public String getFieldValue(final TagInfoGpsText tag, final boolean mustExist) throws ImagingException {
        final TiffField field = findField(tag);
        if (field == null) {
            if (mustExist) {
                throw new ImagingException("Required field \"" + tag.name + "\" is missing");
            }
            return null;
        }
        return tag.getValue(field);
    }
Gets the byte order used by the source file for storing this directory and its content.

@return A valid byte order instance.
src/main/java/org/apache/commons/imaging/formats/tiff/TiffDirectory.java