Module org.apache.arrow.memory.core

Package org.apache.arrow.memory.util

Class MemoryUtil

java.lang.Object

org.apache.arrow.memory.util.MemoryUtil

public class MemoryUtil
extends Object

Utilities for memory related operations.

Field Summary

Fields

Modifier and Type	Field	Description
static final boolean	LITTLE_ENDIAN	If the native byte order is little-endian.

Method Summary

Modifier and Type	Method	Description
static long	allocateMemory(long bytes)
static void	copyFromMemory(long srcAddress, byte[] dest, long destIndex, long bytes)
static void	copyMemory(long srcAddress, long destAddress, long bytes)
static void	copyToMemory(byte[] src, long srcIndex, long destAddress, long bytes)
static ByteBuffer	directBuffer(long address, int capacity)	Create nio byte buffer.
static void	freeMemory(long address)
static byte	getByte(long address)
static long	getByteBufferAddress(ByteBuffer buf)	Given a ByteBuffer, gets the address the underlying memory space.
static int	getInt(byte[] bytes, int index)
static int	getInt(long address)
static long	getLong(byte[] bytes, int index)
static long	getLong(long address)
static short	getShort(long address)
static void	putByte(long address, byte value)
static void	putInt(long address, int value)
static void	putLong(long address, long value)
static void	putShort(long address, short value)
static void	setMemory(long address, long bytes, byte value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

LITTLE_ENDIAN

public static final boolean LITTLE_ENDIAN

If the native byte order is little-endian.

Method Details

getByteBufferAddress

public static long getByteBufferAddress(ByteBuffer buf)

Given a ByteBuffer, gets the address the underlying memory space.

Parameters:

buf - the byte buffer.

Returns:

address of the underlying memory.

directBuffer

public static ByteBuffer directBuffer(long address,
 int capacity)

Create nio byte buffer.

copyMemory

public static void copyMemory(long srcAddress,
 long destAddress,
 long bytes)

copyToMemory

public static void copyToMemory(byte[] src,
 long srcIndex,
 long destAddress,
 long bytes)

copyFromMemory

public static void copyFromMemory(long srcAddress,
 byte[] dest,
 long destIndex,
 long bytes)

getByte

public static byte getByte(long address)

putByte

public static void putByte(long address,
 byte value)

getShort

public static short getShort(long address)

putShort

public static void putShort(long address,
 short value)

getInt

public static int getInt(long address)

putInt

public static void putInt(long address,
 int value)

getLong

public static long getLong(long address)

putLong

public static void putLong(long address,
 long value)

setMemory

public static void setMemory(long address,
 long bytes,
 byte value)

getInt

public static int getInt(byte[] bytes,
 int index)

getLong

public static long getLong(byte[] bytes,
 int index)

allocateMemory

public static long allocateMemory(long bytes)

freeMemory

public static void freeMemory(long address)