/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * 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.jboss.as.cli;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 *
 * @author Alexey Loubyansky
 */
public class CommandRegistry {

    private final Map<String, CommandHandler> handlers = new HashMap<String, CommandHandler>();
    private final Set<String> tabCompletionCommands = new HashSet<String>();

    public void registerHandler(CommandHandler handler, String... names) {
        registerHandler(handler, true, names);
    }

    public void registerHandler(CommandHandler handler, boolean tabComplete, String... names) {
        for(String name : names) {
            CommandHandler previous = handlers.put(name, handler);
            if(previous != null)
                throw new IllegalStateException("Duplicate command name '" + name + "'. Handlers: " + previous + ", " + handler);
        }
        if(tabComplete) {
            tabCompletionCommands.add(names[0]);
        }
    }

    public Set<String> getTabCompletionCommands() {
        return tabCompletionCommands;
    }

    public CommandHandler getCommandHandler(String command) {
        return handlers.get(command);
    }

    public CommandHandler remove(String cmdName) {
        if(cmdName == null) {
            throw new IllegalArgumentException();
        }
        CommandHandler handler = handlers.remove(cmdName);
        if(handler != null) {
            tabCompletionCommands.remove(cmdName);
        }
        return handler;
    }
}
