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public errordomain MetadataDateTimeError {
INVALID_FORMAT,
UNSUPPORTED_FORMAT
}
public class MetadataDateTime {
private DateTime timestamp;
private static TimeZone local = new TimeZone.local();
public MetadataDateTime(DateTime timestamp) {
this.timestamp = timestamp;
}
public MetadataDateTime.from_exif(string label) throws MetadataDateTimeError {
if (!from_exif_date_time(label, out timestamp))
throw new MetadataDateTimeError.INVALID_FORMAT("%s is not EXIF format date/time", label);
}
public MetadataDateTime.from_iptc(string date, string time) throws MetadataDateTimeError {
// TODO: Support IPTC date/time format
throw new MetadataDateTimeError.UNSUPPORTED_FORMAT("IPTC date/time format not currently supported");
}
public MetadataDateTime.from_xmp(string label) throws MetadataDateTimeError {
var dt = new DateTime.from_iso8601(label, null);
if (dt == null)
throw new MetadataDateTimeError.INVALID_FORMAT("%s is not XMP format date/time", label);
timestamp = dt;
}
public DateTime? get_timestamp() {
return timestamp;
}
public string get_exif_label() {
return to_exif_date_time(timestamp);
}
// TODO: get_iptc_date() and get_iptc_time()
public string get_xmp_label() {
return timestamp.format_iso8601();
}
public static bool from_exif_date_time(string date_time, out DateTime? timestamp) {
timestamp = null;
Time tm = Time();
// Check standard EXIF format
if (date_time.scanf("%d:%d:%d %d:%d:%d",
&tm.year, &tm.month, &tm.day, &tm.hour, &tm.minute, &tm.second) != 6) {
// Fallback in a more generic format
string tmp = date_time.dup();
tmp.canon("0123456789", ' ');
if (tmp.scanf("%4d%2d%2d%2d%2d%2d",
&tm.year, &tm.month, &tm.day, &tm.hour, &tm.minute,&tm.second) != 6)
return false;
}
// watch for bogosity
if (tm.year <= 1900 || tm.month <= 0 || tm.day < 0 || tm.hour < 0 || tm.minute < 0 || tm.second < 0)
return false;
timestamp = new DateTime(local, tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
return true;
}
public static string to_exif_date_time(DateTime timestamp) {
return timestamp.to_local().format("%Y:%m:%d %H:%M:%S");
}
public string to_string() {
return to_exif_date_time(timestamp);
}
}
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