org.geotools.data.vpf.file

Class VPFFileFeatureSource

Object

ContentFeatureSource

VPFFeatureSource

VPFFileFeatureSource

All Implemented Interfaces:

FeatureSource<SimpleFeatureType,SimpleFeature>, SimpleFeatureSource

public class VPFFileFeatureSource
extends VPFFeatureSource

VPFFile Feature Source

Author:

James Gambale (Alysida AI)

Field Summary

Fields inherited from class ContentFeatureSource

entry, hints, lock, query, queryCapabilities, schema, transaction

Constructor Summary

Constructors

Constructor and Description
VPFFileFeatureSource(ContentEntry entry, Query query)

Method Summary

Modifier and Type	Method and Description
protected SimpleFeatureType	buildFeatureType() Creates the feature type or schema for the feature source.
protected ReferencedEnvelope	getBoundsInternal(Query query) Implementation that generates the total bounds (many file formats record this information in the header)
protected int	getCountInternal(Query query) Calculates the number of features of a specified query.
protected FeatureReader<SimpleFeatureType,SimpleFeature>	getReaderInternal(Query query) Subclass method for returning a native reader from the datastore.

Methods inherited from class VPFFeatureSource

getDataStore, getFeatureSource, getName, setFeatureSource

Methods inherited from class ContentFeatureSource

accepts, addFeatureListener, addHints, buildQueryCapabilities, canEvent, canFilter, canLimit, canLock, canOffset, canReproject, canRetype, canSort, canTransact, doLockInternal, doUnlockInternal, getAbsoluteSchema, getBounds, getBounds, getCount, getEntry, getFeatures, getFeatures, getFeatures, getInfo, getQueryCapabilities, getReader, getReader, getReader, getSchema, getState, getSupportedHints, getTransaction, getView, getView, handleVisitor, isView, joinQuery, lockFeatures, lockFeatures, lockFeatures, processLock, removeFeatureListener, resolvePropertyNames, resolvePropertyNames, setFeatureLock, setTransaction, unLockFeatures, unLockFeatures, unLockFeatures

Methods inherited from class Object

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

Constructor Detail

VPFFileFeatureSource

public VPFFileFeatureSource(ContentEntry entry,
                            Query query)

Method Detail

getReaderInternal

protected FeatureReader<SimpleFeatureType,SimpleFeature> getReaderInternal(Query query)
                                                                    throws IOException

Description copied from class: ContentFeatureSource

Subclass method for returning a native reader from the datastore.

It is important to note that if the native reader intends to handle any of the following natively:

• reprojection
• filtering
• max feature limiting
• sorting
• locking
• transactions

Then it *must* set the corresponding flags to true:

• ContentFeatureSource.canReproject() - handles Query.getCoordinateSystemReproject() internally. Example would be PostGIS using Proj to handle reproejction internally
• ContentFeatureSource.canFilter() - handles Query#getFilter() internally.
• {@link #canLimit()} - handles {@link Query#getMaxFeatures()} and {@link Query#getStartIndex()} internally.
• {@link #canSort()} - handles {@link Query#getSortBy()} natively.
• {@link #canRetype()} - handles {@link Query#getProperties()} natively. Example would be only parsing the properties the user asks for from an XML file
• {@link #canLock()} - handles read-locks natively
• {@link #canTransact()} - handles transactions natively

Specified by:

getReaderInternal in class ContentFeatureSource

Throws:

IOException

getCountInternal

protected int getCountInternal(Query query)
                        throws IOException

Description copied from class: ContentFeatureSource

Calculates the number of features of a specified query. Subclasses must implement this method. If the computation is not fast, it's possible to return -1.

Specified by:

getCountInternal in class ContentFeatureSource

Throws:

IOException

getBoundsInternal

protected ReferencedEnvelope getBoundsInternal(Query query)
                                        throws IOException

Implementation that generates the total bounds (many file formats record this information in the header)

Specified by:

getBoundsInternal in class ContentFeatureSource

Throws:

IOException

buildFeatureType

protected SimpleFeatureType buildFeatureType()
                                      throws IOException

Description copied from class: ContentFeatureSource

Creates the feature type or schema for the feature source.

Implementations should use SimpleFeatureTypeBuilder to build the feature type. Also, the builder should be injected with the feature factory which has been set on the DataStore (see ContentDataStore.getFeatureFactory(). Example:

   SimpleFeatureTypeBuilder b = new SimpleFeatureTypeBuilder();
   b.setFeatureTypeFactory( getDataStore().getFeatureTypeFactory() );

   //build the feature type
   ...
 

Specified by:

buildFeatureType in class ContentFeatureSource

Throws:

IOException