org.gvsig.fmap.dal

Interface DataStore

All Superinterfaces:

ComplexObservable, ComplexWeakReferencingObservable, Disposable, DynObject, Metadata, Observable, Persistent, Visitable, WeakReferencingObservable

All Known Subinterfaces:

CoverageStore, CoverageStoreProviderServices, FeatureStore, FeatureStore, RasterDataStore

All Known Implementing Classes:

AbstractRasterDataStore, DefaultCoverageStore, DefaultFeatureStore, DefaultRasterStore, DefaultRemoteRasterStore

public interface DataStore
extends ComplexWeakReferencingObservable, Persistent, Metadata, Disposable, Visitable

This is the basic interface for all data stores. Depending on the context, it can represent a geographic layer, an alphanumeric database table or any data file. DataStore offers generic services like:

• Open and close data stores
• Access to data sets, with the possibility of loading data in background.
• Use of selection and locks, as well as data sets
• Editing
• Register event observers through the Observable interface
• Access to embedded data stores (like GML)
• Information about the Spatial Reference Systems used by the data store

Field Summary

Fields

Modifier and Type	Field and Description
static String	FEATURE_METADATA_DEFINITION_NAME
static String	METADATA_CONTAINERNAME Metadata property name for Container name provided by the data provider.
static String	METADATA_CRS Metadata property name for CRS provided by the data provider.
static String	METADATA_DEFINITION_NAME
static String	METADATA_ENVELOPE Metadata property name for Envelope provided by the data provider This metadata is only provided by data provider with spatial information.
static String	METADATA_FEATURETYPE Metadata property name for the feature type provided by the data provider.
static String	METADATA_PROVIDER Metadata property name for the provider name provided by the data provider.
static String	SPATIAL_METADATA_DEFINITION_NAME

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(Visitor visitor) Provides each value of this Store to the provided Visitor.
void	accept(Visitor visitor, DataQuery dataQuery) Provides each value of this Store to the provided Visitor.
DataQuery	createQuery() Returns a new instance of a DataQuery.
DataSet	createSelection() Creates a new selection.
Iterator	getChildren() Returns an iterator over this store children
DataSet	getDataSet() Returns all available data.
DataSet	getDataSet(DataQuery dataQuery) Returns a subset of data taking into account the properties and restrictions of the DataQuery.
void	getDataSet(DataQuery dataQuery, Observer observer) Loads a subset of data taking into account the properties and restrictions of the DataQuery.
void	getDataSet(Observer observer) Loads all available data and notifies the observer for each loaded block of data.
DataServerExplorer	getExplorer() Returns the DataServerExplorer to which this DataStore belongs, if there is any.
String	getFullName() Returns a more descriptive name for the store that getName.
Interval	getInterval() Gets the Interval of the store, that means the temporal interval where the store has valid data.
String	getName() Returns the name associated to the store.
DataStoreParameters	getParameters() Return the of parameters of this store
String	getProviderName() Return the provider name that use this store.
DataSet	getSelection() Returns the selected set of data
Collection	getTimes() Gets all the possible values of time for which the store has data.
Collection	getTimes(Interval interval) Gets all the possible values of time for which the store has data and intersects with an interval.
void	refresh() Refreshes this store state.
void	setSelection(DataSet selection) Sets the current data selection with the given data set.

Methods inherited from interface org.gvsig.tools.observer.ComplexObservable

beginComplexNotification, disableNotifications, enableNotifications, endComplexNotification

Methods inherited from interface org.gvsig.tools.observer.Observable

addObserver, deleteObserver, deleteObservers

Methods inherited from interface org.gvsig.tools.persistence.Persistent

loadFromState, saveToState

Methods inherited from interface org.gvsig.metadata.Metadata

getMetadataChildren, getMetadataID, getMetadataName

Methods inherited from interface org.gvsig.tools.dynobject.DynObject

clear, delegate, getDynClass, getDynValue, hasDynValue, implement, invokeDynMethod, invokeDynMethod, setDynValue

Methods inherited from interface org.gvsig.tools.dispose.Disposable

dispose

Field Detail

METADATA_DEFINITION_NAME

static final String METADATA_DEFINITION_NAME

See Also:

Constant Field Values

FEATURE_METADATA_DEFINITION_NAME

static final String FEATURE_METADATA_DEFINITION_NAME

See Also:

Constant Field Values

SPATIAL_METADATA_DEFINITION_NAME

static final String SPATIAL_METADATA_DEFINITION_NAME

See Also:

Constant Field Values

METADATA_PROVIDER

static final String METADATA_PROVIDER

Metadata property name for the provider name provided by the data provider. This metadata is provided by all data providers.

See Also:

Constant Field Values

METADATA_CONTAINERNAME

static final String METADATA_CONTAINERNAME

Metadata property name for Container name provided by the data provider. By explample, in a dbf file, this is the name of dbf. This metadata is provided by all data providers.

See Also:

Constant Field Values

METADATA_FEATURETYPE

static final String METADATA_FEATURETYPE

Metadata property name for the feature type provided by the data provider. This metadata is provided by all tabular data providers.

See Also:

Constant Field Values

METADATA_CRS

static final String METADATA_CRS

Metadata property name for CRS provided by the data provider. This metadata is only provided by data provider with spatial information.

See Also:

Constant Field Values

METADATA_ENVELOPE

static final String METADATA_ENVELOPE

Metadata property name for Envelope provided by the data provider This metadata is only provided by data provider with spatial information.

See Also:

Constant Field Values

Method Detail

getName

String getName()

Returns the name associated to the store. This name is provided for informational purposes only. Explamples: In a dbf the filename without the path In a DDBB table the name of the table In a WFS layer the name of the layer.

Returns:

String containing this store's name.

getFullName

String getFullName()

Returns a more descriptive name for the store that getName. This name is provided for informational purposes only. Explamples: In a file based store may return the full name of the filename, path and filename. In a data base based store may return "server:dbname:tablename" In a WFS layer based store may return "server:layername"

Returns:

String Containing the full name of the store

getParameters

DataStoreParameters getParameters()

Return the of parameters of this store

Returns:

parameters of this store

getProviderName

String getProviderName()

Return the provider name that use this store.

Returns:

provider name of this store

refresh

void refresh()
             throws DataException

Refreshes this store state.

Throws:

DataException

getDataSet

DataSet getDataSet()
                   throws DataException

Returns all available data.

Returns:

a set of data

Throws:

DataException - if there is any error while loading the data

getDataSet

DataSet getDataSet(DataQuery dataQuery)
                   throws DataException

Returns a subset of data taking into account the properties and restrictions of the DataQuery.

Parameters:

dataQuery - defines the properties of the requested data

Returns:

a set of data

Throws:

DataException - if there is any error while loading the data

accept

void accept(Visitor visitor)
            throws BaseException

Provides each value of this Store to the provided Visitor. The values received through the Visitor.visit(Object) method may be transient, reused or externally modifiable, so they can't be used to be stored in any external form out of the visit method. If you need to store any of the values out of the Visitor.visit(Object) method execution, create a copy or clone the received value in order to be stored.

Specified by:

accept in interface Visitable

Parameters:

visitor - the visitor to apply to each value.

Throws:

BaseException - if there is an error while performing the visit

accept

void accept(Visitor visitor,
          DataQuery dataQuery)
            throws BaseException

Provides each value of this Store to the provided Visitor. The values received through the Visitor.visit(Object) method may be transient, reused or externally modifiable, so they can't be used to be stored in any external form out of the visit method. If you need to store any of the values out of the Visitor.visit(Object) method execution, create a copy or clone the received value in order to be stored.

Parameters:

visitor - the visitor to apply to each value.

dataQuery - defines the properties of the data to visit

Throws:

BaseException - if there is an error while performing the visit

getDataSet

void getDataSet(Observer observer)
                throws DataException

Loads all available data and notifies the observer for each loaded block of data.

Parameters:

observer - to be notified for each block of data loaded

Throws:

DataException - if there is any error while loading the data

getDataSet

void getDataSet(DataQuery dataQuery,
              Observer observer)
                throws DataException

Loads a subset of data taking into account the properties and restrictions of the DataQuery. Data loading is performed by calling the Observer, once each data block is loaded.

Parameters:

dataQuery - defines the properties of the requested data

observer - to be notified for each block of data loaded

Throws:

DataException - if there is any error while loading the data

getSelection

DataSet getSelection()
                     throws DataException

Returns the selected set of data

Returns:

DataSet

Throws:

DataException

setSelection

void setSelection(DataSet selection)
                  throws DataException

Sets the current data selection with the given data set.

Parameters:

DataSet - selection

Throws:

DataException

createSelection

DataSet createSelection()
                        throws DataException

Creates a new selection.

Returns:

DataSet that contains the selection

Throws:

DataException

getChildren

Iterator getChildren()

Returns an iterator over this store children

Returns:

Iterator over this DataStore children

getExplorer

DataServerExplorer getExplorer()
                               throws DataException,
                                      ValidateDataParametersException

Returns the DataServerExplorer to which this DataStore belongs, if there is any.

Returns:

DataServerExplorer to which this DataStore belongs, or null if this was not accessed through any DataServerExplorer.

Throws:

DataException

ValidateDataParametersException

createQuery

DataQuery createQuery()

Returns a new instance of a DataQuery.

Returns:

new DataQuery instance.

Throws:

DataException

getInterval

Interval getInterval()

Gets the Interval of the store, that means the temporal interval where the store has valid data.

Returns:

a time interval or null if there is not time support

getTimes

Collection getTimes()

Gets all the possible values of time for which the store has data.

Returns:

a collection of Time objects.

getTimes

Collection getTimes(Interval interval)

Gets all the possible values of time for which the store has data and intersects with an interval.

Parameters:

interval - the interval of time

Returns:

a collection of Time objects.