mirror of https://github.com/apache/lucene.git
697 lines
27 KiB
Plaintext
697 lines
27 KiB
Plaintext
Lucene Change Log
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$Id$
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1.9 RC1
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1. The API contained methods that declared to throw an IOException
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but that never did this. These declarations have been removed. If
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your code tries to catch these exceptions you might need to remove
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those catch clauses to avoid compile errors. (Daniel Naber)
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2. FuzzyQuery now takes an additional parameter that specifies the
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minimum similarity that is required for a term to match the query.
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The QueryParser syntax for this is term~x, where x is a floating
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point number between 0 and 1 (a bigger number means that a higher
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similarity is required). Furthermore, a prefix can be specified
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for FuzzyQuerys so that only those terms are considered similar that
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start with this prefix. This can speed up FuzzyQuery greatly.
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(Daniel Naber, Christoph Goller)
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3. The Russian and the German analyzers have been moved to Sandbox.
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Also, the WordlistLoader class has been moved one level up in the
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hierarchy and is now org.apache.lucene.analysis.WordlistLoader
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(Daniel Naber)
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4. Fixed a bug in IndexWriter.addIndexes(IndexReader[] readers) that
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prevented deletion of obsolete segments. (Christoph Goller)
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5. Disk usage (peak requirements during indexing and optimization)
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in case of compound file format has been improved.
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(Bernhard, Dmitry, and Christoph)
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6. Added javadocs-internal to build.xml - bug #30360
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(Paul Elschot via Otis)
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7. Several methods and fields have been deprecated. The API documentation
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contains information about the recommended replacements. It is planned
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that the deprecated methods and fields will be removed in Lucene 2.0.
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(Daniel Naber)
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8. A new class DateTools has been added. It allows you to format dates
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in a readable format adequate for indexing. Unlike the existing
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DateField class DateTools can cope with dates before 1970 and it
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forces you to specify the desired date resolution (e.g. month, day,
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second, ...) which can make RangeQuerys on those fields more efficient.
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(Daniel Naber)
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9. PhraseQuery and PhrasePrefixQuery now allow the explicit specification
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of relative positions. (Christoph Goller)
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10. QueryParser changes: Fix for ArrayIndexOutOfBoundsExceptions
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(patch #9110); some unused method parameters removed; The ability
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to specify a minimum similarity for FuzzyQuery has been added.
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(Christoph Goller)
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11. Added support for binary stored fields (patch #29370)
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(Drew Farris and Bernhard Messer via Christoph)
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12. Permit unbuffered Directory implementations (e.g., using mmap).
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InputStream is replaced by the new classes IndexInput and
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BufferedIndexInput. OutputStream is replaced by the new classes
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IndexOutput and BufferedIndexOutput. InputStream and OutputStream
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are now deprecated and FSDirectory is now subclassable. (cutting)
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13. Fixed bug #31241: Sorting could lead to incorrect results (documents
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missing, others duplicated) if the sort keys were not unique and there
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were more than 100 matches. (Daniel Naber)
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14. Add native Directory and TermDocs implementations that work under
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GCJ. These require GCC 3.4.0 or later and have only been tested
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on Linux. Use 'ant gcj' to build demo applications. (cutting)
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15. Add MMapDirectory, which uses nio to mmap input files. This is
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still somewhat slower than FSDirectory. However it uses less
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memory per query term, since a new buffer is not allocated per
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term, which may help applications which use, e.g., wildcard
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queries. It also should, in theory, someday be faster. A
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downside is, due to limitations of the nio APIs, this does not
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work with indexes containing files larger than 2^31 bytes. (cutting)
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16. Optimize the performance of certain uses of BooleanScorer,
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TermScorer and IndexSearcher. In particular, a BooleanQuery
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composed of TermQuery, with not all terms required, that returns a
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TopDocs (e.g., through a Hits with no Sort specified) runs much
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faster. (cutting)
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1.4.1
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1. Fixed a performance bug in hit sorting code, where values were not
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correctly cached. (Aviran via cutting)
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2. Fixed errors in file format documentation. (Daniel Naber)
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1.4 final
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1. Added "an" to the list of stop words in StopAnalyzer, to complement
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the existing "a" there. Fix for bug 28960
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(http://issues.apache.org/bugzilla/show_bug.cgi?id=28960). (Otis)
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2. Added new class FieldCache to manage in-memory caches of field term
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values. (Tim Jones)
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3. Added overloaded getFieldQuery method to QueryParser which
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accepts the slop factor specified for the phrase (or the default
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phrase slop for the QueryParser instance). This allows overriding
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methods to replace a PhraseQuery with a SpanNearQuery instead,
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keeping the proper slop factor. (Erik Hatcher)
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4. Changed the encoding of GermanAnalyzer.java and GermanStemmer.java to
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UTF-8 and changed the build encoding to UTF-8, to make changed files
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compile. (Otis Gospodnetic)
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5. Removed synchronization from term lookup under IndexReader methods
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termFreq(), termDocs() or termPositions() to improve
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multi-threaded performance. (cutting)
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6. Fix a bug where obsolete segment files were not deleted on Win32.
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1.4 RC3
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1. Fixed several search bugs introduced by the skipTo() changes in
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release 1.4RC1. The index file format was changed a bit, so
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collections must be re-indexed to take advantage of the skipTo()
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optimizations. (Christoph Goller)
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2. Added new Document methods, removeField() and removeFields().
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(Christoph Goller)
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3. Fixed inconsistencies with index closing. Indexes and directories
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are now only closed automatically by Lucene when Lucene opened
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them automatically. (Christoph Goller)
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4. Added new class: FilteredQuery. (Tim Jones)
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5. Added a new SortField type for custom comparators. (Tim Jones)
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6. Lock obtain timed out message now displays the full path to the lock
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file. (Daniel Naber via Erik)
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7. Fixed a bug in SpanNearQuery when ordered. (Paul Elschot via cutting)
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8. Fixed so that FSDirectory's locks still work when the
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java.io.tmpdir system property is null. (cutting)
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9. Changed FilteredTermEnum's constructor to take no parameters,
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as the parameters were ignored anyway (bug #28858)
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1.4 RC2
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1. GermanAnalyzer now throws an exception if the stopword file
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cannot be found (bug #27987). It now uses LowerCaseFilter
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(bug #18410) (Daniel Naber via Otis, Erik)
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2. Fixed a few bugs in the file format documentation. (cutting)
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1.4 RC1
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1. Changed the format of the .tis file, so that:
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- it has a format version number, which makes it easier to
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back-compatibly change file formats in the future.
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- the term count is now stored as a long. This was the one aspect
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of the Lucene's file formats which limited index size.
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- a few internal index parameters are now stored in the index, so
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that they can (in theory) now be changed from index to index,
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although there is not yet an API to do so.
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These changes are back compatible. The new code can read old
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indexes. But old code will not be able read new indexes. (cutting)
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2. Added an optimized implementation of TermDocs.skipTo(). A skip
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table is now stored for each term in the .frq file. This only
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adds a percent or two to overall index size, but can substantially
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speedup many searches. (cutting)
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3. Restructured the Scorer API and all Scorer implementations to take
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advantage of an optimized TermDocs.skipTo() implementation. In
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particular, PhraseQuerys and conjunctive BooleanQuerys are
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faster when one clause has substantially fewer matches than the
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others. (A conjunctive BooleanQuery is a BooleanQuery where all
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clauses are required.) (cutting)
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4. Added new class ParallelMultiSearcher. Combined with
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RemoteSearchable this makes it easy to implement distributed
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search systems. (Jean-Francois Halleux via cutting)
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5. Added support for hit sorting. Results may now be sorted by any
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indexed field. For details see the javadoc for
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Searcher#search(Query, Sort). (Tim Jones via Cutting)
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6. Changed FSDirectory to auto-create a full directory tree that it
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needs by using mkdirs() instead of mkdir(). (Mladen Turk via Otis)
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7. Added a new span-based query API. This implements, among other
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things, nested phrases. See javadocs for details. (Doug Cutting)
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8. Added new method Query.getSimilarity(Searcher), and changed
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scorers to use it. This permits one to subclass a Query class so
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that it can specify it's own Similarity implementation, perhaps
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one that delegates through that of the Searcher. (Julien Nioche
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via Cutting)
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9. Added MultiReader, an IndexReader that combines multiple other
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IndexReaders. (Cutting)
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10. Added support for term vectors. See Field#isTermVectorStored().
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(Grant Ingersoll, Cutting & Dmitry)
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11. Fixed the old bug with escaping of special characters in query
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strings: http://issues.apache.org/bugzilla/show_bug.cgi?id=24665
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(Jean-Francois Halleux via Otis)
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12. Added support for overriding default values for the following,
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using system properties:
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- default commit lock timeout
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- default maxFieldLength
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- default maxMergeDocs
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- default mergeFactor
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- default minMergeDocs
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- default write lock timeout
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(Otis)
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13. Changed QueryParser.jj to allow '-' and '+' within tokens:
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http://issues.apache.org/bugzilla/show_bug.cgi?id=27491
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(Morus Walter via Otis)
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14. Changed so that the compound index format is used by default.
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This makes indexing a bit slower, but vastly reduces the chances
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of file handle problems. (Cutting)
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1.3 final
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1. Added catch of BooleanQuery$TooManyClauses in QueryParser to
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throw ParseException instead. (Erik Hatcher)
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2. Fixed a NullPointerException in Query.explain(). (Doug Cutting)
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3. Added a new method IndexReader.setNorm(), that permits one to
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alter the boosting of fields after an index is created.
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4. Distinguish between the final position and length when indexing a
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field. The length is now defined as the total number of tokens,
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instead of the final position, as it was previously. Length is
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used for score normalization (Similarity.lengthNorm()) and for
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controlling memory usage (IndexWriter.maxFieldLength). In both of
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these cases, the total number of tokens is a better value to use
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than the final token position. Position is used in phrase
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searching (see PhraseQuery and Token.setPositionIncrement()).
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5. Fix StandardTokenizer's handling of CJK characters (Chinese,
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Japanese and Korean ideograms). Previously contiguous sequences
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were combined in a single token, which is not very useful. Now
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each ideogram generates a separate token, which is more useful.
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1.3 RC3
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1. Added minMergeDocs in IndexWriter. This can be raised to speed
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indexing without altering the number of files, but only using more
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memory. (Julien Nioche via Otis)
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2. Fix bug #24786, in query rewriting. (bschneeman via Cutting)
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3. Fix bug #16952, in demo HTML parser, skip comments in
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javascript. (Christoph Goller)
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4. Fix bug #19253, in demo HTML parser, add whitespace as needed to
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output (Daniel Naber via Christoph Goller)
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5. Fix bug #24301, in demo HTML parser, long titles no longer
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hang things. (Christoph Goller)
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6. Fix bug #23534, Replace use of file timestamp of segments file
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with an index version number stored in the segments file. This
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resolves problems when running on file systems with low-resolution
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timestamps, e.g., HFS under MacOS X. (Christoph Goller)
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7. Fix QueryParser so that TokenMgrError is not thrown, only
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ParseException. (Erik Hatcher)
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8. Fix some bugs introduced by change 11 of RC2. (Christoph Goller)
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9. Fixed a problem compiling TestRussianStem. (Christoph Goller)
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10. Cleaned up some build stuff. (Erik Hatcher)
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1.3 RC2
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1. Added getFieldNames(boolean) to IndexReader, SegmentReader, and
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SegmentsReader. (Julien Nioche via otis)
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2. Changed file locking to place lock files in
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System.getProperty("java.io.tmpdir"), where all users are
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permitted to write files. This way folks can open and correctly
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lock indexes which are read-only to them.
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3. IndexWriter: added a new method, addDocument(Document, Analyzer),
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permitting one to easily use different analyzers for different
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documents in the same index.
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4. Minor enhancements to FuzzyTermEnum.
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(Christoph Goller via Otis)
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5. PriorityQueue: added insert(Object) method and adjusted IndexSearcher
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and MultiIndexSearcher to use it.
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(Christoph Goller via Otis)
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6. Fixed a bug in IndexWriter that returned incorrect docCount().
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(Christoph Goller via Otis)
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7. Fixed SegmentsReader to eliminate the confusing and slightly different
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behaviour of TermEnum when dealing with an enumeration of all terms,
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versus an enumeration starting from a specific term.
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This patch also fixes incorrect term document frequences when the same term
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is present in multiple segments.
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(Christoph Goller via Otis)
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8. Added CachingWrapperFilter and PerFieldAnalyzerWrapper. (Erik Hatcher)
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9. Added support for the new "compound file" index format (Dmitry
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Serebrennikov)
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10. Added Locale setting to QueryParser, for use by date range parsing.
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11. Changed IndexReader so that it can be subclassed by classes
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outside of its package. Previously it had package-private
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abstract methods. Also modified the index merging code so that it
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can work on an arbitrary IndexReader implementation, and added a
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new method, IndexWriter.addIndexes(IndexReader[]), to take
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advantage of this. (cutting)
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12. Added a limit to the number of clauses which may be added to a
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BooleanQuery. The default limit is 1024 clauses. This should
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stop most OutOfMemoryExceptions by prefix, wildcard and fuzzy
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queries which run amok. (cutting)
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13. Add new method: IndexReader.undeleteAll(). This undeletes all
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deleted documents which still remain in the index. (cutting)
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1.3 RC1
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1. Fixed PriorityQueue's clear() method.
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Fix for bug 9454, http://nagoya.apache.org/bugzilla/show_bug.cgi?id=9454
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(Matthijs Bomhoff via otis)
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2. Changed StandardTokenizer.jj grammar for EMAIL tokens.
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Fix for bug 9015, http://nagoya.apache.org/bugzilla/show_bug.cgi?id=9015
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(Dale Anson via otis)
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3. Added the ability to disable lock creation by using disableLuceneLocks
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system property. This is useful for read-only media, such as CD-ROMs.
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(otis)
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4. Added id method to Hits to be able to access the index global id.
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Required for sorting options.
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(carlson)
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5. Added support for new range query syntax to QueryParser.jj.
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(briangoetz)
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6. Added the ability to retrieve HTML documents' META tag values to
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HTMLParser.jj.
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(Mark Harwood via otis)
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7. Modified QueryParser to make it possible to programmatically specify the
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default Boolean operator (OR or AND).
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(Péter Halácsy via otis)
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8. Made many search methods and classes non-final, per requests.
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This includes IndexWriter and IndexSearcher, among others.
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(cutting)
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9. Added class RemoteSearchable, providing support for remote
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searching via RMI. The test class RemoteSearchableTest.java
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provides an example of how this can be used. (cutting)
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10. Added PhrasePrefixQuery (and supporting MultipleTermPositions). The
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test class TestPhrasePrefixQuery provides the usage example.
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(Anders Nielsen via otis)
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11. Changed the German stemming algorithm to ignore case while
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stripping. The new algorithm is faster and produces more equal
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stems from nouns and verbs derived from the same word.
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(gschwarz)
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12. Added support for boosting the score of documents and fields via
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the new methods Document.setBoost(float) and Field.setBoost(float).
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Note: This changes the encoding of an indexed value. Indexes
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should be re-created from scratch in order for search scores to
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be correct. With the new code and an old index, searches will
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yield very large scores for shorter fields, and very small scores
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for longer fields. Once the index is re-created, scores will be
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as before. (cutting)
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13. Added new method Token.setPositionIncrement().
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This permits, for the purpose of phrase searching, placing
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multiple terms in a single position. This is useful with
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stemmers that produce multiple possible stems for a word.
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This also permits the introduction of gaps between terms, so that
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terms which are adjacent in a token stream will not be matched by
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and exact phrase query. This makes it possible, e.g., to build
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an analyzer where phrases are not matched over stop words which
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have been removed.
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Finally, repeating a token with an increment of zero can also be
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used to boost scores of matches on that token. (cutting)
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14. Added new Filter class, QueryFilter. This constrains search
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results to only match those which also match a provided query.
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Results are cached, so that searches after the first on the same
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index using this filter are very fast.
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This could be used, for example, with a RangeQuery on a formatted
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date field to implement date filtering. One could re-use a
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single QueryFilter that matches, e.g., only documents modified
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within the last week. The QueryFilter and RangeQuery would only
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need to be reconstructed once per day. (cutting)
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15. Added a new IndexWriter method, getAnalyzer(). This returns the
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analyzer used when adding documents to this index. (cutting)
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16. Fixed a bug with IndexReader.lastModified(). Before, document
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deletion did not update this. Now it does. (cutting)
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17. Added Russian Analyzer.
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(Boris Okner via otis)
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18. Added a public, extensible scoring API. For details, see the
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javadoc for org.apache.lucene.search.Similarity.
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19. Fixed return of Hits.id() from float to int. (Terry Steichen via Peter).
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20. Added getFieldNames() to IndexReader and Segment(s)Reader classes.
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(Peter Mularien via otis)
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21. Added getFields(String) and getValues(String) methods.
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Contributed by Rasik Pandey on 2002-10-09
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(Rasik Pandey via otis)
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22. Revised internal search APIs. Changes include:
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a. Queries are no longer modified during a search. This makes
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it possible, e.g., to reuse the same query instance with
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multiple indexes from multiple threads.
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b. Term-expanding queries (e.g. PrefixQuery, WildcardQuery,
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etc.) now work correctly with MultiSearcher, fixing bugs 12619
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and 12667.
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c. Boosting BooleanQuery's now works, and is supported by the
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query parser (problem reported by Lee Mallabone). Thus a query
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like "(+foo +bar)^2 +baz" is now supported and equivalent to
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"(+foo^2 +bar^2) +baz".
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d. New method: Query.rewrite(IndexReader). This permits a
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query to re-write itself as an alternate, more primitive query.
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Most of the term-expanding query classes (PrefixQuery,
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WildcardQuery, etc.) are now implemented using this method.
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e. New method: Searchable.explain(Query q, int doc). This
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returns an Explanation instance that describes how a particular
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document is scored against a query. An explanation can be
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displayed as either plain text, with the toString() method, or
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as HTML, with the toHtml() method. Note that computing an
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explanation is as expensive as executing the query over the
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entire index. This is intended to be used in developing
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Similarity implementations, and, for good performance, should
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not be displayed with every hit.
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f. Scorer and Weight are public, not package protected. It now
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possible for someone to write a Scorer implementation that is
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not in the org.apache.lucene.search package. This is still
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fairly advanced programming, and I don't expect anyone to do
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this anytime soon, but at least now it is possible.
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|
|
g. Added public accessors to the primitive query classes
|
|
(TermQuery, PhraseQuery and BooleanQuery), permitting access to
|
|
their terms and clauses.
|
|
|
|
Caution: These are extensive changes and they have not yet been
|
|
tested extensively. Bug reports are appreciated.
|
|
(cutting)
|
|
|
|
23. Added convenience RAMDirectory constructors taking File and String
|
|
arguments, for easy FSDirectory to RAMDirectory conversion.
|
|
(otis)
|
|
|
|
24. Added code for manual renaming of files in FSDirectory, since it
|
|
has been reported that java.io.File's renameTo(File) method sometimes
|
|
fails on Windows JVMs.
|
|
(Matt Tucker via otis)
|
|
|
|
25. Refactored QueryParser to make it easier for people to extend it.
|
|
Added the ability to automatically lower-case Wildcard terms in
|
|
the QueryParser.
|
|
(Tatu Saloranta via otis)
|
|
|
|
|
|
1.2 RC6
|
|
|
|
1. Changed QueryParser.jj to have "?" be a special character which
|
|
allowed it to be used as a wildcard term. Updated TestWildcard
|
|
unit test also. (Ralf Hettesheimer via carlson)
|
|
|
|
1.2 RC5
|
|
|
|
1. Renamed build.properties to default.properties and updated
|
|
the BUILD.txt document to describe how to override the
|
|
default.property settings without having to edit the file. This
|
|
brings the build process closer to Scarab's build process.
|
|
(jon)
|
|
|
|
2. Added MultiFieldQueryParser class. (Kelvin Tan, via otis)
|
|
|
|
3. Updated "powered by" links. (otis)
|
|
|
|
4. Fixed instruction for setting up JavaCC - Bug #7017 (otis)
|
|
|
|
5. Added throwing exception if FSDirectory could not create diectory
|
|
- Bug #6914 (Eugene Gluzberg via otis)
|
|
|
|
6. Update MultiSearcher, MultiFieldParse, Constants, DateFilter,
|
|
LowerCaseTokenizer javadoc (otis)
|
|
|
|
7. Added fix to avoid NullPointerException in results.jsp
|
|
(Mark Hayes via otis)
|
|
|
|
8. Changed Wildcard search to find 0 or more char instead of 1 or more
|
|
(Lee Mallobone, via otis)
|
|
|
|
9. Fixed error in offset issue in GermanStemFilter - Bug #7412
|
|
(Rodrigo Reyes, via otis)
|
|
|
|
10. Added unit tests for wildcard search and DateFilter (otis)
|
|
|
|
11. Allow co-existence of indexed and non-indexed fields with the same name
|
|
(cutting/casper, via otis)
|
|
|
|
12. Add escape character to query parser.
|
|
(briangoetz)
|
|
|
|
13. Applied a patch that ensures that searches that use DateFilter
|
|
don't throw an exception when no matches are found. (David Smiley, via
|
|
otis)
|
|
|
|
14. Fixed bugs in DateFilter and wildcardquery unit tests. (cutting, otis, carlson)
|
|
|
|
|
|
1.2 RC4
|
|
|
|
1. Updated contributions section of website.
|
|
Add XML Document #3 implementation to Document Section.
|
|
Also added Term Highlighting to Misc Section. (carlson)
|
|
|
|
2. Fixed NullPointerException for phrase searches containing
|
|
unindexed terms, introduced in 1.2RC3. (cutting)
|
|
|
|
3. Changed document deletion code to obtain the index write lock,
|
|
enforcing the fact that document addition and deletion cannot be
|
|
performed concurrently. (cutting)
|
|
|
|
4. Various documentation cleanups. (otis, acoliver)
|
|
|
|
5. Updated "powered by" links. (cutting, jon)
|
|
|
|
6. Fixed a bug in the GermanStemmer. (Bernhard Messer, via otis)
|
|
|
|
7. Changed Term and Query to implement Serializable. (scottganyo)
|
|
|
|
8. Fixed to never delete indexes added with IndexWriter.addIndexes().
|
|
(cutting)
|
|
|
|
9. Upgraded to JUnit 3.7. (otis)
|
|
|
|
1.2 RC3
|
|
|
|
1. IndexWriter: fixed a bug where adding an optimized index to an
|
|
empty index failed. This was encountered using addIndexes to copy
|
|
a RAMDirectory index to an FSDirectory.
|
|
|
|
2. RAMDirectory: fixed a bug where RAMInputStream could not read
|
|
across more than across a single buffer boundary.
|
|
|
|
3. Fix query parser so it accepts queries with unicode characters.
|
|
(briangoetz)
|
|
|
|
4. Fix query parser so that PrefixQuery is used in preference to
|
|
WildcardQuery when there's only an asterisk at the end of the
|
|
term. Previously PrefixQuery would never be used.
|
|
|
|
5. Fix tests so they compile; fix ant file so it compiles tests
|
|
properly. Added test cases for Analyzers and PriorityQueue.
|
|
|
|
6. Updated demos, added Getting Started documentation. (acoliver)
|
|
|
|
7. Added 'contributions' section to website & docs. (carlson)
|
|
|
|
8. Removed JavaCC from source distribution for copyright reasons.
|
|
Folks must now download this separately from metamata in order to
|
|
compile Lucene. (cutting)
|
|
|
|
9. Substantially improved the performance of DateFilter by adding the
|
|
ability to reuse TermDocs objects. (cutting)
|
|
|
|
10. Added IndexReader methods:
|
|
public static boolean indexExists(String directory);
|
|
public static boolean indexExists(File directory);
|
|
public static boolean indexExists(Directory directory);
|
|
public static boolean isLocked(Directory directory);
|
|
public static void unlock(Directory directory);
|
|
(cutting, otis)
|
|
|
|
11. Fixed bugs in GermanAnalyzer (gschwarz)
|
|
|
|
|
|
1.2 RC2, 19 October 2001:
|
|
- added sources to distribution
|
|
- removed broken build scripts and libraries from distribution
|
|
- SegmentsReader: fixed potential race condition
|
|
- FSDirectory: fixed so that getDirectory(xxx,true) correctly
|
|
erases the directory contents, even when the directory
|
|
has already been accessed in this JVM.
|
|
- RangeQuery: Fix issue where an inclusive range query would
|
|
include the nearest term in the index above a non-existant
|
|
specified upper term.
|
|
- SegmentTermEnum: Fix NullPointerException in clone() method
|
|
when the Term is null.
|
|
- JDK 1.1 compatibility fix: disabled lock files for JDK 1.1,
|
|
since they rely on a feature added in JDK 1.2.
|
|
|
|
1.2 RC1 (first Apache release), 2 October 2001:
|
|
- packages renamed from com.lucene to org.apache.lucene
|
|
- license switched from LGPL to Apache
|
|
- ant-only build -- no more makefiles
|
|
- addition of lock files--now fully thread & process safe
|
|
- addition of German stemmer
|
|
- MultiSearcher now supports low-level search API
|
|
- added RangeQuery, for term-range searching
|
|
- Analyzers can choose tokenizer based on field name
|
|
- misc bug fixes.
|
|
|
|
1.01b (last Sourceforge release), 2 July 2001
|
|
. a few bug fixes
|
|
. new Query Parser
|
|
. new prefix query (search for "foo*" matches "food")
|
|
|
|
1.0, 2000-10-04
|
|
|
|
This release fixes a few serious bugs and also includes some
|
|
performance optimizations, a stemmer, and a few other minor
|
|
enhancements.
|
|
|
|
0.04 2000-04-19
|
|
|
|
Lucene now includes a grammar-based tokenizer, StandardTokenizer.
|
|
|
|
The only tokenizer included in the previous release (LetterTokenizer)
|
|
identified terms consisting entirely of alphabetic characters. The
|
|
new tokenizer uses a regular-expression grammar to identify more
|
|
complex classes of terms, including numbers, acronyms, email
|
|
addresses, etc.
|
|
|
|
StandardTokenizer serves two purposes:
|
|
|
|
1. It is a much better, general purpose tokenizer for use by
|
|
applications as is.
|
|
|
|
The easiest way for applications to start using
|
|
StandardTokenizer is to use StandardAnalyzer.
|
|
|
|
2. It provides a good example of grammar-based tokenization.
|
|
|
|
If an application has special tokenization requirements, it can
|
|
implement a custom tokenizer by copying the directory containing
|
|
the new tokenizer into the application and modifying it
|
|
accordingly.
|
|
|
|
0.01, 2000-03-30
|
|
|
|
First open source release.
|
|
|
|
The code has been re-organized into a new package and directory
|
|
structure for this release. It builds OK, but has not been tested
|
|
beyond that since the re-organization.
|