org.geotools.filter
Class SQLEncoderLocationsXY

java.lang.Object
  org.geotools.filter.SQLEncoder
      org.geotools.filter.SQLEncoderLocationsXY

All Implemented Interfaces:

FilterVisitor

public class SQLEncoderLocationsXY

extends SQLEncoder

implements FilterVisitor

Encodes a filter into a SQL WHERE statement for MySQL. This class adds the ability to turn geometry filters into sql statements if they are bboxes.

Author:

Rob Atkinson , SCO, Debasish Sahu, debasish.sahu@rmsi.com

Field Summary

Fields inherited from class org.geotools.filter.SQLEncoder

mapper, out

Constructor Summary

SQLEncoderLocationsXY(int srid)

SQLEncoderLocationsXY(java.lang.String xcolumn, java.lang.String ycolumn)
Empty constructor TODO: rethink empty constructor, as BBOXes _need_ an SRID, must make client set it somehow.

Method Summary

protected FilterCapabilities	createFilterCapabilities() Sets the capabilities of this filter.
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	visitLiteralGeometry(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.SQLEncoder

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

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, visit

Constructor Detail

SQLEncoderLocationsXY

public SQLEncoderLocationsXY(java.lang.String xcolumn,
                             java.lang.String ycolumn)

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

SQLEncoderLocationsXY

public SQLEncoderLocationsXY(int srid)

Method Detail

createFilterCapabilities

protected FilterCapabilities createFilterCapabilities()

Description copied from class: SQLEncoder

Sets the capabilities of this filter.

Overrides:

createFilterCapabilities in class SQLEncoder

Returns:

FilterCapabilities for this Filter

See Also:

SQLEncoder.createFilterCapabilities()

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.

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.

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 SQLEncoder

Parameters:

filter - the geometry filter to be encoded.

Throws:

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

See Also:

FilterVisitor.visit(org.geotools.filter.GeometryFilter)

visitLiteralGeometry

public void visitLiteralGeometry(LiteralExpression expression)
                          throws java.io.IOException

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

Overrides:

visitLiteralGeometry in class SQLEncoder

Parameters:

expression - the expression to visit and encode.

Throws:

java.io.IOException - for IO exception (need a better error)