private TAttribute RetrieveAttribute <TAttribute>(PairKey <Type, Type> key, bool inherit)
where TAttribute : Attribute
{
TAttribute attribute = (TAttribute)Attribute.GetCustomAttribute(key.Left, typeof(TAttribute), inherit);
return(attribute);
}
public override bool Equals(object obj)
{
PairKey <TLeft, TRight> other = obj as PairKey <TLeft, TRight>;
if (other == null)
{
return(false);
}
return(Equals(left, other.left) && Equals(right, other.right));
}
private TAttribute DoGetCustomAttribute <TAttribute>(Type type, Dictionary <PairKey <Type, Type>, Attribute> cache, object lockObject, bool inherit)
where TAttribute : Attribute
{
PairKey <Type, Type> key = new PairKey <Type, Type>(type, typeof(TAttribute));
Attribute storedObject;
bool exists = false;
lock (lockObject)
{
exists = cache.TryGetValue(key, out storedObject);
}
if (!exists)
{
storedObject = RetrieveAttribute <TAttribute>(key, inherit);
lock (lockObject)
{
cache[key] = storedObject;
}
}
return(storedObject as TAttribute);
}
/// <summary>
/// Returns true if there is a cached entry for the attribute type for the given type
/// </summary>
/// <remarks>
/// A null cached entry will return true.
/// </remarks>
/// <typeparam name="TAttribute">The type of attribute required.</typeparam>
/// <param name="type">The type to query for the attribute.</param>
/// <returns><code>true</code> if the result for the attribute query is in the cache.</returns>
public bool HasCachedCustomAttribute <TAttribute>(Type type)
{
PairKey <Type, Type> key = new PairKey <Type, Type>(type, typeof(TAttribute));
return(this.typeAttributes.ContainsKey(key));
}