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.spark.ml.tree.basic;
  
  import com.tencent.angel.spark.ml.tree.param.TreeParam;
  import java.io.Serializable;
  import java.util.Map;
  import java.util.TreeMap;
  
  public abstract class Tree<TParam extends TreeParam, Node extends TNode> implements Serializable {
  
    protected final TParam param;
    protected Map<Integer, Node> nodes; // nodes in the tree
  
    public Tree(TParam param) {
      this.param = param;
      this.nodes = new TreeMap<>();
    }
  
    public TParam getParam() {
      return this.param;
    }
  
    public Node getRoot() {
      return this.nodes.get(0);
    }
  
    public Node getNode(int nid) {
      return this.nodes.get(nid);
    }
  
    public void setNode(int nid, Node node) {
      this.nodes.put(nid, node);
    }
  
    public Map<Integer, Node> getNodes() {
      return this.nodes;
    }
  
    public int size() {
      return nodes.size();
    }
  
  }
  