Class CompressOutputStream
- java.lang.Object
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- java.io.OutputStream
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- org.mariadb.jdbc.client.socket.impl.CompressOutputStream
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- All Implemented Interfaces:
java.io.Closeable
,java.io.Flushable
,java.lang.AutoCloseable
public class CompressOutputStream extends java.io.OutputStream
Compression writer handler Permit to wrap standard packet to compressed packet ( 7 byte header). Driver will compress packet only if packet size is meaningful (1536 bytes) > to one TCP packet.
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Field Summary
Fields Modifier and Type Field Description private byte[]
header
private byte[]
longPacketBuffer
private static int
MIN_COMPRESSION_SIZE
private java.io.OutputStream
out
private MutableByte
sequence
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Constructor Summary
Constructors Constructor Description CompressOutputStream(java.io.OutputStream out, MutableByte compressionSequence)
Constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
close()
Closes this output stream and releases any system resources associated with this stream.void
flush()
Flushes this output stream and forces any buffered output bytes to be written out.void
write(byte[] b, int off, int len)
Writeslen
bytes from the specified byte array starting at offsetoff
to this output stream.void
write(int b)
Writes the specified byte to this output stream.
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Field Detail
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MIN_COMPRESSION_SIZE
private static final int MIN_COMPRESSION_SIZE
- See Also:
- Constant Field Values
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out
private final java.io.OutputStream out
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sequence
private final MutableByte sequence
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header
private final byte[] header
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longPacketBuffer
private byte[] longPacketBuffer
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Constructor Detail
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CompressOutputStream
public CompressOutputStream(java.io.OutputStream out, MutableByte compressionSequence)
Constructor.- Parameters:
out
- socket output streamcompressionSequence
- compression sequence
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Method Detail
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write
public void write(byte[] b, int off, int len) throws java.io.IOException
Writeslen
bytes from the specified byte array starting at offsetoff
to this output stream. The general contract forwrite(b, off, len)
is that some bytes in the arrayb
are written to the output stream in order; elementb[off]
is the first byte written andb[off+len-1]
is the last byte written by this operation.The
write
method ofOutputStream
calls the write method of one argument on each of the bytes to be written out. Subclasses are encouraged to override this method and provide a more efficient implementation.If
b
isnull
, aNullPointerException
is thrown.If
off
is negative, orlen
is negative, oroff+len
is greater than the length of the arrayb
, then an IndexOutOfBoundsException is thrown.- Overrides:
write
in classjava.io.OutputStream
- Parameters:
b
- the data.off
- the start offset in the data.len
- the number of bytes to write.- Throws:
java.io.IOException
- if an I/O error occurs. In particular, anIOException
is thrown if the output stream is closed.
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flush
public void flush() throws java.io.IOException
Flushes this output stream and forces any buffered output bytes to be written out. The general contract offlush
is that calling it is an indication that, if any bytes previously written have been buffered by the implementation of the output stream, such bytes should immediately be written to their intended destination.If the intended destination of this stream is an abstraction provided by the underlying operating system, for example a file, then flushing the stream guarantees only that bytes previously written to the stream are passed to the operating system for writing; it does not guarantee that they are actually written to a physical device such as a disk drive.
The
flush
method ofOutputStream
does nothing.- Specified by:
flush
in interfacejava.io.Flushable
- Overrides:
flush
in classjava.io.OutputStream
- Throws:
java.io.IOException
- if an I/O error occurs.
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close
public void close() throws java.io.IOException
Closes this output stream and releases any system resources associated with this stream. The general contract ofclose
is that it closes the output stream. A closed stream cannot perform output operations and cannot be reopened.The
close
method ofOutputStream
does nothing.- Specified by:
close
in interfacejava.lang.AutoCloseable
- Specified by:
close
in interfacejava.io.Closeable
- Overrides:
close
in classjava.io.OutputStream
- Throws:
java.io.IOException
- if an I/O error occurs.
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write
public void write(int b) throws java.io.IOException
Writes the specified byte to this output stream. The general contract forwrite
is that one byte is written to the output stream. The byte to be written is the eight low-order bits of the argumentb
. The 24 high-order bits ofb
are ignored.Subclasses of
OutputStream
must provide an implementation for this method.- Specified by:
write
in classjava.io.OutputStream
- Parameters:
b
- thebyte
.- Throws:
java.io.IOException
- if an I/O error occurs. In particular, anIOException
may be thrown if the output stream has been closed.
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