At the moment the way things are implemented i don't believe it is possible.
But i think we have come up against this issue before. It is basically the
same thing rob a wanted to do in that the jts geometry types are not
sufficient to represent types such as this.
But in this case the binding framework is walking up the type hierarchy,
finding the gml:Point type and executing. The solution I thought of before
but had no time to implement was to instead of blindly executing the
gml:Point binding, instead checking the type declared by that binding. In
this case the binding would determine that the incoming object is indeed not
a point, and skip the binding and continue to the parent.
And then at the top level we have a binding (that i think may already exist)
that can generically encode properties of a ComplexAttribute.
-Justin
On Thu, Sep 9, 2010 at 4:25 AM, Ben Caradoc-Davies
<[email protected]> wrote:
> Sorry, I don't think this is going to work with the current GeoTools
> implementation. The problem is that all geometry types are bound in Java to
> JTS geometry types (implementations of com.vividsolutions.jts.geom.Geometry)
> so that they can be used in spatial operations and encoded to GML. When you
> define a new complex type derived from gml:Point you create a type that is
> represented by a GeoTools ComplexAttributeImpl, which is not a
> com.vividsolutions.jts.geom.Geometry, and so anything expecting a Geometry
> will choke on it. Furthermore, GeoTools treats all geometries as simple
> (non-complex) attributes: they are an atomic data type like xs:double. This
> approach allows GML geometries to be converted to Java objects for spatial
> operations.
>
> This problem is an issue in the core GeoTools code. The app-schema plugin
> just allows you to run into the problem.
>
> Justin, can an application schema extension of a GML geometry such as
> gml:Point be accommodated within the GeoTools declared-type binding
> framework?
>
> Kind regards,
> Ben.
>
>
>
> On 09/09/10 03:30, Volker Grabsch wrote:
>
>> Hi App-Schema experts,
>>
>> I'm trying to map a PostGIS table with columns
>>
>> ...
>> point GEOMETRY NOT NULL,
>> height INTEGER NOT NULL,
>> height_uom TEXT NOT NULL
>>
>> to the following XML structure:
>>
>> <myns:MyFeature gml:id="...">
>> <myns:myPoint>
>> <myns:MyPoint gml:id="..." srsName="
>> http://www.opengis.net/gml/srs/epsg.xml#4326";>
>> <gml:pos>10.4721897381 43.2874901353</gml:pos>
>> <myns:height uom="FT">3</myns:height>
>> </myns:MyPoint>
>> </myns:myPoint>
>> </myns:MyFeature>
>>
>> That is, the type of myns:MyPoint is an extension of gml:Point with
>> an additional element. The corresponding part of the XML schema is:
>>
>> <complexType name="MyPointType">
>> <complexContent>
>> <extension base="gml:PointType">
>> <sequence>
>> <element name="height" type="gml:MeasureType"/>
>> </sequence>
>> </extension>
>> </complexContent>
>> </complexType>
>>
>> I've tried lots of variants of the following mapping:
>>
>> <AttributeMapping>
>> <targetAttribute>myns:myPoint</targetAttribute>
>> <sourceExpression>
>> <OCQL>point</OCQL>
>> </sourceExpression>
>> </AttributeMapping>
>> <AttributeMapping>
>>
>> <targetAttribute>myns:myPoint/myns:MyPoint/myns:height</targetAttribute>
>> <sourceExpression>
>> <OCQL>height</OCQL>
>> </sourceExpression>
>> <ClientProperty>
>> <name>uom</name>
>> <value>height_uom</value>
>> </ClientProperty>
>> </AttributeMapping>
>>
>> But I always got the following exception:
>>
>> java.lang.RuntimeException: Failed to get property: gid
>> Failed to get property: gid
>> org.geotools.feature.ComplexAttributeImpl cannot be cast to
>> com.vividsolutions.jts.geom.Geometry
>> ... [1]
>>
>> Note that the "gid" attribute is optional and even deprecated!
>> Nevertheless, I added it via the following mapping rule:
>>
>> <AttributeMapping>
>> <targetAttribute>myns:myPoint/myns:MyPoint</targetAttribute>
>> <ClientProperty>
>> <name>gid</name>
>> <value>'DUMMY'</value>
>> </ClientProperty>
>> </AttributeMapping>
>>
>> Then, I got the same error message regarding many other optional(!)
>> attributes. After providing dummy mappings for them, GeoServer finally
>> produced an output, but that output didn't contain the geometry data:
>>
>> <myns:MyFeature gml:id="...">
>> <myns:myPoint>
>> <myns:MyPoint axisLabels="DUMMY" gid="DUMMY" gml:id="DUMMY"
>> srsDimension="DUMMY" srsName="DUMMY" uomLabels="DUMMY">
>> <myns:height uom="FT">3</myns:height>
>> </myns:MyPoint>
>> </myns:myPoint>
>> </myns:MyFeature>
>>
>> I also tried to map the geometry to the MyPoint sub element:
>>
>> <AttributeMapping>
>> <targetAttribute>myns:myPoint/myns:MyPoint</targetAttribute>
>> <sourceExpression>
>> <OCQL>point</OCQL>
>> </sourceExpression>
>> ...
>> </AttributeMapping>
>>
>> Although the "point" column was not NULL, it produced the following
>> strange exception:
>>
>> org.geotools.feature.IllegalAttributeException:
>> http://example.com/myns:MyPointType not nillable:null value:null
>> ... [2]
>>
>> What am I doing wrong here?
>>
>>
>> Greets,
>> Volker
>>
>>
>>
>> [1] Full trace:
>>
>> org.geoserver.platform.ServiceException: java.lang.RuntimeException:
>> Failed to get property: gid
>> at org.geoserver.ows.Dispatcher.exception(Dispatcher.java:1304)
>> at
>> org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:240)
>> at
>> org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
>> at
>> org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
>> at
>> org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
>> at
>> org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
>> at
>> org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
>> at
>> org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>> at
>> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
>> at
>> org.vfny.geoserver.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)
>> at
>> org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
>> at
>> org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)
>> at
>> org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:73)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.geoserver.filters.ReverseProxyFilter.doFilter(ReverseProxyFilter.java:183)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:41)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
>> at
>> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>> at
>> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
>> at
>> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
>> at
>> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
>> at
>> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
>> at
>> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
>> at
>> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>> at org.mortbay.jetty.Server.handle(Server.java:324)
>> at
>> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
>> at
>> org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)
>> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
>> at
>> org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
>> at
>> org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
>> at
>> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
>> at
>> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
>> Caused by: java.lang.RuntimeException: Failed to get property: gid
>> at
>> org.geotools.xml.impl.GetPropertyExecutor.visit(GetPropertyExecutor.java:93)
>> at
>> org.geotools.xml.impl.BindingWalker$BindingExecutionChain.execute(BindingWalker.java:215)
>> at
>> org.geotools.xml.impl.BindingWalker.walk(BindingWalker.java:181)
>> at
>> org.geotools.xml.impl.BindingVisitorDispatch.walk(BindingVisitorDispatch.java:44)
>> at
>> org.geotools.xml.impl.BindingVisitorDispatch.walk(BindingVisitorDispatch.java:29)
>> at org.geotools.xml.Encoder.encode(Encoder.java:854)
>> at org.geotools.xml.Encoder.encode(Encoder.java:561)
>> at
>> org.geoserver.wfs.xml.GML3OutputFormat.write(GML3OutputFormat.java:190)
>> at
>> org.geoserver.wfs.WFSGetFeatureOutputFormat.write(WFSGetFeatureOutputFormat.java:137)
>> at org.geoserver.ows.Dispatcher.response(Dispatcher.java:726)
>> at
>> org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:234)
>> ... 49 more
>> Caused by: java.lang.ClassCastException:
>> org.geotools.feature.ComplexAttributeImpl cannot be cast to
>> com.vividsolutions.jts.geom.Geometry
>> at
>> org.geotools.gml3.bindings.PointTypeBinding.getProperty(PointTypeBinding.java:137)
>> at
>> org.geotools.xml.impl.GetPropertyExecutor.visit(GetPropertyExecutor.java:91)
>> ... 59 more
>>
>>
>> [2] Full trace:
>>
>> org.geoserver.platform.ServiceException:
>> org.geotools.feature.IllegalAttributeException:
>> http://example.com/myns:MyPointType not nillable:null value:null
>> at org.geoserver.ows.Dispatcher.exception(Dispatcher.java:1304)
>> at
>> org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:240)
>> at
>> org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
>> at
>> org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
>> at
>> org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
>> at
>> org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
>> at
>> org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
>> at
>> org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>> at
>> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
>> at
>> org.vfny.geoserver.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)
>> at
>> org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
>> at
>> org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
>> at
>> org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
>> at
>> org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)
>> at
>> org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:73)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.geoserver.filters.ReverseProxyFilter.doFilter(ReverseProxyFilter.java:183)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:41)
>> at
>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>> at
>> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
>> at
>> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>> at
>> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
>> at
>> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
>> at
>> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
>> at
>> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
>> at
>> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
>> at
>> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>> at org.mortbay.jetty.Server.handle(Server.java:324)
>> at
>> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
>> at
>> org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)
>> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
>> at
>> org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
>> at
>> org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
>> at
>> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
>> at
>> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
>> Caused by: org.geotools.feature.IllegalAttributeException:
>> http://example.com/myns:MyPointType 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:52)
>> at
>> org.geotools.feature.GeometryAttributeImpl.<init>(GeometryAttributeImpl.java:66)
>> at
>> org.geotools.feature.AppSchemaFeatureFactoryImpl.createGeometryAttribute(AppSchemaFeatureFactoryImpl.java:73)
>> at
>> org.geotools.feature.AttributeBuilder.create(AttributeBuilder.java:571)
>> at
>> org.geotools.feature.AttributeBuilder.add(AttributeBuilder.java:486)
>> at org.geotools.data.complex.filter.XPath.setValue(XPath.java:730)
>> at org.geotools.data.complex.filter.XPath.set(XPath.java:646)
>> at org.geotools.data.complex.filter.XPath.set(XPath.java:529)
>> at
>> org.geotools.data.complex.DataAccessMappingFeatureIterator.setAttributeValue(DataAccessMappingFeatureIterator.java:432)
>> at
>> org.geotools.data.complex.DataAccessMappingFeatureIterator.computeNext(DataAccessMappingFeatureIterator.java:704)
>> at
>> org.geotools.data.complex.AbstractMappingFeatureIterator.next(AbstractMappingFeatureIterator.java:193)
>> at
>> org.geotools.data.complex.MappingFeatureCollection.size(MappingFeatureCollection.java:300)
>> at org.geoserver.wfs.GetFeature.run(GetFeature.java:371)
>> at
>> org.geoserver.wfs.DefaultWebFeatureService.getFeature(DefaultWebFeatureService.java:115)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:616)
>> at
>> org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
>> at
>> org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
>> at
>> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
>> at org.geoserver.ows.util.EMFLogger.invoke(EMFLogger.java:51)
>> at
>> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>> at
>> org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>> at $Proxy15.getFeature(Unknown Source)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:616)
>> at org.geoserver.ows.Dispatcher.execute(Dispatcher.java:599)
>> at
>> org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:230)
>> ... 49 more
>>
>>
>>
>> ------------------------------------------------------------------------------
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>>
>>
>
> --
> Ben Caradoc-Davies <[email protected]>
> Software Engineering Team Leader
> CSIRO Earth Science and Resource Engineering
> Australian Resources Research Centre
>
--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
------------------------------------------------------------------------------
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