/*
* Syncany, www.syncany.org
* Copyright (C) 2011-2016 Philipp C. Heckel <philipp.heckel@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.syncany.cli;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.syncany.util.StringUtil;
/**
* The command factory can be used to instantiate a new command from a
* command name. The {@link CommandLineClient} uses this class to create
* and run commands by mapping a command argument to a corresponding
* {@link Command} class.
*
* @author Philipp C. Heckel <philipp.heckel@gmail.com>
*/
public class CommandFactory {
private static final Logger logger = Logger.getLogger(CommandFactory.class.getSimpleName());
/**
* Maps the given command name to a corresponding {@link Command} class and
* instantiates it. The command name is camel-cased and mapped to a FQCN.
*
* <p>Example: The command 'ls-remote' is mapped to the FQCN
* <tt>org.syncany.cli.LsRemoteCommand</tt>.
*
* @param commandName Command name, e.g. ls-remote or init
* @return Returns a <tt>Command</tt> instance, or <tt>null</tt> if the command name cannot be mapped to a class
*/
public static Command getInstance(String commandName) {
String thisPackage = CommandFactory.class.getPackage().getName();
String camelCaseCommandName = StringUtil.toCamelCase(commandName);
String fqCommandClassName = thisPackage+"."+camelCaseCommandName+Command.class.getSimpleName();
// Try to load!
try {
Class<?> commandClass = Class.forName(fqCommandClassName);
return (Command) commandClass.newInstance();
}
catch (Exception ex) {
logger.log(Level.INFO, "Could not find operation FQCN " + fqCommandClassName, ex);
return null;
}
}
}