com.puppycrawl.tools.checkstyle.api
Interfaces 
Configurable
Configuration
Context
Contextualizable
FileSetCheck
MessageDispatcher
Classes 
AbstractFileSetCheck
AbstractViolationReporter
AutomaticBean
Check
DetailAST
FileContents
FullIdent
LocalizedMessage
LocalizedMessages
Scope
ScopeUtils
SeverityLevel
TokenTypes
Utils
Exceptions 
CheckstyleException