/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.shardingsphere.infra.metadata.statistics;
  
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import lombok.SneakyThrows;
  
  import java.math.BigInteger;
  import java.nio.charset.StandardCharsets;
  import java.security.MessageDigest;
  import java.util.List;
  
  /**
   * ShardingSphere row data.
   */
  @RequiredArgsConstructor
  @Getter
  @EqualsAndHashCode(onlyExplicitlyIncluded = true)
  public final class ShardingSphereRowData {
      
      @EqualsAndHashCode.Include
      private final String uniqueKey;
      
      private final List<Object> rows;
      
      public ShardingSphereRowData(final List<Object> rows) {
          uniqueKey = generateUniqueKey(rows);
          this.rows = rows;
      }
      
      private String generateUniqueKey(final List<Object> rows) {
          StringBuilder uniqueKeyText = new StringBuilder();
          for (Object each : rows) {
              if (null == each) {
                  uniqueKeyText.append('|');
              } else {
                  uniqueKeyText.append(each).append('|');
              }
          }
          return useMd5GenerateUniqueKey(uniqueKeyText);
      }
      
      @SneakyThrows
      private String useMd5GenerateUniqueKey(final StringBuilder uniqueKeyText) {
          MessageDigest md5 = MessageDigest.getInstance("MD5");
          md5.update(StandardCharsets.UTF_8.encode(uniqueKeyText.toString()));
          return String.format("%032x", new BigInteger(1, md5.digest()));
      }
  }