IndexableBinaryStringTools: convert arbitrary byte sequences into Strings that
can be used as index terms, and vice versa
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Key: LUCENE-1434
URL: https://issues.apache.org/jira/browse/LUCENE-1434
Project: Lucene - Java
Issue Type: New Feature
Components: Other
Affects Versions: 2.4
Reporter: Steven Rowe
Priority: Minor
Fix For: 2.9
Provides support for converting byte sequences to Strings that can be used as
index terms, and back again. The resulting Strings preserve the original byte
sequences' sort order (assuming the bytes are interpreted as unsigned).
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+D800-U+DFFF] does
not represent valid chars, and would require complicated handling to avoid them
and allow use of char's high bit.
This class is intended to serve as a mechanism to allow CollationKeys to serve
as index terms.
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