org.geotools.data.geojson

Class GeoJSONDataStoreFactory

Object

GeoJSONDataStoreFactory

All Implemented Interfaces:

DataAccessFactory, DataStoreFactorySpi, FileDataStoreFactorySpi, Factory

public class GeoJSONDataStoreFactory
extends Object
implements FileDataStoreFactorySpi

Nested Class Summary

Nested classes/interfaces inherited from interface DataAccessFactory

DataAccessFactory.Param

Field Summary

Fields

Modifier and Type	Field and Description
static DataAccessFactory.Param	BOUNDING_BOX
static DataAccessFactory.Param	FILE_PARAM Parameter description of information required to connect
static DataAccessFactory.Param	QUICK_SCHEMA
static DataAccessFactory.Param	URL_PARAM
static DataAccessFactory.Param	WRITE_BOUNDS

Constructor Summary

Constructors

Constructor and Description
GeoJSONDataStoreFactory()

Method Summary

Modifier and Type	Method and Description
boolean	canProcess(Map<String,?> params) Test to see if this factory is suitable for processing the data pointed to by the params map.
boolean	canProcess(URL url) Tests if the provided url can be handled by this factory.
FileDataStore	createDataStore(File f)
DataStore	createDataStore(Map<String,?> params) Construct a live data source using the params specifed.
FileDataStore	createDataStore(URL url) A DataStore attached to the provided url, may be created if needed.
DataStore	createNewDataStore(Map<String,?> params)
String	getDescription() Describe the nature of the datasource constructed by this factory.
String	getDisplayName() Name suitable for display to end user.
String[]	getFileExtensions() The list of filename extentions handled by this factory.
Map<RenderingHints.Key,?>	getImplementationHints() No implementation hints required at this time
DataAccessFactory.Param[]	getParametersInfo() MetaData about the required Parameters (for createDataStore).
String	getTypeName(URL url) The typeName represented by the provided url.
boolean	isAvailable() Test to see if the implementation is available for use.

Methods inherited from class Object

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

Field Detail

FILE_PARAM

public static final DataAccessFactory.Param FILE_PARAM

Parameter description of information required to connect

URL_PARAM

public static final DataAccessFactory.Param URL_PARAM

BOUNDING_BOX

public static final DataAccessFactory.Param BOUNDING_BOX

WRITE_BOUNDS

public static final DataAccessFactory.Param WRITE_BOUNDS

QUICK_SCHEMA

public static final DataAccessFactory.Param QUICK_SCHEMA

Constructor Detail

GeoJSONDataStoreFactory

public GeoJSONDataStoreFactory()

Method Detail

getImplementationHints

public Map<RenderingHints.Key,?> getImplementationHints()

No implementation hints required at this time

Specified by:

getImplementationHints in interface Factory

Returns:

The map of hints, or an empty map if none.

getDisplayName

public String getDisplayName()

Description copied from interface: DataAccessFactory

Name suitable for display to end user.

A non localized display name for this data store type.

Specified by:

getDisplayName in interface DataAccessFactory

Returns:

A short name suitable for display in a user interface.

getDescription

public String getDescription()

Description copied from interface: DataAccessFactory

Describe the nature of the datasource constructed by this factory.

A non localized description of this data store type.

Specified by:

getDescription in interface DataAccessFactory

Returns:

A human readable description that is suitable for inclusion in a list of available datasources.

createDataStore

public DataStore createDataStore(Map<String,?> params)
                          throws IOException

Description copied from interface: DataStoreFactorySpi

Construct a live data source using the params specifed.

You can think of this as setting up a connection to the back end data source.

Magic Params: the following params are magic and are honoured by convention by the GeoServer and uDig application.

• "user": is taken to be the user name
• "passwd": is taken to be the password
• "namespace": is taken to be the namespace prefix (and will be kept in sync with GeoServer namespace management.

When we eventually move over to the use of OpperationalParam we will have to find someway to codify this convention.

Specified by:

createDataStore in interface DataAccessFactory

Specified by:

createDataStore in interface DataStoreFactorySpi

Parameters:

params - The full set of information needed to construct a live data store. Typical key values for the map include: url - location of a resource, used by file reading datasources. dbtype - the type of the database to connect to, e.g. postgis, mysql

Returns:

The created DataStore, this may be null if the required resource was not found or if insufficent parameters were given. Note that canProcess() should have returned false if the problem is to do with insuficent parameters.

Throws:

IOException - if there were any problems setting up (creating or connecting) the datasource.

createNewDataStore

public DataStore createNewDataStore(Map<String,?> params)
                             throws IOException

Specified by:

createNewDataStore in interface DataStoreFactorySpi

Throws:

IOException

isAvailable

public boolean isAvailable()

Description copied from interface: DataAccessFactory

Test to see if the implementation is available for use. This method ensures all the appropriate libraries to construct the DataAccess are available.

Most factories will simply return true as GeoTools will distribute the appropriate libraries. Though it's not a bad idea for DataStoreFactories to check to make sure that the libraries are there.

OracleDataStoreFactory is an example of one that may generally return false, since GeoTools can not distribute the oracle jars. (they must be added by the client.)

One may ask how this is different than canProcess, and basically available is used by the DataStoreFinder getAvailableDataStore method, so that DataStores that can not even be used do not show up as options in gui applications.

Specified by:

isAvailable in interface DataAccessFactory

Returns:

true if and only if this factory has all the appropriate jars on the classpath to create DataStores.

getParametersInfo

public DataAccessFactory.Param[] getParametersInfo()

Description copied from interface: DataAccessFactory

MetaData about the required Parameters (for createDataStore).

Interpretation of FeatureDescriptor values:

• getDisplayName(): Gets the localized display name of this feature.
• getName(): Gets the programmatic name of this feature (used as the key in params)
• getShortDescription(): Gets the short description of this feature.

This should be the same as:

 Object params = factory.getParameters();
 BeanInfo info = getBeanInfo( params );

 return info.getPropertyDescriptors();
 

Specified by:

getParametersInfo in interface DataAccessFactory

Returns:

Param array describing the Map for createDataStore

getFileExtensions

public String[] getFileExtensions()

Description copied from interface: FileDataStoreFactorySpi

The list of filename extentions handled by this factory.

Specified by:

getFileExtensions in interface FileDataStoreFactorySpi

Returns:

List of file extensions which can be read by this dataStore.

canProcess

public boolean canProcess(Map<String,?> params)

Description copied from interface: DataAccessFactory

Test to see if this factory is suitable for processing the data pointed to by the params map.

If this datasource requires a number of parameters then this mehtod should check that they are all present and that they are all valid. If the datasource is a file reading data source then the extentions or mime types of any files specified should be checked. For example, a Shapefile datasource should check that the url param ends with shp, such tests should be case insensative.

Specified by:

canProcess in interface DataAccessFactory

Parameters:

params - The full set of information needed to construct a live data source.

Returns:

booean true if and only if this factory can process the resource indicated by the param set and all the required params are pressent.

canProcess

public boolean canProcess(URL url)

Description copied from interface: FileDataStoreFactorySpi

Tests if the provided url can be handled by this factory.

Specified by:

canProcess in interface FileDataStoreFactorySpi

Parameters:

url - URL to a real file (may not be local)

Returns:

true if this url can when this dataStore can resolve and read the data specified

createDataStore

public FileDataStore createDataStore(URL url)

Description copied from interface: FileDataStoreFactorySpi

A DataStore attached to the provided url, may be created if needed.

Please note that additional configuration options may be available via the traditional createDataStore( Map ) method provided by the superclass.

Specified by:

createDataStore in interface FileDataStoreFactorySpi

Parameters:

url - The data location for the

Returns:

Returns an AbstractFileDataStore created from the data source provided.

See Also:

AbstractFileDataStore

createDataStore

public FileDataStore createDataStore(File f)

getTypeName

public String getTypeName(URL url)

Description copied from interface: FileDataStoreFactorySpi

The typeName represented by the provided url.

Specified by:

getTypeName in interface FileDataStoreFactorySpi

Parameters:

url - The location of the datum to parse into features

Returns:

Returns the typename of the datum specified (on occasion this may involve starting the parse as well to get the FeatureType -- may not be instantanious).