diffcases.1139461.WildcardQuery.1139461_WildcardQuery_0_t Maven / Gradle / Ivy

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 package org.apache.lucene.search;
 
 /**
  * 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.
  */
 
 import org.apache.lucene.index.IndexReader;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.util.ToStringUtils;
 
 import java.io.IOException;
 
 /** Implements the wildcard search query. Supported wildcards are *, which
  * matches any character sequence (including the empty one), and ?,
  * which matches any single character. Note this query can be slow, as it
  * needs to iterate over many terms. In order to prevent extremely slow WildcardQueries,
  * a Wildcard term should not start with one of the wildcards * or
  * ?.
  * 
  * This query uses the {@link
  * MultiTermQuery#CONSTANT_SCORE_AUTO_REWRITE_DEFAULT}
  * rewrite method.
  *
  * @see WildcardTermEnum */
 public class WildcardQuery extends MultiTermQuery {
   private boolean termContainsWildcard;
   private boolean termIsPrefix;
   protected Term term;
     
   public WildcardQuery(Term term) {
     this.term = term;
     String text = term.text();
     this.termContainsWildcard = (text.indexOf('*') != -1)
         || (text.indexOf('?') != -1);
     this.termIsPrefix = termContainsWildcard 
         && (text.indexOf('?') == -1) 
         && (text.indexOf('*') == text.length() - 1);
   }
 
   @Override
   protected FilteredTermEnum getEnum(IndexReader reader) throws IOException {
    if (termIsPrefix) {
      return new PrefixTermEnum(reader, term.createTerm(term.text()
          .substring(0, term.text().indexOf('*')))); 
    } else if (termContainsWildcard) {
       return new WildcardTermEnum(reader, getTerm());
    } else {
       return new SingleTermEnum(reader, getTerm());
   }
  }
   
   /**
    * Returns the pattern term.
    */
   public Term getTerm() {
     return term;
   }
 
   /** Prints a user-readable version of this query. */
   @Override
   public String toString(String field) {
     StringBuilder buffer = new StringBuilder();
     if (!term.field().equals(field)) {
       buffer.append(term.field());
       buffer.append(":");
     }
     buffer.append(term.text());
     buffer.append(ToStringUtils.boost(getBoost()));
     return buffer.toString();
   }
 
   @Override
   public int hashCode() {
     final int prime = 31;
     int result = super.hashCode();
     result = prime * result + ((term == null) ? 0 : term.hashCode());
     return result;
   }
 
   @Override
   public boolean equals(Object obj) {
     if (this == obj)
       return true;
     if (!super.equals(obj))
       return false;
     if (getClass() != obj.getClass())
       return false;
     WildcardQuery other = (WildcardQuery) obj;
     if (term == null) {
       if (other.term != null)
         return false;
     } else if (!term.equals(other.term))
       return false;
     return true;
   }
 
 }