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.search.FieldCache;
  
  /**
   * A base class for ValueSource implementations that retrieve values for
   * a single field from the {@link org.apache.lucene.search.FieldCache}.
   *
   * @version $Id: FieldCacheSource.java 1065312 2011-01-30 16:08:25Z rmuir $
   */
  public abstract class FieldCacheSource extends ValueSource {
    protected String field;
    protected FieldCache cache = FieldCache.DEFAULT;
  
    public FieldCacheSource(String field) {
      this.field=field;
    }
  
    public FieldCache getFieldCache() {
      return cache;
    }
  
    @Override
    public String description() {
      return field;
    }
  
    @Override
    public boolean equals(Object o) {
      if (!(o instanceof FieldCacheSource)) return false;
      FieldCacheSource other = (FieldCacheSource)o;
      return this.field.equals(other.field)
             && this.cache == other.cache;
    }
  
    @Override
    public int hashCode() {
      return cache.hashCode() + field.hashCode();
    };
  
  }
  