org.apache.lucene.util

Class IndexableBinaryStringTools

java.lang.Object

org.apache.lucene.util.IndexableBinaryStringTools

Deprecated.

Implement TermToBytesRefAttribute and store bytes directly instead. This class will be removed in Lucene 5.0

@Deprecated
public final class IndexableBinaryStringTools
extends Object

Provides support for converting byte sequences to Strings and back again. The resulting Strings preserve the original byte sequences' sort order.

The Strings are constructed using a Base 8000h encoding of the original binary data - each char of an encoded String represents a 15-bit chunk from the byte sequence. Base 8000h was chosen because it allows for all lower 15 bits of char to be used without restriction; the surrogate range [U+D8000-U+DFFF] does not represent valid chars, and would require complicated handling to avoid them and allow use of char's high bit.

Although unset bits are used as padding in the final char, the original byte sequence could contain trailing bytes with no set bits (null bytes): padding is indistinguishable from valid information. To overcome this problem, a char is appended, indicating the number of encoded bytes in the final content char.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Method Summary

Methods

Modifier and Type	Method and Description
static void	decode(char[] inputArray, int inputOffset, int inputLength, byte[] outputArray, int outputOffset, int outputLength) Deprecated. Decodes the input char sequence into the output byte sequence.
static void	encode(byte[] inputArray, int inputOffset, int inputLength, char[] outputArray, int outputOffset, int outputLength) Deprecated. Encodes the input byte sequence into the output char sequence.
static int	getDecodedLength(char[] encoded, int offset, int length) Deprecated. Returns the number of bytes required to decode the given char sequence.
static int	getEncodedLength(byte[] inputArray, int inputOffset, int inputLength) Deprecated. Returns the number of chars required to encode the given bytes.

Methods inherited from class java.lang.Object

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

Method Detail

getEncodedLength

public static int getEncodedLength(byte[] inputArray,
                   int inputOffset,
                   int inputLength)

Deprecated.

Returns the number of chars required to encode the given bytes.

Parameters:

inputArray - byte sequence to be encoded

inputOffset - initial offset into inputArray

inputLength - number of bytes in inputArray

Returns:

The number of chars required to encode the number of bytes.

getDecodedLength

public static int getDecodedLength(char[] encoded,
                   int offset,
                   int length)

Deprecated.

Returns the number of bytes required to decode the given char sequence.

Parameters:

encoded - char sequence to be decoded

offset - initial offset

length - number of characters

Returns:

The number of bytes required to decode the given char sequence

encode

public static void encode(byte[] inputArray,
          int inputOffset,
          int inputLength,
          char[] outputArray,
          int outputOffset,
          int outputLength)

Deprecated.

Encodes the input byte sequence into the output char sequence. Before calling this method, ensure that the output array has sufficient capacity by calling getEncodedLength(byte[], int, int).

Parameters:

inputArray - byte sequence to be encoded

inputOffset - initial offset into inputArray

inputLength - number of bytes in inputArray

outputArray - char sequence to store encoded result

outputOffset - initial offset into outputArray

outputLength - length of output, must be getEncodedLength

decode

public static void decode(char[] inputArray,
          int inputOffset,
          int inputLength,
          byte[] outputArray,
          int outputOffset,
          int outputLength)

Deprecated.

Decodes the input char sequence into the output byte sequence. Before calling this method, ensure that the output array has sufficient capacity by calling getDecodedLength(char[], int, int).

Parameters:

inputArray - char sequence to be decoded

inputOffset - initial offset into inputArray

inputLength - number of chars in inputArray

outputArray - byte sequence to store encoded result

outputOffset - initial offset into outputArray

outputLength - length of output, must be getDecodedLength(inputArray, inputOffset, inputLength)