/// <summary>
/// adds <paramref name="data"/> to <paramref name="info"/>.
/// if <paramref name="info"/> already has a meta data of the same type, it will be replaced.
/// if <paramref name="data"/> is null, any item of type MetaDataType or null will be removed.
/// </summary>
public static void SetMetaData <MetaDataType>(this IInfoExtended info, MetaDataType data)
where MetaDataType : class, ICloneable
{
if (info.MetaData == null)
{
RemoveMetaData <MetaDataType>(info);
return;
}
if (info.MetaData == null)
{
info.MetaData = new List <ICloneable>();
}
var list = info.MetaData;
for (int i = 0; i < info.MetaData.Count; ++i)
{
if (list[i] is MetaDataType)
{
list[i] = data;
return;
}
}
list.Add(data);
}
/// <summary>
/// removes any item of type MetaDataType or null from <paramref name="info"/>
/// </summary>
public static void RemoveMetaData <MetaDataType>(this IInfoExtended info)
where MetaDataType : class, ICloneable
{
if (info.MetaData == null)
{
return;
}
bool predicate(ICloneable _m) => !(_m is null || _m is MetaDataType);
info.MetaData = info.MetaData.Where(predicate).ToList();
}
public static MetaDataType GetMetaData <MetaDataType>(this IInfoExtended info)
where MetaDataType : class
{
if (info.MetaData != null)
{
foreach (var item in info.MetaData)
{
if (item is MetaDataType ret)
{
return(ret);
}
}
}
return(null);
}