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//-----------------------------------------------------------------------
// <copyright file="SuggestedStringsConverter.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.ComponentModel {
using System;
using System.Collections;
using System.ComponentModel.Design.Serialization;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Reflection;
/// <summary>
/// A type that generates suggested strings for Intellisense,
/// but doesn't actually convert between strings and other types.
/// </summary>
[ContractClass(typeof(SuggestedStringsConverterContract))]
public abstract class SuggestedStringsConverter : ConverterBase<string> {
/// <summary>
/// Initializes a new instance of the <see cref="SuggestedStringsConverter"/> class.
/// </summary>
protected SuggestedStringsConverter() {
}
/// <summary>
/// Gets the type to reflect over for the well known values.
/// </summary>
[Pure]
protected abstract Type WellKnownValuesType { get; }
/// <summary>
/// Gets the values of public static fields and properties on a given type.
/// </summary>
/// <param name="type">The type to reflect over.</param>
/// <returns>A collection of values.</returns>
internal static ICollection GetStandardValuesForCacheShared(Type type) {
Requires.NotNull(type, "type");
Contract.Ensures(Contract.Result<ICollection>() != null);
var fields = from field in type.GetFields(BindingFlags.Static | BindingFlags.Public)
select field.GetValue(null);
var properties = from prop in type.GetProperties(BindingFlags.Static | BindingFlags.Public)
select prop.GetValue(null, null);
return fields.Concat(properties).ToArray();
}
/// <summary>
/// Converts a value from its string representation to its strongly-typed object.
/// </summary>
/// <param name="value">The value.</param>
/// <returns>The strongly-typed object.</returns>
[Pure]
protected override string ConvertFrom(string value) {
return value;
}
/// <summary>
/// Creates the reflection instructions for recreating an instance later.
/// </summary>
/// <param name="value">The value to recreate later.</param>
/// <returns>
/// The description of how to recreate an instance.
/// </returns>
[Pure]
protected override InstanceDescriptor CreateFrom(string value) {
// No implementation necessary since we're only dealing with strings.
throw new NotImplementedException();
}
/// <summary>
/// Converts the strongly-typed value to a string.
/// </summary>
/// <param name="value">The value to convert.</param>
/// <returns>The string representation of the object.</returns>
[Pure]
protected override string ConvertToString(string value) {
return value;
}
/// <summary>
/// Gets the standard values to suggest with Intellisense in the designer.
/// </summary>
/// <returns>A collection of the standard values.</returns>
[Pure]
protected override ICollection GetStandardValuesForCache() {
return GetStandardValuesForCacheShared(this.WellKnownValuesType);
}
}
}
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