Given a startTime
(dateTime), endTime (dateTime) and intervals (integer), I'm attempting to come
up with dateTimes evenly spaced between the startTime and endTime. It
seems that I need to use xquery-operators to do this since XSLT doesn't seem to
provide the kind of date manipulation I need. When I try to run this, I
get an error (also below).
Am I going about
this the correct way, or is there a better way to do this? Does JDOM
provide support for xquery-operators in XSLT? If not, is there another way
to get these time intervals? Or should I be using another processor for
this? On a slightly related node, position() works, but fn:position()
doesn't. Is this a XSLT 1.0 vs 2.0 thing?
Thanks,
Charles
<-------------ERROR---------------->
ERROR: 'The
first argument to the non-static Java function 'subtractDateTimes' is not a
valid object reference.'
FATAL ERROR: 'Could not compile
stylesheet'
org.jdom.transform.XSLTransformException: Could not construct
XSLTransformer: Could not compile stylesheet
<--------------------STYLESHEET---------------------------->
<xsl:variable
name="startTime" select="sgp4:SGP4Set/sgp4:startDateTime"
/>
<xsl:variable name="endTime"
select="sgp4:SGP4Set/sgp4:stopDateTime" />
<xsl:variable
name="steps" select="sgp4:SGP4Set/sgp4:steps"
/>
<xsl:template
match="/">
<result>
<xsl:apply-templates
/>
</result>
</xsl:template>
<xsl:template
match="sgp4:timeSeries">
<xsl:apply-templates/>
</xsl:template>
<xsl:template
match="sgp4:SGP4Set/sgp4:timeSeries/sgp4:latLonXYZ">
<timeLocation>
<xsl:value-of
select="$startTime + (position() * (op:subtract-dateTimes($startTime, $endTime)
div
steps))"/>
</timeLocation>
</xsl:template>
</xsl:stylesheet>
<------------------------------CODE-------------------------------->
I'm then trying to
transform it with the following code:
String
str = "<SGP4Set>" +
"<startDateTime>2007-06-14T15:21:10.666+00:00</startDateTime>" +
"<stopDateTime>2007-06-15T15:21:10.666+00:00</stopDateTime>" +
"<steps>3</steps>" +
"<elsetLine1>1
25544U 98067A 07164.33827071 -.00073317 00000-0 -41936-3
0 3835</elsetLine1>" +
"<elsetLine2>2 25544
051.6334 123.8003 0008065 317.7457 198.0340
15.78097880490162</elsetLine2>" +
"<timeSeries>" +
"<latLonXYZ lat=\"-4.464837391096287\"
lon=\"340.6854284795686\" height=\"333.1668901789984\" x=\"-2673.3476456175044\"
y=\"6133.803881468676\" z=\"-519.1427930784305\"
time=\"1874.1666666665114\"/>" +
"<latLonXYZ
lat=\"4.510324008580091\" lon=\"347.0371991370784\"
height=\"332.65914429961356\" x=\"-3407.888183523746\" y=\"5757.110331891201\"
z=\"524.3810905059737\" time=\"1877.0466666665116\"/>" +
"<latLonXYZ lat=\"13.413484560305426\"
lon=\"353.56508317710467\" height=\"333.1856535368585\" x=\"-4008.464009082425\"
y=\"5154.103666587921\" z=\"1547.231195854609\"
time=\"1879.9266666665117\"/>" +
"</timeSeries>"
+
"</SGP4Set>";
//
setup our transformer
SAXBuilder builder = new
SAXBuilder();
XSLTransformer transformer = new
XSLTransformer("SGP4ToKML.xslt");
//
setup our document to transform
StringReader sr = new
StringReader(str);
Document doc =
builder.build(sr);
// save the
transformed document in doc2
Document doc2 =
transformer.transform(doc);
String result = new
XMLOutputter().outputString(doc);
result
= new
XMLOutputter().outputString(doc2);
XmlObject
obj =
XmlObject.Factory.parse(result);
System.out.println(obj);
