Package org.geotools.data

Class FIDFeatureReader

Object

FIDFeatureReader

All Implemented Interfaces:

Closeable, AutoCloseable, FeatureReader<SimpleFeatureType,SimpleFeature>

public class FIDFeatureReader
extends Object
implements FeatureReader<SimpleFeatureType,SimpleFeature>

Experimental FeatureReader that always takes the first column of the attributeReader as the FeatureID. I want to get this working with postgis, but then will consider other options, for those who want featureIDs created automatically. Perhaps a constructor param or a method to say that you would just like to have the FeatureReader increment one for each feature, prepending the typeName. I'm also don't really like the one argument constructor defaulting to the xxx typename. I feel that it should perhaps take a typename. If people deliberately set to null then we could use xxx or something. ch

This now feels sorta hacky, I'm not sure that I like it, but I'm going to commit as I need to go now and revisit it in a bit. I think the idea of passing in an FIDAttributeReader might be cleaner, and if none is provided then do an auto-increment one. This might then work as the DefaultFeatureReader.

Author:

Ian Schneider, Chris Holmes, TOPP

Field Summary

Fields

Modifier and Type	Field	Description
protected Object[]	attributes

Constructor Summary

Constructors

Constructor	Description
FIDFeatureReader(AttributeReader attributeReader, FIDReader fidReader)
FIDFeatureReader(AttributeReader attributeReader, FIDReader fidReader, SimpleFeatureType schema)	Creates a new instance of AbstractFeatureReader

Method Summary

Modifier and Type	Method	Description
void	close()	Release the underlying resources associated with this stream.
protected SimpleFeatureType	createSchema()
SimpleFeatureType	getFeatureType()	Return the FeatureType this reader has been configured to create.
boolean	hasNext()	Query whether this FeatureReader has another Feature.
SimpleFeature	next()	Reads the next Feature in the FeatureReader.
protected SimpleFeature	readFeature(AttributeReader atts)

Methods inherited from class Object

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

Field Detail

attributes

protected final Object[] attributes

Constructor Detail

FIDFeatureReader

public FIDFeatureReader(AttributeReader attributeReader,
                        FIDReader fidReader,
                        SimpleFeatureType schema)
                 throws SchemaException

Creates a new instance of AbstractFeatureReader

Parameters:

attributeReader - AttributeReader

fidReader - FIDReader used to ID Features

schema - FeatureType to use, may be null

Throws:

SchemaException - if we could not determine the correct FeatureType

FIDFeatureReader

public FIDFeatureReader(AttributeReader attributeReader,
                        FIDReader fidReader)
                 throws SchemaException

Throws:

SchemaException

Method Detail

next

public SimpleFeature next()
                   throws IOException,
                          IllegalAttributeException,
                          NoSuchElementException

Description copied from interface: FeatureReader

Reads the next Feature in the FeatureReader.

Specified by:

next in interface FeatureReader<SimpleFeatureType,SimpleFeature>

Returns:

The next feature in the reader.

Throws:

IOException - If an error occurs reading the Feature.

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

IllegalAttributeException

createSchema

protected SimpleFeatureType createSchema()
                                  throws SchemaException

Throws:

SchemaException

readFeature

protected SimpleFeature readFeature(AttributeReader atts)
                             throws IllegalAttributeException,
                                    IOException

Throws:

IllegalAttributeException

IOException

close

public void close()
           throws IOException

Description copied from interface: FeatureReader

Release the underlying resources associated with this stream.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface FeatureReader<SimpleFeatureType,SimpleFeature>

Throws:

IOException - if an I/O error occurs

getFeatureType

public SimpleFeatureType getFeatureType()

Description copied from interface: FeatureReader

Return the FeatureType this reader has been configured to create.

Specified by:

getFeatureType in interface FeatureReader<SimpleFeatureType,SimpleFeature>

Returns:

the FeatureType of the Features this FeatureReader will create.

hasNext

public boolean hasNext()
                throws IOException

Description copied from interface: FeatureReader

Query whether this FeatureReader has another Feature.

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.