org.geotools.filter.visitor
Class NullExpressionVisitor

Object
  extended by 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
NullExpressionVisitor()
           
 
Method Summary
 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


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