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Versions: 26
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Contents
module ROM
module Commands
# Abstract result class for success and error results
#
# @api public
class Result
# Return command execution result
#
# @api public
attr_reader :value
# Return potential command execution result error
#
# @api public
attr_reader :error
# Coerce result to an array
#
# @abstract
#
# @api public
def to_ary
raise NotImplementedError
end
alias_method :to_a, :to_ary
# Return true if command successful
#
# @api public
def success?
is_a?(Success)
end
# Return true if command failed
#
# @api public
def failure?
is_a?(Failure)
end
# Success result has a value and no error
#
# @api public
class Success < Result
# @api private
def initialize(value)
@value = value.is_a?(self.class) ? value.value : value
end
# Call next command on continuation
#
# @api public
def >(other)
other.call(value)
end
# Return the value
#
# @return [Array]
#
# @api public
def to_ary
value.to_ary
end
end
# Failure result has an error and no value
#
# @api public
class Failure < Result
# @api private
def initialize(error)
@error = error
end
# Do not call next command on continuation
#
# @return [self]
#
# @api public
def >(_other)
self
end
# Return the error
#
# @return [Array<CommandError>]
#
# @api public
def to_ary
error
end
end
end
end
end
Version data entries
26 entries across 26 versions & 2 rubygems