org.geotools.filter
Class MapScaleDenominatorImpl

java.lang.Object
  org.geotools.filter.expression.ExpressionAbstract
      org.geotools.filter.DefaultExpression
          org.geotools.filter.MapScaleDenominatorImpl

All Implemented Interfaces:

EnvironmentVariable, org.opengis.filter.expression.Expression, Expression, ExpressionType, org.opengis.filter.expression.Literal, MapScaleDenominator

public class MapScaleDenominatorImpl

extends DefaultExpression

implements MapScaleDenominator, org.opengis.filter.expression.Literal

This class is actualy a place holder. It resolves to 1.0 but should actualy be substituted for a literal that actualy contains the current map scale before use.

Author:

James

Field Summary

Fields inherited from class org.geotools.filter.DefaultExpression

expressionType, permissiveConstruction

Fields inherited from interface org.geotools.filter.MapScaleDenominator

EV_NAME

Fields inherited from interface org.geotools.filter.expression.ExpressionType

ATTRIBUTE, ATTRIBUTE_DOUBLE, ATTRIBUTE_GEOMETRY, ATTRIBUTE_INTEGER, ATTRIBUTE_STRING, ATTRIBUTE_UNDECLARED, FUNCTION, LITERAL_DOUBLE, LITERAL_GEOMETRY, LITERAL_INTEGER, LITERAL_STRING, MATH_ADD, MATH_DIVIDE, MATH_MULTIPLY, MATH_SUBTRACT

Constructor Summary

MapScaleDenominatorImpl()
Creates a new instance of MapScaleDenominatorImpl

Method Summary

java.lang.Object	accept(org.opengis.filter.expression.ExpressionVisitor visitor, java.lang.Object extraData) Subclass should override, default implementation just returns extraData
java.lang.Object	evaluate(Feature f) Evaluates the expression against an instance of Feature.
java.lang.Object	getValue()
void	setValue(java.lang.Object constant)
java.lang.String	toString()

Methods inherited from class org.geotools.filter.DefaultExpression

accept, evaluate, getType, getValue, isAttributeExpression, isExpression, isGeometryExpression, isLiteralExpression, isMathExpression, isMathExpression

Methods inherited from class org.geotools.filter.expression.ExpressionAbstract

eval

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.geotools.filter.EnvironmentVariable

getValue

Methods inherited from interface org.geotools.filter.expression.Expression

accept, getType

Methods inherited from interface org.opengis.filter.expression.Expression

evaluate

Constructor Detail

MapScaleDenominatorImpl

public MapScaleDenominatorImpl()

Creates a new instance of MapScaleDenominatorImpl

Method Detail

evaluate

public java.lang.Object evaluate(Feature f)

Description copied from interface: Expression

Evaluates the expression against an instance of Feature.

Specified by:

evaluate in interface Expression

Overrides:

evaluate in class DefaultExpression

Parameters:

f - Specified feature to use when returning value.

Returns:

The value of this expression based on the feature.

getValue

public java.lang.Object getValue()

Specified by:

getValue in interface org.opengis.filter.expression.Literal

setValue

public void setValue(java.lang.Object constant)

Specified by:

setValue in interface org.opengis.filter.expression.Literal

accept

public java.lang.Object accept(org.opengis.filter.expression.ExpressionVisitor visitor,
                               java.lang.Object extraData)

Description copied from class: ExpressionAbstract

Subclass should override, default implementation just returns extraData

Specified by:

accept in interface org.opengis.filter.expression.Expression

Overrides:

accept in class ExpressionAbstract

toString

public java.lang.String toString()