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Welcome to the cron-utils wiki! On this page you will find technical and usage details about the project.

Architecture

cron-utils has currently two main components: parser and descriptor. Using two components, we keep parsing and description decoupled, giving us more flexibility to handle specific cases and a wide range of crons as well as making it extensible.

Parser

A builder pattern is used to define custom parsers. A ParserRegistry is provided, where common parsers are defined (unix, cron4j, quartz). The cron parser is responsible for:

• parsing a cron expression
• validate the expression matches required constraints (ex.: special characters, number ranges)
• create a representation of the cron expression

Descriptor

Describes the result from a parsed cron expression. Considers the object model used for cron expression abstraction to provide a description considering a Locale.