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.io.Serializable;
  import java.util.AbstractList;
  import java.util.List;
  import org.apache.commons.lang.builder.ToStringBuilder;
  
  
  public class ComboList extends AbstractList<Object> {    
      public static class Factory implements Serializable {
          Pointer[] index;
          int[] sizes;
          
          public Factory(int... sizes) {
              this.sizes = sizes;
              int total = 0;
              for(int size: sizes) {
                  total+=size;
              }
              index = new Pointer[total];
              int i=0;
              int j=0;
              for(int size: sizes) {
                  for(int z=0; z<size; z++) {
                      index[j] = new Pointer(i, z);
                      j++;
                  }
                  i++;
              }
          }
          
          public ComboList create(List[] delegates) {
              if(delegates.length!=sizes.length) {
                  throw new RuntimeException("Expected " + sizes.length + " lists, but instead got " + delegates.length + " lists");
              }
              for(int i=0; i<delegates.length; i++) {
                  List l = delegates[i];
                  if(l==null || l.size() != sizes[i]) {
                      throw new RuntimeException("Got unexpected delegates to ComboList: " + ToStringBuilder.reflectionToString(delegates));
                  }
              }
              return new ComboList(delegates, index);
          }
      }
      
      private static class Pointer implements Serializable {
          int listIndex;
          int subIndex;
          
          public Pointer(int listIndex, int subIndex) {
              this.listIndex = listIndex;
              this.subIndex = subIndex;
          }
          
      }
      
      Pointer[] _index;
      List[] _delegates;
      
      public ComboList(List[] delegates, Pointer[] index) {
          _index = index;
          _delegates = delegates;
      }
              
      @Override
      public Object get(int i) {
          Pointer ptr = _index[i];
          return _delegates[ptr.listIndex].get(ptr.subIndex);
      }
  
      @Override
      public int size() {
          return _index.length;
      }
  }
  