Validation in drools | 易学教程

问题

This is the second part of my drools validation question. First part has been already answered and proposed solutions has been implemented in my code. First Part

This is my java class structure

public class Person {
 List<PersonAddress> personAddress;
 List<FinanceDetails> financeDetails;
}
public enum AddressStatus {
 CURRENT, PREVIOUS;
}
public enum AddressType {
 PHYSICAL, POSTAL;
}
public enum AddressUseType {
 HOME, OFFICE;
}
public class PersonAddress{    
  Address address;
  AddressType type
  AddressStatus status
  AddressUseType useType
  String ownerShipType
  Integer timeAtAddress;        
}
public class Address {
  String city;
  String country;
  String street;
}
public class FinanceDetails {
  String financeItemName;
  BigDecimal itemValue;
}

Ok my problem is, i need to validate itemValue of the FinanceDetails instance if financeItemName is "Land or Building", and if this user has an address which matches following criteria,

AddressStatus == CURRENT

AddressType == PHYSICAL

AddressUseType == HOME

ownerShipType == "Own"

Drools version 5.5.0.Final

Java 1.7

functions can be used

A sample drool rule syntax is needed. Thank you

回答1:

Added itemValue tests as seen in some comment

rule "land-orbuilding..."
when
  Peson( $financeDetails: financeDetails, $personAddress: personAddress )
  FinanceDetails( financeItemName == "Land or Building", itemValue == null || itemValue == 0 ) from $financeDetails
  PersonAddress( status == AddressStatus.CURRENT,
                 type == AddressType.PHYSICAL,
                 useType == AddressUseType.HOME,
                 ownerShipType == "Own" ) from $personAddress
then
  //...
end

How about reading some of that documentation? This is very much like the "first part", and only a minor variation.

回答2:

rule "Check Details"
when
  details:FinanceDetails  (itemValue == 'LAND' || == 'Building')
  address:PersonAddress(status == AddressStatus.CURRENT,
                 type == AddressType.PHYSICAL,
                 useType == AddressUseType.HOME,
                 ownerShipType == "Own" )
then
  modify(details){itemValue=//set your value};
end

来源：https://stackoverflow.com/questions/25735964/validation-in-drools

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drools