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//-----------------------------------------------------------------------
// <copyright file="ValueMapping.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.Messaging.Reflection {
using System;
using System.Diagnostics.Contracts;
/// <summary>
/// A pair of conversion functions to map some type to a string and back again.
/// </summary>
[ContractVerification(true)]
internal struct ValueMapping {
/// <summary>
/// The mapping function that converts some custom type to a string.
/// </summary>
internal readonly Func<object, string> ValueToString;
/// <summary>
/// The mapping function that converts some custom type to the original string
/// (possibly non-normalized) that represents it.
/// </summary>
internal readonly Func<object, string> ValueToOriginalString;
/// <summary>
/// The mapping function that converts a string to some custom type.
/// </summary>
internal readonly Func<string, object> StringToValue;
/// <summary>
/// Initializes a new instance of the <see cref="ValueMapping"/> struct.
/// </summary>
/// <param name="toString">The mapping function that converts some custom value to a string.</param>
/// <param name="toOriginalString">The mapping function that converts some custom value to its original (non-normalized) string. May be null if the same as the <paramref name="toString"/> function.</param>
/// <param name="toValue">The mapping function that converts a string to some custom value.</param>
internal ValueMapping(Func<object, string> toString, Func<object, string> toOriginalString, Func<string, object> toValue) {
Requires.NotNull(toString, "toString");
Requires.NotNull(toValue, "toValue");
this.ValueToString = toString;
this.ValueToOriginalString = toOriginalString ?? toString;
this.StringToValue = toValue;
}
/// <summary>
/// Initializes a new instance of the <see cref="ValueMapping"/> struct.
/// </summary>
/// <param name="encoder">The encoder.</param>
internal ValueMapping(IMessagePartEncoder encoder) {
Requires.NotNull(encoder, "encoder");
var nullEncoder = encoder as IMessagePartNullEncoder;
string nullString = nullEncoder != null ? nullEncoder.EncodedNullValue : null;
var originalStringEncoder = encoder as IMessagePartOriginalEncoder;
Func<object, string> originalStringEncode = encoder.Encode;
if (originalStringEncoder != null) {
originalStringEncode = originalStringEncoder.EncodeAsOriginalString;
}
this.ValueToString = obj => (obj != null) ? encoder.Encode(obj) : nullString;
this.StringToValue = str => (str != null) ? encoder.Decode(str) : null;
this.ValueToOriginalString = obj => (obj != null) ? originalStringEncode(obj) : nullString;
}
}
}
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