ReplaceColumnDriver.java

package org.openflamingo.mapreduce.etl.replace.column;

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.ToolRunner;
import org.openflamingo.mapreduce.core.AbstractJob;
import org.openflamingo.mapreduce.core.Delimiter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

import static org.openflamingo.mapreduce.core.Constants.JOB_FAIL;
import static org.openflamingo.mapreduce.core.Constants.JOB_SUCCESS;

/**
 * 지정한 칼럼의 값을 변경하는 Replace ETL Driver.
 *
 * @author Edward KIM
 * @author Seo Ji Hye
 * @since 0.1
 */
public class ReplaceColumnDriver extends AbstractJob {

	/**
	 * SLF4J API
	 */
	private static final Logger logger = LoggerFactory.getLogger(ReplaceColumnDriver.class);

	public static void main(String[] args) throws Exception {
		int res = ToolRunner.run(new ReplaceColumnDriver(), args);
		System.exit(res);
	}

	@Override
	public int run(String[] args) throws Exception {
		addInputOption();
		addOutputOption();

		addOption("inputDelimiter", "id", "입력 컬럼 구분자", Delimiter.COMMA.getDelimiter());
		addOption("outputDelimiter", "od", "출력 컬럼 구분자", Delimiter.COMMA.getDelimiter());
		addOption("columnSize", "cs", "변경할 컬럼 갯수", true);
		addOption("columnsToReplace", "cr", "변경할 컬럼의 위치(콤마로 구분)", true);
		addOption("fromColumnsValues", "fv", "원본값(콤마로 구분)", true);
		addOption("toColumnsValues", "tv", "변경할 값(콤마로 구분)", true);
		//addOption("replacerClassNames", "r", "Replacer의 클래스명(콤마로 구분)", true);

		Map<String, String> parsedArgs = parseArguments(args);
		if (parsedArgs == null) {
			return JOB_FAIL;
		}

		Job job = prepareJob(
			getInputPath(), getOutputPath(),
			TextInputFormat.class, ReplaceColumnMapper.class,
			NullWritable.class, Text.class,
			TextOutputFormat.class);

		job.getConfiguration().set("inputDelimiter", parsedArgs.get("--inputDelimiter"));
		job.getConfiguration().set("outputDelimiter", parsedArgs.get("--outputDelimiter"));
		job.getConfiguration().set("columnSize", parsedArgs.get("--columnSize"));
		job.getConfiguration().set("columnsToReplace", parsedArgs.get("--columnsToReplace"));
		job.getConfiguration().set("fromColumnsValues", parsedArgs.get("--fromColumnsValues"));
		job.getConfiguration().set("toColumnsValues", parsedArgs.get("--toColumnsValues"));
		// FIXME Replacer is not need yet.
		//job.getConfiguration().set("replacerClassNames", parsedArgs.get("--replacerClassNames"));

		// Run a Hadoop Job
		return job.waitForCompletion(true) ? JOB_SUCCESS : JOB_FAIL;
	}
}