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.tools;
  
  import org.apache.hadoop.fs.FSDataOutputStream;
  
  import java.io.IOException;
  
  /**
   * Model convert interface
   */
  public interface ModelLineConvert {
    /**
     * Serialize row index
     *
     * @param output   output stream
     * @param rowIndex row index
     * @throws IOException
     */
    void convertRowIndex(FSDataOutputStream output, int rowIndex) throws IOException;
  
    /**
     * Serialize a double element
     *
     * @param output output stream
     * @param index  element index
     * @param value  element value
     * @throws IOException
     */
    void convertDouble(FSDataOutputStream output, int index, double value) throws IOException;
  
    /**
     * Serialize a float element
     *
     * @param output output stream
     * @param index  element index
     * @param value  element value
     * @throws IOException
     */
    void convertFloat(FSDataOutputStream output, int index, float value) throws IOException;
  
    /**
     * Serialize a int element
     *
     * @param output output stream
     * @param index  element index
     * @param value  element value
     * @throws IOException
     */
    void convertInt(FSDataOutputStream output, int index, float value) throws IOException;
  
    /**
     * Serialize a double element with longkey
     *
     * @param output output stream
     * @param index  element index
     * @param value  element value
     * @throws IOException
     */
    void convertDoubleLongKey(FSDataOutputStream output, long index, double value) throws IOException;
  }
  