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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.data.view

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.geotools.data.view .DefaultView

DefaultView

public class DefaultView implements FeatureSource(Code)

Wrapper for FeatureSource constrained by a Query.

Support FeatureSource decorator that takes care of mapping a Query & FeatureSource with the schema and definition query configured for it.

Because GeoServer requires that attributes always be returned in the same order we need a way to smoothly inforce this. Could we use this class to do so?

WARNING: this class is a placeholder for ideas right now - it may not always impement FeatureSource.

author:
Gabriel Rold�n

Field Summary
protected FeatureSource	source

Constructor Summary
public	DefaultView(FeatureSource source, Query query) Creates a new GeoServerFeatureSource object.

Method Summary
public void	addFeatureListener(FeatureListener listener) Implement addFeatureListener.
public static FeatureSource	create(FeatureSource source, Query query) Factory that make the correct decorator for the provided featureSource. This factory method is public and will be used to create all required subclasses.
public Envelope	getBounds() Retrieves the total extent of this FeatureSource.
public Envelope	getBounds(Query query) Retrive the extent of the Query. This method provides access to an optimized getBounds opperation.
public int	getCount(Query query) Adjust query and forward to source. This method provides access to an optimized getCount opperation.
public DataStore	getDataStore() Implement getDataStore.
public FeatureCollection	getFeatures(Query query) Implement getFeatures.
public FeatureCollection	getFeatures(Filter filter) Implement getFeatures.
public FeatureCollection	getFeatures() Implement getFeatures.
public FeatureType	getSchema() Implement getSchema.
public Set	getSupportedHints()
protected Filter	makeDefinitionFilter(Filter filter) If a definition query has been configured for the FeatureTypeInfo, makes and return a new Filter that contains both the query's filter and the layer's definition one, by logic AND'ing them.
protected DefaultQuery	makeDefinitionQuery(Query query) Takes a query and adapts it to match re definitionQuery filter configured for a feature type.
public void	removeFeatureListener(FeatureListener listener) Implement removeFeatureListener.

Field Detail

source
protected FeatureSource source(Code)
	FeatureSource being served up

Constructor Detail

DefaultView

public DefaultView(FeatureSource source, Query query) throws SchemaException(Code)

Creates a new GeoServerFeatureSource object.

Grabs the following from query:

typeName - only used if client does not supply
cs - only used if client does not supply
csForce - only used if client does not supply
filter - combined with client filter
propertyNames - combined with client filter (indicate property names that *must* be included)

Schema is generated based on this information.

Parameters:
  source - a FeatureSource
Parameters:
  query - Filter used to limit results
throws:
  SchemaException -

Method Detail

addFeatureListener
public void addFeatureListener(FeatureListener listener)(Code)
	Implement addFeatureListener. Description ... Parameters: listener - See Also: org.geotools.data.FeatureSource.addFeatureListener(org.geotools.data.FeatureListener)

create
public static FeatureSource create(FeatureSource source, Query query) throws SchemaException(Code)
	Factory that make the correct decorator for the provided featureSource. This factory method is public and will be used to create all required subclasses. By comparison the constructors for this class have package visibiliy. TODO: revisit this - I am not sure I want write access to views (especially if they do reprojection). Parameters: source - Parameters: query - @throwsSchemaException

getBounds
public Envelope getBounds() throws IOException(Code)
	Retrieves the total extent of this FeatureSource. Please note this extent will reflect the provided definitionQuery. Extent of this FeatureSource, or `null` if nooptimizations exist. throws: IOException - If bounds of definitionQuery

getBounds

public Envelope getBounds(Query query) throws IOException(Code)

Retrive the extent of the Query.

This method provides access to an optimized getBounds opperation. If no optimized opperation is available null will be returned.

You may still make use of getFeatures( Query ).getCount() which will return the correct answer (even if it has to itterate through all the results to do so.

Parameters:
query - User's query Extend of Query or null if no optimization isavailable
throws:
IOException - If a problem is encountered with source

getCount

public int getCount(Query query)(Code)

Adjust query and forward to source.

This method provides access to an optimized getCount opperation. If no optimized opperation is available -1 will be returned.

You may still make use of getFeatures( Query ).getCount() which will return the correct answer (even if it has to itterate through all the results to do so).

Parameters:
query - User's query. Number of Features for Query, or -1 if no optimization isavailable.

getDataStore
public DataStore getDataStore()(Code)
	Implement getDataStore. Description ... @see org.geotools.data.FeatureSource#getDataStore()

getFeatures
public FeatureCollection getFeatures(Query query) throws IOException(Code)
	Implement getFeatures. Description ... Parameters: query - @throwsIOException See Also: org.geotools.data.FeatureSource.getFeatures(org.geotools.data.Query)

getFeatures
public FeatureCollection getFeatures(Filter filter) throws IOException(Code)
	Implement getFeatures. Description ... Parameters: filter - @throwsIOException

getFeatures
public FeatureCollection getFeatures() throws IOException(Code)
	Implement getFeatures. Description ... @throwsIOException See Also: org.geotools.data.FeatureSource.getFeatures

getSchema
public FeatureType getSchema()(Code)
	Implement getSchema. Description ... @see org.geotools.data.FeatureSource#getSchema()

getSupportedHints
public Set getSupportedHints()(Code)

makeDefinitionFilter
protected Filter makeDefinitionFilter(Filter filter) throws DataSourceException(Code)
	If a definition query has been configured for the FeatureTypeInfo, makes and return a new Filter that contains both the query's filter and the layer's definition one, by logic AND'ing them. Parameters: filter - Origional user supplied Filter Filter adjusted to the limitations of definitionQuery throws: DataSourceException - If the filter could not meet the limitations ofdefinitionQuery

makeDefinitionQuery

protected DefaultQuery makeDefinitionQuery(Query query) throws IOException(Code)

Takes a query and adapts it to match re definitionQuery filter configured for a feature type. It won't handle coordinate system changes

Grabs the following from query:

typeName - only used if client does not supply
filter - combined with client filter
propertyNames - combined with client filter (indicate property names that *must* be included)

Parameters:
  query - Query against this DataStore Query restricted to the limits of definitionQuery
throws:
  IOException - See DataSourceException
throws:
  DataSourceException - If query could not meet the restrictions of definitionQuery

removeFeatureListener
public void removeFeatureListener(FeatureListener listener)(Code)
	Implement removeFeatureListener. Description ... Parameters: listener - See Also: org.geotools.data.FeatureSource.removeFeatureListener(org.geotools.data.FeatureListener)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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