content: /**
   * 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.
   */
  
  package org.apache.solr.search;
  
  import org.apache.lucene.index.IndexReader;
  import org.apache.lucene.index.Term;
  import org.apache.lucene.search.Query;
  import org.apache.lucene.search.ConstantScoreQuery;
  
  import java.io.IOException;
  
  /**
   * @version $Id: ConstantScorePrefixQuery.java 1065312 2011-01-30 16:08:25Z rmuir $
   */
  public class ConstantScorePrefixQuery extends Query {
    private final Term prefix;
  
    public ConstantScorePrefixQuery(Term prefix) {
      this.prefix = prefix;
    }
  
    /** Returns the prefix  for this query */
    public Term getPrefix() { return prefix; }
  
    @Override
    public Query rewrite(IndexReader reader) throws IOException {
      // TODO: if number of terms are low enough, rewrite to a BooleanQuery
      // for potentially faster execution.
      // TODO: cache the bitset somewhere instead of regenerating it
      Query q = new ConstantScoreQuery(new PrefixFilter(prefix));
      q.setBoost(getBoost());
      return q;
    }
  
    /** Prints a user-readable version of this query. */
    @Override
    public String toString(String field)
    {
      StringBuilder buffer = new StringBuilder();
      if (!prefix.field().equals(field)) {
        buffer.append(prefix.field());
        buffer.append(":");
      }
      buffer.append(prefix.text());
      buffer.append('*');
      if (getBoost() != 1.0f) {
        buffer.append("^");
        buffer.append(Float.toString(getBoost()));
      }
      return buffer.toString();
    }
  
      /** Returns true if <code>o</code> is equal to this. */
      @Override
      public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof ConstantScorePrefixQuery)) return false;
        ConstantScorePrefixQuery other = (ConstantScorePrefixQuery) o;
        return this.prefix.equals(other.prefix) && this.getBoost()==other.getBoost();
      }
  
      /** Returns a hash code value for this object.*/
      @Override
      public int hashCode() {
        int h = prefix.hashCode() ^ Float.floatToIntBits(getBoost());
        h ^= (h << 14) | (h >>> 19);  // reversible (1 to 1) transformation unique to ConstantScorePrefixQuery
        return h;
      }
  
  }
  