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SrndTruncQuery.javaAPI DocApache Lucene 2.1.03308Wed Feb 14 10:45:42 GMT 2007org.apache.lucene.queryParser.surround.query

SrndTruncQuery

public class SrndTruncQuery extends SimpleTerm
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Fields Summary
private final String
truncated
private final char
unlimited
private final char
mask
private String
prefix
private Pattern
pattern
Constructors Summary
public SrndTruncQuery(String truncated, char unlimited, char mask)

    super(false); /* not quoted */
    this.truncated = truncated;
    this.unlimited = unlimited;
    this.mask = mask;
    truncatedToPrefixAndPattern();
Methods Summary
protected voidappendRegExpForChar(char c, java.lang.StringBuffer re)

    if (c == unlimited)
      re.append(".*");
    else if (c == mask)
      re.append(".");
    else
      re.append(c);
public java.lang.StringgetTruncated()

return truncated;
protected booleanmatchingChar(char c)

    return (c != unlimited) && (c != mask);
public java.lang.StringtoStringUnquoted()

return getTruncated();
protected voidtruncatedToPrefixAndPattern()

    int i = 0;
    while ((i < truncated.length()) && matchingChar(truncated.charAt(i))) {
      i++;
    }
    prefix = truncated.substring(0, i);
    
    StringBuffer re = new StringBuffer();
    while (i < truncated.length()) {
      appendRegExpForChar(truncated.charAt(i), re);
      i++;
    }
    pattern = Pattern.compile(re.toString());
public voidvisitMatchingTerms(org.apache.lucene.index.IndexReader reader, java.lang.String fieldName, MatchingTermVisitor mtv)

    boolean expanded = false;
    int prefixLength = prefix.length();
    TermEnum enumerator = reader.terms(new Term(fieldName, prefix));
    Matcher matcher = pattern.matcher("");
    try {
      do {
        Term term = enumerator.term();
        if (term != null) {
          String text = term.text();
          if ((! text.startsWith(prefix)) || (! term.field().equals(fieldName))) {
            break;
          } else {
            matcher.reset( text.substring(prefixLength));
            if (matcher.matches()) {
              mtv.visitMatchingTerm(term);
              expanded = true;
            }
          }
        }
      } while (enumerator.next());
    } finally {
      enumerator.close();
      matcher.reset();
    }
    if (! expanded) {
      System.out.println("No terms in " + fieldName + " field for: " + toString());
    }