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Posted to users@jena.apache.org by Martynas Jusevičius <ma...@graphity.org> on 2013/11/14 03:02:34 UTC

Building xsd:dateTime from xsd:gYear + xsd:gMonth + xsd:gDay

Hey,

I have datetime components as 3 separate literals, with xsd:gYear,
xsd:gMonth, xsd:gDay respective datatypes. Not all mandatory - the
format can be YYYY, YYYY-MM, YYYY-MM-DD.

Now how do I combine those into a single xsd:dateTime Literal? A
concrete use case would be converting time:inDateTime values into
time:inXSDDateTime values:
http://www.w3.org/TR/owl-time/#calclock

I came up with the code below which seems to work but is not pretty
(and doesn't deal with time). I also looked at DateTimeStruct but
either way there seemed to be some datatype mismatch. I think it would
make more sense for DateTimeStruct to use the builder pattern instead
of static methods.

Is there a better way?

        if (resource.hasProperty(ResourceFactory.createProperty("http://www.w3.org/2006/time#inDateTime")))
        {
            Calendar calendar = Calendar.getInstance();
            Resource dateTimeDesc =
resource.getPropertyResourceValue(ResourceFactory.createProperty("http://www.w3.org/2006/time#inDateTime"));

            if (dateTimeDesc.hasProperty(ResourceFactory.createProperty("http://www.w3.org/2006/time#year")))
            {
                RDFNode object =
dateTimeDesc.getProperty(ResourceFactory.createProperty("http://www.w3.org/2006/time#year")).getObject();
                if (object.isLiteral())
                {
                    Literal literal = object.asLiteral();
                    calendar.set(Calendar.YEAR,
Integer.parseInt(literal.getLexicalForm()));
                }
            }
            else throw new DateTimeParseException("time:year value is missing");

            if (dateTimeDesc.hasProperty(ResourceFactory.createProperty("http://www.w3.org/2006/time#month")))
            {
                RDFNode object =
dateTimeDesc.getProperty(ResourceFactory.createProperty("http://www.w3.org/2006/time#month")).getObject();
                if (object.isLiteral())
                {
                    Literal literal = object.asLiteral();
                    calendar.set(Calendar.MONTH,
Integer.parseInt(literal.getLexicalForm()));
                }
            }

            if (dateTimeDesc.hasProperty(ResourceFactory.createProperty("http://www.w3.org/2006/time#day")))
            {
                RDFNode object =
dateTimeDesc.getProperty(ResourceFactory.createProperty("http://www.w3.org/2006/time#day")).getObject();
                if (object.isLiteral())
                {
                    Literal literal = object.asLiteral();
                    calendar.set(Calendar.DAY_OF_MONTH,
Integer.parseInt(literal.getLexicalForm()));
                }
            }

            calendar.set(Calendar.HOUR, 0);
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.SECOND, 0);
            Literal dateTime = resource.getModel().createTypedLiteral(calendar);
            resource.addLiteral(ResourceFactory.createProperty("http://www.w3.org/2006/time#inXSDDateTime"),
dateTime);
        }

Martynas
graphityhq.com