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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.channel.group;
  
  import io.netty.util.internal.ObjectUtil;
  
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  
  /**
   */
  final class CombinedIterator<E> implements Iterator<E> {
  
      private final Iterator<E> i1;
      private final Iterator<E> i2;
      private Iterator<E> currentIterator;
  
      CombinedIterator(Iterator<E> i1, Iterator<E> i2) {
          this.i1 = ObjectUtil.checkNotNull(i1, "i1");
          this.i2 = ObjectUtil.checkNotNull(i2, "i2");
          this.currentIterator = i1;
      }
  
      @Override
      public boolean hasNext() {
          for (;;) {
              if (currentIterator.hasNext()) {
                  return true;
              }
  
              if (currentIterator == i1) {
                  currentIterator = i2;
              } else {
                  return false;
              }
          }
      }
  
      @Override
      public E next() {
          for (;;) {
              try {
                  return currentIterator.next();
              } catch (NoSuchElementException e) {
                  if (currentIterator == i1) {
                      currentIterator = i2;
                  } else {
                      throw e;
                  }
              }
          }
      }
  
      @Override
      public void remove() {
          currentIterator.remove();
      }
  
  }