nz.co.senanque.pizzaorder.rules.R5 Maven / Gradle / Ivy

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This is a rules-driven pizza configuration which lets you pick different pizza bases, toppings and sizes, except that only some combinations are allowed and the rules enforce this. The rules, UI and underlying domain objects are all delivered by this sub-application.

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package nz.co.senanque.pizzaorder.rules;

import java.io.Serializable;
import nz.co.senanque.pizzaorder.instances.Order;
import nz.co.senanque.rules.FieldReference;
import nz.co.senanque.rules.NotTrueException;
import nz.co.senanque.rules.Operations;
import nz.co.senanque.rules.Rule;
import nz.co.senanque.rules.RuleContext;
import nz.co.senanque.rules.RuleProxyField;
import nz.co.senanque.rules.RuleSession;
import nz.co.senanque.rules.UnKnownFieldValueException;
import nz.co.senanque.validationengine.ListeningArray;
import nz.co.senanque.validationengine.ValidationObject;
import org.springframework.stereotype.Component;


/**
 * rule:Order shoppingcartsize
 * {if
 * (count((pizzas)==0){
 * orderStatus=format((shopping.cart.status.empty,0);}}
 * 
 */
@Component
public class R5
    implements Serializable, Rule
{

    private final static long serialVersionUID = 1L;

    public void evaluate(final RuleSession session, final ValidationObject object, final RuleContext ruleContext) {
        final Operations operations = session.getOperations();
        final RuleProxyField proxyFieldorderStatus = session.getRuleProxyField(session.getMetadata(object).getProxyField("orderStatus"));
        final RuleProxyField proxyFieldpizzas = session.getRuleProxyField(session.getMetadata(object).getProxyField("pizzas"));
        try {
            try {
                operations.checkTrue(operations.eq(0L, operations.count(((ListeningArray) proxyFieldpizzas.getValue()))));
            } catch (NotTrueException _x) {
                return ;
            }
            session.assign(ruleContext, operations.format(0L, "shopping.cart.status.empty"), proxyFieldorderStatus);
        } catch (UnKnownFieldValueException _x) {
            return ;
        }
    }

    public String getRuleName() {
        return "R5:shoppingcartsize";
    }

    public String getMessage(final RuleSession session, final ValidationObject object) {
        return session.getMessage("nz.co.senanque.pizzaorder.rules.R5", new Object[] { });
    }

    public String toString() {
        return "R5:shoppingcartsize";
    }

    public String getClassName() {
        return "Order";
    }

    public Class getScope() {
        return Order.class;
    }

    public FieldReference[] listeners() {
        return new FieldReference[] {new FieldReference("Order", "Order", "pizzas")};
    }

    public FieldReference[] outputs() {
        return new FieldReference[] {new FieldReference("Order", "Order", "orderStatus")};
    }

}