public Task SetMetaData(string fileName, IEnumerable <MetaDataItem> metaDataItems, Func <MetaDataItem, bool> predicate)
{
var box = this.GetXtraBox();
var tags = metaDataItems.Where(
metaDataItem => XtraTag.CanExport(metaDataItem)
).Select(
metaDataItem => XtraTag.FromMetaDataItem(metaDataItem)
).ToArray();
if (box == null)
{
this.AddTags(tags);
}
else if (tags.Any())
{
this.UpdateTags(box, tags);
}
else
{
this.RemoveXtraBox();
}
#if NET40
return(TaskEx.FromResult(false));
#else
return(Task.CompletedTask);
#endif
}
protected virtual void OnFormat(BinaryWriter writer, XtraTag tag)
{
var frameLength = default(int);
var nameLength = default(int);
var name = tag.Name;
var count = tag.Parts.Length;
var contentLength = default(int);
contentLength = tag.Parts.Sum(part => 4 + 2 + part.Content.Length);
nameLength = name.Length;
frameLength = 4 + 4 + nameLength + 4 + contentLength;
WriteInt32(writer, frameLength);
WriteInt32(writer, nameLength);
WriteString(writer, name);
WriteInt32(writer, count);
foreach (var part in tag.Parts)
{
var flag = default(short);
var content = part.Content;
var elementLength = 4 + 2 + content.Length;
switch (part.Type)
{
case XtraTagType.Unicode:
flag = XtraBox.UNICODE;
break;
case XtraTagType.UInt64:
flag = XtraBox.UINT64;
break;
case XtraTagType.Date:
flag = XtraBox.DATE;
break;
case XtraTagType.Guid:
flag = XtraBox.GUID;
break;
case XtraTagType.Variant:
flag = XtraBox.VARIANT;
break;
default:
throw new NotImplementedException();
}
WriteInt32(writer, elementLength);
WriteInt16(writer, flag);
writer.Write(content);
}
}
public Task <IEnumerable <MetaDataItem> > GetMetaData(string fileName)
{
var box = this.GetXtraBox();
var metaDatas = new List <MetaDataItem>();
if (box != null && box.Data != null)
{
var parser = new XtraBoxParser(box.Data.Data);
var metaDataItems = parser.Tags.Where(
tag => XtraTag.CanImport(tag)
).Select(
tag => tag.ToMetaDataItem()
).ToArray();
metaDatas.AddRange(metaDataItems);
}
#if NET40
return(TaskEx.FromResult <IEnumerable <MetaDataItem> >(metaDatas));
#else
return(Task.FromResult <IEnumerable <MetaDataItem> >(metaDatas));
#endif
}
