haveno/gui/src/main/java/io/bitsquare/app/BitsquareExecutable.java

/*
 * This file is part of Bitsquare.
 *
 * Bitsquare is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * Bitsquare is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Bitsquare. If not, see <http://www.gnu.org/licenses/>.
 */

package io.bitsquare.app;

import joptsimple.OptionException;
import joptsimple.OptionParser;
import joptsimple.OptionSet;
import org.springframework.util.StringUtils;

import static java.lang.String.*;

public abstract class BitsquareExecutable {
    public static final int EXIT_SUCCESS = 0;
    public static final int EXIT_FAILURE = 1;
    public static final String HELP_KEY = "help";

    public void execute(String[] args) throws Exception {
        OptionParser parser = new OptionParser();
        parser.accepts(HELP_KEY, "This help text").forHelp();

        this.customizeOptionParsing(parser);

        OptionSet options;
        try {
            options = parser.parse(args);
            if (options.has(HELP_KEY)) {
                parser.printHelpOn(System.out);
                System.exit(EXIT_SUCCESS);
                return;
            }
        } catch (OptionException ex) {
            System.out.println("error: " + ex.getMessage());
            System.out.println();
            parser.printHelpOn(System.out);
            System.exit(EXIT_FAILURE);
            return;
        }

        this.doExecute(options);
    }

    protected abstract void customizeOptionParsing(OptionParser parser);

    protected static String description(String descText, Object defaultValue) {
        String description = "";
        if (StringUtils.hasText(descText))
            description = description.concat(descText);
        if (defaultValue != null)
            description = join(" ", description, format("(default: %s)", defaultValue));
        return description;
    }

    protected abstract void doExecute(OptionSet options);
}