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namespace System.Web.DynamicData.Util {
using System;
using System.Collections.Generic;
using System.Linq;
internal static class AttributeExtensions {
/// <summary>
/// Gets the first attribute of a given time on the target AttributeCollection, or null.
/// </summary>
/// <typeparam name="TAttribute">The attribute type</typeparam>
/// <param name="attributes">The AttributeCollection object</param>
/// <returns></returns>
internal static TAttribute FirstOrDefault<TAttribute>(this System.ComponentModel.AttributeCollection attributes) where TAttribute : Attribute {
return attributes.OfType<TAttribute>().FirstOrDefault();
}
internal static TResult GetAttributePropertyValue<TAttribute, TResult>(this System.ComponentModel.AttributeCollection attributes, Func<TAttribute, TResult> propertyGetter)
where TResult : class
where TAttribute : Attribute {
return attributes.GetAttributePropertyValue(propertyGetter, null);
}
internal static TResult GetAttributePropertyValue<TAttribute, TResult>(this System.ComponentModel.AttributeCollection attributes, Func<TAttribute, TResult> propertyGetter, TResult defaultValue)
where TAttribute : Attribute {
var attribute = attributes.FirstOrDefault<TAttribute>();
return attribute.GetPropertyValue<TAttribute, TResult>(propertyGetter, defaultValue);
}
/// <summary>
/// Gets the property for a given attribute reference or returns null if the reference is null.
/// </summary>
/// <typeparam name="TAttribute">The attribute type</typeparam>
/// <typeparam name="TResult">The type of the attribute's property</typeparam>
/// <param name="attribute">The attribute reference</param>
/// <param name="propertyGetter">The function to evaluate on the attribute</param>
/// <returns></returns>
internal static TResult GetPropertyValue<TAttribute, TResult>(this TAttribute attribute, Func<TAttribute, TResult> propertyGetter)
where TResult : class
where TAttribute : Attribute {
return attribute.GetPropertyValue(propertyGetter, null);
}
/// <summary>
/// Gets the property for a given attribute reference or returns the default value if the reference is null.
/// </summary>
/// <typeparam name="TAttribute">The attribute type</typeparam>
/// <typeparam name="TResult">The type of the attribute's property</typeparam>
/// <param name="attribute">The attribute reference</param>
/// <param name="propertyGetter">The function to evaluate on the attribute</param>
/// <param name="defaultValue">The default value to return if the attribute is null</param>
/// <returns></returns>
internal static TResult GetPropertyValue<TAttribute, TResult>(this TAttribute attribute, Func<TAttribute, TResult> propertyGetter, TResult defaultValue)
where TAttribute : Attribute {
if (attribute != null) {
return propertyGetter(attribute);
}
else {
return defaultValue;
}
}
}
}
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