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.split;
  
  import org.apache.spark.ml.linalg.Vector;
  
  public class SplitPoint extends SplitEntry {
  
    private float fvalue;
  
    public SplitPoint() {
      this(-1, 0.0f, 0.0f);
    }
  
    public SplitPoint(int fid, float fvalue, float gain) {
      super(fid, gain);
      this.fvalue = fvalue;
    }
  
    @Override
    public int flowTo(float x) {
      return x < fvalue ? 0 : 1;
    }
  
    @Override
    public int flowTo(Vector x) {
      return x.apply(fid) < fvalue ? 0 : 1;
    }
  
    @Override
    public int defaultTo() {
      return fvalue > 0.0f ? 0 : 1;
    }
  
    public float getFvalue() {
      return fvalue;
    }
  
    public void setFvalue(float fvalue) {
      this.fvalue = fvalue;
    }
  
    @Override
    public SplitType splitType() {
      return SplitType.SPLIT_POINT;
    }
  
    @Override
    public String toString() {
      return String.format("%s fid[%d] fvalue[%f] gain[%f]",
          this.splitType(), fid, fvalue, gain);
    }
  }
  