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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System.Collections.Generic;
namespace Microsoft.Extensions.Options
{
/// <summary>
/// Implementation of IOptionsFactory.
/// </summary>
/// <typeparam name="TOptions">The type of options being requested.</typeparam>
public class OptionsFactory<TOptions> : IOptionsFactory<TOptions> where TOptions : class, new()
{
private readonly IEnumerable<IConfigureOptions<TOptions>> _setups;
private readonly IEnumerable<IPostConfigureOptions<TOptions>> _postConfigures;
private readonly IEnumerable<IValidateOptions<TOptions>> _validations;
/// <summary>
/// Initializes a new instance with the specified options configurations.
/// </summary>
/// <param name="setups">The configuration actions to run.</param>
/// <param name="postConfigures">The initialization actions to run.</param>
public OptionsFactory(IEnumerable<IConfigureOptions<TOptions>> setups, IEnumerable<IPostConfigureOptions<TOptions>> postConfigures) : this(setups, postConfigures, validations: null)
{ }
/// <summary>
/// Initializes a new instance with the specified options configurations.
/// </summary>
/// <param name="setups">The configuration actions to run.</param>
/// <param name="postConfigures">The initialization actions to run.</param>
/// <param name="validations">The validations to run.</param>
public OptionsFactory(IEnumerable<IConfigureOptions<TOptions>> setups, IEnumerable<IPostConfigureOptions<TOptions>> postConfigures, IEnumerable<IValidateOptions<TOptions>> validations)
{
_setups = setups;
_postConfigures = postConfigures;
_validations = validations;
}
/// <summary>
/// Returns a configured TOptions instance with the given name.
/// </summary>
public TOptions Create(string name)
{
var options = new TOptions();
foreach (var setup in _setups)
{
if (setup is IConfigureNamedOptions<TOptions> namedSetup)
{
namedSetup.Configure(name, options);
}
else if (name == Options.DefaultName)
{
setup.Configure(options);
}
}
foreach (var post in _postConfigures)
{
post.PostConfigure(name, options);
}
if (_validations != null)
{
var failures = new List<string>();
foreach (var validate in _validations)
{
var result = validate.Validate(name, options);
if (result.Failed)
{
failures.Add(result.FailureMessage);
}
}
if (failures.Count > 0)
{
throw new OptionsValidationException(name, typeof(TOptions), failures);
}
}
return options;
}
}
}