org.apache.mahout.classifier.bayes.mapreduce.common.JobExecutor.java Source code

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.mahout.classifier.bayes.mapreduce.common;

import java.io.IOException;

import org.apache.commons.cli2.CommandLine;
import org.apache.commons.cli2.Group;
import org.apache.commons.cli2.Option;
import org.apache.commons.cli2.OptionException;
import org.apache.commons.cli2.builder.GroupBuilder;
import org.apache.commons.cli2.commandline.Parser;
import org.apache.hadoop.fs.Path;
import org.apache.mahout.classifier.bayes.BayesParameters;
import org.apache.mahout.classifier.bayes.mapreduce.bayes.BayesDriver;
import org.apache.mahout.common.CommandLineUtil;
import org.apache.mahout.common.commandline.DefaultOptionCreator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Base class for executing the Bayes Map/Reduce Jobs
 * 
 */
public final class JobExecutor {
    /** Logger for this class. */
    private static final Logger log = LoggerFactory.getLogger(BayesDriver.class);

    private JobExecutor() {
    }

    /**
     * Execute a bayes classification job. Input and output path are parsed from the input parameters.
     * 
     * @param args
     *          input parameters.
     * @param job
     *          the job to execute.
     * @throws Exception
     *           any exception thrown at job execution.
     * */
    public static void execute(String[] args, BayesJob job) throws IOException {
        GroupBuilder gbuilder = new GroupBuilder();

        Option inputOpt = DefaultOptionCreator.inputOption().create();
        Option outputOpt = DefaultOptionCreator.outputOption().create();
        Option helpOpt = DefaultOptionCreator.helpOption();

        Group group = gbuilder.withName("Options").withOption(inputOpt).withOption(outputOpt).withOption(helpOpt)
                .create();

        try {
            Parser parser = new Parser();
            parser.setGroup(group);
            CommandLine cmdLine = parser.parse(args);

            if (cmdLine.hasOption(helpOpt)) {
                CommandLineUtil.printHelp(group);
                return;
            }

            Path input = new Path(cmdLine.getValue(inputOpt).toString());
            Path output = new Path(cmdLine.getValue(outputOpt).toString());

            BayesParameters bayesParams = new BayesParameters();
            bayesParams.setGramSize(1);
            job.runJob(input, output, bayesParams);
        } catch (OptionException e) {
            log.error(e.getMessage());
            CommandLineUtil.printHelp(group);
        }
    }
}