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// DatagramPacket.java - Represents packets in a connectionless protocol.
/* Copyright (C) 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.net;
/**
* @author Warren Levy <warrenl@cygnus.com>
* @date April 28, 1999.
*/
/**
* Written using on-line Java Platform 1.2 API Specification, as well
* as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
* Status: Believed complete and correct.
*/
public final class DatagramPacket
{
private byte[] buffer;
private int offset;
private int length;
private InetAddress address;
private int port;
// JDK1.2
public DatagramPacket(byte[] buf, int offset, int length)
{
// FIXME: We can't currently rely on NullPointerException being
// thrown when we invoke a method on a null object.
if (buf == null)
throw new NullPointerException("Null buffer");
if (offset < 0)
throw new IllegalArgumentException("Invalid offset: " + offset);
if (length < 0)
throw new IllegalArgumentException("Invalid length: " + length);
if (offset + length > buf.length)
throw new IllegalArgumentException("Potential buffer overflow - offset: "
+ offset + " length: " + length);
buffer = buf;
this.offset = offset;
this.length = length;
this.address = null;
this.port = -1;
}
public DatagramPacket(byte[] buf, int length)
{
this(buf, 0, length);
}
// JDK1.2
public DatagramPacket(byte[] buf, int offset, int length,
InetAddress address, int port)
{
// FIXME: We can't currently rely on NullPointerException being
// thrown when we invoke a method on a null object.
if (buf == null)
throw new NullPointerException("Null buffer");
if (offset < 0)
throw new IllegalArgumentException("Invalid offset: " + offset);
if (length < 0)
throw new IllegalArgumentException("Invalid length: " + length);
if (offset + length > buf.length)
throw new IllegalArgumentException("Potential buffer overflow - offset: "
+ offset + " length: " + length);
if (port < 0 || port > 65535)
throw new IllegalArgumentException("Invalid port: " + port);
if (address == null)
throw new NullPointerException("Null address");
buffer = buf;
this.offset = offset;
this.length = length;
this.address = address;
this.port = port;
}
public DatagramPacket(byte[] buf, int length, InetAddress address, int port)
{
this(buf, 0, length, address, port);
}
public synchronized InetAddress getAddress()
{
return address;
}
public synchronized int getPort()
{
return port;
}
public synchronized byte[] getData()
{
return buffer;
}
// JDK1.2
public synchronized int getOffset()
{
return offset;
}
public synchronized int getLength()
{
return length;
}
public synchronized void setAddress(InetAddress iaddr)
{
if (iaddr == null)
throw new NullPointerException("Null address");
address = iaddr;
}
public synchronized void setPort(int iport)
{
if (iport < 0 || iport > 65535)
throw new IllegalArgumentException("Invalid port: " + iport);
port = iport;
}
public synchronized void setData(byte[] buf)
{
// This form of setData requires setLength to be called separately
// and subsequently.
if (buf == null)
throw new NullPointerException("Null buffer");
buffer = buf;
}
// JDK1.2
public synchronized void setData(byte[] buf, int offset, int length)
{
// This form of setData must be used if offset is to be changed.
// FIXME: We can't currently rely on NullPointerException being
// thrown when we invoke a method on a null object.
if (buf == null)
throw new NullPointerException("Null buffer");
if (offset < 0)
throw new IllegalArgumentException("Invalid offset: " + offset);
if (length < 0)
throw new IllegalArgumentException("Invalid length: " + length);
if (offset + length > buf.length)
throw new IllegalArgumentException("Potential buffer overflow - offset: "
+ offset + " length: " + length);
buffer = buf;
this.offset = offset;
this.length = length;
}
public synchronized void setLength(int length)
{
if (length < 0)
throw new IllegalArgumentException("Invalid length: " + length);
if (offset + length > buffer.length)
throw new IllegalArgumentException("Potential buffer overflow - offset: "
+ offset + " length: " + length);
this.length = length;
}
}
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