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.function;
  
  import org.apache.lucene.index.IndexReader;
  import org.apache.lucene.search.Searcher;
  
  import java.io.IOException;
  import java.util.Map;
  
  /**
   * <code>LinearFloatFunction</code> implements a linear function over
   * another {@link org.apache.solr.search.function.ValueSource}.
   * <br>
   * Normally Used as an argument to a {@link org.apache.solr.search.function.FunctionQuery}
   *
   * @version $Id: RangeMapFloatFunction.java 1065312 2011-01-30 16:08:25Z rmuir $
   */
  public class RangeMapFloatFunction extends ValueSource {
    protected final ValueSource source;
    protected final float min;
    protected final float max;
    protected final float target;
    protected final Float defaultVal;
  
    public RangeMapFloatFunction(ValueSource source, float min, float max, float target, Float def) {
      this.source = source;
      this.min = min;
      this.max = max;
      this.target = target;
      this.defaultVal = def;
    }
  
    @Override
    public String description() {
      return "map(" + source.description() + "," + min + "," + max + "," + target + ")";
    }
  
    @Override
    public DocValues getValues(Map context, IndexReader reader) throws IOException {
      final DocValues vals =  source.getValues(context, reader);
      return new DocValues() {
        @Override
        public float floatVal(int doc) {
          float val = vals.floatVal(doc);
          return (val>=min && val<=max) ? target : (defaultVal == null ? val : defaultVal);
        }
        @Override
        public int intVal(int doc) {
          return (int)floatVal(doc);
        }
        @Override
        public long longVal(int doc) {
          return (long)floatVal(doc);
        }
        @Override
        public double doubleVal(int doc) {
          return (double)floatVal(doc);
        }
        @Override
        public String strVal(int doc) {
          return Float.toString(floatVal(doc));
        }
        @Override
        public String toString(int doc) {
          return "map(" + vals.toString(doc) + ",min=" + min + ",max=" + max + ",target=" + target + ")";
        }
      };
    }
  
    @Override
    public void createWeight(Map context, Searcher searcher) throws IOException {
      source.createWeight(context, searcher);
    }
  
    @Override
    public int hashCode() {
      int h = source.hashCode();
      h ^= (h << 10) | (h >>> 23);
      h += Float.floatToIntBits(min);
      h ^= (h << 14) | (h >>> 19);
      h += Float.floatToIntBits(max);
      h ^= (h << 13) | (h >>> 20);
      h += Float.floatToIntBits(target);
      if (defaultVal != null)
        h += defaultVal.hashCode();
      return h;
    }
  
    @Override
    public boolean equals(Object o) {
      if (RangeMapFloatFunction.class != o.getClass()) return false;
      RangeMapFloatFunction other = (RangeMapFloatFunction)o;
      return  this.min == other.min
           && this.max == other.max
           && this.target == other.target
           && this.source.equals(other.source)
           && (this.defaultVal == other.defaultVal || (this.defaultVal != null && this.defaultVal.equals(other.defaultVal)));
    }
  }
  