Examples of org.geotools.factory.Hints

org.geotools.factory.Hints
A set of hints providing control on factories to be used. Those hints are typically used by renderers or {@linkplain org.opengis.coverage.processing.GridCoverageProcessor grid coverageprocessors} for example. They provides a way to control low-level details. Example:
```
 CoordinateOperationFactory myFactory = &hellip Hints hints = new Hints(Hints. {@linkplain #COORDINATE_OPERATION_FACTORY}, myFactory); AbstractProcessor processor = new DefaultProcessor(hints); 
```
Any hint mentioned by this class is considered to be API, failure to make use of a hint by a GeoTools factory implementation is considered a bug (as it will prevent the use of this library for application specific tasks).
When hints are used in conjunction with the {@linkplain FactoryRegistry factory servicediscovery mechanism} we have the complete geotools plugin system. By using hints toallow application code to effect service discovery we allow client code to retarget the geotools library for their needs. @since 2.1 @source $URL$ @version $Id$ @author Martin Desruisseaux @author Jody Garnett


        // Preparing an useful layout in case the image is striped.
        final ImageLayout l = new ImageLayout();
        l.setTileGridXOffset(0).setTileGridYOffset(0).setTileHeight(512).setTileWidth(512);


        Hints hints = new Hints();
        hints.add(new RenderingHints(JAI.KEY_IMAGE_LAYOUT, l));


        File file = null;
        try{
            file = TestData.file(this, fileName);
        }catch (FileNotFoundException fnfe){

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        // Preparing an useful layout in case the image is striped.
        final ImageLayout l = new ImageLayout();
        l.setTileGridXOffset(0).setTileGridYOffset(0).setTileHeight(512).setTileWidth(512);


        Hints hints = new Hints();
        hints.add(new RenderingHints(JAI.KEY_IMAGE_LAYOUT, l));


        // get a reader
        final File file = TestData.file(this, fileName);
        final BaseGDALGridCoverage2DReader reader = new DTEDReader(file, hints);

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     */
    @Before
    public void setUp() throws Exception {
        if (factory == null) {
            factory = (ThreadedEpsgFactory) ReferencingFactoryFinder.getCRSAuthorityFactory("EPSG",
                        new Hints(Hints.CRS_AUTHORITY_FACTORY, ThreadedEpsgFactory.class));
            extensive |= TestData.isExtensiveTest();
            if (verbose) {
                System.out.print("Database version: ");
                System.out.println(factory.getImplementationHints().get(Hints.VERSION));
            }

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    // Preparing an useful layout in case the image is striped.
                final ImageLayout l = new ImageLayout();
                l.setTileGridXOffset(0).setTileGridYOffset(0).setTileHeight(512)
                                .setTileWidth(512);


                Hints hints = new Hints();
                hints.add(new RenderingHints(JAI.KEY_IMAGE_LAYOUT, l));
       
    final BaseGDALGridCoverage2DReader reader = new RPFTOCReader(file, hints);


    // /////////////////////////////////////////////////////////////////////
    //

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    private List<RasterDescriptor> descriptors = new ArrayList<RasterDescriptor>();
    
    private List<RasterSlice> slices= new ArrayList<RasterSlice>();
    
    public TiffRasterManagerBuilder() {
        super(new Hints());
    }

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    public void setJava2DHints(RenderingHints hints) {
    }


    @Override
    public RenderingHints getJava2DHints() {
        return new Hints();
    }

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            validateConfiguredNamespaces(targetXPathSteps);


            final boolean isMultiValued = attDto.isMultiple();
            
            final Expression idExpression = (idXpath == null) ? parseOgcCqlExpression(idExpr)
                    : new AttributeExpressionImpl(idXpath, new Hints(
                            FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, this.namespaces));
            // if the data source is a data access, the input XPath expression is the source
            // expression
            final Expression sourceExpression; 


            sourceExpression = (inputXPath == null) ? parseOgcCqlExpression(sourceExpr)
                    : new AttributeExpressionImpl(inputXPath, new Hints(
                            FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, this.namespaces));


            final AttributeType expectedInstanceOf;


            final Map clientProperties = getClientProperties(attDto);

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        final AbstractGridFormat format = new GeoTiffFormat();
        assertTrue(format.accepts(noCrs));


        // hint for CRS
        final CoordinateReferenceSystem crs = CRS.decode("EPSG:32632", true);
        final Hints hint = new Hints();
        hint.put(Hints.DEFAULT_COORDINATE_REFERENCE_SYSTEM, crs);


        // getting a reader
        GeoTiffReader reader = new GeoTiffReader(noCrs, hint);


        // reading the coverage

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        assertTrue(CRS.equalsIgnoreMetadata(coverage.getCoordinateReferenceSystem(), DefaultEngineeringCRS.GENERIC_2D));
        


        // hint for CRS
        crs = CRS.decode("EPSG:32632", true);
        final Hints hint = new Hints();
        hint.put(Hints.DEFAULT_COORDINATE_REFERENCE_SYSTEM, crs);


        // getting a reader
        reader = new GeoTiffReader(noCrs, hint);


        // reading the coverage

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                o = files[i].toURI().toURL();
            if (format.accepts(o)) {
                buffer.append("ACCEPTED").append("\n");


                // getting a reader
                GeoTiffReader reader = new GeoTiffReader(o, new Hints(
                        Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));


                if (reader != null) {


                    // reading the coverage

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