Lookup data in any data reader
/*
* Copyright (c) 2006-2008 North Concepts Inc. All rights reserved.
* Proprietary and Confidential. Use is subject to license terms.
*
* http://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.FieldList;
import com.northconcepts.datapipeline.core.StreamWriter;
import com.northconcepts.datapipeline.csv.CSVReader;
import com.northconcepts.datapipeline.job.JobTemplate;
import com.northconcepts.datapipeline.transform.TransformingReader;
import com.northconcepts.datapipeline.transform.lookup.DataReaderLookup;
import com.northconcepts.datapipeline.transform.lookup.Lookup;
import com.northconcepts.datapipeline.transform.lookup.LookupTransformer;
public class LookupDataInAnyDataReader {
public static void main(String[] args) throws Throwable {
DataReader reader = new CSVReader(new File("credit-balance.csv"))
.setFieldNamesInFirstRow(true);
TransformingReader transformingReader = new TransformingReader(reader);
/* This lookup matches
* [credit-balance.csv].[Rating] to [rating-table.csv].[rating_code]
* to return
* [rating-table.csv].[rating_description]
*/
Lookup lookup = new DataReaderLookup(
new CSVReader(new File("rating-table.csv"))
.setFieldNamesInFirstRow(true),
new FieldList().add("rating_code"),
new FieldList().add("rating_description")
);
transformingReader.add(new LookupTransformer(
new FieldList().add("Rating"),
lookup
));
JobTemplate.DEFAULT.transfer(transformingReader, new StreamWriter(System.out));
}
}
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