import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / memory / memory-core / src / main / java / org / apache / arrow / memory / util / LargeMemoryUtil.java

diff --git a/ceph/src/arrow/java/memory/memory-core/src/main/java/org/apache/arrow/memory/util/LargeMemoryUtil.java b/ceph/src/arrow/java/memory/memory-core/src/main/java/org/apache/arrow/memory/util/LargeMemoryUtil.java
new file mode 100644 (file)
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--- /dev/null
+++ b/ceph/src/arrow/java/memory/memory-core/src/main/java/org/apache/arrow/memory/util/LargeMemoryUtil.java
@@ -0,0 +1,44 @@
+/*
+ * 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.memory.util;
+
+import org.apache.arrow.memory.BoundsChecking;
+
+/** Contains utilities for dealing with a 64-bit address base. */
+public final class LargeMemoryUtil {
+
+  private LargeMemoryUtil() {}
+
+  /**
+   * Casts length to an int, but raises an exception the value is outside
+   * the range of an int.
+   */
+  public static int checkedCastToInt(long length) {
+    if (BoundsChecking.BOUNDS_CHECKING_ENABLED) {
+      return Math.toIntExact(length);
+    }
+    return (int) length;
+  }
+
+  /**
+   * Returns a min(Integer.MAX_VALUE, length).
+   */
+  public static int capAtMaxInt(long length) {
+    return (int) Math.min(length, Integer.MAX_VALUE);
+  }
+}