content: /*
   * 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.spark.sql.catalyst.expressions;
  
  import org.apache.spark.unsafe.Platform;
  
  /**
   * Simulates Hive's hashing function at
   * org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils#hashcode()
   */
  public class HiveHasher {
  
    @Override
    public String toString() {
      return HiveHasher.class.getSimpleName();
    }
  
    public static int hashInt(int input) {
      return input;
    }
  
    public static int hashLong(long input) {
      return (int) ((input >>> 32) ^ input);
    }
  
    public static int hashUnsafeBytes(Object base, long offset, int lengthInBytes) {
      assert (lengthInBytes >= 0): "lengthInBytes cannot be negative";
      int result = 0;
      for (int i = 0; i < lengthInBytes; i++) {
        result = (result * 31) + (int) Platform.getByte(base, offset + i);
      }
      return result;
    }
  }
  