Set a Calculated Field at Runtime
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.examples.cookbook; import java.io.File; import com.northconcepts.datapipeline.core.DataReader; import com.northconcepts.datapipeline.core.StreamWriter; import com.northconcepts.datapipeline.csv.CSVReader; import com.northconcepts.datapipeline.job.Job; import com.northconcepts.datapipeline.transform.SetCalculatedField; import com.northconcepts.datapipeline.transform.TransformingReader; public class SetACalculatedFieldAtRuntime { public static void main(String[] args) throws Throwable { DataReader reader = new CSVReader(new File("example/data/input/credit-balance-01.csv")) .setFieldNamesInFirstRow(true); // Since CSV fields are strings, they need to be parsed before subtraction reader = new TransformingReader(reader) .add(new SetCalculatedField("AvailableCredit", "parseDouble(CreditLimit) - parseDouble(Balance)")); Job.run(reader, new StreamWriter(System.out)); } }