Package org.geotools.filter.expression

Class AbstractExpressionVisitor

Object

AbstractExpressionVisitor

All Implemented Interfaces:

ExpressionVisitor

public class AbstractExpressionVisitor
extends Object
implements ExpressionVisitor

Empty "abstract" implementation of ExpressionVisitor. Subclasses should override desired methods.

Author:

Cory Horner, Refractions Research Inc.

Constructor Summary

Constructors

Constructor	Description
AbstractExpressionVisitor()

Method Summary

Modifier and Type	Method	Description
Object	visit(Add expr, Object extraData)
Object	visit(Divide expr, Object extraData)
Object	visit(Function expr, Object extraData)
Object	visit(Literal expr, Object extraData)
Object	visit(Multiply expr, Object extraData)
Object	visit(NilExpression expr, Object extraData)	Used to visit a Expression.NIL, also called for null where an expression is expected.
Object	visit(PropertyName expr, Object extraData)
Object	visit(Subtract expr, Object extraData)

Methods inherited from class Object

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

Constructor Detail

AbstractExpressionVisitor

public AbstractExpressionVisitor()

Method Detail

visit

public Object visit(NilExpression expr,
                    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 expr,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Divide expr,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Function expr,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Literal expr,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Multiply expr,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(PropertyName expr,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor

visit

public Object visit(Subtract expr,
                    Object extraData)

Specified by:

visit in interface ExpressionVisitor