Package org.apache.arrow.memory.util

Class ArrowBufPointer

java.lang.Object

org.apache.arrow.memory.util.ArrowBufPointer

public final class ArrowBufPointer
extends Object

Pointer to a memory region within an ArrowBuf. It will be used as the basis for calculating hash code within a vector, and equality determination.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	NULL_HASH_CODE	The hash code when the arrow buffer is null.

Constructor Summary

Constructors

Constructor	Description
ArrowBufPointer()	The default constructor.
ArrowBufPointer(ArrowBuf buf, long offset, long length)	Constructs an Arrow buffer pointer.
ArrowBufPointer(ArrowBuf buf, long offset, long length, ArrowBufHasher hasher)	Constructs an Arrow buffer pointer.
ArrowBufPointer(ArrowBufHasher hasher)	Constructs an arrow buffer pointer with the specified hasher.

Method Summary

Modifier and Type	Method	Description
int	compareTo(ArrowBufPointer that)	Compare two arrow buffer pointers.
boolean	equals(@Nullable Object o)
@Nullable ArrowBuf	getBuf()	Gets the underlying buffer, or null if the underlying data is invalid or null.
long	getLength()
long	getOffset()
int	hashCode()
void	set(ArrowBuf buf, long offset, long length)	Sets this pointer.

Methods inherited from class java.lang.Object

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

Field Details

NULL_HASH_CODE

public static final int NULL_HASH_CODE

The hash code when the arrow buffer is null.

See Also:

• Constant Field Values

Constructor Details

ArrowBufPointer

public ArrowBufPointer()

The default constructor.

ArrowBufPointer

public ArrowBufPointer(ArrowBufHasher hasher)

Constructs an arrow buffer pointer with the specified hasher.

Parameters:

hasher - the hasher to use.

ArrowBufPointer

public ArrowBufPointer(ArrowBuf buf,
 long offset,
 long length)

Constructs an Arrow buffer pointer.

Parameters:

buf - the underlying ArrowBuf, which can be null.

offset - the start off set of the memory region pointed to.

length - the length off set of the memory region pointed to.

ArrowBufPointer

public ArrowBufPointer(ArrowBuf buf,
 long offset,
 long length,
 ArrowBufHasher hasher)

Constructs an Arrow buffer pointer.

Parameters:

buf - the underlying ArrowBuf, which can be null.

offset - the start off set of the memory region pointed to.

length - the length off set of the memory region pointed to.

hasher - the hasher used to calculate the hash code.

Method Details

set

public void set(ArrowBuf buf,
 long offset,
 long length)

Sets this pointer.

Parameters:

buf - the underlying ArrowBuf, which can be null.

offset - the start off set of the memory region pointed to.

length - the length off set of the memory region pointed to.

getBuf

public @Nullable ArrowBuf getBuf()

Gets the underlying buffer, or null if the underlying data is invalid or null.

Returns:

the underlying buffer, if any, or null if the underlying data is invalid or null.

getOffset

public long getOffset()

getLength

public long getLength()

equals

public boolean equals(@Nullable Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareTo

public int compareTo(ArrowBufPointer that)

Compare two arrow buffer pointers. The comparison is based on lexicographic order.

Parameters:

that - the other pointer to compare.

Returns:

0 if the two pointers are equal; a positive integer if this pointer is larger; a negative integer if this pointer is smaller.