org.geotools.filter
Class FilterAbstract

java.lang.Object
  org.geotools.filter.FilterAbstract

All Implemented Interfaces:

org.opengis.filter.Filter

Direct Known Subclasses:

AbstractFilter, IsBetweenImpl, IsNullImpl

public class FilterAbstract

extends java.lang.Object

implements org.opengis.filter.Filter

Abstract implementation for Filter.

Author:

Jody Garnett

Constructor Summary

protected

FilterAbstract(FilterFactory factory)

Method Summary

java.lang.Object	accept(org.opengis.filter.FilterVisitor visitor, java.lang.Object extraData) Subclass should override, default implementation just returns extraData
boolean	accepts(Feature feature) Straight call throught to: evaulate( feature )
protected java.lang.Comparable	comparable(org.opengis.filter.expression.Expression expr, Feature feature) Subclass convenience method for turning an expression + feature into something comparable.
protected java.lang.Object	eval(Expression expression, Feature feature) Helper method for subclasses to reduce null checks
protected java.lang.Object	eval(org.opengis.filter.expression.Expression expression, java.lang.Object object) Helper method for subclasses to reduce null checks
boolean	evaluate(Feature feature) Subclass should overrride.
boolean	evaluate(java.lang.Object object) Subclass should overrride.

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterAbstract

protected FilterAbstract(FilterFactory factory)

Parameters:

factory - FilterFactory injected into the filter.

Method Detail

evaluate

public boolean evaluate(Feature feature)

Subclass should overrride. Default value is false

evaluate

public boolean evaluate(java.lang.Object object)

Subclass should overrride. Default value is false

Specified by:

evaluate in interface org.opengis.filter.Filter

accepts

public boolean accepts(Feature feature)

Straight call throught to: evaulate( feature )

accept

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

Subclass should override, default implementation just returns extraData

Specified by:

accept in interface org.opengis.filter.Filter

eval

protected java.lang.Object eval(Expression expression,
                                Feature feature)

Helper method for subclasses to reduce null checks

Parameters:

expression -

feature -

Returns:

value or null

eval

protected java.lang.Object eval(org.opengis.filter.expression.Expression expression,
                                java.lang.Object object)

Helper method for subclasses to reduce null checks

Parameters:

expression -

object -

Returns:

value or null

comparable

protected java.lang.Comparable comparable(org.opengis.filter.expression.Expression expr,
                                          Feature feature)

Subclass convenience method for turning an expression + feature into something comparable.

If the result of the expression is something that implements Comparable it is returned directly, otherwise the object is transformed to a string and returned.

Parameters:

expr - The expression

feature - The feature.

Returns:

Something comparable.