org.geotools.filter
Class LengthFunction

java.lang.Object
  org.geotools.filter.expression.ExpressionAbstract
      org.geotools.filter.DefaultExpression
          org.geotools.filter.FunctionExpressionImpl
              org.geotools.filter.LengthFunction

All Implemented Interfaces:

org.opengis.filter.expression.Expression, Expression, ExpressionType, Factory, org.opengis.filter.expression.Function, FunctionExpression

public class LengthFunction

extends FunctionExpressionImpl

Takes an AttributeExpression, and computes the length of the data for the attribute.

Author:

dzwiers

Field Summary

Fields inherited from class org.geotools.filter.DefaultExpression

expressionType, permissiveConstruction

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

LengthFunction()

Method Summary

java.lang.Object	evaluate(Feature feature) Evaluates the expression against an instance of Feature.
int	getArgCount() Gets the number of arguments that are set.
Expression[]	getArgs() Since this class is heavily subclasses within the geotools toolkit itself we relax the 'final' restriction of this deprecated method.
java.lang.String	getName() Gets the name of this function.
void	setArgs(Expression[] args) Since this class is heavily subclassed within the geotools toolkit itself we relax the 'final' restriction of this deprecated method.
java.lang.String	toString()

Methods inherited from class org.geotools.filter.FunctionExpressionImpl

accept, getImplementationHints, getParameters, getType, setName, setParameters

Methods inherited from class org.geotools.filter.DefaultExpression

accept, evaluate, 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.expression.Expression

accept, getValue

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

evaluate

Constructor Detail

LengthFunction

public LengthFunction()

Method Detail

getName

public java.lang.String getName()

Description copied from class: FunctionExpressionImpl

Gets the name of this function.

Specified by:

getName in interface FunctionExpression

Overrides:

getName in class FunctionExpressionImpl

Returns:

the name of the function.

setArgs

public void setArgs(Expression[] args)

Description copied from class: FunctionExpressionImpl

Since this class is heavily subclassed within the geotools toolkit itself we relax the 'final' restriction of this deprecated method.

Specified by:

setArgs in interface FunctionExpression

Overrides:

setArgs in class FunctionExpressionImpl

getArgCount

public int getArgCount()

Description copied from class: FunctionExpressionImpl

Gets the number of arguments that are set.

Specified by:

getArgCount in interface FunctionExpression

Specified by:

getArgCount in class FunctionExpressionImpl

Returns:

the number of args.

getArgs

public Expression[] getArgs()

Description copied from class: FunctionExpressionImpl

Since this class is heavily subclasses within the geotools toolkit itself we relax the 'final' restriction of this deprecated method.

Specified by:

getArgs in interface FunctionExpression

Overrides:

getArgs in class FunctionExpressionImpl

evaluate

public java.lang.Object evaluate(Feature feature)

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:

feature - Specified feature to use when returning value.

Returns:

The value of this expression based on the feature.

toString

public java.lang.String toString()