private static void copyMemoryOverlapAddressCheck()

in datasketches-memory-java8/src/main/java/org/apache/datasketches/memory/internal/CompareAndCopy.java [163:177]

• 13 lines of code
• 4 McCabe index (conditional complexity)

  private static void copyMemoryOverlapAddressCheck(final Object srcUnsafeObj, final long srcAdd,
      final Object dstUnsafeObj, final long dstAdd, final long lengthBytes) {
    if (((srcAdd + lengthBytes) <= dstAdd) || ((dstAdd + lengthBytes) <= srcAdd)) {
      copyNonOverlappingMemoryWithChunking(srcUnsafeObj, srcAdd, dstUnsafeObj, dstAdd,
          lengthBytes);
      return;
    }
    if (srcAdd == dstAdd) {
      throw new IllegalArgumentException(
          "Attempt to copy a block of memory exactly in-place, should be a bug");
    }
    // If regions do overlap, fall back to unsafe.copyMemory, tolerating potentially long
    // Time to Safe Point pauses.
    unsafe.copyMemory(srcUnsafeObj, srcAdd, dstUnsafeObj, dstAdd, lengthBytes);
  }