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/*
* 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 java.net;
/**
* This class represents a datagram packet which contains data either to be sent
* or received through a {@code DatagramSocket}. It holds additional information
* such as its source or destination host.
*
* @see DatagramSocket
*/
public final class DatagramPacket {
private byte[] data;
/**
* Length of the data to be sent or size of data that was received via
* DatagramSocket#receive() method call.
*/
private int length;
/**
* The last user-supplied length (as opposed to a length set by simply receiving a packet).
* This length (unlike 'length') is sticky, and survives until the user sets another length.
* It's used to limit the amount of data that will be taken from future packets.
*/
private int userSuppliedLength;
private InetAddress address;
private int port = -1; // The default port number is -1
private int offset = 0;
/**
* Constructs a new {@code DatagramPacket} object to receive data up to
* {@code length} bytes.
*
* @param data
* a byte array to store the read characters.
* @param length
* the length of the data buffer.
*/
public DatagramPacket(byte[] data, int length) {
this(data, 0, length);
}
/**
* Constructs a new {@code DatagramPacket} object to receive data up to
* {@code length} bytes with a specified buffer offset.
*
* @param data
* a byte array to store the read characters.
* @param offset
* the offset of the byte array where the bytes is written.
* @param length
* the length of the data.
*/
public DatagramPacket(byte[] data, int offset, int length) {
setData(data, offset, length);
}
/**
* Constructs a new {@code DatagramPacket} object to send data to the port
* {@code aPort} of the address {@code host}. The {@code length} must be
* lesser than or equal to the size of {@code data}. The first {@code
* length} bytes from the byte array position {@code offset} are sent.
*
* @param data
* a byte array which stores the characters to be sent.
* @param offset
* the offset of {@code data} where to read from.
* @param length
* the length of data.
* @param host
* the address of the target host.
* @param aPort
* the port of the target host.
*/
public DatagramPacket(byte[] data, int offset, int length, InetAddress host, int aPort) {
this(data, offset, length);
setPort(aPort);
address = host;
}
/**
* Constructs a new {@code DatagramPacket} object to send data to the port
* {@code aPort} of the address {@code host}. The {@code length} must be
* lesser than or equal to the size of {@code data}. The first {@code
* length} bytes are sent.
*
* @param data
* a byte array which stores the characters to be sent.
* @param length
* the length of data.
* @param host
* the address of the target host.
* @param port
* the port of the target host.
*/
public DatagramPacket(byte[] data, int length, InetAddress host, int port) {
this(data, 0, length, host, port);
}
/**
* Gets the sender or destination IP address of this datagram packet.
*
* @return the address from where the datagram was received or to which it
* is sent.
*/
public synchronized InetAddress getAddress() {
return address;
}
/**
* Gets the data of this datagram packet.
*
* @return the received data or the data to be sent.
*/
public synchronized byte[] getData() {
return data;
}
/**
* Gets the length of the data stored in this datagram packet.
*
* @return the length of the received data or the data to be sent.
*/
public synchronized int getLength() {
return length;
}
/**
* Gets the offset of the data stored in this datagram packet.
*
* @return the position of the received data or the data to be sent.
*/
public synchronized int getOffset() {
return offset;
}
/**
* Gets the port number of the target or sender host of this datagram
* packet.
*
* @return the port number of the origin or target host.
*/
public synchronized int getPort() {
return port;
}
/**
* Sets the IP address of the target host.
*
* @param addr
* the target host address.
*/
public synchronized void setAddress(InetAddress addr) {
address = addr;
}
/**
* Sets the data buffer for this datagram packet.
*/
public synchronized void setData(byte[] data, int offset, int byteCount) {
if ((offset | byteCount) < 0 || offset > data.length || byteCount > data.length - offset) {
throw new IllegalArgumentException();
}
this.data = data;
this.offset = offset;
this.length = byteCount;
this.userSuppliedLength = byteCount;
}
/**
* Sets the data buffer for this datagram packet. The length of the datagram
* packet is set to the buffer length.
*
* @param buf
* the buffer to store the data.
*/
public synchronized void setData(byte[] buf) {
length = buf.length; // This will check for null
userSuppliedLength = length;
data = buf;
offset = 0;
}
/**
* Sets the length of the datagram packet. This length plus the offset must
* be lesser than or equal to the buffer size.
*
* @param length
* the length of this datagram packet.
*/
public synchronized void setLength(int length) {
if (length < 0 || offset + length > data.length) {
throw new IndexOutOfBoundsException("length=" + length + ", offset=" + offset +
", buffer size=" + data.length);
}
this.length = length;
this.userSuppliedLength = length;
}
/**
* Resets 'length' to the last user-supplied length, ready to receive another packet.
* @hide for PlainDatagramSocketImpl
*/
public void resetLengthForReceive() {
this.length = userSuppliedLength;
}
/**
* Sets 'length' without changing 'userSuppliedLength', after receiving a packet.
* @hide for IoBridge
*/
public void setReceivedLength(int length) {
this.length = length;
}
/**
* Sets the port number of the target host of this datagram packet.
*
* @param aPort
* the target host port number.
*/
public synchronized void setPort(int aPort) {
if (aPort < 0 || aPort > 65535) {
throw new IllegalArgumentException("Port out of range: " + aPort);
}
port = aPort;
}
/**
* Constructs a new {@code DatagramPacket} object to send data to the
* address {@code sockAddr}. The {@code length} must be lesser than or equal
* to the size of {@code data}. The first {@code length} bytes of the data
* are sent.
*
* @param data
* the byte array to store the data.
* @param length
* the length of the data.
* @param sockAddr
* the target host address and port.
* @throws SocketException
* if an error in the underlying protocol occurs.
*/
public DatagramPacket(byte[] data, int length, SocketAddress sockAddr) throws SocketException {
this(data, 0, length);
setSocketAddress(sockAddr);
}
/**
* Constructs a new {@code DatagramPacket} object to send data to the
* address {@code sockAddr}. The {@code length} must be lesser than or equal
* to the size of {@code data}. The first {@code length} bytes of the data
* are sent.
*
* @param data
* the byte array to store the data.
* @param offset
* the offset of the data.
* @param length
* the length of the data.
* @param sockAddr
* the target host address and port.
* @throws SocketException
* if an error in the underlying protocol occurs.
*/
public DatagramPacket(byte[] data, int offset, int length,
SocketAddress sockAddr) throws SocketException {
this(data, offset, length);
setSocketAddress(sockAddr);
}
/**
* Gets the host address and the port to which this datagram packet is sent
* as a {@code SocketAddress} object.
*
* @return the SocketAddress of the target host.
*/
public synchronized SocketAddress getSocketAddress() {
return new InetSocketAddress(getAddress(), getPort());
}
/**
* Sets the {@code SocketAddress} for this datagram packet.
*
* @param sockAddr
* the SocketAddress of the target host.
*/
public synchronized void setSocketAddress(SocketAddress sockAddr) {
if (!(sockAddr instanceof InetSocketAddress)) {
throw new IllegalArgumentException("Socket address not an InetSocketAddress: " +
(sockAddr == null ? null : sockAddr.getClass()));
}
InetSocketAddress inetAddr = (InetSocketAddress) sockAddr;
if (inetAddr.isUnresolved()) {
throw new IllegalArgumentException("Socket address unresolved: " + sockAddr);
}
port = inetAddr.getPort();
address = inetAddr.getAddress();
}
}
