tug/src/Tug.Base/Util/ReadOnlyConfiguration.cs at master · PowerShellOrg/tug · GitHub

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// PowerShell.org Tug DSC Pull Server

// Licensed under the MIT license. See the LICENSE file in the project root for more information.

using System;

using System.Collections.Generic;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.Primitives;

namespace Tug.Util

{

/// <summary>

/// A <see cref="IConfiguration">configuration</see> implementation

// that wraps another instance and prevents modifications to the wrapped instance.

/// </summary>

/// <remarks>

/// When wrapping another instance, you can optionally indicate whether write

/// attempts generate exceptions or are silently ignored.

/// <p>

/// Upon first access, nested configuration elements are themselves wrapped in read-only

/// implementations before being returned.

/// </p>

/// </remarks>

public class ReadOnlyConfiguration : IConfiguration

{

private IConfiguration _inner;

private bool _throwOnWrite;

private Dictionary<string, ReadOnlyConfigurationSection> _children;

/// <param name="throwOnWrite"><c>true</c> by default which indicates

/// exceptions will be thrown for any write attempts</param>

public ReadOnlyConfiguration(IConfiguration inner, bool throwOnWrite = true)

{

if (inner == null)

throw new ArgumentNullException(nameof(inner));

_inner = inner;

_throwOnWrite = throwOnWrite;

}

public string this[string key]

{

get { return _inner[key]; }

set

{

if (_throwOnWrite)

{

throw new InvalidOperationException(

/*SR*/"Attempt to write a read-only configuration");

}

public IConfigurationSection GetSection(string key)

{

var cs = _inner.GetSection(key);

return cs == null ? null : GetReadOnlySection(key);

}

public IEnumerable<IConfigurationSection> GetChildren()

{

foreach (var cs in _inner.GetChildren())

{

yield return GetReadOnlySection(cs.Key);

}

public IChangeToken GetReloadToken()

{

return _inner.GetReloadToken();

}

private ReadOnlyConfigurationSection GetReadOnlySection(string key)

{

if (_children == null)

_children = new Dictionary<string, ReadOnlyConfigurationSection>();

if (!_children.ContainsKey(key))

_children.Add(key, new ReadOnlyConfigurationSection(_inner.GetSection(key)));

return _children[key];

}

tug/src/Tug.Base/Util/ReadOnlyConfiguration.cs at master · PowerShellOrg/tug · GitHub

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