Package org.rocksdb

Class DirectSlice

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.RocksMutableObject

org.rocksdb.AbstractSlice<java.nio.ByteBuffer>

org.rocksdb.DirectSlice

All Implemented Interfaces:

java.lang.AutoCloseable

public class DirectSlice
extends AbstractSlice<java.nio.ByteBuffer>

Base class for slices which will receive direct ByteBuffer based access to the underlying data. ByteBuffer backed slices typically perform better with larger keys and values. When using smaller keys and values consider using @see org.rocksdb.Slice

Field Summary

Fields

Modifier and Type	Field	Description
static DirectSlice	NONE

Constructor Summary

Constructors

Constructor	Description
DirectSlice(java.lang.String str)	Constructs a slice where the data is taken from a String.
DirectSlice(java.nio.ByteBuffer data)	Constructs a slice where the data is read from the provided ByteBuffer
DirectSlice(java.nio.ByteBuffer data, int length)	Constructs a slice where the data is read from the provided ByteBuffer up to a certain length

Method Summary

Modifier and Type	Method	Description
void	clear()	Clears the backing slice
protected java.nio.ByteBuffer	data0(long handle)	Access to the data is provided by the subtype as it needs to handle the generic typing.
protected void	disposeInternal()
byte	get(int offset)	Retrieves the byte at a specific offset from the underlying data
void	removePrefix(int n)	Drops the specified n number of bytes from the start of the backing slice
void	setLength(int n)

Methods inherited from class org.rocksdb.AbstractSlice

compare, createNewSliceFromString, data, disposeInternal, empty, equals, hashCode, size, startsWith, toString, toString

Methods inherited from class org.rocksdb.RocksMutableObject

close, getNativeHandle, isOwningHandle, resetNativeHandle, setNativeHandle

Methods inherited from class org.rocksdb.AbstractNativeReference

dispose, finalize

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, wait, wait, wait

Field Detail

NONE

public static final DirectSlice NONE

Constructor Detail

DirectSlice

public DirectSlice(java.lang.String str)

Constructs a slice where the data is taken from a String.

Parameters:

str - The string

DirectSlice

public DirectSlice(java.nio.ByteBuffer data,
                   int length)

Constructs a slice where the data is read from the provided ByteBuffer up to a certain length

Parameters:

data - The buffer containing the data

length - The length of the data to use for the slice

DirectSlice

public DirectSlice(java.nio.ByteBuffer data)

Constructs a slice where the data is read from the provided ByteBuffer

Parameters:

data - The bugger containing the data

Method Detail

get

public byte get(int offset)

Retrieves the byte at a specific offset from the underlying data

Parameters:

offset - The (zero-based) offset of the byte to retrieve

Returns:

the requested byte

clear

public void clear()

Description copied from class: AbstractSlice

Clears the backing slice

Specified by:

clear in class AbstractSlice<java.nio.ByteBuffer>

removePrefix

public void removePrefix(int n)

Description copied from class: AbstractSlice

Drops the specified n number of bytes from the start of the backing slice

Specified by:

removePrefix in class AbstractSlice<java.nio.ByteBuffer>

Parameters:

n - The number of bytes to drop

setLength

public void setLength(int n)

disposeInternal

protected void disposeInternal()

Overrides:

disposeInternal in class RocksMutableObject

data0

protected final java.nio.ByteBuffer data0(long handle)

Description copied from class: AbstractSlice

Access to the data is provided by the subtype as it needs to handle the generic typing.

Specified by:

data0 in class AbstractSlice<java.nio.ByteBuffer>

Parameters:

handle - The address of the underlying native object.

Returns:

Java typed access to the data.