org.geotools.data.complex

Class AppSchemaDataAccess

Object

AppSchemaDataAccess

All Implemented Interfaces:

DataAccess<FeatureType,Feature>

public class AppSchemaDataAccess
extends Object
implements DataAccess<FeatureType,Feature>

A DataAccess that maps a "simple" source DataStore into a source of full Feature features conforming to an application schema.

Since:

2.4

Author:

Gabriel Roldan (Axios Engineering), Ben Caradoc-Davies (CSIRO Earth Science and Resource Engineering), Rini Angreani (CSIRO Earth Science and Resource Engineering)

Constructor Summary

Constructors

Constructor and Description
AppSchemaDataAccess(Set<FeatureTypeMapping> mappings) Constructor.
AppSchemaDataAccess(Set<FeatureTypeMapping> mappings, boolean hidden) Two args constructor.

Method Summary

Modifier and Type	Method and Description
void	createSchema(FeatureType featureType) Not a supported operation.
void	dispose() Disposes of this data store and releases any resource that it is using.
Feature	findFeature(FeatureId id, Hints hints)
protected ReferencedEnvelope	getBounds(Query query) Computes the bounds of the features for the specified feature type that satisfy the query provided that there is a fast way to get that result.
protected int	getCount(Query targetQuery) Gets the number of the features that would be returned by this query for the specified feature type.
FeatureSource<FeatureType,Feature>	getFeatureSource(Name typeName) Return a feature source that can be used to obtain features of a particular type.
FeatureSource<FeatureType,Feature>	getFeatureSourceByName(Name typeName) Return a feature source that can be used to obtain features of a particular name.
ServiceInfo	getInfo() Not a supported operation.
FeatureTypeMapping	getMappingByName(Name typeName) Returns the mapping suite for the given targetElement name or mappingName.
FeatureTypeMapping	getMappingByNameOrElement(Name typeName) Returns the mapping suite for the given target type name.
List<Name>	getNames() Return the names of the target features.
URL	getParentUrl()
FeatureType	getSchema(Name typeName) Finds the target FeatureType named typeName in this ComplexDatastore's internal list of FeatureType mappings and returns it.
Name[]	getTypeNames() Returns the set of target type names this DataAccess holds, where the term 'target type name' refers to the name of one of the types this DataAccess produces by mapping another ones through the definitions stored in its FeatureTypeMappings
protected Filter	getUnsupportedFilter(String typeName, Filter filter) Returns Filter.INCLUDE, as the whole filter is unrolled and passed back to the underlying DataStore to be treated.
URL	getUrl()
boolean	hasElement(Name typeName)
boolean	hasName(Name name)
static boolean	matchProperty(String requestedProperty, XPathUtil.StepList target) Helper method for getSurrogatePropertyNames to match a requested single step property with a target x-path, ignoring namespaces
static boolean	matchProperty(XPathUtil.StepList requestedProperty, XPathUtil.StepList target) Helper method for getSurrogatePropertyNames to match a requested x-path property with a target x-path
protected void	register() Registers this data access to the registry so the mappings can be retrieved globally
void	removeSchema(Name typeName) Not a supported operation.
static Filter	unrollFilter(Filter complexFilter, FeatureTypeMapping mapping) Takes a filter that operates against a FeatureTypeMapping's target FeatureType, and unrolls it creating a new Filter that operates against the mapping's source FeatureType.
Query	unrollQuery(Query query, FeatureTypeMapping mapping) Creates a org.geotools.data.Query that operates over the surrogate DataStore, by unrolling the org.geotools.filter.Filter contained in the passed query , and replacing the list of required attributes by the ones of the mapped FeatureType.
void	updateSchema(Name typeName, FeatureType featureType) Not a supported operation.

Methods inherited from class Object

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

Constructor Detail

AppSchemaDataAccess

public AppSchemaDataAccess(Set<FeatureTypeMapping> mappings)
                    throws IOException

Constructor.

Parameters:

mappings - a Set containing a FeatureTypeMapping for each FeatureType this DataAccess is going to produce.

Throws:

IOException

AppSchemaDataAccess

public AppSchemaDataAccess(Set<FeatureTypeMapping> mappings,
                           boolean hidden)
                    throws IOException

Two args constructor.

Parameters:

mappings - a Set containing a FeatureTypeMapping for each FeatureType this DataAccess is going to produce.

hidden - marks this data access as non-accessible, which makes it a candidate for automatic disposal

Throws:

IOException

Method Detail

register

protected void register()

Registers this data access to the registry so the mappings can be retrieved globally

getTypeNames

public Name[] getTypeNames()
                    throws IOException

Returns the set of target type names this DataAccess holds, where the term 'target type name' refers to the name of one of the types this DataAccess produces by mapping another ones through the definitions stored in its FeatureTypeMappings

Throws:

IOException

getSchema

public FeatureType getSchema(Name typeName)
                      throws IOException

Finds the target FeatureType named typeName in this ComplexDatastore's internal list of FeatureType mappings and returns it.

Specified by:

getSchema in interface DataAccess<FeatureType,Feature>

Parameters:

typeName - Type name a the resource from getNames()

Returns:

Description of the FeatureType being made avaialble

Throws:

IOException

getMappingByName

public FeatureTypeMapping getMappingByName(Name typeName)
                                    throws IOException

Returns the mapping suite for the given targetElement name or mappingName.

Note this method is public just for unit testing purposes

Throws:

IOException

getMappingByNameOrElement

public FeatureTypeMapping getMappingByNameOrElement(Name typeName)
                                             throws IOException

Returns the mapping suite for the given target type name. This name would be the mappingName in the TypeMapping if it exists, otherwise it's the target element name.

Note this method is public just for unit testing purposes

Throws:

IOException

hasName

public boolean hasName(Name name)

Parameters:

name - mappingName or targetElement

Returns:

true if this data access contains mapping with for provided name

hasElement

public boolean hasElement(Name typeName)

Parameters:

typeName - targetElement name

Returns:

true if this data access contains mapping for provided targetElement name

getBounds

protected ReferencedEnvelope getBounds(Query query)
                                throws IOException

Computes the bounds of the features for the specified feature type that satisfy the query provided that there is a fast way to get that result.

Will return null if there is not fast way to compute the bounds. Since it's based on some kind of header/cached information, it's not guaranteed to be real bound of the features

Returns:

the bounds, or null if too expensive

Throws:

IOException

getCount

protected int getCount(Query targetQuery)
                throws IOException

Gets the number of the features that would be returned by this query for the specified feature type.

If getBounds(Query) returns -1 due to expense consider using getFeatures(Query).getCount() as a an alternative.

Parameters:

targetQuery - Contains the Filter and MaxFeatures to find the bounds for.

Returns:

The number of Features provided by the Query or -1 if count is too expensive to calculate or any errors or occur.

Throws:

IOException - if there are errors getting the count

getUnsupportedFilter

protected Filter getUnsupportedFilter(String typeName,
                                      Filter filter)

Returns Filter.INCLUDE, as the whole filter is unrolled and passed back to the underlying DataStore to be treated.

Returns:

Filter.INLCUDE

unrollQuery

public Query unrollQuery(Query query,
                         FeatureTypeMapping mapping)

Creates a org.geotools.data.Query that operates over the surrogate DataStore, by unrolling the org.geotools.filter.Filter contained in the passed query , and replacing the list of required attributes by the ones of the mapped FeatureType.

matchProperty

public static boolean matchProperty(XPathUtil.StepList requestedProperty,
                                    XPathUtil.StepList target)

Helper method for getSurrogatePropertyNames to match a requested x-path property with a target x-path

Parameters:

requestedProperty - requested property x-path

target - target x-path steps

Returns:

whether they match, i.e. when one of them is completely contained in the other

matchProperty

public static boolean matchProperty(String requestedProperty,
                                    XPathUtil.StepList target)

Helper method for getSurrogatePropertyNames to match a requested single step property with a target x-path, ignoring namespaces

Parameters:

requestedProperty - requested property x-path

target - target x-path steps

Returns:

whether they match, i.e. when one of them is completely contained in the other

unrollFilter

public static Filter unrollFilter(Filter complexFilter,
                                  FeatureTypeMapping mapping)

Takes a filter that operates against a FeatureTypeMapping's target FeatureType, and unrolls it creating a new Filter that operates against the mapping's source FeatureType.

Returns:

TODO: implement filter unrolling

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<FeatureType,Feature>

getInfo

public ServiceInfo getInfo()

Not a supported operation.

Specified by:

getInfo in interface DataAccess<FeatureType,Feature>

Returns:

SeviceInfo

See Also:

DataAccess.getInfo()

getNames

public List<Name> getNames()

Return the names of the target features.

Specified by:

getNames in interface DataAccess<FeatureType,Feature>

Returns:

Names of the available contents.

See Also:

DataAccess.getNames()

createSchema

public void createSchema(FeatureType featureType)
                  throws IOException

Not a supported operation.

Specified by:

createSchema in interface DataAccess<FeatureType,Feature>

Parameters:

featureType - FetureType to add to DataStore

Throws:

IOException - If featureType cannot be created

See Also:

DataAccess.createSchema(org.opengis.feature.type.FeatureType)

getFeatureSource

public FeatureSource<FeatureType,Feature> getFeatureSource(Name typeName)
                                                    throws IOException

Return a feature source that can be used to obtain features of a particular type.

Specified by:

getFeatureSource in interface DataAccess<FeatureType,Feature>

Returns:

Access to the named resource being made available

Throws:

IOException

See Also:

DataAccess.getFeatureSource(org.opengis.feature.type.Name)

updateSchema

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

Not a supported operation.

Specified by:

updateSchema in interface DataAccess<FeatureType,Feature>

Throws:

IOException - if the operation failed

See Also:

DataAccess.updateSchema(org.opengis.feature.type.Name, org.opengis.feature.type.FeatureType)

removeSchema

public void removeSchema(Name typeName)
                  throws IOException

Not a supported operation.

Specified by:

removeSchema in interface DataAccess<FeatureType,Feature>

Throws:

IOException - if the operation failed

See Also:

DataAccess.removeSchema(org.opengis.feature.type.Name)

getFeatureSourceByName

public FeatureSource<FeatureType,Feature> getFeatureSourceByName(Name typeName)
                                                          throws IOException

Return a feature source that can be used to obtain features of a particular name. This name would be the mappingName in the TypeMapping if it exists, otherwise it's the target element name.

Parameters:

typeName - mappingName or targetElement

Returns:

Mapping feature source

Throws:

IOException

findFeature

public Feature findFeature(FeatureId id,
                           Hints hints)
                    throws IOException

Throws:

IOException

getUrl

public URL getUrl()

getParentUrl

public URL getParentUrl()