Examples of org.geotools.process.vector.TransformProcess

org.geotools.process.vector.TransformProcess

Used to transform a feature collection as defined using a series of expressions.

The definition of the output feature type can be provided as a {@link Definition} data structureor using a simple string format:

 the_geom=the_geom name=name area=area( the_geom )

Attribute definitions can be delimited by line breaks and/or by semicolons.

This is a very flexible process which can be used to:

Change the order of attributes - resulting in a new feature type:

 INPUT Schema          DEFINITION                     OUTPUT Schema the_geom: Polygon     the_geom                       the_geom: Polygon name: String          id                             id: Long id: Long              name                           name: String description: String   description                    description: String

Rename or remove attributes - resulting in a new feature type:

 INPUT Schema          DEFINITION                     OUTPUT Schema the_geom: Polygon     the_geom                       the_geom: Polygon name: String          id_code=id                     id_code: Long id: Long              summary=description            summary: String description: String

Process geometry - using functions like "the_geom=simplify( the_geom, 2.0 )" or "the_geom=centriod( the_geom )":

 INPUT Schema          DEFINITION                     OUTPUT Schema the_geom: Polygon     the_geom=centriod(the_geom)    the_geom: Point name: String          name                           name: String id: Long              id                             id: Long description: String   description                    description: String

Generate additional attributes using the form: area=area( the_geom ):

 INPUT Schema          DEFINITION                     OUTPUT Schema the_geom: Polygon     the_geom=centriod(the_geom)    the_geom: Point name: String          name                           name: String id: Long              id                             id: Long description: String   description                    description: String area=area( the_geom)           area: Double text=concatenate(name,'-',id)  text: String

This is a port of the uDig "reshape" operation to the GeoTools process framework. @author Jody Garnett (LISAsoft) @source $URL$

        if( monitor == null ) monitor = new NullProgressMonitor();
        
        monitor.beginTask(Messages.ReshapeOperation_task, 100 );


        List<Definition> transform = dialog.getTransform();
        TransformProcess process = new TransformProcess();
        DefaultTransaction transaction = new DefaultTransaction("Processing "+source.getName() ); //$NON-NLS-1$
        try {
            SimpleFeatureCollection collection = source.getFeatures();
            SimpleFeatureCollection output = process.executeList(collection, transform);


            
            final SimpleFeatureType featureType = output.getSchema();
            
            IGeoResource scratch = CatalogPlugin.getDefault().getLocalCatalog().createTemporaryResource( featureType );

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        if( monitor == null ) monitor = new NullProgressMonitor();
        
        monitor.beginTask(Messages.ReshapeOperation_task, 100 );


        List<Definition> transform = dialog.getTransform();
        TransformProcess process = new TransformProcess();
        DefaultTransaction transaction = new DefaultTransaction("Processing "+source.getName() ); //$NON-NLS-1$
        try {
            SimpleFeatureCollection collection = source.getFeatures();
            SimpleFeatureCollection output = process.executeList(collection, transform);


            
            final SimpleFeatureType featureType = output.getSchema();
            
            IGeoResource scratch = CatalogPlugin.getDefault().getLocalCatalog().createTemporaryResource( featureType );

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    String transform =
        "the_geom=the_geom\n"+
        "name=name\n"+
        "area=area( the_geom )";
    
    TransformProcess process = new TransformProcess();
    
    SimpleFeatureCollection features = process.execute( featureCollection, transform );
    // transform end
}

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    @Test
    public void testSum() throws Exception {
        SimpleFeatureSource source = bugs.getFeatureSource("bugsites");


        
        TransformProcess process = new TransformProcess();
        
        String definition = "the_geom=the_geom\nnumber=cat";
        SimpleFeatureCollection origional = source.getFeatures();
        SimpleFeatureCollection result = process.execute( origional, definition );
        
        assertEquals( origional.size(), result.size() );
        
        SimpleFeatureType schema = result.getSchema();
        AttributeDescriptor number = schema.getDescriptor("number");

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Related Classes of org.geotools.process.vector.TransformProcess

org.geotools.data.simple.SimpleFeatureIterator

org.geotools.feature.simple.SimpleFeatureBuilder

org.geotools.feature.simple.SimpleFeatureTypeBuilder

org.geotools.process.FeatureProcessExamples

org.geotools.process.vector.TransformProcessTest

org.locationtech.udig.catalog.ui.operation.ReshapeOperation

org.locationtech.udig.catalog.ui.operation.TransformOperation

org.opengis.feature.simple.SimpleFeature

org.opengis.feature.simple.SimpleFeatureType

org.opengis.feature.type.AttributeDescriptor

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