content: package org.apache.lucene.search.regex;
  
  /**
   * 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.search.MultiTermQuery;
  import org.apache.lucene.search.FilteredTermEnum;
  import org.apache.lucene.index.Term;
  import org.apache.lucene.index.IndexReader;
  import org.apache.lucene.util.ToStringUtils;
  
  import java.io.IOException;
  
  /** Implements the regular expression term search query.
   * The expressions supported depend on the regular expression implementation
   * used by way of the {@link RegexCapabilities} interface.
   *
   * @see RegexTermEnum
   */
  public class RegexQuery extends MultiTermQuery implements RegexQueryCapable {
    private RegexCapabilities regexImpl = new JavaUtilRegexCapabilities();
    private Term term;
  
    /** Constructs a query for terms matching <code>term</code>. */
    public RegexQuery(Term term) {
      this.term = term;
    }
    
    public Term getTerm() { return term; }
  
    /**
     * Defines which {@link RegexCapabilities} implementation is used by this instance.
     *
     * @param impl
     */
    public void setRegexImplementation(RegexCapabilities impl) {
      this.regexImpl = impl;
    }
  
    /**
     * @return The implementation used by this instance.
     */
    public RegexCapabilities getRegexImplementation() {
      return regexImpl;
    }
  
    @Override
    protected FilteredTermEnum getEnum(IndexReader reader) throws IOException {
      return new RegexTermEnum(reader, term, regexImpl);
    }
  
    @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();
    }
  
    /* generated by IntelliJ IDEA */
    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;
      if (!super.equals(o)) return false;
  
      final RegexQuery that = (RegexQuery) o;
  
      return regexImpl.equals(that.regexImpl);
    }
  
    /* generated by IntelliJ IDEA */
    @Override
    public int hashCode() {
      int result = super.hashCode();
      result = 29 * result + regexImpl.hashCode();
      return result;
    }
  }
  