author | chegar |
Thu, 15 Aug 2013 15:16:31 +0100 | |
changeset 19414 | 931c01c5c3aa |
parent 19069 | 1d9cb0d080e3 |
child 24865 | 09b1d992ca72 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.net; |
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/** |
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* This class represents a datagram packet. |
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* <p> |
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* Datagram packets are used to implement a connectionless packet |
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* delivery service. Each message is routed from one machine to |
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* another based solely on information contained within that packet. |
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* Multiple packets sent from one machine to another might be routed |
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* differently, and might arrive in any order. Packet delivery is |
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* not guaranteed. |
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* |
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* @author Pavani Diwanji |
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* @author Benjamin Renaud |
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* @since JDK1.0 |
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*/ |
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public final |
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class DatagramPacket { |
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/** |
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* Perform class initialization |
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*/ |
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static { |
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java.security.AccessController.doPrivileged( |
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new java.security.PrivilegedAction<Void>() { |
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public Void run() { |
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System.loadLibrary("net"); |
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return null; |
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} |
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}); |
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init(); |
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} |
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/* |
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* The fields of this class are package-private since DatagramSocketImpl |
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* classes needs to access them. |
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*/ |
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byte[] buf; |
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int offset; |
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int length; |
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int bufLength; |
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InetAddress address; |
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int port; |
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/** |
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* Constructs a {@code DatagramPacket} for receiving packets of |
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* length {@code length}, specifying an offset into the buffer. |
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* <p> |
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* The {@code length} argument must be less than or equal to |
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* {@code buf.length}. |
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* |
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* @param buf buffer for holding the incoming datagram. |
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* @param offset the offset for the buffer |
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* @param length the number of bytes to read. |
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* |
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* @since 1.2 |
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*/ |
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public DatagramPacket(byte buf[], int offset, int length) { |
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setData(buf, offset, length); |
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this.address = null; |
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this.port = -1; |
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} |
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/** |
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* Constructs a {@code DatagramPacket} for receiving packets of |
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* length {@code length}. |
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* <p> |
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* The {@code length} argument must be less than or equal to |
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* {@code buf.length}. |
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* |
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* @param buf buffer for holding the incoming datagram. |
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* @param length the number of bytes to read. |
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*/ |
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public DatagramPacket(byte buf[], int length) { |
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this (buf, 0, length); |
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} |
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/** |
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* Constructs a datagram packet for sending packets of length |
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* {@code length} with offset {@code ioffset}to the |
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* specified port number on the specified host. The |
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* {@code length} argument must be less than or equal to |
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* {@code buf.length}. |
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* |
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* @param buf the packet data. |
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* @param offset the packet data offset. |
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* @param length the packet data length. |
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* @param address the destination address. |
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* @param port the destination port number. |
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* @see java.net.InetAddress |
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* |
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* @since 1.2 |
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*/ |
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public DatagramPacket(byte buf[], int offset, int length, |
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InetAddress address, int port) { |
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setData(buf, offset, length); |
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setAddress(address); |
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setPort(port); |
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} |
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/** |
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* Constructs a datagram packet for sending packets of length |
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* {@code length} with offset {@code ioffset}to the |
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* specified port number on the specified host. The |
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* {@code length} argument must be less than or equal to |
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* {@code buf.length}. |
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* |
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* @param buf the packet data. |
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* @param offset the packet data offset. |
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* @param length the packet data length. |
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* @param address the destination socket address. |
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* @throws IllegalArgumentException if address type is not supported |
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* @see java.net.InetAddress |
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* |
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* @since 1.4 |
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*/ |
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public DatagramPacket(byte buf[], int offset, int length, SocketAddress address) { |
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setData(buf, offset, length); |
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setSocketAddress(address); |
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} |
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/** |
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* Constructs a datagram packet for sending packets of length |
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* {@code length} to the specified port number on the specified |
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* host. The {@code length} argument must be less than or equal |
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* to {@code buf.length}. |
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* |
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* @param buf the packet data. |
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* @param length the packet length. |
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* @param address the destination address. |
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* @param port the destination port number. |
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* @see java.net.InetAddress |
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*/ |
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public DatagramPacket(byte buf[], int length, |
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InetAddress address, int port) { |
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this(buf, 0, length, address, port); |
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} |
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/** |
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* Constructs a datagram packet for sending packets of length |
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* {@code length} to the specified port number on the specified |
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* host. The {@code length} argument must be less than or equal |
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* to {@code buf.length}. |
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* |
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* @param buf the packet data. |
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* @param length the packet length. |
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* @param address the destination address. |
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* @throws IllegalArgumentException if address type is not supported |
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* @since 1.4 |
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* @see java.net.InetAddress |
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*/ |
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public DatagramPacket(byte buf[], int length, SocketAddress address) { |
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this(buf, 0, length, address); |
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} |
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/** |
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* Returns the IP address of the machine to which this datagram is being |
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* sent or from which the datagram was received. |
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* |
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* @return the IP address of the machine to which this datagram is being |
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* sent or from which the datagram was received. |
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* @see java.net.InetAddress |
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* @see #setAddress(java.net.InetAddress) |
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*/ |
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public synchronized InetAddress getAddress() { |
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return address; |
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} |
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/** |
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* Returns the port number on the remote host to which this datagram is |
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* being sent or from which the datagram was received. |
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* |
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* @return the port number on the remote host to which this datagram is |
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* being sent or from which the datagram was received. |
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* @see #setPort(int) |
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*/ |
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public synchronized int getPort() { |
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return port; |
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} |
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/** |
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* Returns the data buffer. The data received or the data to be sent |
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* starts from the {@code offset} in the buffer, |
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* and runs for {@code length} long. |
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* |
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* @return the buffer used to receive or send data |
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* @see #setData(byte[], int, int) |
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*/ |
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public synchronized byte[] getData() { |
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return buf; |
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} |
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/** |
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* Returns the offset of the data to be sent or the offset of the |
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* data received. |
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* |
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* @return the offset of the data to be sent or the offset of the |
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* data received. |
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* |
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* @since 1.2 |
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*/ |
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public synchronized int getOffset() { |
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return offset; |
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} |
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/** |
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* Returns the length of the data to be sent or the length of the |
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* data received. |
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* |
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* @return the length of the data to be sent or the length of the |
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* data received. |
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* @see #setLength(int) |
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*/ |
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public synchronized int getLength() { |
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return length; |
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} |
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/** |
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* Set the data buffer for this packet. This sets the |
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* data, length and offset of the packet. |
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* |
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* @param buf the buffer to set for this packet |
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* |
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* @param offset the offset into the data |
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* |
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* @param length the length of the data |
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* and/or the length of the buffer used to receive data |
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* |
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* @exception NullPointerException if the argument is null |
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* |
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* @see #getData |
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* @see #getOffset |
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* @see #getLength |
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* |
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* @since 1.2 |
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*/ |
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public synchronized void setData(byte[] buf, int offset, int length) { |
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/* this will check to see if buf is null */ |
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if (length < 0 || offset < 0 || |
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(length + offset) < 0 || |
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((length + offset) > buf.length)) { |
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throw new IllegalArgumentException("illegal length or offset"); |
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} |
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this.buf = buf; |
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this.length = length; |
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this.bufLength = length; |
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this.offset = offset; |
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} |
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/** |
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* Sets the IP address of the machine to which this datagram |
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* is being sent. |
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* @param iaddr the {@code InetAddress} |
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* @since JDK1.1 |
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* @see #getAddress() |
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*/ |
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public synchronized void setAddress(InetAddress iaddr) { |
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address = iaddr; |
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} |
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/** |
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* Sets the port number on the remote host to which this datagram |
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* is being sent. |
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* @param iport the port number |
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* @since JDK1.1 |
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* @see #getPort() |
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*/ |
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public synchronized void setPort(int iport) { |
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if (iport < 0 || iport > 0xFFFF) { |
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throw new IllegalArgumentException("Port out of range:"+ iport); |
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} |
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port = iport; |
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} |
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/** |
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* Sets the SocketAddress (usually IP address + port number) of the remote |
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* host to which this datagram is being sent. |
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* |
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* @param address the {@code SocketAddress} |
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* @throws IllegalArgumentException if address is null or is a |
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* SocketAddress subclass not supported by this socket |
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* |
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* @since 1.4 |
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* @see #getSocketAddress |
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*/ |
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public synchronized void setSocketAddress(SocketAddress address) { |
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if (address == null || !(address instanceof InetSocketAddress)) |
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throw new IllegalArgumentException("unsupported address type"); |
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InetSocketAddress addr = (InetSocketAddress) address; |
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if (addr.isUnresolved()) |
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throw new IllegalArgumentException("unresolved address"); |
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setAddress(addr.getAddress()); |
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setPort(addr.getPort()); |
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} |
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/** |
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* Gets the SocketAddress (usually IP address + port number) of the remote |
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* host that this packet is being sent to or is coming from. |
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* |
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* @return the {@code SocketAddress} |
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* @since 1.4 |
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* @see #setSocketAddress |
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*/ |
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public synchronized SocketAddress getSocketAddress() { |
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return new InetSocketAddress(getAddress(), getPort()); |
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} |
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/** |
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* Set the data buffer for this packet. With the offset of |
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* this DatagramPacket set to 0, and the length set to |
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* the length of {@code buf}. |
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* |
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* @param buf the buffer to set for this packet. |
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* |
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* @exception NullPointerException if the argument is null. |
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* |
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* @see #getLength |
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* @see #getData |
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* |
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* @since JDK1.1 |
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*/ |
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public synchronized void setData(byte[] buf) { |
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if (buf == null) { |
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throw new NullPointerException("null packet buffer"); |
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} |
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this.buf = buf; |
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this.offset = 0; |
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this.length = buf.length; |
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this.bufLength = buf.length; |
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} |
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/** |
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* Set the length for this packet. The length of the packet is |
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* the number of bytes from the packet's data buffer that will be |
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* sent, or the number of bytes of the packet's data buffer that |
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* will be used for receiving data. The length must be lesser or |
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* equal to the offset plus the length of the packet's buffer. |
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* |
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* @param length the length to set for this packet. |
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* |
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* @exception IllegalArgumentException if the length is negative |
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* of if the length is greater than the packet's data buffer |
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* length. |
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* |
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* @see #getLength |
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* @see #setData |
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* |
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* @since JDK1.1 |
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*/ |
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public synchronized void setLength(int length) { |
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if ((length + offset) > buf.length || length < 0 || |
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(length + offset) < 0) { |
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throw new IllegalArgumentException("illegal length"); |
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} |
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this.length = length; |
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this.bufLength = this.length; |
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} |
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/** |
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* Perform class load-time initializations. |
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*/ |
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private native static void init(); |
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} |