[Geotools-devel] [jira] Created: (GEOT-1741) OperationJAI.doOperation throws NullPointerException when working on GridSampleDimension without categories.

[Daniele Romagnoli (JIRA)]

OperationJAI.doOperation throws NullPointerException when working on 
GridSampleDimension without categories.
------------------------------------------------------------------------------------------------------------

                 Key: GEOT-1741
                 URL: http://jira.codehaus.org/browse/GEOT-1741
             Project: GeoTools
          Issue Type: Bug
          Components: core coverage
    Affects Versions: 2.5-M0, 2.4.1
            Reporter: Daniele Romagnoli
            Assignee: Martin Desruisseaux
         Attachments: test1.tif

A Rescale operation performed on a GridCoverage built with a single 
GridSampleDimension without categories results in a NullPointerException thrown 
by the OperationJAI class when calling deriveSampleDimension(...).

Basically, the deriveSampledDimension method invoked by the doOperation method 
contains the code:
 Category[]      categoryArray = (Category[]) 
sampleDim.getCategories().toArray();

The GridSampleDimension constructor allows the creation of a Sample Dimension 
without categories. In such a case, the getCategories method returns null.

Here below there is a standalone test case which reproduces the problem (test 
data is in attachment):
------------------------------------------------------------------------------------------------------

package org.geotools.coverage.processing;

import java.awt.Rectangle;
import java.io.File;

import javax.imageio.ImageIO;
import javax.media.jai.PlanarImage;

import junit.framework.TestCase;

import org.geotools.coverage.CoverageFactoryFinder;
import org.geotools.coverage.GridSampleDimension;
import org.geotools.coverage.grid.GeneralGridRange;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridCoverageFactory;
import org.geotools.coverage.processing.operation.Rescale;
import org.geotools.geometry.GeneralEnvelope;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.geotools.referencing.operation.builder.GridToEnvelopeMapper;
import org.opengis.parameter.ParameterValueGroup;
import org.opengis.referencing.operation.MathTransform;

public class OperationJAITest extends TestCase {
        private PlanarImage image;

        public OperationJAITest(String name) {
                super(name);
        }

        protected void setUp() throws Exception {
                image = PlanarImage.wrapRenderedImage(ImageIO.read(new File(
                                "c:/test1.tif")));
                super.setUp();
        }

        protected void tearDown() throws Exception {
                super.tearDown();
        }

        public void test() {

                // //
                //
                // Setting SampleDimensions
                //
                // //
                final GridSampleDimension[] bands = new GridSampleDimension[1];
                bands[0] = new GridSampleDimension("GRAY").geophysics(false);

                // //
                //
                // Preparing coverage properties
                //
                // //
                final GeneralGridRange gridRange = new GeneralGridRange(new 
Rectangle(
                                0, 0, image.getWidth(), image.getHeight()));
                final GeneralEnvelope envelope = new GeneralEnvelope(new 
double[] {
                                40.0, 40.0 }, new double[] { 40.004, 40.004 });
                final GridToEnvelopeMapper geMapper = new 
GridToEnvelopeMapper();
                geMapper.setEnvelope(envelope);
                geMapper.setGridRange(gridRange);
                final MathTransform raster2Model = geMapper.createTransform();

                // //
                //
                // Creating the coverage
                //
                // //
                final GridCoverageFactory gcf = CoverageFactoryFinder
                                .getGridCoverageFactory(null);
                final GridCoverage2D gc = gcf.create("coverage", image,
                                DefaultGeographicCRS.WGS84, raster2Model, 
bands, null, null);

                // //
                //
                // Rescale operation
                //
                // //
                final DefaultProcessor proc = new DefaultProcessor(null);
                Rescale rescale = new Rescale();
                ParameterValueGroup parameters = proc.getOperation("Rescale")
                                .getParameters();
                parameters.parameter("Source").setValue(gc);
                parameters.parameter("constants").setValue(new double[] { 
0.005d });
                parameters.parameter("offsets").setValue(new double[] { 0.0d });
                GridCoverage2D gc2d = (GridCoverage2D) 
rescale.doOperation(parameters,
                                null);
        }
}



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