Hi,
in my target schema I have this attribute:
<xs:element name="positionAccuracyVector"
type="csn:PositionAccuracyVectorType" minOccurs="0"/>
<xs:complexType name="PositionAccuracyVectorType">
<xs:sequence>
<xs:element name="x" type="xs:integer">
</xs:element>
<xs:element name="y" type="xs:integer">
</xs:element>
</xs:sequence>
</xs:complexType>
As you can see the attribute is optional, but the x/y inside of it are not.
I made the following mappings (no feature chaining):
<AttributeMapping>
<targetAttribute>
csndc:positionAccuracyVector/x
</targetAttribute>
<sourceExpression>
<OCQL>position_accuracy_x</OCQL>
</sourceExpression>
</AttributeMapping>
<AttributeMapping>
<targetAttribute>
csndc:positionAccuracyVector/y
</targetAttribute>
<sourceExpression>
<OCQL>position_accuracy_y</OCQL>
</sourceExpression>
</AttributeMapping>
But the database contains also nulls for the two attributes. I hoped the
app-schema store was smart enough to see all the attributes were null
and decide not to create the positionAccuracy attribute, but unfortunately
that did not work and I get the following exception:
org.geotools.feature.IllegalAttributeException:http://www.w3.org/2001/XMLSchema:integer
not nillable:null value:null
at org.geotools.feature.type.Types.validate(Types.java:112)
at org.geotools.feature.type.Types.validate(Types.java:80)
at org.geotools.feature.AttributeImpl.<init>(AttributeImpl.java:51)
at
org.geotools.feature.AppSchemaFeatureFactoryImpl.createAttribute(AppSchemaFeatureFactoryImpl.java:63)
at
org.geotools.feature.AttributeBuilder.create(AttributeBuilder.java:583)
at org.geotools.feature.AttributeBuilder.add(AttributeBuilder.java:495)
at org.geotools.data.complex.filter.XPath.setValue(XPath.java:769)
Looking at the docs and the AppSchemaDataAccess.xsd grammar I see no
way to tell
the app schema store whether a attribute is actually present or not.
Am I missing some feature, is this a bug or... what? :-)
Maybe feature chaining can be used to solve this riddle, but I'm
trying to avoid it like a plague,
I cannot have n queries made for each feature returned.
I guess this might be yet another candidate for xslt-ing...
Cheers
Andrea
-----------------------------------------------------
Ing. Andrea Aime
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584962313
fax: +39 0584962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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