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MultiTermQuery.javaAPI DocApache Lucene 1.4.32976Tue Mar 30 00:48:04 BST 2004org.apache.lucene.search

MultiTermQuery

public abstract class MultiTermQuery extends Query
A {@link Query} that matches documents containing a subset of terms provided by a {@link FilteredTermEnum} enumeration.

MultiTermQuery is not designed to be used by itself.
The reason being that it is not intialized with a {@link FilteredTermEnum} enumeration. A {@link FilteredTermEnum} enumeration needs to be provided.

For example, {@link WildcardQuery} and {@link FuzzyQuery} extend MultiTermQuery to provide {@link WildcardTermEnum} and {@link FuzzyTermEnum}, respectively.

Fields Summary
private Term
term
Constructors Summary
public MultiTermQuery(Term term)
Constructs a query for terms matching term.

        this.term = term;
Methods Summary
public org.apache.lucene.search.Querycombine(org.apache.lucene.search.Query[] queries)

      return Query.mergeBooleanQueries(queries);
protected abstract org.apache.lucene.search.FilteredTermEnumgetEnum(org.apache.lucene.index.IndexReader reader)
Construct the enumeration to be used, expanding the pattern term.

public org.apache.lucene.index.TermgetTerm()
Returns the pattern term.
 return term; 
public org.apache.lucene.search.Queryrewrite(org.apache.lucene.index.IndexReader reader)
      FilteredTermEnum enumerator = getEnum(reader);
      BooleanQuery query = new BooleanQuery();
      try {
        do {
          Term t = enumerator.term();
          if (t != null) {
            TermQuery tq = new TermQuery(t);      // found a match
            tq.setBoost(getBoost() * enumerator.difference()); // set the boost
            query.add(tq, false, false);          // add to query
          }
        } while (enumerator.next());
      } finally {
        enumerator.close();
      }
      return query;
    
public java.lang.StringtoString(java.lang.String field)
Prints a user-readable version of this query.
        StringBuffer buffer = new StringBuffer();
        if (!term.field().equals(field)) {
            buffer.append(term.field());
            buffer.append(":");
        }
        buffer.append(term.text());
        if (getBoost() != 1.0f) {
            buffer.append("^");
            buffer.append(Float.toString(getBoost()));
        }
        return buffer.toString();