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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Concurrent;
using System.Collections.ObjectModel;
using System.Linq;
using System.Web.Http.Internal;
using System.Web.Http.ModelBinding;
namespace System.Web.Http.Controllers
{
public abstract class HttpParameterDescriptor
{
private readonly ConcurrentDictionary<object, object> _properties = new ConcurrentDictionary<object, object>();
private ModelBinderAttribute _modelBinderAttribute;
private bool _searchedModelBinderAttribute;
private HttpConfiguration _configuration;
private HttpActionDescriptor _actionDescriptor;
protected HttpParameterDescriptor()
{
}
protected HttpParameterDescriptor(HttpActionDescriptor actionDescriptor)
{
if (actionDescriptor == null)
{
throw Error.ArgumentNull("actionDescriptor");
}
_actionDescriptor = actionDescriptor;
_configuration = _actionDescriptor.Configuration;
}
public HttpConfiguration Configuration
{
get { return _configuration; }
set
{
if (value == null)
{
throw Error.PropertyNull();
}
_configuration = value;
}
}
public HttpActionDescriptor ActionDescriptor
{
get { return _actionDescriptor; }
set
{
if (value == null)
{
throw Error.PropertyNull();
}
_actionDescriptor = value;
}
}
/// <summary>
/// Gets the properties associated with this instance.
/// </summary>
public ConcurrentDictionary<object, object> Properties
{
get { return _properties; }
}
public virtual object DefaultValue
{
get { return null; }
}
public abstract string ParameterName { get; }
public abstract Type ParameterType { get; }
public virtual string Prefix
{
get
{
ModelBinderAttribute attribute = ModelBinderAttribute;
return attribute != null && !String.IsNullOrEmpty(attribute.Name)
? attribute.Name
: null;
}
}
public virtual ModelBinderAttribute ModelBinderAttribute
{
get
{
if (_modelBinderAttribute == null)
{
if (!_searchedModelBinderAttribute)
{
_searchedModelBinderAttribute = true;
_modelBinderAttribute = FindModelBinderAttribute();
}
}
return _modelBinderAttribute;
}
set { _modelBinderAttribute = value; }
}
public virtual Collection<T> GetCustomAttributes<T>() where T : class
{
return new Collection<T>();
}
private ModelBinderAttribute FindModelBinderAttribute()
{
// Can be on parameter itself or on the parameter's type. Nearest wins.
return GetCustomAttributes<ModelBinderAttribute>().SingleOrDefault()
?? ParameterType.GetCustomAttributes<ModelBinderAttribute>(false).SingleOrDefault();
}
}
}
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