org.geotools.filter
Class FilterAbstract

Object
  FilterAbstract

All Implemented Interfaces:

Filter

Direct Known Subclasses:

AbstractFilter

public abstract class FilterAbstract
extends Object
implements Filter

Abstract implementation for Filter.

Author:

Jody Garnett

Field Summary

protected FilterFactory

factory filter factory

Fields inherited from interface Filter

EXCLUDE, INCLUDE

Constructor Summary

protected

FilterAbstract(FilterFactory factory)

Method Summary

Object	accept(FilterVisitor visitor, Object extraData) Subclass should override, default implementation just returns extraData
boolean	accepts(SimpleFeature feature) Straight call throught to: evaulate( feature )
protected Object	eval(Expression expression, Object object) Helper method for subclasses to reduce null checks and automatically unpack values from attributes and collections
protected Object	eval(Expression expression, Object object, Class context) Helper method for subclasses to reduce null checks
protected Object	eval(Expression expression, SimpleFeature feature) Helper method for subclasses to reduce null checks
boolean	evaluate(SimpleFeature feature) Subclass should overrride.

Methods inherited from class Object

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

Methods inherited from interface Filter

evaluate

Field Detail

factory

protected FilterFactory factory

filter factory

Constructor Detail

FilterAbstract

protected FilterAbstract(FilterFactory factory)

Parameters:

factory - FilterFactory injected into the filter.

Method Detail

evaluate

public boolean evaluate(SimpleFeature feature)

Subclass should overrride. Default value is false

accepts

public boolean accepts(SimpleFeature feature)

Straight call throught to: evaulate( feature )

accept

public Object accept(FilterVisitor visitor,
                     Object extraData)

Subclass should override, default implementation just returns extraData

Specified by:

accept in interface Filter

eval

protected Object eval(Expression expression,
                      SimpleFeature feature)

Helper method for subclasses to reduce null checks

Parameters:

expression -

feature -

Returns:

value or null

eval

protected Object eval(Expression expression,
                      Object object)

Helper method for subclasses to reduce null checks and automatically unpack values from attributes and collections

Parameters:

expression -

object -

Returns:

value or null

eval

protected Object eval(Expression expression,
                      Object object,
                      Class context)

Helper method for subclasses to reduce null checks

Parameters:

expression -

object -

context -

Returns:

value or null