org.geotools.data.crs

Class ReprojectFeatureReader

Object

ReprojectFeatureReader

All Implemented Interfaces:

Closeable, AutoCloseable, DelegatingFeatureReader<SimpleFeatureType,SimpleFeature>, FeatureReader<SimpleFeatureType,SimpleFeature>

public class ReprojectFeatureReader
extends Object
implements DelegatingFeatureReader<SimpleFeatureType,SimpleFeature>

ReprojectFeatureReader provides a reprojection for FeatureTypes.

ReprojectFeatureReader is a wrapper used to reproject GeometryAttributes to a user supplied CoordinateReferenceSystem from the original CoordinateReferenceSystem supplied by the original FeatureReader.

Example Use:

 ReprojectFeatureReader reader =
     new ReprojectFeatureReader( originalReader, reprojectCS );

 CoordinateReferenceSystem originalCS =
     originalReader.getFeatureType().getDefaultGeometry().getCoordinateSystem();

 CoordinateReferenceSystem newCS =
     reader.getFeatureType().getDefaultGeometry().getCoordinateSystem();

 assertEquals( reprojectCS, newCS );
 

TODO: handle the case where there is more than one geometry and the other geometries have a different CS than the default geometry

Author:

jgarnett, Refractions Research, Inc., aaime, $Author: jive $ (last modification)

Constructor Summary

Constructors

Constructor and Description
ReprojectFeatureReader(FeatureReader<SimpleFeatureType,SimpleFeature> reader, CoordinateReferenceSystem cs) Constructor that will generate schema and mathTransforms for the results.
ReprojectFeatureReader(FeatureReader<SimpleFeatureType,SimpleFeature> reader, SimpleFeatureType schema) Constructor that will generate mathTransforms for the results, based on target schema.
ReprojectFeatureReader(FeatureReader<SimpleFeatureType,SimpleFeature> reader, SimpleFeatureType schema, MathTransform transform) Direct constructor reprojecting the provided reader into the schema indicated (using the supplied math transformation).

Method Summary

Modifier and Type	Method and Description
void	close() Implement close.
FeatureReader<SimpleFeatureType,SimpleFeature>	getDelegate()
SimpleFeatureType	getFeatureType() Implement getFeatureType.
protected GeometryCoordinateSequenceTransformer	getTransformer(Name attributeName)
boolean	hasNext() Implement hasNext.
SimpleFeature	next() Implement next.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReprojectFeatureReader

public ReprojectFeatureReader(FeatureReader<SimpleFeatureType,SimpleFeature> reader,
                              SimpleFeatureType schema,
                              MathTransform transform)

Direct constructor reprojecting the provided reader into the schema indicated (using the supplied math transformation).

Please note schema is that of the expected results, You may need to use FeatureTypes.transform( FeatureType, crs ) to create the schema provider.

Parameters:

reader - original reader with results in the original coordinate reference system

schema - This is the target schema describing the results in the expected coordinate reference system

transform - the math transform used to go from reader coordinate reference system to the provided schema coordinate reference system

ReprojectFeatureReader

public ReprojectFeatureReader(FeatureReader<SimpleFeatureType,SimpleFeature> reader,
                              CoordinateReferenceSystem cs)
                       throws SchemaException,
                              OperationNotFoundException,
                              NoSuchElementException,
                              FactoryException

Constructor that will generate schema and mathTransforms for the results.

Parameters:

reader - original reader

cs - Target coordinate reference system; will be used to create the target FeatureType and MathTransforms used to transform the data

Throws:

SchemaException

OperationNotFoundException

NoSuchElementException

FactoryException

ReprojectFeatureReader

public ReprojectFeatureReader(FeatureReader<SimpleFeatureType,SimpleFeature> reader,
                              SimpleFeatureType schema)
                       throws SchemaException,
                              OperationNotFoundException,
                              NoSuchElementException,
                              FactoryException

Constructor that will generate mathTransforms for the results, based on target schema.

Parameters:

reader - original reader

schema - Target schema; will be used to create the target MathTransforms used to transform the data

Throws:

SchemaException

OperationNotFoundException

NoSuchElementException

FactoryException

Method Detail

getTransformer

protected GeometryCoordinateSequenceTransformer getTransformer(Name attributeName)

getDelegate

public FeatureReader<SimpleFeatureType,SimpleFeature> getDelegate()

Specified by:

getDelegate in interface DelegatingFeatureReader<SimpleFeatureType,SimpleFeature>

Returns:

The delegate feature reader.

getFeatureType

public SimpleFeatureType getFeatureType()

Implement getFeatureType.

Description ...

Specified by:

getFeatureType in interface FeatureReader<SimpleFeatureType,SimpleFeature>

Returns:

the FeatureType of the Features this FeatureReader will create.

See Also:

FeatureReader.getFeatureType()

next

public SimpleFeature next()
                   throws IOException,
                          IllegalAttributeException,
                          NoSuchElementException

Implement next.

Description ...

Specified by:

next in interface FeatureReader<SimpleFeatureType,SimpleFeature>

Returns:

The next feature in the reader.

Throws:

IOException - If an error occurs reading the Feature.

IllegalAttributeException - If the attributes read do not comply with the FeatureType.

NoSuchElementException - If there are no more Features in the Reader.

See Also:

FeatureReader.next()

hasNext

public boolean hasNext()
                throws IOException

Implement hasNext.

Description ...

Specified by:

hasNext in interface FeatureReader<SimpleFeatureType,SimpleFeature>

Returns:

True if there are more Features to be read. In other words, true if calls to next would return a feature rather than throwing an exception.

Throws:

IOException - If an error occurs determining if there are more Features.

See Also:

FeatureReader.hasNext()

close

public void close()
           throws IOException

Implement close.

Description ...

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface FeatureReader<SimpleFeatureType,SimpleFeature>

Throws:

IOException - if an I/O error occurs

See Also:

FeatureReader.close()