Grules is a rule engine for data preprocessing. The rules are specified via internal Groovy DSL, which has a concise and simple syntax. For example:
// isEmail is a Groovy/Java method that takes an email value as its parameter
email isEmail ["Invalid email"]
// invalidLoginMessage and dupLoginMessage are String error messages
login isLogin [invalidLoginMessage] >> isUnique [dupLoginMessage]
// The value gender defaults to "MALE"
gender["MALE"] toEnum(Gender)
// agreeToTerms is a message from a resource bundle
termsCondition[""] !isEmpty [m.agreeToTerms]
// you can use closures as well
weight toPositiveBigDecimal [decimalErr] >> {round(it / 1000)}
// Grules supports logical operators
endDate isAfterNow && isBefore(deadline) && {it.day != 1}To build the project, you should run the following command in the grules folder:
cd grules
./gradlew
To run hello world example:
cd grulesHelloWorld
./gradlew
Documentation:
Wiki documentation
White paper
Introduction video
Requirements: JVM 8, Groovy 2.3