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 storm.trident.tuple;
  
  import java.util.AbstractList;
  import java.util.ArrayList;
  import java.util.List;
  
  public class ConsList extends AbstractList<Object> {
      List<Object> _elems;
      Object _first;
  
      // for kryo
      private ConsList() {
          _elems = new ArrayList<>();
      }
  
      public ConsList(Object o, List<Object> elems) {
          _elems = elems;
          _first = o;
      }
  
      @Override
      public Object get(int i) {
          if(i==0) return _first;
          else {
              return _elems.get(i - 1);
          }
      }
  
      @Override
      public int size() {
          return _first == null ? _elems.size() : _elems.size() + 1;
      }
  
      // for kryo
      @Override
      public void add(int index, Object element) {
          if (index == 0) {
              _first = element;
          } else {
              _elems.add(index - 1, element);
          }
      }
  }
  