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   /*
    * Copyright 2013 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.util.internal;
  
  import java.util.Iterator;
  
  public final class ReadOnlyIterator<T> implements Iterator<T> {
      private final Iterator<? extends T> iterator;
  
      public ReadOnlyIterator(Iterator<? extends T> iterator) {
          this.iterator = ObjectUtil.checkNotNull(iterator, "iterator");
      }
  
      @Override
      public boolean hasNext() {
          return iterator.hasNext();
      }
  
      @Override
      public T next() {
          return iterator.next();
      }
  
      @Override
      public void remove() {
          throw new UnsupportedOperationException("read-only");
      }
  }