content: /*
   * Tencent is pleased to support the open source community by making Angel available.
   *
   * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
   *
   * 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
   *
   * https://opensource.org/licenses/Apache-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.tencent.angel.graph.client.node2vec.utils;
  
  import it.unimi.dsi.fastutil.longs.Long2IntOpenHashMap;
  import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
  import java.util.List;
  
  public class Merge {
  
    public static <E> Long2ObjectOpenHashMap<E> mergeHadhMap(Long2ObjectOpenHashMap<E> m1,
        Long2ObjectOpenHashMap<E> m2) {
      int size = m1.size() + m2.size();
  
      Long2ObjectOpenHashMap<E> result = new Long2ObjectOpenHashMap<>(size);
      result.putAll(m1);
      result.putAll(m2);
  
      return result;
    }
  
    public static <E> Long2ObjectOpenHashMap<E> mergeHadhMap(List<Long2ObjectOpenHashMap<E>> ms) {
      int size = 0;
  
      for (Long2ObjectOpenHashMap<E> m : ms) {
        if (m != null) {
          size += m.size();
        }
      }
  
      Long2ObjectOpenHashMap<E> result = new Long2ObjectOpenHashMap<>(size);
      for (Long2ObjectOpenHashMap<E> m : ms) {
        if (m != null) {
          result.putAll(m);
        }
      }
  
      return result;
    }
  
    public static <E> Long2IntOpenHashMap mergeHashMap(List<Long2IntOpenHashMap> ms) {
      int size = 0;
  
      for (Long2IntOpenHashMap m : ms) {
        if (m != null) {
          size += m.size();
        }
      }
  
      Long2IntOpenHashMap result = new Long2IntOpenHashMap(size);
      for (Long2IntOpenHashMap m : ms) {
        if (m != null) {
          result.putAll(m);
        }
      }
  
      return result;
    }
  }
  