Package org.geotools.data.csv

Class CSVFeatureStore

Object

ContentFeatureSource

ContentFeatureStore

CSVFeatureStore

All Implemented Interfaces:

FeatureLocking<SimpleFeatureType,SimpleFeature>, FeatureSource<SimpleFeatureType,SimpleFeature>, FeatureStore<SimpleFeatureType,SimpleFeature>, SimpleFeatureLocking, SimpleFeatureSource, SimpleFeatureStore

public class CSVFeatureStore
extends ContentFeatureStore

Read-write access to CSV File.

Author:

Jody Garnett (GeoCat), Ian Turton (Astun)

Nested Class Summary

Nested classes/interfaces inherited from interface FeatureLocking

FeatureLocking.Response

Field Summary

Fields inherited from class ContentFeatureStore

ORIGINAL_FEATURE_KEY, WRITER_ADD, WRITER_COMMIT, WRITER_UPDATE

Fields inherited from class ContentFeatureSource

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

Constructor Summary

Constructors

Constructor	Description
CSVFeatureStore(CSVStrategy csvStrategy, CSVFileState csvFileState, ContentEntry entry, Query query)

Method Summary

Modifier and Type	Method	Description
protected SimpleFeatureType	buildFeatureType()	Creates the feature type or schema for the feature source.
protected ReferencedEnvelope	getBoundsInternal(Query query)	Calculates the bounds of a specified query.
protected int	getCountInternal(Query query)	Calculates the number of features of a specified query.
CSVDataStore	getDataStore()	The datastore that this feature source originated from.
ContentEntry	getEntry()	The entry for the feature source.
ResourceInfo	getInfo()	A default ResourceInfo with a generic description.
Name	getName()	Returns the same name than the feature type (ie, getSchema().getName() to honor the simple feature land common practice of calling the same both the Features produces and their types
QueryCapabilities	getQueryCapabilities()	SimpleFeatureCollection optimized for read-only access.
protected FeatureReader<SimpleFeatureType,SimpleFeature>	getReaderInternal(Query query)	Subclass method for returning a native reader from the datastore.
ContentState	getState()	The current state for the feature source.
Transaction	getTransaction()	The current transaction the feature source is working against.
protected FeatureWriter<SimpleFeatureType,SimpleFeature>	getWriterInternal(Query query, int flags)	Subclass method for returning a native writer from the datastore.
void	setTransaction(Transaction transaction)	Sets the current transaction the feature source is working against.

Methods inherited from class ContentFeatureStore

addFeatures, addFeatures, getWriter, getWriter, getWriter, getWriter, modifyFeatures, modifyFeatures, modifyFeatures, modifyFeatures, modifyFeatures, modifyFeatures, removeFeatures, setFeatures

Methods inherited from class ContentFeatureSource

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

Methods inherited from class Object

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

Methods inherited from interface FeatureLocking

lockFeatures, lockFeatures, lockFeatures, setFeatureLock, unLockFeatures, unLockFeatures, unLockFeatures

Methods inherited from interface FeatureSource

addFeatureListener, getBounds, getBounds, getCount, getSchema, getSupportedHints, removeFeatureListener

Methods inherited from interface SimpleFeatureStore

getFeatures, getFeatures, getFeatures

Constructor Details

CSVFeatureStore

public CSVFeatureStore(CSVStrategy csvStrategy,
 CSVFileState csvFileState,
 ContentEntry entry,
 Query query)

Method Details

getWriterInternal

protected FeatureWriter<SimpleFeatureType,SimpleFeature> getWriterInternal(Query query,
 int flags)
                                                                    throws IOException

Description copied from class: ContentFeatureStore

Subclass method for returning a native writer from the datastore.

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

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

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

• ContentFeatureSource.canReproject()
• ContentFeatureSource.canFilter(Query)
• ContentFeatureSource.canEvent()
• ContentFeatureSource.canLimit(Query)
• ContentFeatureSource.canSort(Query)
• ContentFeatureSource.canLock()

Specified by:

getWriterInternal in class ContentFeatureStore

Parameters:

query - Query

flags - See ContentFeatureStore.WRITER_ADD and ContentFeatureStore.WRITER_UPDATE

Throws:

IOException

setTransaction

public void setTransaction(Transaction transaction)

Description copied from class: ContentFeatureSource

Sets the current transaction the feature source is working against.

transaction may be null. This signifies that the auto-commit transaction is used: Transaction.AUTO_COMMIT.

Specified by:

setTransaction in interface FeatureStore<SimpleFeatureType,SimpleFeature>

Overrides:

setTransaction in class ContentFeatureSource

Parameters:

transaction - The new transaction, or null.

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

getBoundsInternal

protected ReferencedEnvelope getBoundsInternal(Query query)
                                        throws IOException

Description copied from class: ContentFeatureSource

Calculates the bounds of a specified query. Subclasses must implement this method. If the computation is not fast, subclasses can return null.

Specified by:

getBoundsInternal 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

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(Query) - handles internally.</li> <li>{@link #canLimit(Query)} - handles {@link Query#getMaxFeatures()} and {@link Query#getStartIndex()} internally.</li> <li>{@link #canSort(Query)} - handles {@link Query#getSortBy()} natively.</li> <li>{@link #canRetype(Query)} - handles {@link Query#getProperties()} natively. Example would be only parsing the properties the user asks for from an XML file</li> <li>{@link #canLock()} - handles read-locks natively</li> <li>{@link #canTransact()} - handles transactions natively</li> </ul> </p>

Specified by:

getReaderInternal in class ContentFeatureSource

Throws:

IOException

getDataStore

public CSVDataStore getDataStore()

Description copied from class: ContentFeatureSource

The datastore that this feature source originated from.

Subclasses may wish to extend this method in order to type narrow its return type.

Specified by:

getDataStore in interface FeatureSource<SimpleFeatureType,SimpleFeature>

Overrides:

getDataStore in class ContentFeatureSource

Returns:

the data source providing this FeatureSource

getEntry

public ContentEntry getEntry()

Description copied from class: ContentFeatureSource

The entry for the feature source.

Overrides:

getEntry in class ContentFeatureSource

getTransaction

public Transaction getTransaction()

Description copied from class: ContentFeatureSource

The current transaction the feature source is working against.

This transaction is used to derive the state for the feature source. A null value for a transaction represents the auto commit transaction: Transaction.AUTO_COMMIT.

Specified by:

getTransaction in interface FeatureStore<SimpleFeatureType,SimpleFeature>

Overrides:

getTransaction in class ContentFeatureSource

Returns:

Transaction in use, or Transaction.AUTO_COMMIT

getState

public ContentState getState()

Description copied from class: ContentFeatureSource

The current state for the feature source.

This value is derived from current transaction of the feature source.

Overrides:

getState in class ContentFeatureSource

getInfo

public ResourceInfo getInfo()

Description copied from class: ContentFeatureSource

A default ResourceInfo with a generic description.

Subclasses should override to provide an explicit ResourceInfo object for their content.

Specified by:

getInfo in interface FeatureSource<SimpleFeatureType,SimpleFeature>

Overrides:

getInfo in class ContentFeatureSource

Returns:

description of features contents

getName

public Name getName()

Description copied from class: ContentFeatureSource

Returns the same name than the feature type (ie, getSchema().getName() to honor the simple feature land common practice of calling the same both the Features produces and their types

Specified by:

getName in interface FeatureSource<SimpleFeatureType,SimpleFeature>

Overrides:

getName in class ContentFeatureSource

Returns:

the name of the features accessible through this FeatureSource

See Also:

• FeatureSource.getName()

getQueryCapabilities

public QueryCapabilities getQueryCapabilities()

Description copied from class: ContentFeatureSource

SimpleFeatureCollection optimized for read-only access.

Available via getView( filter ):

• getFeatures().sort( sort )
• getFeatures( filter ).sort( sort )

In particular this method of data access is intended for rendering and other high speed operations; care should be taken to optimize the use of FeatureVisitor.

Specified by:

getQueryCapabilities in interface FeatureSource<SimpleFeatureType,SimpleFeature>

Overrides:

getQueryCapabilities in class ContentFeatureSource

Returns:

readonly access