Evaluate a Decision Table with Lookup
Updated: Feb 21, 2022
/* * Copyright (c) 2006-2022 North Concepts Inc. All rights reserved. * Proprietary and Confidential. Use is subject to license terms. * * https://northconcepts.com/data-pipeline/licensing/ */ package com.northconcepts.datapipeline.foundations.examples.decisiontable; import com.northconcepts.datapipeline.core.FieldList; import com.northconcepts.datapipeline.core.Record; import com.northconcepts.datapipeline.foundations.decisiontable.DecisionTable; import com.northconcepts.datapipeline.foundations.decisiontable.DecisionTableResult; import com.northconcepts.datapipeline.foundations.decisiontable.DecisionTableRule; import com.northconcepts.datapipeline.internal.expression.DefaultExpressionContext; import com.northconcepts.datapipeline.transform.lookup.BasicLookup; import com.northconcepts.datapipeline.transform.lookup.Lookup; public class EvaluateADecisionTableWithLookup { public static void main(String[] args) { DefaultExpressionContext input = new DefaultExpressionContext(); input.setValue("Price", 159); input.setValue("Currency Code", "cad"); Lookup currencyLookup = new BasicLookup(new FieldList("Currency Name")) .add("CAD", "Canadian Dollars") .add("USD", "American Dollars") .add("EUR", "Euros") .add("GBP", "British Pounds") .add("MXN", "Mexican Pesos") ; DecisionTable table = new DecisionTable() .setValue("currencyLookup", currencyLookup) .addRule(new DecisionTableRule() .addCondition("Price", "? == null || ? < 20") .addOutcome("Shipping", "0.00") .addOutcome("Currency", "lookup(0, currencyLookup, toUpperCase(${Currency Code}))") ) .addRule(new DecisionTableRule() .addCondition("Price", "? < 50") .addOutcome("Shipping", "5.00") .addOutcome("Currency", "lookup(0, currencyLookup, toUpperCase(${Currency Code}))") ) .addRule(new DecisionTableRule() .addCondition("Price", "? < 100") .addOutcome("Shipping", "7.00") .addOutcome("Currency", "lookup(0, currencyLookup, toUpperCase(${Currency Code}))") ) .addRule(new DecisionTableRule() .addCondition("Price", "? >= 100") .addOutcome("Shipping", "${Price} * 0.10") .addOutcome("Currency", "lookup(0, currencyLookup, toUpperCase(${Currency Code}))") ) ; DecisionTableResult result = table.evaluate(input); Record outcome = result.getOutcome(); System.out.println("outcome = " + outcome); } }