com.avira.couchdoop.ArgsHelper.java Source code

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Here is the source code for com.avira.couchdoop.ArgsHelper.java

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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 com.avira.couchdoop;

import com.avira.couchdoop.exp.ExportArgs;
import org.apache.commons.cli.*;
import org.apache.hadoop.conf.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;

public class ArgsHelper {

    private static final Logger LOGGER = LoggerFactory.getLogger(ArgsHelper.class);

    public static Option getOptionFromArg(Args.ArgDef arg) {
        Option option = new Option(arg.getShortName() + "", arg.getLongName(), arg.hasArg, arg.description);
        option.setRequired(arg.isRequired);
        return option;
    }

    public static void setPropertyFromCliArg(Configuration hadoopConf, CommandLine cl, Args.ArgDef arg) {
        String argValue = cl.getOptionValue(arg.getShortName());

        if (argValue != null) {
            hadoopConf.set(arg.getPropertyName(), argValue);
        }
    }

    public static void loadCliArgsIntoHadoopConf(Configuration hadoopConf, List<Args.ArgDef> argsList,
            String[] cliArgs) throws ArgsException {
        Options options = getCliOptionsFromArgsList(argsList);
        CommandLine cl = ArgsHelper.parseCommandLineArgs(options, cliArgs);
        if (hadoopConf == null || cl == null) {
            throw new RuntimeException("Can't load Cli Args Into Hadoop Conf!");
        }

        for (Args.ArgDef arg : argsList) {
            setPropertyFromCliArg(hadoopConf, cl, arg);
        }
    }

    public static Options getCliOptionsFromArgsList(List<Args.ArgDef> argsList) {
        Options options = new Options();
        for (Args.ArgDef arg : argsList) {
            options.addOption(getOptionFromArg(arg));
        }
        return options;
    }

    private static CommandLine parseCommandLineArgs(Options options, String[] cliArgs) throws ArgsException {
        CommandLineParser parser = new PosixParser();
        CommandLine cl;
        try {
            cl = parser.parse(options, cliArgs);
        } catch (ParseException e) {
            LOGGER.error(e.getMessage());
            HelpFormatter formatter = new HelpFormatter();
            formatter.setOptionComparator(null);
            formatter.printHelp("...", options);

            throw new ArgsException(e);
        }

        return cl;
    }

}