Hello all,
I am tying to write a simple autosuggest functionality. I was looking
at some auto suggest code, and came over this post
http://stackoverflow.com/questions/120180/how-to-do-query-auto-completion-suggestions-in-lucene
I have been stuck with the some strange words, trying to see how they
are generated. Here's the Anayzer:
public class AutoCompleteAnalyzer extends Analyzer {
public TokenStream tokenStream(String fieldName, Reader reader) {
TokenStream result = null;
result = new StandardTokenizer(Version.LUCENE_36, reader);
result = new EdgeNGramTokenFilter(result,
EdgeNGramTokenFilter.Side.FRONT,
1, 20);
return result;
}
}
And this is the relevant method that does the indexing. It's being
called with reindexOn("title");
private void reindexOn(String keyword) throws CorruptIndexException,
IOException {
log.info("indexing on " + keyword);
Analyzer analyzer = new AutoCompleteAnalyzer();
IndexWriterConfig config = new
IndexWriterConfig(Version.LUCENE_36,
analyzer);
IndexWriter analyticalWriter = new
IndexWriter(suggestIndexDirectory, config);
analyticalWriter.commit(); // needed to create the initiale
index
IndexReader indexReader =
IndexReader.open(productsIndexDirectory);
Map<String, Integer> wordsMap = new HashMap<String, Integer>();
LuceneDictionary dict = new LuceneDictionary(indexReader,
keyword);
BytesRefIterator iter = dict.getWordsIterator();
BytesRef ref = null;
while ((ref = iter.next()) != null) {
String word = new String(ref.bytes);
int len = word.length();
if (len < 3) {
continue;
}
if (wordsMap.containsKey(word)) {
String msg = "Word " + word + " Already Exists";
throw new IllegalStateException(msg);
}
wordsMap.put(word, indexReader.docFreq(new
Term(keyword, word)));
}
for (String word : wordsMap.keySet()) {
Document doc = new Document();
Field field = null;
field = new Field(SOURCE_WORD_FIELD, word,
Field.Store.YES,
Field.Index.NOT_ANALYZED);
doc.add(field);
field = new Field(GRAMMED_WORDS_FIELD, word,
Field.Store.YES, Field.Index.ANALYZED);
doc.add(field);
String count = Integer.toString(wordsMap.get(word));
field = new Field(COUNT_FIELD, count, Field.Store.NO,
Field.Index.NOT_ANALYZED); // count
doc.add(field);
analyticalWriter.addDocument(doc);
}
analyticalWriter.commit();
analyticalWriter.close();
indexReader.close();
}
private static final String GRAMMED_WORDS_FIELD = "words";
private static final String SOURCE_WORD_FIELD = "sourceWord";
private static final String COUNT_FIELD = "count";
And now, my unit testing :
@BeforeClass
public static void setUp() throws CorruptIndexException, IOException {
String idxFileName = "myIndexDirectory";
Indexer indexer = new Indexer(idxFileName);
indexer.addDoc("Apache Lucene in Action");
indexer.addDoc("Lord of the Rings");
indexer.addDoc("Apache Solr in Action");
indexer.addDoc("apples and Oranges");
indexer.addDoc("apple iphone");
indexer.reindexKeywords();
search = new SearchEngine(idxFileName);
}
The strange part, is looking under the index I found there are
sourceWords (lordne, applee, solres ). I understand that the ngram
will result in parts of each word. Ex:
l
lo
lor
lord
But of these go into one field, but what about "lorden" and "solres"
?? I checked the docs for this, and looked into Jira, but didn't find
relevant info.
Is there something I am missing ??
I understand there could be easier ways to create this functionality
(http://wiki.apache.org/lucene-java/SpellChecker), but I like to
resolve this issue, and to
understand if I am doing something wrong.
Thank you in advance.
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