Package org.h2.compress

Class CompressDeflate

  • All Implemented Interfaces:
    Compressor
    public class CompressDeflate
extends java.lang.Object
implements Compressor
    This is a wrapper class for the Deflater class. This algorithm supports the following options:
    • l or level: -1 (default), 0 (no compression), 1 (best speed), ..., 9 (best compression)
    • s or strategy: 0 (default), 1 (filtered), 2 (huffman only)
    See also java.util.zip.Deflater for details.

    • Constructor Summary

      Constructors 
      Constructor Description
      CompressDeflate()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int compress​(byte[] in, int inPos, int inLen, byte[] out, int outPos)
      Compress a number of bytes.
      void expand​(byte[] in, int inPos, int inLen, byte[] out, int outPos, int outLen)
      Expand a number of compressed bytes.
      int getAlgorithm()
      Get the compression algorithm type.
      void setOptions​(java.lang.String options)
      Set the compression options.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • level

        private int level

      • strategy

        private int strategy

    • Constructor Detail

      • CompressDeflate

        public CompressDeflate()

    • Method Detail

      • setOptions

        public void setOptions​(java.lang.String options)
        Description copied from interface: Compressor
        Set the compression options. This may include settings for higher performance but less compression.
        Specified by:
        setOptions in interface Compressor
        Parameters:
        options - the options

      • compress

        public int compress​(byte[] in,
                    int inPos,
                    int inLen,
                    byte[] out,
                    int outPos)
        Description copied from interface: Compressor
        Compress a number of bytes.
        Specified by:
        compress in interface Compressor
        Parameters:
        in - the input data
        inPos - the offset at the input array
        inLen - the number of bytes to compress
        out - the output area
        outPos - the offset at the output array
        Returns:
        the end position

      • getAlgorithm

        public int getAlgorithm()
        Description copied from interface: Compressor
        Get the compression algorithm type.
        Specified by:
        getAlgorithm in interface Compressor
        Returns:
        the type

      • expand

        public void expand​(byte[] in,
                   int inPos,
                   int inLen,
                   byte[] out,
                   int outPos,
                   int outLen)
        Description copied from interface: Compressor
        Expand a number of compressed bytes.
        Specified by:
        expand in interface Compressor
        Parameters:
        in - the compressed data
        inPos - the offset at the input array
        inLen - the number of bytes to read
        out - the output area
        outPos - the offset at the output array
        outLen - the size of the uncompressed data