Examples of com.dbxml.db.core.indexer.Indexer

com.dbxml.db.core.indexer.Indexer
Indexer is the abstract indexing interface for dbXML. An Indexer object is implemented in order to retrieve and manage indexes.

Any number of Indexer instances may be associated with a single Collection. The type of Indexer utilized by a query depends on the 'Style' of Indexer and the type of QueryResolver that is being used to performt he query. Currently, dbXML only internally supports one kind of Indexer: 'XPath'.

   }


   private Key[] evaluateSelect(Transaction tx, SelectQueryNode node) throws QueryException {
      try {
         IndexPattern pattern = new IndexPattern(context.getSymbols(), node.name, nsMap);
         Indexer idx = context.getIndexManager().getBestIndexer(Indexer.STYLE_FULLTEXT, pattern);
         if ( idx != null ) {
            String value = node.value;


            // If it's a FullTextIndexer, check it for stop words instead
            // of querying it for no reason.
            if ( idx instanceof FullTextIndexer ) {
               FullTextIndexer fidx = (FullTextIndexer)idx;
               WordStemmer stemmer = fidx.getWordStemmer();
               if ( stemmer != null )
                  value = stemmer.normalizeCase(value);


               Set stopWords = fidx.getStopWords();
               if ( stopWords != null && stopWords.contains(value) )
                  return null;
            }


            IndexQuery idxQry = new IndexQuery(pattern, node.operator, new Value(node.value));
            IndexMatch[] matches = idx.queryMatches(tx, idxQry);
            return QueryEngine.getUniqueKeys(matches);
         }
         else
            throw new ProcessingException("No FullText Index to support pattern '"+node.name+"'");
      }

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            if ( nk.keys != null )
               ks.add(nk.keys);
            else if ( name != null ) {
               // Try to use a NameIndex to resolve the path component
               IndexPattern pattern = new IndexPattern(symbols, name, nsMap);
               Indexer idx = context.getIndexManager().getBestIndexer(Indexer.STYLE_NODENAME, pattern);
               if ( idx != null ) {
                  IndexMatch[] matches = idx.queryMatches(tx, new IndexQueryANY(pattern));
                  Key[] keys = QueryEngine.getUniqueKeys(matches);
                  ks.add(keys);
               }
            }
         }

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      try {
         IndexPattern pattern = iq.getPattern();
         if ( pattern.isInvalid() )
            return null;


         Indexer idx = context.getIndexManager().getBestIndexer(Indexer.STYLE_NODEVALUE, pattern);
         if ( idx != null ) {
            IndexMatch[] matches = idx.queryMatches(tx, iq);
            Key[] keys = QueryEngine.getUniqueKeys(matches);
            return new NamedKeys(nk.name, nk.attribute, keys);
         }
      }
      catch ( Exception e ) {

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Related Classes of com.dbxml.db.core.indexer.Indexer

com.dbxml.db.common.fulltext.FullTextQuery

com.dbxml.db.common.xpath.XPathQuery

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