Package org.h2gis.geotools

Class H2GISPSFilterToSql

Object

FilterToSQL

PreparedFilterToSQL

H2GISPSFilterToSql

All Implemented Interfaces:

ExpressionVisitor, FilterVisitor

public class H2GISPSFilterToSql
extends PreparedFilterToSQL

jdbc-h2gis is an extension to connect H2GIS a spatial library that brings spatial support to the H2 Java database.

H2GIS dialect filter based on prepared statements.

Author:

Erwan Bocher

Nested Class Summary

Nested classes/interfaces inherited from class FilterToSQL

FilterToSQL.FieldEncoder

Field Summary

Fields inherited from class PreparedFilterToSQL

descriptors, dialect, dimensions, literalTypes, literalValues, SRIDs

Fields inherited from class FilterToSQL

capabilities, currentDimension, currentGeometry, currentSRID, databaseSchema, encodingFunction, escapeBackslash, featureType, fieldEncoder, filterFactory, inEncodingEnabled, inline, IO_ERROR, LOGGER, out, primaryKey, sqlNameEscape

Constructor Summary

Constructors

Constructor	Description
H2GISPSFilterToSql(H2GISPSDialect dialect)

Method Summary

Modifier and Type	Method	Description
protected FilterCapabilities	createFilterCapabilities()	Sets the capabilities of this filter.
double	getDistanceInNativeUnits(DistanceBufferOperator operator)	Rough evaluation of distance in the units of the current SRID, assuming that the SRID maps to a known EPSG code.
protected String	getFunctionName(Function function)	Maps the function to the native database function name
void	setFunctionEncodingEnabled(boolean functionEncodingEnabled)
Object	visit(Function function, Object extraData)	Writes sql for a function expression.
protected Object	visitBinarySpatialOperator(BinarySpatialOperator filter, Expression e1, Expression e2, Object extraData)	Handles the more general case of two generic expressions.
protected Object	visitBinarySpatialOperator(BinarySpatialOperator filter, PropertyName property, Literal geometry, boolean swapped, Object extraData)	Handles the common case of a PropertyName,Literal geometry binary spatial operator.

Methods inherited from class PreparedFilterToSQL

convertEnvelopeToPolygon, getDescriptors, getDimensions, getLiteralTypes, getLiteralValues, getSRIDs, isPrepareEnabled, setPrepareEnabled, visit, visit

Methods inherited from class FilterToSQL

cast, encode, encode, encodeBinaryComparisonOperator, encodeToString, encodeToString, escapeLiteral, escapeName, evaluateLiteral, getCapabilities, getDatabaseSchema, getExpressionType, getFeatureType, getFunctionReturnType, getParameter, getPrimaryKey, getSqlNameEscape, isBinaryExpression, isEscapeBackslash, isInEncodingEnabled, processLikeLeftOperand, setCapabilities, setDatabaseSchema, setEscapeBackslash, setFeatureType, setFieldEncoder, setInEncodingEnabled, setInline, setPrimaryKey, setSqlNameEscape, setWriter, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitBinaryComparisonOperator, visitBinarySpatialOperator, visitBinaryTemporalOperator, visitBinaryTemporalOperator, visitBinaryTemporalOperator, visitInFunction, visitLiteralGeometry, visitLiteralTimePeriod, visitNullFilter, writeBinaryExpression, writeBinaryExpressionMember, writeLiteral

Methods inherited from class Object

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

Constructor Details

H2GISPSFilterToSql

public H2GISPSFilterToSql(H2GISPSDialect dialect)

Method Details

createFilterCapabilities

protected FilterCapabilities createFilterCapabilities()

Description copied from class: FilterToSQL

Sets the capabilities of this filter.

Overrides:

createFilterCapabilities in class FilterToSQL

Returns:

FilterCapabilities for this Filter

visitBinarySpatialOperator

protected Object visitBinarySpatialOperator(BinarySpatialOperator filter,
 PropertyName property,
 Literal geometry,
 boolean swapped,
 Object extraData)

Description copied from class: FilterToSQL

Handles the common case of a PropertyName,Literal geometry binary spatial operator.

Overrides:

visitBinarySpatialOperator in class FilterToSQL

visitBinarySpatialOperator

protected Object visitBinarySpatialOperator(BinarySpatialOperator filter,
 Expression e1,
 Expression e2,
 Object extraData)

Description copied from class: FilterToSQL

Handles the more general case of two generic expressions.

The most common case is two PropertyName expressions, which happens during a spatial join.

Overrides:

visitBinarySpatialOperator in class FilterToSQL

setFunctionEncodingEnabled

public void setFunctionEncodingEnabled(boolean functionEncodingEnabled)

getFunctionName

protected String getFunctionName(Function function)

Description copied from class: FilterToSQL

Maps the function to the native database function name

Overrides:

getFunctionName in class FilterToSQL

getDistanceInNativeUnits

public double getDistanceInNativeUnits(DistanceBufferOperator operator)

Description copied from class: FilterToSQL

Rough evaluation of distance in the units of the current SRID, assuming that the SRID maps to a known EPSG code. Will use a rather imprecise transformation for distances over degrees, but better than nothing.

Overrides:

getDistanceInNativeUnits in class FilterToSQL

visit

public Object visit(Function function,
 Object extraData)
             throws RuntimeException

Description copied from class: FilterToSQL

Writes sql for a function expression. By default it will write the call by using the same arguments provided to the GeoTools function, subclasses should override on a case by case basis if this behavior is not the desired one.

Specified by:

visit in interface ExpressionVisitor

Overrides:

visit in class FilterToSQL

Parameters:

function - a function expression

Throws:

RuntimeException - If an IO error occurs.

See Also:

• FilterToSQL.getFunctionName(Function)