org.iq80.snappy

Class SnappyFramedOutputStream

java.lang.Object

java.io.OutputStream

org.iq80.snappy.AbstractSnappyOutputStream

org.iq80.snappy.SnappyFramedOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

public final class SnappyFramedOutputStream
extends AbstractSnappyOutputStream

Implements the x-snappy-framed as an OutputStream.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_BLOCK_SIZE
static double	DEFAULT_MIN_COMPRESSION_RATIO
static int	MAX_BLOCK_SIZE We place an additional restriction that the uncompressed data in a chunk must be no longer than 65536 bytes.

Constructor Summary

Constructors

Constructor and Description
SnappyFramedOutputStream(java.io.OutputStream out)
SnappyFramedOutputStream(java.io.OutputStream out, int blockSize, double minCompressionRatio)

Method Summary

Modifier and Type	Method and Description
protected void	writeBlock(java.io.OutputStream out, byte[] data, int offset, int length, boolean compressed, int crc32c) Each chunk consists first a single byte of chunk identifier, then a three-byte little-endian length of the chunk in bytes (from 0 to 16777215, inclusive), and then the data if any.
protected void	writeHeader(java.io.OutputStream out) Writes the implementation specific header or "marker bytes" to out.

Methods inherited from class org.iq80.snappy.AbstractSnappyOutputStream

calculateCRC32C, close, flush, write, write

Methods inherited from class java.io.OutputStream

write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_BLOCK_SIZE

public static final int MAX_BLOCK_SIZE

We place an additional restriction that the uncompressed data in a chunk must be no longer than 65536 bytes. This allows consumers to easily use small fixed-size buffers.

See Also:

Constant Field Values

DEFAULT_BLOCK_SIZE

public static final int DEFAULT_BLOCK_SIZE

See Also:

Constant Field Values

DEFAULT_MIN_COMPRESSION_RATIO

public static final double DEFAULT_MIN_COMPRESSION_RATIO

See Also:

Constant Field Values

Constructor Detail

SnappyFramedOutputStream

public SnappyFramedOutputStream(java.io.OutputStream out)
                         throws java.io.IOException

Throws:

java.io.IOException

SnappyFramedOutputStream

public SnappyFramedOutputStream(java.io.OutputStream out,
                                int blockSize,
                                double minCompressionRatio)
                         throws java.io.IOException

Throws:

java.io.IOException

Method Detail

writeHeader

protected void writeHeader(java.io.OutputStream out)
                    throws java.io.IOException

Description copied from class: AbstractSnappyOutputStream

Writes the implementation specific header or "marker bytes" to out.

Specified by:

writeHeader in class AbstractSnappyOutputStream

Parameters:

out - The underlying OutputStream.

Throws:

java.io.IOException

writeBlock

protected void writeBlock(java.io.OutputStream out,
                          byte[] data,
                          int offset,
                          int length,
                          boolean compressed,
                          int crc32c)
                   throws java.io.IOException

Each chunk consists first a single byte of chunk identifier, then a three-byte little-endian length of the chunk in bytes (from 0 to 16777215, inclusive), and then the data if any. The four bytes of chunk header is not counted in the data length.

Specified by:

writeBlock in class AbstractSnappyOutputStream

Parameters:

out - The OutputStream to write to.

data - The data to write.

offset - The offset in data to start at.

length - The length of data to use.

compressed - Indicates if data is the compressed or raw content. This is based on whether the compression ratio desired is reached.

crc32c - The calculated checksum.

Throws:

java.io.IOException