Chapter 14. Functions

function String hello(String name) {
    return "Hello "+name+"!";
}

import function my.package.Foo.hello

rule "using a static function"
when 
    eval( true )
then
    System.out.println( hello( "Bob" ) );
end

declare Address
   number : int
   streetName : String
   city : String
end

declare Person
    name : String
    dateOfBirth : java.util.Date
    address : Address
end

import java.util.Date

declare Person
    name : String
    dateOfBirth : Date
    address : Address
end

public class Person implements Serializable {
    private String name;
    private java.util.Date dateOfBirth;
    private Address address;

    // empty constructor
    public Person() {...}

    // constructor with all fields 
    public Person( String name, Date dateOfBirth, Address address ) {...}

    // if keys are defined, constructor with keys
    public Person( ...keys... ) {...}

    // getters and setters
    // equals/hashCode
    // toString
}

rule "Using a declared Type"
when 
    $p : Person( name == "Bob" )
then
    // Insert Mark, who is Bob's manager.
    Person mark = new Person();
    mark.setName("Mark");
    insert( mark );
end

@metadata_key( metadata_value )

import java.util.Date

declare Person
    @author( Bob )
    @dateOfCreation( 01-Feb-2009 )

    name : String @key @maxLength( 30 )
    dateOfBirth : Date 
    address : Address
end

declare Cheese
    name : String @position(1)
    shop : String @position(2)
    price : int @position(0)
end

declare Person
    firstName : String @key
    lastName : String @key
    age : int
end

Person person = new Person( "John", "Doe" );

declare Cheese
    name : String
    shop : String
    price : int
end

declare Cheese
    name : String @position(1)
    shop : String @position(2)
    price : int @position(0)
end

Cheese( "stilton", "Cheese Shop", p; )
Cheese( "stilton", "Cheese Shop"; p : price )
Cheese( "stilton"; shop == "Cheese Shop", p : price )
Cheese( name == "stilton"; shop == "Cheese Shop", p : price )