org.drools.examples.PricingRuleDTExample Maven / Gradle / Ivy

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package org.drools.examples;

import java.util.Arrays;

import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.DecisionTableConfiguration;
import org.drools.builder.DecisionTableInputType;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.examples.decisiontable.Driver;
import org.drools.examples.decisiontable.Policy;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatelessKnowledgeSession;

/**
 * This shows off a decision table.
 */
public class PricingRuleDTExample {

    public static final void main(String[] args) throws Exception {
        PricingRuleDTExample launcher = new PricingRuleDTExample();
        launcher.executeExample();
    }

    public int executeExample() throws Exception {

        DecisionTableConfiguration dtableconfiguration = KnowledgeBuilderFactory.newDecisionTableConfiguration();
        dtableconfiguration.setInputType( DecisionTableInputType.XLS );

        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

        kbuilder.add( ResourceFactory.newClassPathResource( "ExamplePolicyPricing.xls",
                                                            getClass() ),
                      ResourceType.DTABLE,
                      dtableconfiguration );

        if ( kbuilder.hasErrors() ) {
            System.err.print( kbuilder.getErrors() );
            return -1;
        }

        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );

        // typical decision tables are used statelessly
        StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession();

        //now create some test data
        Driver driver = new Driver();
        Policy policy = new Policy();

        ksession.execute( Arrays.asList( new Object[]{driver, policy} ) );

        System.out.println( "BASE PRICE IS: " + policy.getBasePrice() );
        System.out.println( "DISCOUNT IS: " + policy.getDiscountPercent() );

        return policy.getBasePrice();

    }

}