Package org.geotools.filter.visitor

Class NullExpressionVisitor

Object

NullExpressionVisitor

All Implemented Interfaces:

ExpressionVisitor

public class NullExpressionVisitor
extends Object
implements ExpressionVisitor

This class does *nothing* - useful to prevent null checks in AbstractFilterVisitor.

Author:

Jody

Constructor Summary

Constructors

Constructor	Description
NullExpressionVisitor()

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)

Methods inherited from class Object

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

Constructor Detail

NullExpressionVisitor

public NullExpressionVisitor()

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(Function expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Literal 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(PropertyName expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Subtract expression,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor