org.apache.hadoop.gateway.GatewayCommandLine.java Source code

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Here is the source code for org.apache.hadoop.gateway.GatewayCommandLine.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.hadoop.gateway;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.PosixParser;
import org.apache.hadoop.gateway.i18n.resources.ResourcesFactory;

import java.io.PrintWriter;

import static org.apache.commons.cli.HelpFormatter.*;

public class GatewayCommandLine {

    public static CommandLine parse(String[] args) throws ParseException {
        CommandLineParser parser = new PosixParser();
        CommandLine commandLine = parser.parse(createCommandLine(), args);
        return commandLine;
    }

    public static void printUsage() {
        PrintWriter printer = new PrintWriter(System.err);
        new HelpFormatter().printUsage(printer, LINE_WIDTH, COMMAND_NAME, createCommandLine());
        printer.flush();
    }

    public static void printHelp() {
        PrintWriter printer = new PrintWriter(System.err);
        new HelpFormatter().printHelp(printer, LINE_WIDTH, COMMAND_NAME, null, createCommandLine(),
                DEFAULT_LEFT_PAD, DEFAULT_DESC_PAD, null);
        printer.flush();
    }

    /** default number of characters per line */
    public static final int LINE_WIDTH = 80;
    /** Name of the command to use in the command line */
    public static final String COMMAND_NAME = "knox";

    public static final String HELP_LONG = "help";
    public static final String HELP_SHORT = "h";

    public static final String VERSION_LONG = "version";
    public static final String VERSION_SHORT = "v";

    public static final String PERSIST_LONG = "persist-master";
    public static final String PERSIST_SHORT = "pm";

    public static final String NOSTART_LONG = "nostart";
    public static final String NOSTART_SHORT = "ns";

    public static final String REDEPLOY_LONG = "redeploy";
    public static final String REDEPLOY_SHORT = "rd";

    private static Options createCommandLine() {
        Options options = new Options();
        options.addOption(HELP_SHORT, HELP_LONG, false, res.helpMessage());
        options.addOption(VERSION_SHORT, VERSION_LONG, false, res.versionHelpMessage());
        Option redeploy = new Option(REDEPLOY_SHORT, REDEPLOY_LONG, true, res.redeployHelpMessage());
        redeploy.setOptionalArg(true);
        options.addOption(redeploy);
        options.addOption(PERSIST_SHORT, PERSIST_LONG, false, res.persistMasterHelpMessage());
        options.addOption(NOSTART_SHORT, NOSTART_LONG, false, res.nostartHelpMessage());
        return options;
    }

    private static GatewayResources res = ResourcesFactory.get(GatewayResources.class);
}