Package org.geotools.jdbc

Class JDBCFeatureStore

Object

ContentFeatureSource

ContentFeatureStore

JDBCFeatureStore

All Implemented Interfaces:

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

public final class JDBCFeatureStore
extends ContentFeatureStore

FeatureStore implementation for jdbc based relational database tables.

All read only methods are delegated to JDBCFeatureSource.

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	Description
JDBCFeatureSource	delegate	jdbc feature source to delegate to, we do this b/c we can't inherit from both ContentFeatureStore and JDBCFeatureSource at the same time

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
JDBCFeatureStore(ContentEntry entry, Query query)	Creates the new feature store.

Method Summary

Modifier and Type	Method	Description
protected SimpleFeatureType	buildFeatureType()	Creates the feature type or schema for the feature source.
protected boolean	canEvent()	We handle events internally
protected boolean	canFilter(Query query)	Determines if the datastore can natively perform a filtering.
protected boolean	canLimit(Query query)	Determines if the datastore can natively limit the number of features returned in a query.
protected boolean	canOffset(Query query)	Determines if the datastore can natively skip the first offset number of features returned in a query.
protected boolean	canRetype(Query query)	Determines if the datastore can natively perform "retyping" which includes limiting the number of attributes returned and reordering of those attributes
protected boolean	canSort(Query query)	Determines if the datastore can natively perform sorting.
protected boolean	canTransact()	Determines if the store can natively manage transactions.
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.
JDBCDataStore	getDataStore()	The datastore that this feature source originated from.
ContentEntry	getEntry()	The entry for the feature source.
JDBCFeatureSource	getFeatureSource()
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
PrimaryKey	getPrimaryKey()
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.
JDBCState	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.
protected boolean	handleVisitor(Query query, FeatureVisitor visitor)	Subclass method which allows subclasses to natively handle a visitor.
boolean	isExposePrimaryKeyColumns()	The flag which will expose columns which compose a tables identifying or primary key, through feature type attributes.
void	modifyFeatures(Name[] names, Object[] values, Filter filter)	Modifies/updates the features of the store which match the specified filter.
void	removeFeatures(Filter filter)	Removes the features from the store which match the specified filter.
void	setExposePrimaryKeyColumns(boolean exposePrimaryKeyColumns)	Sets the flag which will expose columns which compose a tables identifying or primary key, through feature type attributes.
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, setFeatures

Methods inherited from class ContentFeatureSource

accepts, addFeatureListener, addHints, buildQueryCapabilities, canFilter, canLimit, canLock, canOffset, canReproject, canRetype, canSort, doLockInternal, doUnlockInternal, getAbsoluteSchema, getBounds, getBounds, getCount, getFeatures, getFeatures, getFeatures, getReader, getReader, getReader, getSchema, getSupportedHints, getView, getView, 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

Field Details

delegate

public JDBCFeatureSource delegate

jdbc feature source to delegate to, we do this b/c we can't inherit from both ContentFeatureStore and JDBCFeatureSource at the same time

Constructor Details

JDBCFeatureStore

public JDBCFeatureStore(ContentEntry entry,
 Query query)
                 throws IOException

Creates the new feature store.

Parameters:

entry - The datastore entry.

query - The defining query.

Throws:

IOException

Method Details

canEvent

protected boolean canEvent()

We handle events internally

Overrides:

canEvent in class ContentFeatureSource

Returns:

true if event notification has custom implementation

getDataStore

public JDBCDataStore 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

getFeatureSource

public JDBCFeatureSource getFeatureSource()

getEntry

public ContentEntry getEntry()

Description copied from class: ContentFeatureSource

The entry for the feature source.

Overrides:

getEntry 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

getState

public JDBCState 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

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

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.

getPrimaryKey

public PrimaryKey getPrimaryKey()

setExposePrimaryKeyColumns

public void setExposePrimaryKeyColumns(boolean exposePrimaryKeyColumns)

Sets the flag which will expose columns which compose a tables identifying or primary key, through feature type attributes.

Note: setting this flag which affect all feature sources created from or working against the current transaction.

isExposePrimaryKeyColumns

public boolean isExposePrimaryKeyColumns()

The flag which will expose columns which compose a tables identifying or primary key, through feature type attributes.

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

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

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

canFilter

protected boolean canFilter(Query query)

Description copied from class: ContentFeatureSource

Determines if the datastore can natively perform a filtering.

If the subclass can handle filtering natively it should override this method to return true. In this case it must do the filtering or throw an exception. This includes the case of partial native filtering where the datastore can only handle part of the filter natively. In these cases it is up to the subclass to apply a decorator to the reader it returns which will handle any part of the filter can was not applied natively. See FilteringFeatureReader.

Not overriding this method or returning false will cause the feature reader created by the subclass to be wrapped in a filtering feature reader when the query specifies a filter. See FilteringFeatureReader.

Overrides:

canFilter in class ContentFeatureSource

canSort

protected boolean canSort(Query query)

Description copied from class: ContentFeatureSource

Determines if the datastore can natively perform sorting.

If the subclass can handle retyping natively it should override this method to return true. In this case it must do the retyping or throw an exception.

Not overriding this method or returning false will cause an exception to be thrown when the query specifies sorting.

Overrides:

canSort in class ContentFeatureSource

See Also:

• SortedFeatureReader

canRetype

protected boolean canRetype(Query query)

Description copied from class: ContentFeatureSource

Determines if the datastore can natively perform "retyping" which includes limiting the number of attributes returned and reordering of those attributes

If the subclass can handle retyping natively it should override this method to return true. In this case it must do the retyping or throw an exception.

Not overriding this method or returning false will cause the feature reader created by the subclass to be wrapped in a retyping feature reader when the query specifies a retype.

Overrides:

canRetype in class ContentFeatureSource

See Also:

• ReTypeFeatureReader

canLimit

protected boolean canLimit(Query query)

Description copied from class: ContentFeatureSource

Determines if the datastore can natively limit the number of features returned in a query.

If the subclass can handle a map feature cap natively then it should override this method to return true . In this case it must do the cap or throw an exception.

Not overriding this method or returning false will case the feature reader created by the subclass to be wrapped in a max feature capping decorator when the query specifies a max feature cap.

Overrides:

canLimit in class ContentFeatureSource

See Also:

• MaxFeatureReader

canOffset

protected boolean canOffset(Query query)

Description copied from class: ContentFeatureSource

Determines if the datastore can natively skip the first offset number of features returned in a query.

If the subclass can handle a map feature cap natively then it should override this method to return true . In this case it must do the cap or throw an exception.

Not overriding this method or returning false will case the feature reader created by the subclass to be accessed offset times before being returned to the caller.

Overrides:

canOffset in class ContentFeatureSource

canTransact

protected boolean canTransact()

Description copied from class: ContentFeatureSource

Determines if the store can natively manage transactions.

If a subclass can handle transactions natively it should override this method to return true and deal with transactions on its own, including firing feature modifications events.

Overrides:

canTransact in class ContentFeatureSource

Returns:

true if transaction independence has custom implementation

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

handleVisitor

protected boolean handleVisitor(Query query,
 FeatureVisitor visitor)
                         throws IOException

Description copied from class: ContentFeatureSource

Subclass method which allows subclasses to natively handle a visitor.

Subclasses would override this method and return true in cases where the specific visitor could be handled without iterating over the entire result set of query. An example would be handling visitors that calculate aggregate values.

Overrides:

handleVisitor in class ContentFeatureSource

Parameters:

query - The query being made.

visitor - The visitor to

Returns:

true if the visitor can be handled natively, otherwise false.

Throws:

IOException

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

modifyFeatures

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

Description copied from class: ContentFeatureStore

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>

Overrides:

modifyFeatures in class ContentFeatureStore

Parameters:

names - the attributes to modify

values - 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

removeFeatures

public void removeFeatures(Filter filter)
                    throws IOException

Description copied from class: ContentFeatureStore

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>

Overrides:

removeFeatures in class ContentFeatureStore

Parameters:

filter - an OpenGIS filter

Throws:

IOException - if an error occurs modifying the data source