org.geotools.data
Class DiffFeatureReader

java.lang.Object
  extended byorg.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.
DiffFeatureReader(FeatureReader reader, java.util.Map diff, Filter filter)
          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

DiffFeatureReader

public DiffFeatureReader(FeatureReader reader,
                         java.util.Map diff,
                         Filter filter)
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 - DOCUMENT ME!
See Also:
FeatureReader.close()


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