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The MockFtpServer project provides mock/dummy FTP server implementations for testing FTP client code. Two FTP Server implementations are provided, each at a different level of abstraction. FakeFtpServer provides a higher-level abstraction. You define a virtual file system, including directories and files, as well as a set of valid user accounts and credentials. The FakeFtpServer then responds with appropriate replies and reply codes based on that configuration. StubFtpServer, on the other hand, is a lower-level "stub" implementation. You configure the individual FTP server commands to return custom data or reply codes, allowing simulation of either success or failure scenarios. You can also verify expected command invocations.

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/*
 * Copyright 2007 the original author or authors.
 * 
 * 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 org.mockftpserver.stub.command;

import org.mockftpserver.core.command.Command;
import org.mockftpserver.core.command.CommandHandler;
import org.mockftpserver.core.command.InvocationRecord;
import org.mockftpserver.core.command.ReplyCodes;
import org.mockftpserver.core.session.Session;
import org.mockftpserver.core.util.Assert;

/**
 * CommandHandler for the SYST (System) command. Send back a reply code of 215. By default,
 * return "WINDOWS" as the system name. You can customize the returned name by
 * setting the systemName property.
 * 
 * See the available system names listed in the Assigned Numbers document
 * (RFC 943).
 * 
 * Each invocation record stored by this CommandHandler contains no data elements.
 *
 * @author Chris Mair
 */
public class SystCommandHandler extends AbstractStubCommandHandler implements CommandHandler {

    private String systemName = "WINDOWS";

    /**
     * Constructor. Initialize the replyCode.
     */
    public SystCommandHandler() {
        setReplyCode(ReplyCodes.SYST_OK);
    }

    public void handleCommand(Command command, Session session, InvocationRecord invocationRecord) {
        sendReply(session, quotes(systemName));
    }

    /**
     * Set the systemName String to be returned by this command
     *
     * @param systemName - the systemName
     */
    public void setSystemName(String systemName) {
        Assert.notNull(systemName, "systemName");
        this.systemName = systemName;
    }

}