com.butor.netty.handler.codec.ftp.cmd.CommandExecutionTemplate.java Source code

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Here is the source code for com.butor.netty.handler.codec.ftp.cmd.CommandExecutionTemplate.java

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/**
 * Copyright (C) 2013 codingtony (t.bussieres@gmail.com)
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.butor.netty.handler.codec.ftp.cmd;

import io.netty.channel.ChannelHandlerContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class CommandExecutionTemplate {

    protected final Logger logger = LoggerFactory.getLogger(getClass());

    public abstract FTPCommand getFTPCommand(String cmd);

    public final void executeCommand(ChannelHandlerContext ctx, String cmd, String args) {
        //TODO handle properly FTP States see p.53 RFC 959
        FTPCommand command = getFTPCommand(cmd);
        if (command != null) {
            Boolean loggedIn = ctx.attr(FTPAttrKeys.LOGGED_IN).setIfAbsent(false);
            loggedIn = ctx.attr(FTPAttrKeys.LOGGED_IN).get();
            boolean isLogonCommand = command instanceof LogonCommand;
            if ((!loggedIn && isLogonCommand) || (loggedIn && !isLogonCommand)) {
                command.execute(ctx, args);
                ctx.attr(FTPAttrKeys.LAST_COMMAND).set(command);
                return;
            }
        }

        logger.debug("Command not supported {} {}", cmd, args);
        CommandUtil.send("500 Command not supported", ctx);

    }

}