| /* |
| * 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.commons.net.daytime; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| |
| import org.apache.commons.net.SocketClient; |
| |
| /** |
| * The DaytimeTCPClient class is a TCP implementation of a client for the |
| * Daytime protocol described in RFC 867. To use the class, merely |
| * establish a connection with |
| * {@link org.apache.commons.net.SocketClient#connect connect } |
| * and call {@link #getTime getTime() } to retrieve the daytime |
| * string, then |
| * call {@link org.apache.commons.net.SocketClient#disconnect disconnect } |
| * to close the connection properly. |
| * @see DaytimeUDPClient |
| */ |
| public final class DaytimeTCPClient extends SocketClient |
| { |
| /** The default daytime port. It is set to 13 according to RFC 867. */ |
| public static final int DEFAULT_PORT = 13; |
| |
| // Received dates will likely be less than 64 characters. |
| // This is a temporary buffer used while receiving data. |
| private final char[] __buffer = new char[64]; |
| |
| /** |
| * The default DaytimeTCPClient constructor. It merely sets the default |
| * port to <code> DEFAULT_PORT </code>. |
| */ |
| public DaytimeTCPClient () |
| { |
| setDefaultPort(DEFAULT_PORT); |
| } |
| |
| /** |
| * Retrieves the time string from the server and returns it. The |
| * server will have closed the connection at this point, so you should |
| * call |
| * {@link org.apache.commons.net.SocketClient#disconnect disconnect } |
| * after calling this method. To retrieve another time, you must |
| * initiate another connection with |
| * {@link org.apache.commons.net.SocketClient#connect connect } |
| * before calling <code> getTime() </code> again. |
| * |
| * @return The time string retrieved from the server. |
| * @throws IOException If an error occurs while fetching the time string. |
| */ |
| public String getTime() throws IOException |
| { |
| int read; |
| StringBuilder result = new StringBuilder(__buffer.length); |
| BufferedReader reader; |
| |
| reader = new BufferedReader(new InputStreamReader(_input_, getCharset())); |
| |
| while (true) |
| { |
| read = reader.read(__buffer, 0, __buffer.length); |
| if (read <= 0) { |
| break; |
| } |
| result.append(__buffer, 0, read); |
| } |
| |
| return result.toString(); |
| } |
| |
| } |
| |