org.geotools.data
Class DiffFeatureReader

java.lang.Object
  org.geotools.data.DiffFeatureReader

All Implemented Interfaces:

FeatureReader

public class DiffFeatureReader

extends java.lang.Object

implements FeatureReader

A FeatureReader that considers differences.

Used to implement In-Process Transaction support. This implementation will need to peek ahead in order to check for deletetions.

Author:

Jody Garnett, Refractions Research

Constructor Summary

DiffFeatureReader(FeatureReader reader, java.util.Map diff)
This constructor grabs a "copy" of the current diff.

Method Summary

void	close() Release the underlying resources associated with this stream.
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.

Methods inherited from class java.lang.Object

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

Constructor Detail

DiffFeatureReader

public DiffFeatureReader(FeatureReader reader,
                         java.util.Map diff)

This constructor grabs a "copy" of the current diff.

This reader is not "live" to changes over the course of the Transaction. (Iterators are not always stable of the course of modifications)

Parameters:

reader -

diff - Differences of Feature by FID

Method Detail

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.

See Also:

FeatureReader.getFeatureType()

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.

See Also:

FeatureReader.next()

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.

See Also:

FeatureReader.hasNext()

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

See Also:

FeatureReader.close()