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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.net.echo;
19  
20  import java.io.InputStream;
21  
22  import org.apache.commons.net.discard.DiscardTCPClient;
23  
24  /**
25   * The EchoTCPClient class is a TCP implementation of a client for the Echo protocol described in RFC 862. To use the class, merely establish a connection with
26   * {@link org.apache.commons.net.SocketClient#connect connect } and call {@link DiscardTCPClient#getOutputStream getOutputStream() } to retrieve the echo output
27   * stream and {@link #getInputStream getInputStream() } to get the echo input stream. Don't close either stream when you're done using them. Rather, call
28   * {@link org.apache.commons.net.SocketClient#disconnect disconnect } to clean up properly.
29   *
30   * @see EchoUDPClient
31   * @see DiscardTCPClient
32   */
33  
34  public final class EchoTCPClient extends DiscardTCPClient {
35      /** The default echo port. It is set to 7 according to RFC 862. */
36      public static final int DEFAULT_PORT = 7;
37  
38      /**
39       * The default EchoTCPClient constructor. It merely sets the default port to <code>DEFAULT_PORT</code>.
40       */
41      public EchoTCPClient() {
42          setDefaultPort(DEFAULT_PORT);
43      }
44  
45      /**
46       * Returns an InputStream from which you may read echoed data from the server. You should NOT close the InputStream when you're finished reading from it.
47       * Rather, you should call {@link org.apache.commons.net.SocketClient#disconnect disconnect } to clean up properly.
48       *
49       * @return An InputStream from which you can read echoed data from the server.
50       */
51      public InputStream getInputStream() {
52          return _input_;
53      }
54  
55  }