Hi list,
I'm trying to write a new coverage processing operation. I've followed
the instructions in
http://www.nabble.com/forum/ViewPost.jtp?post=3585286&framed=y and the
service provider class seems to be being picked up fine by the Registry.
My OpImage class is also registered fine with JAI (and I can run it
using getRenderedImage() from my GridCoverage2D and then creating a neew
GridCoverage2D with the result), but when I try instantiating the
Operation I get the stack trace below.
I've attached the code for the geotools JAIOperation and the JAI
OperationDescriptor below, as I've a feeling from the traceback that I
could be missing something in the OperationDescriptor (but can't work
out what).
Any ideas much appreciated! If I can get this to work then I've got a
few coverage operations that I want to turn into "proper" JAI/GeoTools
operations and would then be able to donate to GeoTools...
Thanks in advance,
Ed
The stack trace:
> WARNUNG: Can't load a service for category "Operation". Cause is
> "ServiceConfigurationError: org (...) java.lang.NullPointerException".
> sun.misc.ServiceConfigurationError:
> org.opengis.coverage.processing.Operation: Provider
> org.preagro.utils.coverages.operations.OutlierFilterOperation could no
> t be instantiated: java.lang.NullPointerException
> at sun.misc.Service.fail(Service.java:120)
> at sun.misc.Service.access$200(Service.java:111)
> at sun.misc.Service$LazyIterator.next(Service.java:276)
> at
> org.geotools.factory.FactoryRegistry.scanForPlugins(FactoryRegistry.java:564)
> at
> org.geotools.factory.FactoryRegistry.safeScanForPlugins(FactoryRegistry.java:540)
> at
> org.geotools.factory.FactoryRegistry.getServiceProviders(FactoryRegistry.java:175)
> at
> org.geotools.factory.FactoryRegistry.getServiceProviders(FactoryRegistry.java:117)
> at
> org.geotools.coverage.processing.DefaultProcessor.scanForPlugins(DefaultProcessor.java:331)
> at
> org.geotools.coverage.processing.DefaultProcessor.getOperation(DefaultProcessor.java:231)
> at
> org.geotools.coverage.processing.BufferedProcessor.getOperation(BufferedProcessor.java:107)
> at
> org.preagro.wps.processes.generic.coverageoperations.DivideByMean.execute(DivideByMean.java:115)
> at
> org.deegree.ogcwebservices.wps.execute.ExecuteRequestHandler.startProcess(ExecuteRequestHandler.java:322)
> at
> org.deegree.ogcwebservices.wps.execute.ExecuteRequestHandler.handleStoreParameter(ExecuteRequestHandler.java:255)
> at
> org.deegree.ogcwebservices.wps.execute.ExecuteRequestHandler.handleRequest(ExecuteRequestHandler.java:182)
> at
> org.deegree.ogcwebservices.wps.WPService.doService(WPService.java:123)
> at
> org.deegree.enterprise.servlet.WPSHandler.perform(WPSHandler.java:101)
> at
> org.deegree.enterprise.servlet.OGCServletController.doService(OGCServletController.java:144)
> at
> org.deegree.enterprise.servlet.OGCServletController.doGet(OGCServletController.java:228)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
> at
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
> at
> org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
> at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
> at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:754)
> at
> org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:684)
> at
> org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)
> at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
> at java.lang.Thread.run(Thread.java:595)
> Caused by: java.lang.NullPointerException
> at
> org.geotools.referencing.NamedIdentifier.getName(NamedIdentifier.java:437)
> at
> org.geotools.referencing.NamedIdentifier.getName(NamedIdentifier.java:424)
> at
> org.geotools.referencing.NamedIdentifier.toString(NamedIdentifier.java:565)
> at
> org.geotools.referencing.AbstractIdentifiedObject.<init>(AbstractIdentifiedObject.java:463)
> at
> org.geotools.referencing.AbstractIdentifiedObject.<init>(AbstractIdentifiedObject.java:247)
> at
> org.geotools.parameter.AbstractParameterDescriptor.<init>(AbstractParameterDescriptor.java:88)
> at
> org.geotools.parameter.DefaultParameterDescriptorGroup.<init>(DefaultParameterDescriptorGroup.java:161)
> at
> org.geotools.parameter.ImagingParameterDescriptors.<init>(ImagingParameterDescriptors.java:193)
> at
> org.geotools.parameter.ImagingParameterDescriptors.<init>(ImagingParameterDescriptors.java:163)
> at
> org.geotools.parameter.ImagingParameterDescriptors.<init>(ImagingParameterDescriptors.java:140)
> at
> org.geotools.coverage.processing.OperationJAI.<init>(OperationJAI.java:160)
> at
> org.geotools.coverage.processing.OperationJAI.<init>(OperationJAI.java:150)
> at
> org.preagro.utils.coverages.operations.OutlierFilterOperation.<init>(OutlierFilterOperation.java:44)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
> at java.lang.Class.newInstance0(Class.java:350)
> at java.lang.Class.newInstance(Class.java:303)
> at sun.misc.Service$LazyIterator.next(Service.java:271)
> ... 33 more
Code for the OperationJAI extension is:
public class OutlierFilterOperation extends OperationJAI {
public OutlierFilterOperation() {
super("org.preagro.OutlierFilter");
}
@Override
protected NumberRange deriveRange(
final NumberRange[] ranges,
final Parameters parameters
)
{
final NumberRange originalRange = ranges[0];
ParameterBlock params = parameters.parameters;
final double min = Math.max(
originalRange.getMinimum(),
params.getDoubleParameter(0)
);
final double max = Math.min(
originalRange.getMaximum(),
params.getDoubleParameter(1)
);
return new NumberRange(min, max);
}
@Override
protected Unit deriveUnit(Unit[] units, Parameters parameters) {
return units[0];
}
}
And the JAI OperationDescriptor (since looking at the traceback I have a
feeling that there might be something missing here):
public class OutlierFilterDescriptor extends OperationDescriptorImpl {
private static boolean registered = false;
public static final String VENDOR_NAME = "org.preagro";
public static final String OPERATION_NAME = VENDOR_NAME +
".OutlierFilter";
public static final String ERROR = "The OriginalValues and
TargetValues must have the same number of components";
public OutlierFilterDescriptor() {
super(new String[][]{{"GlobalName", OPERATION_NAME},
{"LocalName", OPERATION_NAME},
{"Vendor", VENDOR_NAME},
{"Description", "Filter outlier values
below minValue and above maxValue and turn them to NaNs"},
{"DocURL", "http://www.preagro.de/"},
{"Version", "1.0"}},
new String[] {RenderedRegistryMode.MODE_NAME}, 1,
new String[] {"minValue", "maxValue"},
new Class[] {Double.class, Double.class},
new Object[] {- Double.MAX_VALUE, Double.MAX_VALUE},
null)
);
}
public static RenderedOp create(final RenderedImage original, final
double minValue, final double maxValue, final RenderingHints hints) {
ParameterBlock params = new ParameterBlock();
params.addSource(original);
params.add(new Double(minValue));
params.add(new Double(maxValue));
return JAI.create(OPERATION_NAME, params, hints);
}
public static boolean register(final OperationRegistry registry) {
try {
if (!registered) {
registry.registerDescriptor(new OutlierFilterDescriptor());
registry.registerFactory(RenderedRegistryMode.MODE_NAME,
OPERATION_NAME, VENDOR_NAME, new OutlierFilterCRIF());
registered = true;
}
} catch (IllegalArgumentException e) {
// TODO suppress the error ?
// TODO log rather than printStackTrace ??
System.out.println("Failed to register operation");
e.printStackTrace();
}
return registered;
}
static {
// force registration of the operation in case registryFile.jai
// is/was not available to the JAI classloader
register(JAI.getDefaultInstance().getOperationRegistry());
}
}
--
preagro TP7 - Geodateninfrastruktur
http://www.preagro.de
Universität Rostock
Agrar- und Umweltwissenschaftliche Fakultät
Professur für Geodäsie und Geoinformatik
Justus-von-Liebig-Weg 6
18059 Rostock
Tel: +49 381 498 3212
Fax: +49 381 498 3202
Web: http://www.auf.uni-rostock.de/gg
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