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.Searcher;
  
  import java.io.IOException;
  import java.util.Map;
  
  /** A function with a single argument
   */
   public abstract class SingleFunction extends ValueSource {
    protected final ValueSource source;
  
    public SingleFunction(ValueSource source) {
      this.source = source;
    }
  
    protected abstract String name();
  
    @Override
    public String description() {
      return name() + '(' + source.description() + ')';
    }
  
    @Override
    public int hashCode() {
      return source.hashCode() + name().hashCode();
    }
  
    @Override
    public boolean equals(Object o) {
      if (this.getClass() != o.getClass()) return false;
      SingleFunction other = (SingleFunction)o;
      return this.name().equals(other.name())
           && this.source.equals(other.source);
    }
  
    @Override
    public void createWeight(Map context, Searcher searcher) throws IOException {
      source.createWeight(context, searcher);
    }
  }