org.geotools.filter
Interfaces 
AttributeExpression
BBoxExpression
BetweenFilter
CompareFilter
EnvironmentVariable
Expression
ExpressionType
FidFilter
Filter
FilterHandler
FilterType
FilterVisitor
FunctionExpression
GeometryDistanceFilter
GeometryFilter
LikeFilter
LiteralExpression
LogicFilter
MapScaleDenominator
MathExpression
NullFilter
Classes 
AbstractFilter
AbstractFilterImpl
AreaFunction
AttributeExpressionImpl
AttributeExpressionImpl2
BBoxExpressionImpl
BetweenFilterImpl
CartesianDistanceFilter
CompareFilterImpl
DefaultExpression
ExpressionBuilder
ExpressionDOMParser
ExpressionSAXParser
FidFilterImpl
FilterAttributeExtractor
FilterCapabilities
FilterCapabilitiesMask
FilterDOMParser
FilterFactory
FilterFactoryImpl
FilterFilter
FilteringIteration
FilterSAXParser
FilterTransformer
FilterTransformer.FilterTranslator
FunctionExpressionImpl
GeometryEncoderSDE
GeometryExpressionImpl
GeometryFilterImpl
HsqlFilterFactoryImpl
LengthFunction
LikeFilterImpl
LiteralExpressionImpl
LogicFilterImpl
LogicSAXParser
MapScaleDenominatorImpl
MathExpressionImpl
MaxFunction
MinFunction
NullFilterImpl
SQLEncoder
SQLEncoderBBOX
SQLEncoderHsql
SQLEncoderLocationsXY
SQLEncoderMySQL
SQLEncoderOracle
SQLEncoderPostgis
SQLEncoderPostgisGeos
SQLEncoderSDE
SQLUnpacker
XMLEncoder
Exceptions 
FilterFactoryCreationException
GeometryEncoderException
IllegalFilterException
MalformedFilterException
SQLEncoderException