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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
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.

package org.apache.sshd.server.command;

import java.util.ArrayList;
import java.util.List;

import org.apache.sshd.server.Command;
import org.apache.sshd.server.CommandFactory;

 * This <code>CommandFactory</code> can be used as a standalone command factory
 * or can be used to augment another <code>CommandFactory</code> and provides
 * <code>SCP</code> support.
 * @see ScpCommand
 * @author <a href="">Apache MINA SSHD Project</a>

public class ScpCommandFactory implements CommandFactory {

    private CommandFactory delegate;

    public ScpCommandFactory() {

    public ScpCommandFactory(CommandFactory delegate) {
        this.delegate = delegate;

     * Parses a command string and verifies that the basic syntax is
     * correct. If parsing fails the responsibility is delegated to
     * the configured {@link CommandFactory} instance; if one exist.
     * @param command command to parse
     * @return configured {@link Command} instance
     * @throws IllegalArgumentException

    public Command createCommand(String command) {
        try {
            if (!command.startsWith("scp")) {
                throw new IllegalArgumentException("Unknown command, does not begin with 'scp'");
            return new ScpCommand(command);
        } catch (IllegalArgumentException iae) {
            if (delegate != null) {
                return delegate.createCommand(command);
            throw iae;