Package org.acplt.oncrpc
Class XdrBufferEncodingStream
- java.lang.Object
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- org.acplt.oncrpc.XdrEncodingStream
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- org.acplt.oncrpc.XdrBufferEncodingStream
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public class XdrBufferEncodingStream extends XdrEncodingStream
TheXdrBufferEncodingStreamclass provides a buffer-based XDR stream.- Version:
- $Revision: 1.2 $ $Date: 2003/08/14 11:26:50 $ $State: Exp $ $Locker: $
- Author:
- Harald Albrecht
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Field Summary
Fields Modifier and Type Field Description private byte[]bufferThe buffer which will receive the encoded information, before it is sent via a datagram socket.private intbufferHighmarkIndex of the last four byte word in the buffer.private intbufferIndexThe write pointer is an index into thebuffer.private static byte[]paddingZerosSome zeros, only needed for padding -- like in real life.
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Constructor Summary
Constructors Constructor Description XdrBufferEncodingStream(byte[] buffer)Constructs a newXdrBufferEncodingStreamwith a given buffer.XdrBufferEncodingStream(int bufferSize)Constructs a newXdrBufferEncodingStreamwith a buffer to encode data into of the given size.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidbeginEncoding(java.net.InetAddress receiverAddress, int receiverPort)Begins encoding a new XDR record.voidclose()Closes this encoding XDR stream and releases any system resources associated with this stream.voidendEncoding()Flushes this encoding XDR stream and forces any buffered output bytes to be written out.byte[]getXdrData()Returns the buffer holding encoded data.intgetXdrLength()Returns the amount of encoded data in the buffer.voidxdrEncodeInt(int value)Encodes (aka "serializes") a "XDR int" value and writes it down a XDR stream.voidxdrEncodeOpaque(byte[] value, int offset, int length)Encodes (aka "serializes") a XDR opaque value, which is represented by a vector of byte values, and starts atoffsetwith a length oflength.-
Methods inherited from class org.acplt.oncrpc.XdrEncodingStream
getCharacterEncoding, setCharacterEncoding, xdrEncodeBoolean, xdrEncodeBooleanFixedVector, xdrEncodeBooleanVector, xdrEncodeByte, xdrEncodeByteFixedVector, xdrEncodeByteVector, xdrEncodeDouble, xdrEncodeDoubleFixedVector, xdrEncodeDoubleVector, xdrEncodeDynamicOpaque, xdrEncodeFloat, xdrEncodeFloatFixedVector, xdrEncodeFloatVector, xdrEncodeIntFixedVector, xdrEncodeIntVector, xdrEncodeLong, xdrEncodeLongFixedVector, xdrEncodeLongVector, xdrEncodeOpaque, xdrEncodeOpaque, xdrEncodeShort, xdrEncodeShortFixedVector, xdrEncodeShortVector, xdrEncodeString, xdrEncodeStringFixedVector, xdrEncodeStringVector
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Field Detail
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buffer
private byte[] buffer
The buffer which will receive the encoded information, before it is sent via a datagram socket.
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bufferIndex
private int bufferIndex
The write pointer is an index into thebuffer.
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bufferHighmark
private int bufferHighmark
Index of the last four byte word in the buffer.
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paddingZeros
private static final byte[] paddingZeros
Some zeros, only needed for padding -- like in real life.
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Constructor Detail
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XdrBufferEncodingStream
public XdrBufferEncodingStream(int bufferSize)
Constructs a newXdrBufferEncodingStreamwith a buffer to encode data into of the given size.- Parameters:
bufferSize- Size of buffer to store encoded data in.
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XdrBufferEncodingStream
public XdrBufferEncodingStream(byte[] buffer)
Constructs a newXdrBufferEncodingStreamwith a given buffer.- Parameters:
buffer- Buffer to store encoded information in.- Throws:
java.lang.IllegalArgumentException- ifencodedLengthis not a multiple of four.
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Method Detail
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getXdrLength
public int getXdrLength()
Returns the amount of encoded data in the buffer.- Returns:
- length of data encoded in buffer.
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getXdrData
public byte[] getXdrData()
Returns the buffer holding encoded data.- Returns:
- Buffer with encoded data.
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beginEncoding
public void beginEncoding(java.net.InetAddress receiverAddress, int receiverPort) throws OncRpcException, java.io.IOExceptionBegins encoding a new XDR record. This involves resetting this encoding XDR stream back into a known state.- Overrides:
beginEncodingin classXdrEncodingStream- Parameters:
receiverAddress- Indicates the receiver of the XDR data. This can benullfor XDR streams connected permanently to a receiver (like in case of TCP/IP based XDR streams).receiverPort- Port number of the receiver.- Throws:
OncRpcException- if an ONC/RPC error occurs.java.io.IOException- if an I/O error occurs.
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endEncoding
public void endEncoding() throws OncRpcException, java.io.IOExceptionFlushes this encoding XDR stream and forces any buffered output bytes to be written out. The general contract ofendEncodingis that calling it is an indication that the current record is finished and any bytes previously encoded should immediately be written to their intended destination.- Overrides:
endEncodingin classXdrEncodingStream- Throws:
OncRpcException- if an ONC/RPC error occurs.java.io.IOException- if an I/O error occurs.
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close
public void close() throws OncRpcException, java.io.IOExceptionCloses this encoding XDR stream and releases any system resources associated with this stream. The general contract ofcloseis that it closes the encoding XDR stream. A closed XDR stream cannot perform encoding operations and cannot be reopened.- Overrides:
closein classXdrEncodingStream- Throws:
OncRpcException- if an ONC/RPC error occurs.java.io.IOException- if an I/O error occurs.
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xdrEncodeInt
public void xdrEncodeInt(int value) throws OncRpcException, java.io.IOExceptionEncodes (aka "serializes") a "XDR int" value and writes it down a XDR stream. A XDR int is 32 bits wide -- the same width Java's "int" data type has. This method is one of the basic methods all other methods can rely on.- Specified by:
xdrEncodeIntin classXdrEncodingStream- Parameters:
value- The int value to be encoded.- Throws:
OncRpcException- if an ONC/RPC error occurs.java.io.IOException- if an I/O error occurs.
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xdrEncodeOpaque
public void xdrEncodeOpaque(byte[] value, int offset, int length) throws OncRpcException, java.io.IOExceptionEncodes (aka "serializes") a XDR opaque value, which is represented by a vector of byte values, and starts atoffsetwith a length oflength. Only the opaque value is encoded, but no length indication is preceeding the opaque value, so the receiver has to know how long the opaque value will be. The encoded data is always padded to be a multiple of four. If the given length is not a multiple of four, zero bytes will be used for padding.- Specified by:
xdrEncodeOpaquein classXdrEncodingStream- Parameters:
value- The opaque value to be encoded in the form of a series of bytes.offset- Start offset in the data.length- the number of bytes to encode.- Throws:
OncRpcException- if an ONC/RPC error occurs.java.io.IOException- if an I/O error occurs.
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