Package org.geotools.api.data

Class DataAccessFinder

Object

DataAccessFinder

public final class DataAccessFinder
extends Object

Enable programs to find all available DataAccess implementations, including the DataStore ones.

In order to be located by this finder datasources must provide an implementation of the DataAccessFactory interface.

In addition to implementing this interface datasouces should have a services file:
META-INF/services/org.geotools.api.data.DataAccessFactory

The file should contain a single line which gives the full name of the implementing class.

Example:
org.geotools.data.mytype.MyTypeDataAccessFacotry

Field Summary

Fields

Modifier and Type	Field	Description
protected static Logger	LOGGER	The logger for the filter module.

Method Summary

Modifier and Type	Method	Description
static Iterator<DataAccessFactory>	getAllDataStores()	Finds all implemtaions of DataAccessFactory which have registered using the services mechanism, regardless weather it has the appropriate libraries on the classpath.
static Iterator<DataAccessFactory>	getAvailableDataStores()	Finds all implemtaions of DataAccessFactory which have registered using the services mechanism, and that have the appropriate libraries on the classpath.
static DataAccess<FeatureType,Feature>	getDataStore(Map<String,?> params)	Checks each available datasource implementation in turn and returns the first one which claims to support the resource identified by the params object.
static void	reset()	Resets the factory finder and prepares for a new full scan of the SPI subsystems
static void	scanForPlugins()	Scans for factory plug-ins on the application class path.

Methods inherited from class Object

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

Field Detail

LOGGER

protected static final Logger LOGGER

The logger for the filter module.

Method Detail

getDataStore

public static DataAccess<FeatureType,Feature> getDataStore(Map<String,?> params)
                                                          throws IOException

Checks each available datasource implementation in turn and returns the first one which claims to support the resource identified by the params object.

Parameters:

params - A Map object which contains a defenition of the resource to connect to. for file based resources the property 'url' should be set within this Map.

Returns:

The first datasource which claims to process the required resource, returns null if none can be found.

Throws:

IOException - If a suitable loader can be found, but it can not be attached to the specified resource without errors.

getAllDataStores

public static Iterator<DataAccessFactory> getAllDataStores()

Finds all implemtaions of DataAccessFactory which have registered using the services mechanism, regardless weather it has the appropriate libraries on the classpath.

Returns:

An iterator over all discovered datastores which have registered factories

getAvailableDataStores

public static Iterator<DataAccessFactory> getAvailableDataStores()

Finds all implemtaions of DataAccessFactory which have registered using the services mechanism, and that have the appropriate libraries on the classpath.

Returns:

An iterator over all discovered datastores which have registered factories, and whose available method returns true.

scanForPlugins

public static void scanForPlugins()

Scans for factory plug-ins on the application class path. This method is needed because the application class path can theoretically change, or additional plug-ins may become available. Rather than re-scanning the classpath on every invocation of the API, the class path is scanned automatically only on the first invocation. Clients can call this method to prompt a re-scan. Thus this method need only be invoked by sophisticated applications which dynamically make new plug-ins available at runtime.

reset

public static void reset()

Resets the factory finder and prepares for a new full scan of the SPI subsystems