org.apache.tez.mapreduce.examples.helpers.SplitsInClientOptionParser.java Source code

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Here is the source code for org.apache.tez.mapreduce.examples.helpers.SplitsInClientOptionParser.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 org.apache.tez.mapreduce.examples.helpers;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

import com.google.common.base.Preconditions;

public class SplitsInClientOptionParser {

    private CommandLine cmdLine;
    private String[] otherArgs;

    private boolean parsed = false;

    public SplitsInClientOptionParser() {

    }

    public String[] getRemainingArgs() {
        Preconditions.checkState(parsed, "Cannot get remaining args without parsing");
        return otherArgs.clone();
    }

    @SuppressWarnings("static-access")
    public boolean parse(String[] args, boolean defaultVal) throws ParseException {
        Preconditions.checkState(parsed == false, "Craete a new instance for different option sets");
        parsed = true;
        Options opts = new Options();
        Option opt = OptionBuilder.withArgName("splits_in_client").hasArg()
                .withDescription("specify whether splits should be generated in the client")
                .create("generateSplitsInClient");
        opts.addOption(opt);
        CommandLineParser parser = new GnuParser();

        cmdLine = parser.parse(opts, args, false);
        if (cmdLine.hasOption("generateSplitsInClient")) {
            defaultVal = Boolean.parseBoolean(cmdLine.getOptionValue("generateSplitsInClient"));
        }
        otherArgs = cmdLine.getArgs();
        return defaultVal;
    }

}