class, and it lives in Framework and we don't want to add a public method to it.
/// </remarks>
/// <param name="value">The context to be translated.</param>
void Translate(ref BuildEventContext value);
#endif
/// <summary>
/// Translates an enumeration.
/// </summary>
/// <typeparam name="T">The enumeration type.</typeparam>
/// <param name="value">The enumeration instance to be translated.</param>
/// <param name="numericValue">The enumeration value as an integer.</param>
/// <remarks>This is a bit ugly, but it doesn't seem like a nice method signature is possible because
/// you can't pass the enum type as a reference and constrain the generic parameter to Enum. Nor
/// can you simply pass as ref Enum, because an enum instance doesn't match that function signature.
/// Finally, converting the enum to an int assumes that we always want to transport enums as ints. This
/// works in all of our current cases, but certainly isn't perfectly generic.</remarks>
void TranslateEnum<T>(ref T value, int numericValue)
where T : struct, Enum;
/// <summary>
/// Translates a value using the .Net binary formatter.
/// </summary>
/// <typeparam name="T">The reference type.</typeparam>
/// <param name="value">The value to be translated.</param>
/// <remarks>
/// The primary purpose of this method is to support serialization of Exceptions and
/// custom build logging events, since these do not support our custom serialization
/// methods.
/// </remarks>
void TranslateDotNet<T>(ref T value);
void TranslateException(ref Exception value);
/// <summary>
/// Translates an object implementing INodePacketTranslatable.
/// </summary>
/// <typeparam name="T">The reference type.</typeparam>
/// <param name="value">The value to be translated.</param>
void Translate<T>(ref T value)
where T : ITranslatable, new();
/// <summary>
/// Translates a culture
/// </summary>
/// <param name="culture">The culture</param>
void TranslateCulture(ref CultureInfo culture);
/// <summary>
/// Translates a byte array
/// </summary>
/// <param name="byteArray">The array to be translated.</param>
void Translate(ref byte[] byteArray);
/// <summary>
/// Translates a byte array
/// </summary>
/// <param name="byteArray">The array to be translated.</param>
/// <param name="length">The length of array which will be used in translation</param>
void Translate(ref byte[] byteArray, ref int length);
/// <summary>
/// Translates an array of objects implementing INodePacketTranslatable.
/// </summary>
/// <typeparam name="T">The reference type.</typeparam>
/// <param name="array">The array to be translated.</param>
void TranslateArray<T>(ref T[] array)
where T : ITranslatable, new();
/// <summary>
/// Translates an array of objects using an <see cref="ObjectTranslator{T}"/>.
/// </summary>
/// <typeparam name="T">The reference type.</typeparam>
/// <param name="array">The array to be translated.</param>
/// <param name="objectTranslator">The translator to use for the elements in the array.</param>
void TranslateArray<T>(ref T[] array, ObjectTranslator<T> objectTranslator);
/// <summary>
/// Translates a dictionary of { string, string }.
/// </summary>
/// <param name="dictionary">The dictionary to be translated.</param>
/// <param name="comparer">The comparer used to instantiate the dictionary.</param>
void TranslateDictionary(ref Dictionary<string, string> dictionary, IEqualityComparer<string> comparer);
void TranslateDictionary(ref IDictionary<string, string> dictionary, NodePacketCollectionCreator<IDictionary<string, string>> collectionCreator);
void TranslateDictionary(ref Dictionary<string, DateTime> dictionary, StringComparer comparer);
void TranslateDictionary<K, V>(ref IDictionary<K, V> dictionary, ObjectTranslator<K> keyTranslator, ObjectTranslator<V> valueTranslator, NodePacketCollectionCreator<IDictionary<K, V>> dictionaryCreator);
/// <summary>
/// Translates a dictionary of { string, T }.
/// </summary>
/// <typeparam name="T">The reference type for the values, which implements INodePacketTranslatable.</typeparam>
/// <param name="dictionary">The dictionary to be translated.</param>
/// <param name="comparer">The comparer used to instantiate the dictionary.</param>
/// <param name="objectTranslator">The translator to use for the values in the dictionary</param>
void TranslateDictionary<T>(ref Dictionary<string, T> dictionary, IEqualityComparer<string> comparer, ObjectTranslator<T> objectTranslator)
where T : class;
/// <summary>
/// Translates a dictionary of { string, T } for dictionaries with public parameterless constructors.
/// </summary>
/// <typeparam name="D">The reference type for the dictionary.</typeparam>
/// <typeparam name="T">The reference type for values in the dictionary.</typeparam>
/// <param name="dictionary">The dictionary to be translated.</param>
/// <param name="objectTranslator">The translator to use for the values in the dictionary.</param>
void TranslateDictionary<D, T>(ref D dictionary, ObjectTranslator<T> objectTranslator)
where D : IDictionary<string, T>, new()
where T : class;
/// <summary>
/// Translates a dictionary of { string, T } for dictionaries with public parameterless constructors.
/// </summary>
/// <typeparam name="D">The reference type for the dictionary.</typeparam>
/// <typeparam name="T">The reference type for values in the dictionary.</typeparam>
/// <param name="dictionary">The dictionary to be translated.</param>
/// <param name="objectTranslator">The translator to use for the values in the dictionary</param>
/// <param name="collectionCreator">A factory used to create the dictionary.</param>
void TranslateDictionary<D, T>(ref D dictionary, ObjectTranslator<T> objectTranslator, NodePacketCollectionCreator<D> collectionCreator)
where D : IDictionary<string, T>
where T : class;
/// <summary>
/// Translates the boolean that says whether this value is null or not
/// </summary>
/// <param name="value">The object to test.</param>
/// <typeparam name="T">The type of object to test.</typeparam>
/// <returns>True if the object should be written, false otherwise.</returns>
bool TranslateNullable<T>(T value);
}
}
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