com.liveramp.hank.util.CliUtils.java Source code

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Here is the source code for com.liveramp.hank.util.CliUtils.java

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/**
 *  Copyright 2011 LiveRamp
 *
 *  Licensed 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.liveramp.hank.util;

import java.io.File;
import java.io.IOException;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.MissingArgumentException;
import org.apache.commons.cli.MissingOptionException;
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 org.apache.commons.cli.Parser;
import org.apache.commons.lang.StringUtils;

public class CliUtils {
    public static final Option ZK_OPTION = buildOneArgOption("zk",
            "comma delimited string of host:ports for the ZooKeeper service", "ensemble", true,
            "quorum-connect-string");

    private static final Option HELP_OPTION = new Option("help", "print usage");

    @SuppressWarnings("static-access")
    public static Option buildOneArgOption(String name, String description, String argName, boolean required,
            String longOpt) {
        return OptionBuilder.withArgName(argName).hasArg().isRequired(required).withDescription(description)
                .withLongOpt(longOpt).create(name);
    }

    public static CommandLine parseAndHelp(String appName, Options options, String[] args) {
        options.addOption(HELP_OPTION);

        Parser parser = new GnuParser();
        CommandLine line = null;
        try {
            line = parser.parse(options, args);
        } catch (MissingOptionException e) {
            new HelpFormatter().printHelp(appName, options, true);
            throw new IllegalArgumentException();
        } catch (MissingArgumentException e) {
            new HelpFormatter().printHelp(appName, options, true);
            throw new IllegalArgumentException();
        } catch (ParseException e) {
            System.err.println("Unexpected Exception: " + e);
            throw new IllegalArgumentException();
        }

        if (line.hasOption("help")) {
            new HelpFormatter().printHelp(appName, options, true);
            throw new IllegalArgumentException();
        }

        return line;
    }

    public static String fileToString(String fileName) {
        if (fileName == null || StringUtils.isBlank(fileName)) {
            return "";
        }

        File file = new File(fileName);
        String content = "";
        try {
            content = FsUtils.readFileToString(file);
        } catch (IOException e) {
            System.err.println(e.toString());
            System.exit(1);
        }
        return content;
    }
}