content: // Originally copied from netty project, version 4.1.17-Final, heavily modified
  /*
   * 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:
   *
   *   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 org.apache.bookkeeper.common.collections;
  
  import io.netty.util.Recycler.Handle;
  import java.util.ArrayList;
  
  /**
   * A simple list which is recyclable.
   */
  public final class RecyclableArrayList<T> extends ArrayList<T> {
  
      private static final int DEFAULT_INITIAL_CAPACITY = 8;
  
      /**
       * An ArrayList recycler.
       */
      public static class Recycler<X>
          extends io.netty.util.Recycler<RecyclableArrayList<X>> {
          @Override
          protected RecyclableArrayList<X> newObject(
                  Handle<RecyclableArrayList<X>> handle) {
              return new RecyclableArrayList<X>(handle, DEFAULT_INITIAL_CAPACITY);
          }
  
          public RecyclableArrayList<X> newInstance() {
              return get();
          }
      }
  
      private final Handle<RecyclableArrayList<T>> handle;
  
      /**
       * Default non-pooled instance.
       */
      public RecyclableArrayList() {
          super();
          this.handle = null;
      }
  
      private RecyclableArrayList(Handle<RecyclableArrayList<T>> handle, int initialCapacity) {
          super(initialCapacity);
          this.handle = handle;
      }
  
      public void recycle() {
          clear();
          if (handle != null) {
              handle.recycle(this);
          }
      }
  
      @Override
      public boolean equals(Object obj) {
          return super.equals(obj);
      }
  
      @Override
      public int hashCode() {
          return super.hashCode();
      }
  
  }
  