org.geotools.data
Class FIDFeatureReader

java.lang.Object
  org.geotools.data.FIDFeatureReader

All Implemented Interfaces:

FeatureReader

public class FIDFeatureReader

extends java.lang.Object

implements FeatureReader

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.

Version:

$Id: FIDFeatureReader.java 17701 2006-01-23 00:00:51Z desruisseaux $

Author:

Ian Schneider, Chris Holmes, TOPP

Field Summary

protected java.lang.Object[]

attributes

Constructor Summary

FIDFeatureReader(AttributeReader attributeReader, FIDReader fidReader)

FIDFeatureReader(AttributeReader attributeReader, FIDReader fidReader, FeatureType schema)
Creates a new instance of AbstractFeatureReader

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

attributes

protected final java.lang.Object[] attributes

Constructor Detail

FIDFeatureReader

public FIDFeatureReader(AttributeReader attributeReader,
                        FIDReader fidReader,
                        FeatureType 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

Method Detail

next

public Feature next()
             throws java.io.IOException,
                    IllegalAttributeException,
                    java.util.NoSuchElementException

Description copied from interface: FeatureReader

Reads the next Feature in the FeatureReader.

Specified by:

next in interface FeatureReader

Returns:

The next feature in the reader.

Throws:

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

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

java.io.IOException - If an error occurs reading the Feature.

createSchema

protected FeatureType createSchema()
                            throws SchemaException

Throws:

SchemaException

readFeature

protected Feature readFeature(AttributeReader atts)
                       throws IllegalAttributeException,
                              java.io.IOException

Throws:

IllegalAttributeException

java.io.IOException

close

public void close()
           throws java.io.IOException

Description copied from interface: FeatureReader

Release the underlying resources associated with this stream.

Specified by:

close in interface FeatureReader

Throws:

java.io.IOException - DOCUMENT ME!

getFeatureType

public FeatureType getFeatureType()

Description copied from interface: FeatureReader

Return the FeatureType this reader has been configured to create.

Specified by:

getFeatureType in interface FeatureReader

Returns:

the FeatureType of the Features this FeatureReader will create.

hasNext

public boolean hasNext()
                throws java.io.IOException

Description copied from interface: FeatureReader

Query whether this FeatureReader has another Feature.

Specified by:

hasNext in interface FeatureReader

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:

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