org.apache.arrow.c

Class NativeUtil

java.lang.Object

org.apache.arrow.c.NativeUtil

public final class NativeUtil
extends Object

Utility functions for working with native memory.

Field Summary

Fields

Modifier and Type	Field and Description
static byte	NULL

Method Summary

Modifier and Type	Method and Description
static long	addressOrNull(ArrowBuf buf) Get the address of a buffer or 0 if the input buffer is null.
static long	addressOrNull(BaseStruct struct) Get the address of a C Data Interface struct or 0 if the input struct is null.
static void	closeBuffer(ArrowBuf buf) Close a buffer if it's not null.
static long[]	toJavaArray(long arrayPtr, int size) Convert a native array pointer (void**) to Java array of pointers.
static String	toJavaString(long cstringPtr) Convert a pointer to a null terminated string into a Java String.
static ArrowBuf	toNativeString(BufferAllocator allocator, String string) Convert Java string to a null terminated string.

Methods inherited from class java.lang.Object

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

Field Detail

NULL

public static final byte NULL

See Also:

Constant Field Values

Method Detail

toJavaString

public static String toJavaString(long cstringPtr)

Convert a pointer to a null terminated string into a Java String.

Parameters:

cstringPtr - pointer to C string

Returns:

Converted string

toJavaArray

public static long[] toJavaArray(long arrayPtr,
                                 int size)

Convert a native array pointer (void**) to Java array of pointers.

Parameters:

arrayPtr - Array pointer

size - Array size

Returns:

Array of pointer values as longs

toNativeString

public static ArrowBuf toNativeString(BufferAllocator allocator,
                                      String string)

Convert Java string to a null terminated string.

Parameters:

allocator - Buffer allocator for allocating the native string

string - Input String to convert

Returns:

Buffer with a null terminated string or null if the input is null

closeBuffer

public static void closeBuffer(ArrowBuf buf)

Close a buffer if it's not null.

Parameters:

buf - Buffer to close

addressOrNull

public static long addressOrNull(ArrowBuf buf)

Get the address of a buffer or 0 if the input buffer is null.

Parameters:

buf - Buffer to get the address of

Returns:

Memory address or 0

addressOrNull

public static long addressOrNull(BaseStruct struct)

Get the address of a C Data Interface struct or 0 if the input struct is null.

Parameters:

struct - C Data Interface struct to get the address of

Returns:

Memory address or 0