org.geotools.data.gen

Class PreGeneralizedDataStore

Object

PreGeneralizedDataStore

All Implemented Interfaces:

DataAccess<SimpleFeatureType,SimpleFeature>, DataStore

public class PreGeneralizedDataStore
extends Object
implements DataStore

Author:

Christian Mueller

Datastore for multiple feature types with pregeneralized geometries

The data store is read only, all modifying methods throw an UnsupportedOperationException

This data store does business as usual with the following exception:

If a method has a Query parameter and Query.getHints() includes Hints.GEOMETRY_DISTANCE with a given distance, the datastore looks for the best fit pregeneralized geometries and returns these geometries instead of the original ones.

This process results in a lower memory usage, lower cpu usage for further processing and will decrease response time for the user.

Constructor Summary

Constructors

Constructor and Description
PreGeneralizedDataStore(GeneralizationInfos infos, Repository repository)
PreGeneralizedDataStore(GeneralizationInfos infos, Repository repository, URI namespace)

Method Summary

Modifier and Type	Method and Description
void	createSchema(SimpleFeatureType featureType) Creates storage for a new featureType.
void	dispose() Disposes of this data store and releases any resource that it is using.
FeatureReader<SimpleFeatureType,SimpleFeature>	getFeatureReader(Query query, Transaction transaction) Gets a FeatureReader for features selected by the given Query.
SimpleFeatureSource	getFeatureSource(Name typeName) Gets a SimpleFeatureSource for features of the type specified by a qualified name (namespace plus type name).
SimpleFeatureSource	getFeatureSource(String typeName) Gets a SimpleFeatureSource for features of the specified type.
FeatureWriter<SimpleFeatureType,SimpleFeature>	getFeatureWriter(String typeName, Filter filter, Transaction transaction) Gets a FeatureWriter to modify features in this DataStore.
FeatureWriter<SimpleFeatureType,SimpleFeature>	getFeatureWriter(String typeName, Transaction transaction) Gets a FeatureWriter to modify features in this DataStore.
FeatureWriter<SimpleFeatureType,SimpleFeature>	getFeatureWriterAppend(String typeName, Transaction transaction) Gets a FeatureWriter that can add new features to the DataStore.
ServiceInfo	getInfo() Information about this service.
LockingManager	getLockingManager() Retrieve a per featureID based locking service from this DataStore.
List<Name>	getNames() Names of the available Resources.
URI	getNamespace()
SimpleFeatureType	getSchema(Name name) Description of the named resource.
SimpleFeatureType	getSchema(String typeName) Gets the type information (schema) for the specified feature type.
String[]	getTypeNames() Gets the names of feature types available in this DataStore.
void	removeSchema(Name typeName) Used to permanently remove a schema from the underlying storage This functionality is similar to an "drop table" statement in SQL.
void	removeSchema(String typeName) Used to permanently remove a schema from the underlying storage This functionality is similar to an "drop table" statement in SQL.
void	updateSchema(Name typeName, SimpleFeatureType featureType) Used to update a schema in place.
void	updateSchema(String typeName, SimpleFeatureType featureType) Applies a new schema to the given feature type.

Methods inherited from class Object

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

Constructor Detail

PreGeneralizedDataStore

public PreGeneralizedDataStore(GeneralizationInfos infos,
                               Repository repository)

Parameters:

infos -

repository -

PreGeneralizedDataStore

public PreGeneralizedDataStore(GeneralizationInfos infos,
                               Repository repository,
                               URI namespace)

Parameters:

infos -

repository -

namespace -

Method Detail

getNamespace

public URI getNamespace()

getFeatureReader

public FeatureReader<SimpleFeatureType,SimpleFeature> getFeatureReader(Query query,
                                                                       Transaction transaction)
                                                                throws IOException

Description copied from interface: DataStore

Gets a FeatureReader for features selected by the given Query. FeatureReader provies an iterator-style API to feature data.

The Query provides the schema for the form of the returned features as well as a Filter to constrain the features available via the reader.

The Transaction can be used to externalize the state of the DataStore. Examples of this include a JDBCDataStore sharing a connection for use across several FeatureReader requests; and a ShapefileDataStore redirecting requests to an alternate file during the course of a Transaction.

Specified by:

getFeatureReader in interface DataStore

Parameters:

query - a query providing the schema and constraints for features that the reader will return

transaction - a transaction that this reader will operate against

Returns:

an instance of FeatureReader

Throws:

IOException - if data access errors occur

getFeatureSource

public SimpleFeatureSource getFeatureSource(String typeName)
                                     throws IOException

Description copied from interface: DataStore

Gets a SimpleFeatureSource for features of the specified type. SimpleFeatureSource provides a high-level API for feature operations.

The resulting SimpleFeatureSource may implment more functionality as in this example:

 SimpleFeatureSource fsource = dataStore.getFeatureSource("roads");
 if (fsource instanceof SimpleFeatureStore) {
     // we have write access to the feature data
     SimpleFeatureStore fstore = (SimpleFeatureStore) fs;
 }
 else {
     // System.out.println("We do not have write access to roads");
 }
 

Specified by:

getFeatureSource in interface DataStore

Parameters:

typeName - the feature type

Returns:

a SimpleFeatureSource (or possibly a subclass) providing operations for features of the specified type

Throws:

IOException - if data access errors occur

See Also:

SimpleFeatureSource, SimpleFeatureStore

getFeatureWriter

public FeatureWriter<SimpleFeatureType,SimpleFeature> getFeatureWriter(String typeName,
                                                                       Transaction transaction)
                                                                throws IOException

Description copied from interface: DataStore

Gets a FeatureWriter to modify features in this DataStore. FeatureWriter provides an iterator style API to features.

The returned writer does not allow features to be added.

Specified by:

getFeatureWriter in interface DataStore

Parameters:

typeName - the type name for features that will be accessible

transaction - the transation that the returned writer operates against

Returns:

an instance of FeatureWriter

Throws:

IOException - if data access errors occur

See Also:

DataStore.getFeatureWriterAppend(String, Transaction)

getFeatureWriter

public FeatureWriter<SimpleFeatureType,SimpleFeature> getFeatureWriter(String typeName,
                                                                       Filter filter,
                                                                       Transaction transaction)
                                                                throws IOException

Description copied from interface: DataStore

Gets a FeatureWriter to modify features in this DataStore. FeatureWriter provides an iterator style API to features.

The returned writer does not allow features to be added.

Specified by:

getFeatureWriter in interface DataStore

Parameters:

typeName - the type name for features that will be accessible

filter - defines additional constraints on the features that will be accessible

transaction - the transation that the returned writer operates against

Returns:

an instance of FeatureWriter

Throws:

IOException - if data access errors occur

See Also:

DataStore.getFeatureWriterAppend(String, Transaction)

getFeatureWriterAppend

public FeatureWriter<SimpleFeatureType,SimpleFeature> getFeatureWriterAppend(String typeName,
                                                                             Transaction transaction)
                                                                      throws IOException

Description copied from interface: DataStore

Gets a FeatureWriter that can add new features to the DataStore.

The FeatureWriter will return false when its hasNext() method is called, but next() can be used to acquire new features.

Specified by:

getFeatureWriterAppend in interface DataStore

Parameters:

typeName - name of the feature type for which features will be added

transaction - the transaction to operate against

Returns:

an instance of FeatureWriter that can only be used to append new features

Throws:

IOException - if data access errors occur

getLockingManager

public LockingManager getLockingManager()

Description copied from interface: DataStore

Retrieve a per featureID based locking service from this DataStore.

Specified by:

getLockingManager in interface DataStore

Returns:

an instance of LockingManager; or null if locking is handled by the DataStore in a different fashion

getSchema

public SimpleFeatureType getSchema(String typeName)
                            throws IOException

Description copied from interface: DataStore

Gets the type information (schema) for the specified feature type.

Specified by:

getSchema in interface DataStore

Parameters:

typeName - the feature type name

Returns:

the requested feature type

Throws:

IOException - if typeName is not available

getTypeNames

public String[] getTypeNames()
                      throws IOException

Description copied from interface: DataStore

Gets the names of feature types available in this DataStore. Please note that this is not guaranteed to return a list of unique names since the same unqualified name may be present in separate namespaces within the DataStore.

Specified by:

getTypeNames in interface DataStore

Returns:

names of feature types available in this DataStore

Throws:

IOException - if data access errors occur

updateSchema

public void updateSchema(String typeName,
                         SimpleFeatureType featureType)
                  throws IOException

Description copied from interface: DataStore

Applies a new schema to the given feature type. This can be used to add or remove properties. The resulting update will be persistent.

Specified by:

updateSchema in interface DataStore

Parameters:

typeName - name of the feature type to update

featureType - the new schema to apply

Throws:

IOException - on error

createSchema

public void createSchema(SimpleFeatureType featureType)
                  throws IOException

Description copied from interface: DataAccess

Creates storage for a new featureType.

The provided featureType we be accessable by the typeName provided by featureType.getTypeName().

Specified by:

createSchema in interface DataAccess<SimpleFeatureType,SimpleFeature>

Parameters:

featureType - FetureType to add to DataStore

Throws:

IOException - If featureType cannot be created

dispose

public void dispose()

Description copied from interface: DataAccess

Disposes of this data store and releases any resource that it is using.

A DataStore cannot be used after dispose has been called, neither can any data access object it helped create, such as FeatureReader, FeatureSource or FeatureCollection.

This operation can be called more than once without side effects.

There is no thread safety assurance associated with this method. For example, client code will have to make sure this method is not called while retrieving/saving data from/to the storage, or be prepared for the consequences.

Specified by:

dispose in interface DataAccess<SimpleFeatureType,SimpleFeature>

getFeatureSource

public SimpleFeatureSource getFeatureSource(Name typeName)
                                     throws IOException

Description copied from interface: DataStore

Gets a SimpleFeatureSource for features of the type specified by a qualified name (namespace plus type name).

Specified by:

getFeatureSource in interface DataAccess<SimpleFeatureType,SimpleFeature>

Specified by:

getFeatureSource in interface DataStore

Parameters:

typeName - the qualified name of the feature type

Returns:

a SimpleFeatureSource (or possibly a subclass) providing operations for features of the specified type

Throws:

IOException - if data access errors occur

See Also:

DataStore.getFeatureSource(String), SimpleFeatureSource, SimpleFeatureStore

getInfo

public ServiceInfo getInfo()

Description copied from interface: DataAccess

Information about this service.

This method offers access to a summary of header or metadata information describing the service. Subclasses may return a specific ServiceInfo instance that has additional information (such as FilterCapabilities).

Specified by:

getInfo in interface DataAccess<SimpleFeatureType,SimpleFeature>

Returns:

SeviceInfo

getNames

public List<Name> getNames()
                    throws IOException

Description copied from interface: DataAccess

Names of the available Resources.

For additional information please see getInfo( Name ) and getSchema( Name ).

Specified by:

getNames in interface DataAccess<SimpleFeatureType,SimpleFeature>

Returns:

Names of the available contents.

Throws:

IOException

getSchema

public SimpleFeatureType getSchema(Name name)
                            throws IOException

Description copied from interface: DataAccess

Description of the named resource.

The FeatureType returned describes the contents being published. For additional metadata please review getInfo( Name ).

Specified by:

getSchema in interface DataAccess<SimpleFeatureType,SimpleFeature>

Parameters:

name - Type name a the resource from getNames()

Returns:

Description of the FeatureType being made avaialble

Throws:

IOException

updateSchema

public void updateSchema(Name typeName,
                         SimpleFeatureType featureType)
                  throws IOException

Description copied from interface: DataAccess

Used to update a schema in place.

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

Specified by:

updateSchema in interface DataAccess<SimpleFeatureType,SimpleFeature>

Throws:

IOException - if the operation failed

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>

Throws:

IOException - if the operation failed

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

Throws:

IOException - if the operation failed