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   /*
    * Copyright 2019 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.handler.codec.http2;
  
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.Queue;
  
  final class MaxCapacityQueue<E> implements Queue<E> {
      private final Queue<E> queue;
      private final int maxCapacity;
  
      MaxCapacityQueue(Queue<E> queue, int maxCapacity) {
          this.queue = queue;
          this.maxCapacity = maxCapacity;
      }
  
      @Override
      public boolean add(E element) {
          if (offer(element)) {
              return true;
          }
          throw new IllegalStateException();
      }
  
      @Override
      public boolean offer(E element) {
          if (maxCapacity <= queue.size()) {
              return false;
          }
          return queue.offer(element);
      }
  
      @Override
      public E remove() {
          return queue.remove();
      }
  
      @Override
      public E poll() {
          return queue.poll();
      }
  
      @Override
      public E element() {
          return queue.element();
      }
  
      @Override
      public E peek() {
          return queue.peek();
      }
  
      @Override
      public int size() {
          return queue.size();
      }
  
      @Override
      public boolean isEmpty() {
          return queue.isEmpty();
      }
  
      @Override
      public boolean contains(Object o) {
          return queue.contains(o);
      }
  
      @Override
      public Iterator<E> iterator() {
          return queue.iterator();
      }
  
      @Override
      public Object[] toArray() {
          return queue.toArray();
      }
  
      @Override
      public <T> T[] toArray(T[] a) {
          return queue.toArray(a);
      }
  
      @Override
      public boolean remove(Object o) {
          return queue.remove(o);
     }
 
     @Override
     public boolean containsAll(Collection<?> c) {
         return queue.containsAll(c);
     }
 
     @Override
     public boolean addAll(Collection<? extends E> c) {
         if (maxCapacity >= size() + c.size()) {
             return queue.addAll(c);
         }
         throw new IllegalStateException();
     }
 
     @Override
     public boolean removeAll(Collection<?> c) {
         return queue.removeAll(c);
     }
 
     @Override
     public boolean retainAll(Collection<?> c) {
         return queue.retainAll(c);
     }
 
     @Override
     public void clear() {
         queue.clear();
     }
 }