com.gsinnovations.howdah.CommandLineUtil.java Source code

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Here is the source code for com.gsinnovations.howdah.CommandLineUtil.java

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//Taken from Mahout (http://mahout.apache.org)
/**
 * 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.gsinnovations.howdah;

import java.io.PrintWriter;

import org.apache.commons.cli2.Group;
import org.apache.commons.cli2.util.HelpFormatter;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.GenericOptionsParser;

public final class CommandLineUtil {

    private CommandLineUtil() {
    }

    public static void printHelp(Group group) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.setGroup(group);
        formatter.print();
    }

    /**
     * Print the options supported by <code>GenericOptionsParser</code>.
     * In addition to the options supported by the job, passed in as the
     * group parameter.
     *
     * @param group job-specific command-line options.
     */
    public static void printHelpWithGenericOptions(Group group) {
        org.apache.commons.cli.Options ops = new org.apache.commons.cli.Options();
        new GenericOptionsParser(new Configuration(), ops, new String[0]);
        org.apache.commons.cli.HelpFormatter fmt = new org.apache.commons.cli.HelpFormatter();
        fmt.printHelp("<command> [Generic Options] [Job-Specific Options]", "Generic Options:", ops, "");

        PrintWriter pw = new PrintWriter(System.out);
        HelpFormatter formatter = new HelpFormatter();
        formatter.setGroup(group);
        formatter.setPrintWriter(pw);
        formatter.printHelp();
        pw.flush();
    }

}