Class IndexableBinaryStringTools

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

The s are constructed using a Base 8000h encoding of the original binary data - each char of an encoded 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.

@lucene.experimental

Inheritance

System.Object

IndexableBinaryStringTools

Namespace: Lucene.Net.Util

Assembly: Lucene.Net.dll

Syntax

public sealed class IndexableBinaryStringTools : object

Methods

Decode(Char[], Int32, Int32, Byte[], Int32, Int32)

Decodes the input sequence into the output sequence. Before calling this method, ensure that the output array has sufficient capacity by calling GetDecodedLength(Char[], Int32, Int32).

Declaration

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

Parameters

Type	Name	Description
System.Char[]	inputArray	sequence to be decoded
System.Int32	inputOffset	Initial offset into inputArray
System.Int32	inputLength	Number of chars in inputArray
System.Byte[]	outputArray	sequence to store encoded result
System.Int32	outputOffset	Initial offset into outputArray
System.Int32	outputLength	Length of output, must be GetDecodedLength(inputArray, inputOffset, inputLength)

Decode(Char[], Int32, Int32, SByte[], Int32, Int32)

Decodes the input char sequence into the output sbyte sequence. Before calling this method, ensure that the output array has sufficient capacity by calling GetDecodedLength(Char[], Int32, Int32).

Declaration

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

Parameters

Type	Name	Description
System.Char[]	inputArray	sequence to be decoded
System.Int32	inputOffset	Initial offset into inputArray
System.Int32	inputLength	Number of chars in inputArray
System.SByte[]	outputArray	sequence to store encoded result
System.Int32	outputOffset	Initial offset into outputArray
System.Int32	outputLength	Length of output, must be GetDecodedLength(inputArray, inputOffset, inputLength)

Encode(Byte[], Int32, Int32, Char[], Int32, Int32)

Encodes the input sequence into the output char sequence. Before calling this method, ensure that the output array has sufficient capacity by calling GetEncodedLength(Byte[], Int32, Int32).

Declaration

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

Parameters

Type	Name	Description
System.Byte[]	inputArray	sequence to be encoded
System.Int32	inputOffset	Initial offset into inputArray
System.Int32	inputLength	Number of bytes in inputArray
System.Char[]	outputArray	sequence to store encoded result
System.Int32	outputOffset	Initial offset into outputArray
System.Int32	outputLength	Length of output, must be GetEncodedLength(inputArray, inputOffset, inputLength)

Encode(SByte[], Int32, Int32, Char[], Int32, Int32)

Encodes the input sequence into the output char sequence. Before calling this method, ensure that the output array has sufficient capacity by calling GetEncodedLength(SByte[], Int32, Int32).

Declaration

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

Parameters

Type	Name	Description
System.SByte[]	inputArray	sequence to be encoded
System.Int32	inputOffset	Initial offset into inputArray
System.Int32	inputLength	Number of bytes in inputArray
System.Char[]	outputArray	sequence to store encoded result
System.Int32	outputOffset	Initial offset into outputArray
System.Int32	outputLength	Length of output, must be getEncodedLength

GetDecodedLength(Char[], Int32, Int32)

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

Declaration

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

Parameters

Type	Name	Description
System.Char[]	encoded	Char sequence to be decoded
System.Int32	offset	Initial offset
System.Int32	length	Number of characters

Returns

Type	Description
System.Int32	The number of s required to decode the given char sequence

GetEncodedLength(Byte[], Int32, Int32)

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

Declaration

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

Parameters

Type	Name	Description
System.Byte[]	inputArray	Byte sequence to be encoded
System.Int32	inputOffset	Initial offset into inputArray
System.Int32	inputLength	Number of bytes in inputArray

Returns

Type	Description
System.Int32	The number of chars required to encode the number of s.

GetEncodedLength(SByte[], Int32, Int32)

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

Declaration

public static int GetEncodedLength(sbyte[] inputArray, int inputOffset, int inputLength)

Parameters

Type	Name	Description
System.SByte[]	inputArray	sequence to be encoded
System.Int32	inputOffset	Initial offset into inputArray
System.Int32	inputLength	Number of sbytes in inputArray

Returns

Type	Description
System.Int32	The number of chars required to encode the number of s.