content: package org.apache.solr.search.function.distance;
  
  /**
   * 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.search.spell.StringDistance;
  import org.apache.solr.search.function.DocValues;
  import org.apache.solr.search.function.ValueSource;
  
  import java.io.IOException;
  import java.util.Map;
  
  
  /**
   *
   *
   **/
  public class StringDistanceFunction extends ValueSource {
    protected ValueSource str1, str2;
    protected StringDistance dist;
  
    /**
     * @param str1
     * @param str2
     * @param measure
     */
    public StringDistanceFunction(ValueSource str1, ValueSource str2, StringDistance measure) {
      this.str1 = str1;
      this.str2 = str2;
      dist = measure;
  
  
    }
  
    @Override
    public DocValues getValues(Map context, IndexReader reader) throws IOException {
      final DocValues str1DV = str1.getValues(context, reader);
      final DocValues str2DV = str2.getValues(context, reader);
      return new DocValues() {
  
        @Override
        public float floatVal(int doc) {
          return dist.getDistance(str1DV.strVal(doc), str2DV.strVal(doc));
        }
  
        @Override
        public int intVal(int doc) {
          return (int) doubleVal(doc);
        }
  
        @Override
        public long longVal(int doc) {
          return (long) doubleVal(doc);
        }
  
        @Override
        public double doubleVal(int doc) {
          return (double) floatVal(doc);
        }
  
        @Override
        public String toString(int doc) {
          StringBuilder sb = new StringBuilder();
          sb.append("strdist").append('(');
          sb.append(str1DV.toString(doc)).append(',').append(str2DV.toString(doc))
                  .append(", dist=").append(dist.getClass().getName());
          sb.append(')');
          return sb.toString();
        }
      };
    }
  
    @Override
    public String description() {
      StringBuilder sb = new StringBuilder();
      sb.append("strdist").append('(');
      sb.append(str1).append(',').append(str2).append(", dist=").append(dist.getClass().getName());
      sb.append(')');
      return sb.toString();
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (!(o instanceof StringDistanceFunction)) return false;
  
      StringDistanceFunction that = (StringDistanceFunction) o;
  
      if (!dist.equals(that.dist)) return false;
      if (!str1.equals(that.str1)) return false;
      if (!str2.equals(that.str2)) return false;
  
      return true;
    }
  
    @Override
    public int hashCode() {
      int result = str1.hashCode();
      result = 31 * result + str2.hashCode();
      result = 31 * result + dist.hashCode();
      return result;
    }
  }
  