de.uniulm.omi.cloudiator.visor.config.CommandLinePropertiesAccessorImpl.java Source code

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Here is the source code for de.uniulm.omi.cloudiator.visor.config.CommandLinePropertiesAccessorImpl.java

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/*
 * Copyright (c) 2014-2015 University of Ulm
 *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership.  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 de.uniulm.omi.cloudiator.visor.config;

import com.google.inject.Inject;
import org.apache.commons.cli.*;

import javax.annotation.Nullable;
import javax.inject.Singleton;

import static com.google.common.base.Preconditions.checkState;

/**
 * Created by daniel on 24.09.14.
 */
@SuppressWarnings("AccessStaticViaInstance")
public class CommandLinePropertiesAccessorImpl implements CommandLinePropertiesAccessor {

    private final Options options;
    private CommandLine commandLine;
    private final static BasicParser parser = new BasicParser();
    private final static HelpFormatter helpFormatter = new HelpFormatter();

    @Inject
    @Singleton
    public CommandLinePropertiesAccessorImpl(String[] args) {
        this.options = new Options();
        this.generateOptions(this.options);

        try {
            this.commandLine = this.parser.parse(options, args);
        } catch (ParseException e) {
            this.commandLine = null;
            throw new ConfigurationException(e);
        }
    }

    private void generateOptions(Options options) {
        options.addOption(OptionBuilder.withLongOpt("localIp").withDescription("IP of the local machine").hasArg()
                .create("ip"));
        options.addOption(OptionBuilder.withLongOpt("configFile").withDescription("Configuration file location.")
                .isRequired().hasArg().create("conf"));
    }

    public void printHelp() {
        helpFormatter.printHelp("java -jar [args] visor.jar", options);
    }

    @Nullable
    protected String getCommandLineOption(String name) {
        checkState(this.commandLine != null, "Command line not parsed.");
        if (!commandLine.hasOption(name)) {
            return null;
        }
        return commandLine.getOptionValue(name);
    }

    @Override
    public String getConfFileLocation() {
        String confFile = this.getCommandLineOption("conf");
        checkState(confFile != null, "No command line argument value for conf (configFile)");
        return confFile;
    }

    @Override
    @Nullable
    public String getPublicIp() {
        return getCommandLineOption("ip");
    }
}