content: /*
   * Copyright 2021 Alibaba Group Holding Limited.
   *
   * Licensed 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 com.alibaba.graphscope.parallel.mm;
  
  import org.apache.hadoop.io.Writable;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  public class ListMessageIterable<MSG_T extends Writable> implements MessageIterable<MSG_T> {
  
      public static int DEFAULT_MESSAGE_ITERABLE_SIZE = 4;
  
      private List<MSG_T> msgs;
  
      public ListMessageIterable() {
          msgs = new ArrayList<MSG_T>(DEFAULT_MESSAGE_ITERABLE_SIZE);
      }
  
      /**
       * Returns an iterator over elements of type {@code T}.
       *
       * @return an Iterator.
       */
      @Override
      public Iterator<MSG_T> iterator() {
          return msgs.iterator();
      }
  
      public void append(MSG_T msg) {
          msgs.add(msg);
      }
  
      public void clear() {
          msgs.clear();
      }
  
      public int size() {
          return msgs.size();
      }
  }
  