1..47
# ->configure()
 -  can add some options
 -  takes an options array as its first argument and values override default option values
 -  can add some message
 -  takes a messages array as its second argument and values override default message values
 -  throws an InvalidArgumentException if you pass some non existant options
 - The exception contains the non existant option names
 -  throws an InvalidArgumentException if you pass some non existant error codes
 - The exception contains the non existant error codes
# getRequiredOptions
 -  returns an array of required option names
 -  throws an RuntimeException if you don't pass a required option
# ->clean()
 -  returns a cleanup version of the data to validate
 -  throws a sfValidatorError exception if the data does not validate
 -  throws a sfValidatorError
 -  does not trim whitespaces by default
# ->isEmpty()
 - null value 
 - empty string value 
 - empty array value 
 - false value not 
# ->getEmptyValue()
 -  returns the representation of an empty value for this validator
# ->setOption()
 -  changes options (required for example)
 -  can turn on whitespace trimming
 -  throws an InvalidArgumentException if the option is not registered
# ->hasOption()
 -  returns true if the validator has the option
 -  returns false if the validator does not have the option
# ->getOption()
 -  returns the value of an option
 -  returns null if the option does not exist
# ->addOption()
 -  adds a new option to a validator
# ->getOptions() ->setOptions()
 -  changes all options
# ->getMessages()
 -  returns an array of all error messages
# ->getMessage()
 -  returns an error message string
 -  returns an empty string if the message does not exist
# ->setMessage()
 -  changes the default error message string
 -  throws an InvalidArgumentException if the message is not registered
# ->setMessages()
 -  changes all error messages
# ->addMessage()
 -  adds a new error code
# ->getErrorCodes()
 -  returns an array of error codes the validator can use
# ::getCharset() ::setCharset()
 -  returns the charset to use for validators
 -  changes the charset to use for validators
# ->asString()
 -  returns a string representation of the validator
 -  returns a string representation of the validator
 -  returns a string representation of the validator
 -  returns a string representation of the validator
# ::setDefaultMessage()
 -  sets the default message for an error
 -  sets the default message for an error
 -  sets the default message for an error
 -  is ignored if the validator explicitly overrides the message
 -  is ignored if the validator explicitly overrides the message
# Looks like everything went fine.