org.apache.iotdb.tsfile.compress

Class ICompressor.GZIPCompressor

java.lang.Object

org.apache.iotdb.tsfile.compress.ICompressor.GZIPCompressor

All Implemented Interfaces:

Serializable, ICompressor

Enclosing interface:

ICompressor

public static class ICompressor.GZIPCompressor
extends Object
implements ICompressor

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.iotdb.tsfile.compress.ICompressor

ICompressor.GZIPCompress, ICompressor.GZIPCompressor, ICompressor.IOTDBLZ4Compressor, ICompressor.NoCompressor, ICompressor.SnappyCompressor

Constructor Summary

Constructors

Constructor and Description
GZIPCompressor()

Method Summary

Modifier and Type	Method and Description
byte[]	compress(byte[] data)
byte[]	compress(byte[] data, int offset, int length) abstract method of compress.
int	compress(byte[] data, int offset, int length, byte[] compressed) abstract method of compress.
int	compress(ByteBuffer data, ByteBuffer compressed) If the data is large, this function is better than byte[].
int	getMaxBytesForCompression(int uncompressedDataSize) Get the maximum byte size needed for compressing data of the given byte size.
CompressionType	getType()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iotdb.tsfile.compress.ICompressor

getCompressor, getCompressor

Constructor Detail

GZIPCompressor

public GZIPCompressor()

Method Detail

compress

public byte[] compress(byte[] data)
                throws IOException

Specified by:

compress in interface ICompressor

Throws:

IOException

compress

public byte[] compress(byte[] data,
                       int offset,
                       int length)
                throws IOException

Description copied from interface: ICompressor

abstract method of compress. this method has an important overhead due to the fact that it needs to allocate a byte array to compress into, and then needs to resize this buffer to the actual compressed length.

Specified by:

compress in interface ICompressor

Returns:

byte array of compressed data.

Throws:

IOException

compress

public int compress(byte[] data,
                    int offset,
                    int length,
                    byte[] compressed)
             throws IOException

Description copied from interface: ICompressor

abstract method of compress.

Specified by:

compress in interface ICompressor

Returns:

byte length of compressed data.

Throws:

GZIPCompressOverflowException - if compressed byte array is too small.

IOException

compress

public int compress(ByteBuffer data,
                    ByteBuffer compressed)
             throws IOException

Description copied from interface: ICompressor

If the data is large, this function is better than byte[].

Specified by:

compress in interface ICompressor

Parameters:

data - MUST be DirectByteBuffer for Snappy.

compressed - MUST be DirectByteBuffer for Snappy.

Returns:

byte length of compressed data.

Throws:

GZIPCompressOverflowException - if compressed ByteBuffer is too small.

IOException

getMaxBytesForCompression

public int getMaxBytesForCompression(int uncompressedDataSize)

Description copied from interface: ICompressor

Get the maximum byte size needed for compressing data of the given byte size. For GZIP, this method is insecure and may cause GZIPCompressOverflowException

Specified by:

getMaxBytesForCompression in interface ICompressor

Parameters:

uncompressedDataSize - byte size of the data to compress

Returns:

maximum byte size of the compressed data

getType

public CompressionType getType()

Specified by:

getType in interface ICompressor