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.unsafe;
  
  /**
   * Class to make changes to record length offsets uniform through out
   * various areas of Apache Spark core and unsafe.  The SPARC platform
   * requires this because using a 4 byte Int for record lengths causes
   * the entire record of 8 byte Items to become misaligned by 4 bytes.
   * Using a 8 byte long for record length keeps things 8 byte aligned.
   */
  public class UnsafeAlignedOffset {
  
    private static final int UAO_SIZE = Platform.unaligned() ? 4 : 8;
  
    public static int getUaoSize() {
      return UAO_SIZE;
    }
  
    public static int getSize(Object object, long offset) {
      switch (UAO_SIZE) {
        case 4:
          return Platform.getInt(object, offset);
        case 8:
          return (int)Platform.getLong(object, offset);
        default:
          throw new AssertionError("Illegal UAO_SIZE");
      }
    }
  
    public static void putSize(Object object, long offset, int value) {
      switch (UAO_SIZE) {
        case 4:
          Platform.putInt(object, offset, value);
          break;
        case 8:
          Platform.putLong(object, offset, value);
          break;
        default:
          throw new AssertionError("Illegal UAO_SIZE");
      }
    }
  }
  