Package org.geotools.filter.visitor

Class ExpressionTypeVisitor

Object

ExpressionTypeVisitor

All Implemented Interfaces:

ExpressionVisitor

public class ExpressionTypeVisitor
extends Object
implements ExpressionVisitor

Returns the output type of the visited expression, taking into account functions output types, property types, and general promotion rules in arithmetic expressions

Author:

Andrea Aime - GeoSolutions

Constructor Summary

Constructors

Constructor	Description
ExpressionTypeVisitor(FeatureType featureType)

Method Summary

Modifier and Type	Method	Description
Object	visit(Add expression, Object extraData)
Object	visit(Divide expression, Object extraData)
Object	visit(Function expression, Object extraData)
Object	visit(Literal expression, Object extraData)
Object	visit(Multiply expression, Object extraData)
Object	visit(NilExpression expression, Object extraData)	Used to visit a Expression.NIL, also called for null where an expression is expected.
Object	visit(PropertyName expression, Object extraData)
Object	visit(Subtract expression, Object extraData)
protected Class<?>	visitBinaryExpression(BinaryExpression expression)
protected Object	visitIfThenElse(FilterFunction_if_then_else expression)	Special case for the if then else function, which stores parameters in the second and third list items

Methods inherited from class Object

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

Constructor Detail

ExpressionTypeVisitor

public ExpressionTypeVisitor(FeatureType featureType)

Method Detail

visit

public Object visit(NilExpression expression,
                    Object extraData)

Description copied from interface: ExpressionVisitor

Used to visit a Expression.NIL, also called for null where an expression is expected.

This is particularly useful when doing data transformations, as an example when using a StyleSymbolizer Expression.NIL can be used to represent the default stroke color.

Specified by:

visit in interface ExpressionVisitor

Returns:

implementation specific

visit

public Object visit(Add expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Divide expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Multiply expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Subtract expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visitBinaryExpression

protected Class<?> visitBinaryExpression(BinaryExpression expression)

visit

public Object visit(Function expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visitIfThenElse

protected Object visitIfThenElse(FilterFunction_if_then_else expression)

Special case for the if then else function, which stores parameters in the second and third list items

Parameters:

expression - IfThenElse function

Returns:

The common ancestor type of the two parameters possibly returned by if then else

visit

public Object visit(Literal expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(PropertyName expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor