org.apache.lucene.document
Class CompressionTools

java.lang.Object
  org.apache.lucene.document.CompressionTools

public class CompressionTools
extends Object

Simple utility class providing static methods to compress and decompress binary data for stored fields. This class uses java.util.zip.Deflater and Inflater classes to compress and decompress.

Method Summary

static byte[]	compress(byte[] value) Compresses all bytes in the array, with default BEST_COMPRESSION level
static byte[]	compress(byte[] value, int offset, int length) Compresses the specified byte range, with default BEST_COMPRESSION level
static byte[]	compress(byte[] value, int offset, int length, int compressionLevel) Compresses the specified byte range using the specified compressionLevel (constants are defined in java.util.zip.Deflater).
static byte[]	compressString(String value) Compresses the String value, with default BEST_COMPRESSION level
static byte[]	compressString(String value, int compressionLevel) Compresses the String value using the specified compressionLevel (constants are defined in java.util.zip.Deflater).
static byte[]	decompress(byte[] value) Decompress the byte array previously returned by compress
static String	decompressString(byte[] value) Decompress the byte array previously returned by compressString back into a String

Methods inherited from class java.lang.Object

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

Method Detail

compress

public static byte[] compress(byte[] value,
                              int offset,
                              int length,
                              int compressionLevel)

Compresses the specified byte range using the specified compressionLevel (constants are defined in java.util.zip.Deflater).

compress

public static byte[] compress(byte[] value,
                              int offset,
                              int length)

Compresses the specified byte range, with default BEST_COMPRESSION level

compress

public static byte[] compress(byte[] value)

Compresses all bytes in the array, with default BEST_COMPRESSION level

compressString

public static byte[] compressString(String value)

Compresses the String value, with default BEST_COMPRESSION level

compressString

public static byte[] compressString(String value,
                                    int compressionLevel)

Compresses the String value using the specified compressionLevel (constants are defined in java.util.zip.Deflater).

decompress

public static byte[] decompress(byte[] value)
                         throws DataFormatException

Decompress the byte array previously returned by compress

Throws:

DataFormatException

decompressString

public static String decompressString(byte[] value)
                               throws DataFormatException

Decompress the byte array previously returned by compressString back into a String

Throws:

DataFormatException