import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / vector / src / main / java / org / apache / arrow / vector / util / DataSizeRoundingUtil.java

diff --git a/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/util/DataSizeRoundingUtil.java b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/util/DataSizeRoundingUtil.java
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+++ b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/util/DataSizeRoundingUtil.java
@@ -0,0 +1,99 @@
+/*
+ * 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.arrow.vector.util;
+
+/**
+ * Utilities for rounding data size.
+ */
+public final class DataSizeRoundingUtil {
+
+  /**
+   * The mask for rounding an integer to a multiple of 8.
+   * (i.e. clear the lowest 3 bits)
+   */
+  public static int ROUND_8_MASK_INT = 0xFFFFFFF8;
+
+  /**
+   * The mask for rounding a long integer to a multiple of 8.
+   * (i.e. clear the lowest 3 bits)
+   */
+  public static long ROUND_8_MASK_LONG = 0xFFFFFFFFFFFFFFF8L;
+
+  /**
+   * The number of bits to shift for dividing by 8.
+   */
+  public static int DIVIDE_BY_8_SHIFT_BITS = 3;
+
+  /**
+   * Round up the number to the nearest multiple of 8.
+   * @param input the number to round.
+   * @return the rounded number.
+   */
+  public static int roundUpTo8Multiple(int input) {
+    return (input + 7) & ROUND_8_MASK_INT;
+  }
+
+  /**
+   * Round up the number to the nearest multiple of 8.
+   * @param input the number to round.
+   * @return the rounded number
+   */
+  public static long roundUpTo8Multiple(long input) {
+    return (input + 7L) & ROUND_8_MASK_LONG;
+  }
+
+  /**
+   * Round down the number to the nearest multiple of 8.
+   * @param input the number to round.
+   * @return the rounded number.
+   */
+  public static int roundDownTo8Multiple(int input) {
+    return input & ROUND_8_MASK_INT;
+  }
+
+  /**
+   * Round down the number to the nearest multiple of 8.
+   * @param input the number to round.
+   * @return the rounded number
+   */
+  public static long roundDownTo8Multiple(long input) {
+    return input & ROUND_8_MASK_LONG;
+  }
+
+  /**
+   * A fast way to compute Math.ceil(input / 8.0).
+   * @param input the input number.
+   * @return the computed number.
+   */
+  public static int divideBy8Ceil(int input) {
+    return (input + 7) >>> DIVIDE_BY_8_SHIFT_BITS;
+  }
+
+  /**
+   * A fast way to compute Math.ceil(input / 8.0).
+   * @param input the input number.
+   * @return the computed number.
+   */
+  public static long divideBy8Ceil(long input) {
+    return (input + 7) >>> (long) DIVIDE_BY_8_SHIFT_BITS;
+  }
+
+  private DataSizeRoundingUtil() {
+
+  }
+}