org.geotools.filter
Class SQLEncoderPostgisGeos

java.lang.Object
  org.geotools.filter.SQLEncoder
      org.geotools.filter.SQLEncoderPostgis
          org.geotools.filter.SQLEncoderPostgisGeos

All Implemented Interfaces:

FilterVisitor

public class SQLEncoderPostgisGeos

extends SQLEncoderPostgis

implements FilterVisitor

Encodes a filter into a SQL WHERE statement for postgis. With geos installed. This should be redone, probably integrated with the postgis stuff, but that whole hierarchy should be redone, since the capabilities stuff is a bit wacky. This should only be used on versions of postgis installed with GEOS support, to handle all the advanced spatial queries.

Version:

$Id: SQLEncoderPostgisGeos.java 18021 2006-02-14 20:36:18Z jdeolive $

Author:

Chris Holmes, TOPP

Field Summary

Fields inherited from class org.geotools.filter.SQLEncoderPostgis

looseBbox

Fields inherited from class org.geotools.filter.SQLEncoder

mapper, out

Constructor Summary

SQLEncoderPostgisGeos()
Empty constructor TODO: rethink empty constructor, as BBOXes _need_ an SRID, must make client set it somehow.

SQLEncoderPostgisGeos(int srid)
Constructor with srid.

Method Summary

FilterCapabilities	getCapabilities() Capabils of this encoder.
void	setDefaultGeometry(java.lang.String name) Sets the default geometry, so that filters with null for one of their expressions can assume that the default geometry is intended.
void	setSRID(int srid) Sets a spatial reference system ESPG number, so that the geometry can be properly encoded for postgis.
void	visit(GeometryFilter filter) Turns a geometry filter into the postgis sql bbox statement.
void	visit(LiteralExpression expression) Checks to see if the literal is a geometry, and encodes it if it is, if not just sends to the parent class.

Methods inherited from class org.geotools.filter.SQLEncoderPostgis

createFilterCapabilities, isLooseBbox, setLooseBbox, visitLiteralGeometry

Methods inherited from class org.geotools.filter.SQLEncoder

encode, encode, escapeName, getColnameEscape, setColnameEscape, setFIDMapper, setSqlNameEscape, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.geotools.filter.FilterVisitor

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Constructor Detail

SQLEncoderPostgisGeos

public SQLEncoderPostgisGeos()

Empty constructor TODO: rethink empty constructor, as BBOXes _need_ an SRID, must make client set it somehow. Maybe detect when encode is called?

SQLEncoderPostgisGeos

public SQLEncoderPostgisGeos(int srid)

Constructor with srid.

Parameters:

srid - spatial reference id to encode geometries with.

Method Detail

getCapabilities

public FilterCapabilities getCapabilities()

Capabils of this encoder.

Overrides:

getCapabilities in class SQLEncoder

Returns:

See Also:

org.geotools.filter.SQLEncoder#getCapabils()

setSRID

public void setSRID(int srid)

Sets a spatial reference system ESPG number, so that the geometry can be properly encoded for postgis. If geotools starts actually creating geometries with valid srids then this method will no longer be needed.

Overrides:

setSRID in class SQLEncoderPostgis

Parameters:

srid - the integer code for the EPSG spatial reference system.

setDefaultGeometry

public void setDefaultGeometry(java.lang.String name)

Sets the default geometry, so that filters with null for one of their expressions can assume that the default geometry is intended.

Overrides:

setDefaultGeometry in class SQLEncoderPostgis

Parameters:

name - the name of the default geometry Attribute.

Task:

REVISIT: pass in a featureType so that geometries can figure out their own default geometry?

visit

public void visit(GeometryFilter filter)
           throws java.lang.RuntimeException

Turns a geometry filter into the postgis sql bbox statement.

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class SQLEncoderPostgis

Parameters:

filter - the geometry filter to be encoded.

Throws:

java.lang.RuntimeException - for IO exception (need a better error)

visit

public void visit(LiteralExpression expression)
           throws java.lang.RuntimeException

Checks to see if the literal is a geometry, and encodes it if it is, if not just sends to the parent class.

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class SQLEncoder

Parameters:

expression - the expression to visit and encode.

Throws:

java.lang.RuntimeException - for IO exception (need a better error)