/// <summary>
/// Gets a tag of a specified type from the current instance,
/// optionally creating a new tag if possible.
/// </summary>
/// <param name="type">
/// A <see cref="TagLib.TagTypes" /> value indicating the
/// type of tag to read.
/// </param>
/// <param name="create">
/// A <see cref="bool" /> value specifying whether or not to
/// try and create the tag if one is not found.
/// </param>
/// <returns>
/// A <see cref="Tag" /> object containing the tag that was
/// found in or added to the current instance. If no
/// matching tag was found and none was created, <see
/// langword="null" /> is returned.
/// </returns>
public override TagLib.Tag GetTag(TagLib.TagTypes type,
bool create)
{
foreach (Tag tag in ImageTag.AllTags)
{
if ((tag.TagTypes & type) == type)
{
return(tag);
}
}
if (!create || (type & ImageTag.AllowedTypes) == 0)
{
return(null);
}
ImageTag new_tag = null;
switch (type)
{
case TagTypes.JpegComment:
new_tag = new JpegCommentTag();
break;
case TagTypes.GifComment:
new_tag = new GifCommentTag();
break;
case TagTypes.Png:
new_tag = new PngTag();
break;
case TagTypes.TiffIFD:
new_tag = new IFDTag();
break;
case TagTypes.XMP:
new_tag = new XmpTag();
break;
}
if (new_tag != null)
{
ImageTag.AddTag(new_tag);
return(new_tag);
}
throw new NotImplementedException(String.Format("Adding tag of type {0} not supported!", type));
}
public void TestJpegRead()
{
Assert.IsTrue(_file is Jpeg.File);
Assert.AreEqual(CONTAINED_TYPES, _file.TagTypes);
Assert.AreEqual(CONTAINED_TYPES, _file.TagTypesOnDisk);
Assert.IsNotNull(_file.Properties, "properties");
Assert.AreEqual(7, _file.Properties.PhotoHeight);
Assert.AreEqual(10, _file.Properties.PhotoWidth);
Assert.AreEqual(90, _file.Properties.PhotoQuality);
JpegCommentTag tag = _file.GetTag(TagTypes.JpegComment) as JpegCommentTag;
Assert.IsFalse(tag == null);
Assert.AreEqual("Test Comment", tag.Value);
}
