/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.shell.impl.command.system;
import org.crsh.cli.descriptor.Format;
import org.crsh.cli.impl.descriptor.IntrospectionException;
import org.crsh.command.BaseCommand;
import org.crsh.shell.ErrorKind;
import org.crsh.shell.impl.command.spi.CommandException;
import org.crsh.lang.impl.java.ClassShellCommand;
import org.crsh.shell.impl.command.spi.CommandResolver;
import org.crsh.lang.spi.CommandResolution;
import org.crsh.shell.impl.command.spi.Command;
import java.util.HashMap;
import java.util.Map;
/**
* @author Julien Viet
*/
public class SystemResolver implements CommandResolver {
/** . */
public static final SystemResolver INSTANCE = new SystemResolver();
/** . */
private static final HashMap<String, Class<? extends BaseCommand>> commands = new HashMap<String, Class<? extends BaseCommand>>();
/** . */
private static final HashMap<String, String> descriptions = new HashMap<String, String>();
static {
commands.put("help", help.class);
commands.put("repl", repl.class);
descriptions.put("help", "provides basic help");
descriptions.put("repl", "list the repl or change the current repl");
}
private SystemResolver() {
}
@Override
public Iterable<Map.Entry<String, String>> getDescriptions() {
return descriptions.entrySet();
}
@Override
public Command<?> resolveCommand(String name) throws CommandException, NullPointerException {
final Class<? extends BaseCommand> systemCommand = commands.get(name);
if (systemCommand != null) {
return createCommand(systemCommand).getCommand();
}
return null;
}
private <C extends BaseCommand> CommandResolution createCommand(final Class<C> commandClass) throws CommandException {
final ClassShellCommand<C> shellCommand;
final String description;
try {
shellCommand = new ClassShellCommand<C>(commandClass);
description = shellCommand.describe(commandClass.getSimpleName(), Format.DESCRIBE);
}
catch (IntrospectionException e) {
throw new CommandException(ErrorKind.SYNTAX, "Invalid cli annotation in command " + commandClass.getSimpleName(), e);
}
return new CommandResolution() {
@Override
public String getDescription() {
return description;
}
@Override
public Command<?> getCommand() throws CommandException {
return shellCommand;
}
};
}
}