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

[Andy Seaborne]

Hi there,

DateTimeStruct is, well, a struct. The fields are public.  You could 
write a builder to target that.  The default constructor could be made 
public.  The statics are specific patterns for the XSD date/time 
datatypes with validation.

DateTimeStruct represents the Date/time Seven-property model of XSD.  It 
can produce the string for xsd:date or xsd:dateTime but not the 
gregorial g* datatypes.

java.util.calendar is OK as a value but, in the details, unusable for 
XSD types.  Why not set DateTimeStruct fields?

javax.xml.datatype.XMLGregorianCalendar could be of use - it has getters 
and setters.

For DateTimeStruct or XMLGregorianCalendar, you can then use

createTypedLiteral(String lex, RDFDatatype dtype)

> Not all mandatory - the
> format can be YYYY, YYYY-MM, YYYY-MM-DD.

You could build the lexical form.

        Andy

On 14/11/13 02:02, Martynas Jusevičius wrote:
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