Package org.geotools.data.memory

Class MemoryDataStore

Object

ContentDataStore

MemoryDataStore

All Implemented Interfaces:

DataAccess<SimpleFeatureType,SimpleFeature>, DataStore

public class MemoryDataStore
extends ContentDataStore

This is an example implementation of a DataStore used for testing.

It serves as an example implementation of:

• FeatureListenerManager use: allows handling of FeatureEvents

This class will also illustrate the use of In-Process locking when the time comes.

Author:

jgarnett

Field Summary

Fields inherited from class ContentDataStore

dataStoreFactory, entries, featureFactory, filterFactory, geometryFactory, JOINED_FEATURE_TYPE, lockingManager, LOGGER, namespaceURI, typeFactory, WRITER_ADD, WRITER_COMMIT, WRITER_UPDATE

Constructor Summary

Constructors

Constructor	Description
MemoryDataStore()
MemoryDataStore(FeatureReader<SimpleFeatureType,SimpleFeature> reader)
MemoryDataStore(SimpleFeature... array)
MemoryDataStore(SimpleFeatureType featureType)	Construct an MemoryDataStore around an empty collection of the provided SimpleFeatureType
MemoryDataStore(SimpleFeatureCollection collection)
MemoryDataStore(SimpleFeatureIterator reader)
MemoryDataStore(FeatureCollection<SimpleFeatureType,SimpleFeature> collection)

Method Summary

Modifier and Type	Method	Description
void	addFeature(SimpleFeature feature)	Adds a single Feature to the correct typeName entry.
void	addFeatures(Collection<?> collection)	Configures MemoryDataStore with Collection.
void	addFeatures(FeatureReader<SimpleFeatureType,SimpleFeature> reader)	Configures MemoryDataStore with FeatureReader.
void	addFeatures(SimpleFeature... features)	Configures MemoryDataStore with feature array.
void	addFeatures(SimpleFeatureIterator reader)	Configures MemoryDataStore with FeatureReader.
void	addFeatures(FeatureCollection<SimpleFeatureType,SimpleFeature> collection)
protected MemoryState	createContentState(ContentEntry entry)	Use MemoryState to manage internal storage.
protected ContentFeatureSource	createFeatureSource(ContentEntry entry)	Instantiates new feature source for the entry.
protected ContentFeatureSource	createFeatureSource(ContentEntry entry, Query query)
void	createSchema(SimpleFeatureType featureType)	Adds support for a new featureType to MemoryDataStore.
protected List<Name>	createTypeNames()	List of available types provided by this DataStore.
protected MemoryEntry	entry(String typeName)	Access MemoryState for typeName.
protected MemoryEntry	entry(SimpleFeatureType schema)	Access to entry to store content of the provided schema, will create new entry if needed.
void	removeSchema(String typeName)	Used to permanently remove a schema from the underlying storage
void	removeSchema(Name typeName)	Used to permanently remove a schema from the underlying storage

Methods inherited from class ContentDataStore

dispose, ensureEntry, ensureFeatureStore, entry, getDataStoreFactory, getEntry, getFeatureFactory, getFeatureReader, getFeatureSource, getFeatureSource, getFeatureSource, getFeatureSource, getFeatureTypeFactory, getFeatureWriter, getFeatureWriter, getFeatureWriterAppend, getFilterFactory, getGeometryFactory, getInfo, getLockingManager, getLogger, getNames, getNamespaceURI, getSchema, getSchema, getTypeNames, name, removeEntry, setDataStoreFactory, setFeatureFactory, setFeatureTypeFactory, setFilterFactory, setGeometryFactory, setNamespaceURI, updateSchema, updateSchema

Methods inherited from class Object

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

Constructor Details

MemoryDataStore

public MemoryDataStore()

MemoryDataStore

public MemoryDataStore(SimpleFeatureType featureType)

Construct an MemoryDataStore around an empty collection of the provided SimpleFeatureType

Parameters:

featureType - The initial feature type for the memory data store, an empty feature collection of this type will be made available

MemoryDataStore

public MemoryDataStore(FeatureCollection<SimpleFeatureType,SimpleFeature> collection)

MemoryDataStore

public MemoryDataStore(SimpleFeatureCollection collection)

MemoryDataStore

public MemoryDataStore(SimpleFeature... array)

MemoryDataStore

public MemoryDataStore(FeatureReader<SimpleFeatureType,SimpleFeature> reader)
                throws IOException

Throws:

IOException

MemoryDataStore

public MemoryDataStore(SimpleFeatureIterator reader)
                throws IOException

Throws:

IOException

Method Details

createContentState

protected MemoryState createContentState(ContentEntry entry)

Use MemoryState to manage internal storage.

Overrides:

createContentState in class ContentDataStore

Parameters:

entry - The entry.

Returns:

A new instance of ContentState for the entry.

addFeatures

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

Configures MemoryDataStore with FeatureReader.

Parameters:

reader - New contents to add

Throws:

IOException - If problems are encountered while adding

DataSourceException - See IOException

addFeatures

public void addFeatures(SimpleFeatureIterator reader)
                 throws IOException

Configures MemoryDataStore with FeatureReader.

Parameters:

reader - New contents to add

Throws:

IOException - If problems are encountered while adding

DataSourceException - See IOException

addFeatures

public void addFeatures(Collection<?> collection)

Configures MemoryDataStore with Collection.

You may use this to create a MemoryDataStore from a FeatureCollection.

Parameters:

collection - Collection of features to add

Throws:

IllegalArgumentException - If provided collection is empty

addFeatures

public void addFeatures(FeatureCollection<SimpleFeatureType,SimpleFeature> collection)

addFeatures

public void addFeatures(SimpleFeature... features)

Configures MemoryDataStore with feature array.

Parameters:

features - Array of features to add

Throws:

IllegalArgumentException - If provided feature array is empty

addFeature

public void addFeature(SimpleFeature feature)

Adds a single Feature to the correct typeName entry.

This is an internal operation used for setting up MemoryDataStore - please use FeatureWriter for general use.

This method is willing to create new FeatureTypes for MemoryDataStore.

Parameters:

feature - Individual feature to add

entry

protected MemoryEntry entry(String typeName)
                     throws IOException

Access MemoryState for typeName.

Technically this is accessing the MemoryState for Transaction.AUTO_COMMIT, which is the definitive storage for the feature content.

Returns:

MemoryState storing feature (by FeatureID)

Throws:

IOException - If typeName cannot be found

entry

protected MemoryEntry entry(SimpleFeatureType schema)
                     throws IOException

Access to entry to store content of the provided schema, will create new entry if needed.

Returns:

MemoryState used for content storage

Throws:

IOException - If new entry could not be created due to typeName conflict

createTypeNames

protected List<Name> createTypeNames()

List of available types provided by this DataStore.

Specified by:

createTypeNames in class ContentDataStore

Returns:

List of type names

See Also:

• org.geotools.data.ContentDataStore#getFeatureTypes()

createFeatureSource

protected ContentFeatureSource createFeatureSource(ContentEntry entry)

Description copied from class: ContentDataStore

Instantiates new feature source for the entry.

Subclasses should override this method to return a specific subclass of ContentFeatureSource.

Specified by:

createFeatureSource in class ContentDataStore

Parameters:

entry - The entry.

Returns:

An new instance of ContentFeatureSource for the entry.

createFeatureSource

protected ContentFeatureSource createFeatureSource(ContentEntry entry,
 Query query)

createSchema

public void createSchema(SimpleFeatureType featureType)
                  throws IOException

Adds support for a new featureType to MemoryDataStore.

FeatureTypes are stored by typeName, an IOException will be thrown if the requested typeName is already in use.

Specified by:

createSchema in interface DataAccess<SimpleFeatureType,SimpleFeature>

Overrides:

createSchema in class ContentDataStore

Parameters:

featureType - SimpleFeatureType to be added

Throws:

IOException - If featureType already exists

See Also:

• DataAccess.createSchema(org.geotools.feature.SimpleFeatureType)

removeSchema

public void removeSchema(String typeName)
                  throws IOException

Description copied from interface: DataStore

Used to permanently remove a schema from the underlying storage

This functionality is similar to an "drop table" statement in SQL. Implementation is optional; it may not be supported by all servers or files.

Specified by:

removeSchema in interface DataStore

Overrides:

removeSchema in class ContentDataStore

Throws:

IOException - if the operation failed

See Also:

• DataStore.removeSchema(String)

removeSchema

public void removeSchema(Name typeName)
                  throws IOException

Description copied from interface: DataAccess

Used to permanently remove a schema from the underlying storage

This functionality is similar to an "drop table" statement in SQL. Implementation is optional; it may not be supported by all servers or files.

Specified by:

removeSchema in interface DataAccess<SimpleFeatureType,SimpleFeature>

Overrides:

removeSchema in class ContentDataStore

Throws:

IOException - if the operation failed

See Also:

• DataAccess.removeSchema(Name)