hr.fer.zemris.vhdllab.platform.support.CommandLineArgumentProcessor.java Source code

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Here is the source code for hr.fer.zemris.vhdllab.platform.support.CommandLineArgumentProcessor.java

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 * 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
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package hr.fer.zemris.vhdllab.platform.support;

import hr.fer.zemris.vhdllab.platform.context.Environment;

import org.apache.commons.cli.CommandLine;
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.cli.PosixParser;

public final class CommandLineArgumentProcessor {

    private static final String ENV_OPTION = "env";
    private static final String ENV_DEV = "dev";
    private static final String ENV_PROD = "prod";

    public void processCommandLine(String[] args) {
        CommandLine cmd;
        try {
            cmd = createParser().parse(createOptions(), args);
        } catch (ParseException e) {
            throw new IllegalStateException(e);
        }
        String env = cmd.getOptionValue(ENV_OPTION, ENV_DEV);
        if (env.equals(ENV_DEV)) {
            Environment.setCurrentEnvironment(Environment.DEVELOPMENT);
        } else if (env.equals(ENV_PROD)) {
            Environment.setCurrentEnvironment(Environment.PRODUCTION);
        } else {
            throw new IllegalStateException(
                    "Illegal environment is set. Only " + ENV_DEV + " and " + ENV_PROD + " are permitted!");
        }
    }

    private Parser createParser() {
        return new PosixParser();
    }

    @SuppressWarnings("static-access")
    private Options createOptions() {
        Options options = new Options();
        options.addOption(OptionBuilder.withLongOpt(ENV_OPTION).hasArg().withValueSeparator().create());
        return options;
    }

}