From 063284837c8c366e5502b1b0264b8eb807b61732 Mon Sep 17 00:00:00 2001
From: Joe Robinson <joe@lc8n.com>
Date: Wed, 27 Oct 2010 14:21:09 +0100
Subject: Basic upload functionality to predifined location, with basic file
 browser

---
 org/apache/commons/net/time/TimeUDPClient.java | 127 +++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 org/apache/commons/net/time/TimeUDPClient.java

(limited to 'org/apache/commons/net/time/TimeUDPClient.java')

diff --git a/org/apache/commons/net/time/TimeUDPClient.java b/org/apache/commons/net/time/TimeUDPClient.java
new file mode 100644
index 0000000..f58d96e
--- /dev/null
+++ b/org/apache/commons/net/time/TimeUDPClient.java
@@ -0,0 +1,127 @@
+/*
+ * 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.time;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.InetAddress;
+import java.util.Date;
+
+import org.apache.commons.net.DatagramSocketClient;
+
+/***
+ * The TimeUDPClient class is a UDP implementation of a client for the
+ * Time protocol described in RFC 868.  To use the class, merely
+ * open a local datagram socket with
+ * {@link org.apache.commons.net.DatagramSocketClient#open  open }
+ * and call {@link #getTime  getTime } or
+ * {@link #getTime  getDate } to retrieve the time. Then call
+ * {@link org.apache.commons.net.DatagramSocketClient#close  close }
+ * to close the connection properly.  Unlike
+ * {@link org.apache.commons.net.time.TimeTCPClient},
+ * successive calls to {@link #getTime  getTime } or
+ * {@link #getDate  getDate } are permitted
+ * without re-establishing a connection.  That is because UDP is a
+ * connectionless protocol and the Time protocol is stateless.
+ * <p>
+ * <p>
+ * @author Daniel F. Savarese
+ * @see TimeTCPClient
+ ***/
+
+public final class TimeUDPClient extends DatagramSocketClient
+{
+    /*** The default time port.  It is set to 37 according to RFC 868. ***/
+    public static final int DEFAULT_PORT = 37;
+
+    /***
+     * The number of seconds between 00:00 1 January 1900 and
+     * 00:00 1 January 1970.  This value can be useful for converting
+     * time values to other formats.
+     ***/
+    public static final long SECONDS_1900_TO_1970 = 2208988800L;
+
+    private byte[] __dummyData = new byte[1];
+    private byte[] __timeData = new byte[4];
+
+    /***
+     * Retrieves the time from the specified server and port and
+     * returns it. The time is the number of seconds since
+     * 00:00 (midnight) 1 January 1900 GMT, as specified by RFC 868.
+     * This method reads the raw 32-bit big-endian
+     * unsigned integer from the server, converts it to a Java long, and
+     * returns the value.
+     * <p>
+     * @param host The address of the server.
+     * @param port The port of the service.
+     * @return The time value retrieved from the server.
+     * @exception IOException If an error occurs while retrieving the time.
+     ***/
+    public long getTime(InetAddress host, int port) throws IOException
+    {
+        long time;
+        DatagramPacket sendPacket, receivePacket;
+
+        sendPacket =
+            new DatagramPacket(__dummyData, __dummyData.length, host, port);
+        receivePacket = new DatagramPacket(__timeData, __timeData.length);
+
+        _socket_.send(sendPacket);
+        _socket_.receive(receivePacket);
+
+        time = 0L;
+        time |= (((__timeData[0] & 0xff) << 24) & 0xffffffffL);
+        time |= (((__timeData[1] & 0xff) << 16) & 0xffffffffL);
+        time |= (((__timeData[2] & 0xff) << 8) & 0xffffffffL);
+        time |= ((__timeData[3] & 0xff) & 0xffffffffL);
+
+        return time;
+    }
+
+    /*** Same as <code> getTime(host, DEFAULT_PORT); </code> ***/
+    public long getTime(InetAddress host) throws IOException
+    {
+        return getTime(host, DEFAULT_PORT);
+    }
+
+
+    /***
+     * Retrieves the time from the server and returns a Java Date
+     * containing the time converted to the local timezone.
+     * <p>
+     * @param host The address of the server.
+     * @param port The port of the service.
+     * @return A Date value containing the time retrieved from the server
+     *     converted to the local timezone.
+     * @exception IOException  If an error occurs while fetching the time.
+     ***/
+    public Date getDate(InetAddress host, int port) throws IOException
+    {
+        return new Date((getTime(host, port) - SECONDS_1900_TO_1970)*1000L);
+    }
+
+
+    /*** Same as <code> getTime(host, DEFAULT_PORT); </code> ***/
+    public Date getDate(InetAddress host) throws IOException
+    {
+        return new Date((getTime(host, DEFAULT_PORT) -
+                         SECONDS_1900_TO_1970)*1000L);
+    }
+
+}
+
-- 
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