org.geotools.data
Class FIDFeatureReader

java.lang.Object
  extended byorg.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,v 1.4 2003/11/20 23:27:41 cholmesny Exp $
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

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.


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