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Ftplets are, similar to servlets, an API to plug into the request lifecycle of FtpServer. Ftplets are called on session connect and disconnect as well as before and after each command within a user session.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.ftpserver.ftplet;

/**
 * Type safe enum for describing the structure
 *
 * @author Apache MINA Project
 */
public enum Structure {

    /**
     * File structure
     */
    FILE;

    /**
     * Parses the argument value from the STRU command into the type safe class
     * 
     * @param argument
     *            The argument value from the STRU command. Not case sensitive
     * @return The appropriate structure
     * @throws IllegalArgumentException
     *             If the structure is unknown
     */

    public static Structure parseArgument(char argument) {
        switch (argument) {
        case 'F':
        case 'f':
            return FILE;
        default:
            throw new IllegalArgumentException("Unknown structure: " + argument);
        }
    }
}