Groovy for Domain-specific Languages - Second Edition

Implementing a Rules DSL

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binding.allOf = { closure ->

closure.delegate = delegate

def storeResult = binding.result

def storeAnd = binding.and

binding.result = true // Starting premise is true

binding.and = true

closure()

if (storeAnd) {

binding.result = (storeResult && binding.result)

} else {

binding.result = (storeResult || binding.result)

}

binding.and = storeAnd

}

binding.anyOf = { closure ->

closure.delegate = delegate

def storeResult = binding.result

def storeAnd = binding.and

binding.result = false // Starting premise is false

binding.and = false

closure()

if (storeAnd) {

binding.result = (storeResult && binding.result)

} else {

binding.result = (storeResult || binding.result)

}

binding.and = storeAnd

}

binding.grant = { closure ->

closure.delegate = delegate

if (binding.result)

closure()

}

binding.extend = { days ->

def bbPlus = new BroadbandPlus()

bbPlus.extend( binding.account, binding.media, days)

}

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