Created
May 22, 2020 12:02
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Final encoded email filter
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object final_encoded_email_filter { | |
final case class Address(emailAddress: String) | |
final case class Email(sender: Address, to: List[Address], subject: String, body: String) | |
case class EmailFilter(run: Email => Boolean) { self => | |
def &&(that: EmailFilter): EmailFilter = EmailFilter(email => self.run(email) && that.run(email)) | |
def ||(that: EmailFilter): EmailFilter = EmailFilter(email => self.run(email) || that.run(email)) | |
def negate : EmailFilter = EmailFilter(email => !self.run(email)) | |
} | |
object EmailFilter { | |
val always: EmailFilter = EmailFilter(_ => true) | |
val never: EmailFilter = always.negate | |
def senderIs(sender: Address): EmailFilter = EmailFilter(email => email.sender == sender) | |
def senderIsNot(sender: Address): EmailFilter = senderIs(sender).negate | |
def recipientIs(recipient: Address): EmailFilter = EmailFilter(email => email.to.contains(recipient)) | |
def recipientIsNot(recipient: Address): EmailFilter = recipientIs(recipient).negate | |
def senderIn(senders: Set[Address]): EmailFilter = senders.foldLeft(never)(_ || senderIs(_)) | |
def recipientIn(recipients: Set[Address]): EmailFilter = recipients.foldLeft(never)(_ || recipientIs(_)) | |
def bodyContains(phrase: String): EmailFilter = EmailFilter(email => email.body.contains(phrase)) | |
def bodyDoesNotContain(phrase: String): EmailFilter = bodyContains(phrase).negate | |
} | |
val filter: EmailFilter = EmailFilter.senderIsNot(Address("me@gmail.com")) && EmailFilter.bodyContains("Unsubscribe") | |
val emails: List[Email] = List(Email(Address("info@someretailer.com"), List(Address("me@gmail.com")), "Promotion", "10% off. Unsubscribe")) | |
val newsletters: List[Email] = emails.filter(filter.run) | |
} |
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