org.geotools.filter
Interfaces 
AttributeExpression
BBoxExpression
BetweenFilter
CompareFilter
EnvironmentVariable
Expression
ExpressionType
FidFilter
Filter
FilterFactory
FilterHandler
FilterType
FilterVisitor
FilterVisitor2
FunctionExpression
GeometryDistanceFilter
GeometryFilter
LikeFilter
LiteralExpression
LogicFilter
MapScaleDenominator
MathExpression
NullFilter
SortBy
SortBy2
Classes 
AbstractFilter
AbstractFilterImpl
AndImpl
AreaFunction
AttributeExpressionImpl
AttributeExpressionImpl2
BBoxExpressionImpl
BetweenFilterImpl
BinaryComparisonAbstract
BinaryLogicAbstract
Capabilities
CartesianDistanceFilter
CategorizeFunction
CategorizeFunction.Name
CompareFilterImpl
ConstantExpression
DefaultExpression
ExpressionBuilder
ExpressionDOMParser
ExpressionSAXParser
FallbackFunction
FidFilterImpl
FilterAbstract
FilterAttributeExtractor
FilterCapabilities
FilterDOMParser
FilterFactoryFinder
FilterFactoryImpl
FilterFilter
FilteringIteration
FilterParsingUtils
Filters
FilterSAXParser
FilterTransformer
FilterTransformer.FilterTranslator
FilterVisitorFilterWrapper
FunctionExpressionImpl
FunctionFinder
FunctionImpl
GeometryFilterImpl
InterpolateFunction
InterpolateFunction.Name
IsBetweenImpl
IsEqualsToImpl
IsGreaterThanImpl
IsGreaterThanOrEqualToImpl
IsLessThenImpl
IsLessThenOrEqualToImpl
IsNotEqualToImpl
IsNullImpl
LengthFunction
LikeFilterImpl
LiteralExpressionImpl
LogicFilterImpl
LogicSAXParser
MapScaleDenominatorImpl
MathExpressionImpl
MaxFunction
MinFunction
NotImpl
NullFilterImpl
OrImpl
RecodeFunction
RecodeFunction.Name
SortByImpl
SortOrder
SQLEncoder
SQLEncoderPostgis
SQLEncoderPostgisGeos
SQLUnpacker
Exceptions 
FilterFactoryCreationException
IllegalFilterException
MalformedFilterException
SQLEncoderException