org.geotools.data.store

Class ContentFeatureStore

Object

ContentFeatureSource

ContentFeatureStore

All Implemented Interfaces:

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

Direct Known Subclasses:

CSVFeatureStore, GeoJSONFeatureStore, JDBCFeatureStore, MemoryFeatureStore, MongoFeatureStore, PropertyFeatureStore

public abstract class ContentFeatureStore
extends ContentFeatureSource
implements SimpleFeatureStore, SimpleFeatureLocking

Abstract implementation of FeatureStore.

List its base class ContentFeatureSource, this feature store works off of operations provided by FeatureCollection.

The #addFeatures(SimpleFeatureCollection) method is used to add features to the feature store. The method should return the "persistent" feature id's which are generated after the feature has been added to persistent storage. Often the persistent fid is different from the fid specified by the actual feature being inserted. For this reason Property.getUserData() is used to report back persistent fids. It is up to the implementor of the feature collection to report this value back after a feature has been inserted. As an example, consider an implementation of FeatureCollection#add(Object).

  boolean add( Object o ) {
    SimpleFeature feature = (SimpleFeature) o;

    //1.add the feature to storage
    ...

    //2. derive the persistent fid
    String fid = ...;

    //3. set the user data
    feature.getUserData().put( "fid", fid );

  }
 

Author:

Justin Deoliveira, The Open Planning Project

Nested Class Summary

Nested classes/interfaces inherited from interface FeatureLocking

FeatureLocking.Response

Field Summary

Fields

Modifier and Type	Field and Description
static String	ORIGINAL_FEATURE_KEY
protected int	WRITER_ADD Flag writer for adding new content
protected int	WRITER_COMMIT Flag writer for commit (AUTO_COMMIT with no events)
protected int	WRITER_UPDATE Flag writer for updating content in place

Fields inherited from class ContentFeatureSource

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

Constructor Summary

Constructors

Constructor and Description
ContentFeatureStore(ContentEntry entry, Query query) Creates the content feature store.

Method Summary

Modifier and Type	Method and Description
List<FeatureId>	addFeatures(Collection collection) Adds a collection of features to the store.
List<FeatureId>	addFeatures(FeatureCollection<SimpleFeatureType,SimpleFeature> featureCollection) Adds a collection of features to the store.
FeatureWriter<SimpleFeatureType,SimpleFeature>	getWriter(Filter filter) Returns a writer over features specified by a filter.
FeatureWriter<SimpleFeatureType,SimpleFeature>	getWriter(Filter filter, int flags) Returns a writer over features specified by a filter.
FeatureWriter<SimpleFeatureType,SimpleFeature>	getWriter(Query query) Returns a writer over features specified by a query.
FeatureWriter<SimpleFeatureType,SimpleFeature>	getWriter(Query query, int flags) Returns a writer over features specified by a query.
protected abstract FeatureWriter<SimpleFeatureType,SimpleFeature>	getWriterInternal(Query query, int flags) Subclass method for returning a native writer from the datastore.
void	modifyFeatures(AttributeDescriptor[] type, Object[] value, Filter filter)
void	modifyFeatures(AttributeDescriptor type, Object value, Filter filter) Calls through to modifyFeatures(Name[], Object[], Filter).
void	modifyFeatures(Name[] type, Object[] value, Filter filter) Modifies/updates the features of the store which match the specified filter.
void	modifyFeatures(Name name, Object value, Filter filter) Calls through to modifyFeatures(Name[], Object[], Filter).
void	modifyFeatures(String[] names, Object[] values, Filter filter)
void	modifyFeatures(String name, Object attributeValue, Filter filter)
void	removeFeatures(Filter filter) Removes the features from the store which match the specified filter.
void	setFeatures(FeatureReader<SimpleFeatureType,SimpleFeature> reader) Sets the feature of the source.

Methods inherited from class ContentFeatureSource

accepts, addFeatureListener, addHints, buildFeatureType, buildQueryCapabilities, canEvent, canFilter, canLimit, canLock, canOffset, canReproject, canRetype, canSort, canTransact, doLockInternal, doUnlockInternal, getAbsoluteSchema, getBounds, getBounds, getBoundsInternal, getCount, getCountInternal, getDataStore, getEntry, getFeatures, getFeatures, getFeatures, getInfo, getName, getQueryCapabilities, getReader, getReader, getReader, getReaderInternal, 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

Methods inherited from interface SimpleFeatureStore

getFeatures, getFeatures, getFeatures

Methods inherited from interface FeatureLocking

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

Methods inherited from interface FeatureStore

getTransaction, setTransaction

Methods inherited from interface FeatureSource

addFeatureListener, getBounds, getBounds, getCount, getDataStore, getInfo, getName, getQueryCapabilities, getSchema, getSupportedHints, removeFeatureListener

Field Detail

WRITER_ADD

protected final int WRITER_ADD

Flag writer for adding new content

See Also:

Constant Field Values

WRITER_UPDATE

protected final int WRITER_UPDATE

Flag writer for updating content in place

See Also:

Constant Field Values

WRITER_COMMIT

protected final int WRITER_COMMIT

Flag writer for commit (AUTO_COMMIT with no events)

See Also:

Constant Field Values

ORIGINAL_FEATURE_KEY

public static final String ORIGINAL_FEATURE_KEY

See Also:

Constant Field Values

Constructor Detail

ContentFeatureStore

public ContentFeatureStore(ContentEntry entry,
                           Query query)

Creates the content feature store.

Parameters:

entry - The entry for the feature store.

query - The defining query.

Method Detail

getWriter

public final FeatureWriter<SimpleFeatureType,SimpleFeature> getWriter(Filter filter)
                                                               throws IOException

Returns a writer over features specified by a filter.

Parameters:

filter - The filter

Throws:

IOException

getWriter

public final FeatureWriter<SimpleFeatureType,SimpleFeature> getWriter(Filter filter,
                                                                      int flags)
                                                               throws IOException

Returns a writer over features specified by a filter.

Parameters:

filter - The filter

flags - flags specifying writing mode

Throws:

IOException

getWriter

public final FeatureWriter<SimpleFeatureType,SimpleFeature> getWriter(Query query)
                                                               throws IOException

Returns a writer over features specified by a query.

Parameters:

query - The query

Throws:

IOException

getWriter

public final FeatureWriter<SimpleFeatureType,SimpleFeature> getWriter(Query query,
                                                                      int flags)
                                                               throws IOException

Returns a writer over features specified by a query.

Parameters:

query - The query

flags - flags specifying writing mode

Throws:

IOException

getWriterInternal

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

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()
• ContentFeatureSource.canEvent()
• ContentFeatureSource.canLimit()
• ContentFeatureSource.canSort()
• ContentFeatureSource.canLock()

Parameters:

query - Query

flags - See WRITER_ADD and WRITER_UPDATE

Throws:

IOException

addFeatures

public List<FeatureId> addFeatures(Collection collection)
                            throws IOException

Adds a collection of features to the store.

This method operates by getting an appending feature writer and writing all the features in collection to it. Directly after a feature is written its id is obtained and added to the returned set.

Throws:

IOException

addFeatures

public List<FeatureId> addFeatures(FeatureCollection<SimpleFeatureType,SimpleFeature> featureCollection)
                            throws IOException

Adds a collection of features to the store.

Specified by:

addFeatures in interface FeatureStore<SimpleFeatureType,SimpleFeature>

Parameters:

featureCollection - the collection of features to add

Returns:

the FeatureIds of the newly added features

Throws:

IOException - if an error occurs modifying the data source

setFeatures

public final void setFeatures(FeatureReader<SimpleFeatureType,SimpleFeature> reader)
                       throws IOException

Sets the feature of the source.

This method operates by first clearing the contents of the feature store (removeFeatures(Filter)), and then obtaining an appending feature writer and writing all features from reader to it.

Specified by:

setFeatures in interface FeatureStore<SimpleFeatureType,SimpleFeature>

Parameters:

reader - - the collection to be written

Throws:

IOException - if there are any datasource errors.

modifyFeatures

public void modifyFeatures(AttributeDescriptor[] type,
                           Object[] value,
                           Filter filter)
                    throws IOException

Throws:

IOException

modifyFeatures

public void modifyFeatures(Name[] type,
                           Object[] value,
                           Filter filter)
                    throws IOException

Modifies/updates the features of the store which match the specified filter.

This method operates by obtaining an updating feature writer based on the specified filter and writing the updated values to it.

The filter must not be null, in this case this method will throw an IllegalArgumentException.

Specified by:

modifyFeatures in interface FeatureStore<SimpleFeatureType,SimpleFeature>

Parameters:

type - the attributes to modify

value - the new values for the attributes

filter - an OpenGIS filter

Throws:

IOException - if the attribute and object arrays are not equal in length; if the value types do not match the attribute types; if modification is not supported; or if there errors accessing the data source

modifyFeatures

public final void modifyFeatures(String name,
                                 Object attributeValue,
                                 Filter filter)
                          throws IOException

Specified by:

modifyFeatures in interface SimpleFeatureStore

Throws:

IOException

modifyFeatures

public final void modifyFeatures(String[] names,
                                 Object[] values,
                                 Filter filter)
                          throws IOException

Specified by:

modifyFeatures in interface SimpleFeatureStore

Throws:

IOException

modifyFeatures

public final void modifyFeatures(AttributeDescriptor type,
                                 Object value,
                                 Filter filter)
                          throws IOException

Calls through to modifyFeatures(Name[], Object[], Filter).

Throws:

IOException

modifyFeatures

public final void modifyFeatures(Name name,
                                 Object value,
                                 Filter filter)
                          throws IOException

Calls through to modifyFeatures(Name[], Object[], Filter).

Specified by:

modifyFeatures in interface FeatureStore<SimpleFeatureType,SimpleFeature>

Parameters:

name - the attribute to modify

value - the new value for the attribute

filter - an OpenGIS filter

Throws:

IOException - if modification is not supported; if the value type does not match the attribute type; or if there errors accessing the data source

removeFeatures

public void removeFeatures(Filter filter)
                    throws IOException

Removes the features from the store which match the specified filter.

This method operates by obtaining an updating feature writer based on the specified filter and removing every feature from it.

The filter must not be null, in this case this method will throw an IllegalArgumentException.

Specified by:

removeFeatures in interface FeatureStore<SimpleFeatureType,SimpleFeature>

Parameters:

filter - an OpenGIS filter

Throws:

IOException - if an error occurs modifying the data source