org.apache.lucene.document

Class CompressionTools

java.lang.Object

org.apache.lucene.document.CompressionTools

public class CompressionTools
extends java.lang.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

Modifier and Type	Method and Description
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(java.lang.String value) Compresses the String value, with default BEST_COMPRESSION level
static byte[]	compressString(java.lang.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 byte[]	decompress(byte[] value, int offset, int length) Decompress the byte array previously returned by compress
static byte[]	decompress(BytesRef bytes) Decompress the byte array previously returned by compress (referenced by the provided BytesRef)
static java.lang.String	decompressString(byte[] value) Decompress the byte array previously returned by compressString back into a String
static java.lang.String	decompressString(byte[] value, int offset, int length) Decompress the byte array previously returned by compressString back into a String
static java.lang.String	decompressString(BytesRef bytes) Decompress the byte array (referenced by the provided BytesRef) previously returned by compressString back into a String

Methods inherited from class java.lang.Object

equals, 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(java.lang.String value)

Compresses the String value, with default BEST_COMPRESSION level

compressString

public static byte[] compressString(java.lang.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(BytesRef bytes)
                         throws java.util.zip.DataFormatException

Decompress the byte array previously returned by compress (referenced by the provided BytesRef)

Throws:

java.util.zip.DataFormatException

decompress

public static byte[] decompress(byte[] value)
                         throws java.util.zip.DataFormatException

Decompress the byte array previously returned by compress

Throws:

java.util.zip.DataFormatException

decompress

public static byte[] decompress(byte[] value,
                                int offset,
                                int length)
                         throws java.util.zip.DataFormatException

Decompress the byte array previously returned by compress

Throws:

java.util.zip.DataFormatException

decompressString

public static java.lang.String decompressString(byte[] value)
                                         throws java.util.zip.DataFormatException

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

Throws:

java.util.zip.DataFormatException

decompressString

public static java.lang.String decompressString(byte[] value,
                                                int offset,
                                                int length)
                                         throws java.util.zip.DataFormatException

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

Throws:

java.util.zip.DataFormatException

decompressString

public static java.lang.String decompressString(BytesRef bytes)
                                         throws java.util.zip.DataFormatException

Decompress the byte array (referenced by the provided BytesRef) previously returned by compressString back into a String

Throws:

java.util.zip.DataFormatException