    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      https://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.net.daytime;
    019
    020import java.io.IOException;
    021
    022import org.apache.commons.io.IOUtils;
    023import org.apache.commons.net.SocketClient;
    024
    025/**
    026 * 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
    027 * with {@link org.apache.commons.net.SocketClient#connect connect} and call {@link #getTime getTime()} to retrieve the daytime string, then call
    028 * {@link org.apache.commons.net.SocketClient#disconnect disconnect} to close the connection properly.
    029 *
    030 * @see DaytimeUDPClient
    031 */
    032public final class DaytimeTCPClient extends SocketClient {
    033
    034    /**
    035     * The default daytime port {@value} per RFC 867.
    036     */
    037    public static final int DEFAULT_PORT = 13;
    038
    039    /**
    040     * The default DaytimeTCPClient constructor. It merely sets the default port to {@code DEFAULT_PORT}.
    041     */
    042    public DaytimeTCPClient() {
    043        setDefaultPort(DEFAULT_PORT);
    044    }
    045
    046    /**
    047     * Gets the time string from the server and returns it. The server will have closed the connection at this point, so you should call
    048     * {@link org.apache.commons.net.SocketClient#disconnect disconnect} after calling this method. To retrieve another time, you must initiate another
    049     * connection with {@link org.apache.commons.net.SocketClient#connect connect} before calling {@code getTime()} again.
    050     *
    051     * @return The time string retrieved from the server.
    052     * @throws IOException If an error occurs while fetching the time string.
    053     */
    054    public String getTime() throws IOException {
    055        return IOUtils.toString(_input_, getCharset());
    056    }
    057
    058}