Package org.lmdbjava

Class ByteArrayProxy

java.lang.Object

org.lmdbjava.BufferProxy<byte[]>

org.lmdbjava.ByteArrayProxy

public final class ByteArrayProxy
extends BufferProxy<byte[]>

Byte array proxy. Env.create(org.lmdbjava.BufferProxy).

Field Summary

Fields

Modifier and Type	Field	Description
static BufferProxy<byte[]>	PROXY_BA	The byte array proxy.

Fields inherited from class org.lmdbjava.BufferProxy

MDB_VAL_STRUCT_SIZE, STRUCT_FIELD_OFFSET_DATA, STRUCT_FIELD_OFFSET_SIZE

Method Summary

Modifier and Type	Method	Description
protected byte[]	allocate()	Allocate a new buffer suitable for passing to BufferProxy.out(java.lang.Object, jnr.ffi.Pointer, long).
protected int	compare(byte[] o1, byte[] o2)	Compare the two buffers.
static int	compareArrays(byte[] o1, byte[] o2)	Lexicographically compare two byte arrays.
protected void	deallocate(byte[] buff)	Deallocate a buffer that was previously provided by BufferProxy.allocate().
protected byte[]	getBytes(byte[] buffer)	Obtain a copy of the bytes contained within the passed buffer.
protected void	in(byte[] buffer, int size, jnr.ffi.Pointer ptr, long ptrAddr)	Called when the MDB_val should be set to reflect the passed buffer.
protected void	in(byte[] buffer, jnr.ffi.Pointer ptr, long ptrAddr)	Called when the MDB_val should be set to reflect the passed buffer.
protected byte[]	out(byte[] buffer, jnr.ffi.Pointer ptr, long ptrAddr)	Called when the MDB_val may have changed and the passed buffer should be modified to reflect the new MDB_val.

Methods inherited from class java.lang.Object

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

Field Detail

PROXY_BA

public static final BufferProxy<byte[]> PROXY_BA

The byte array proxy. Guaranteed to never be null.

Method Detail

compareArrays

public static int compareArrays(byte[] o1,
                                byte[] o2)

Lexicographically compare two byte arrays.

Parameters:

o1 - left operand (required)

o2 - right operand (required)

Returns:

as specified by Comparable interface

allocate

protected byte[] allocate()

Description copied from class: BufferProxy

Allocate a new buffer suitable for passing to BufferProxy.out(java.lang.Object, jnr.ffi.Pointer, long).

Specified by:

allocate in class BufferProxy<byte[]>

Returns:

a buffer for passing to the out method

compare

protected int compare(byte[] o1,
                      byte[] o2)

Description copied from class: BufferProxy

Compare the two buffers.

Implemented as a protected method to discourage use of the buffer proxy in collections etc (given by design it wraps a temporary value only).

Specified by:

compare in class BufferProxy<byte[]>

Parameters:

o1 - left operand

o2 - right operand

Returns:

as per Comparable

deallocate

protected void deallocate(byte[] buff)

Description copied from class: BufferProxy

Deallocate a buffer that was previously provided by BufferProxy.allocate().

Specified by:

deallocate in class BufferProxy<byte[]>

Parameters:

buff - the buffer to deallocate (required)

getBytes

protected byte[] getBytes(byte[] buffer)

Description copied from class: BufferProxy

Obtain a copy of the bytes contained within the passed buffer.

Specified by:

getBytes in class BufferProxy<byte[]>

Parameters:

buffer - a non-null buffer created by this proxy instance

Returns:

a copy of the bytes this buffer is currently representing

in

protected void in(byte[] buffer,
                  jnr.ffi.Pointer ptr,
                  long ptrAddr)

Description copied from class: BufferProxy

Called when the MDB_val should be set to reflect the passed buffer. This buffer will have been created by end users, not BufferProxy.allocate().

Specified by:

in in class BufferProxy<byte[]>

Parameters:

buffer - the buffer to write to MDB_val

ptr - the pointer to the MDB_val

ptrAddr - the address of the MDB_val pointer

in

protected void in(byte[] buffer,
                  int size,
                  jnr.ffi.Pointer ptr,
                  long ptrAddr)

Description copied from class: BufferProxy

Called when the MDB_val should be set to reflect the passed buffer.

Specified by:

in in class BufferProxy<byte[]>

Parameters:

buffer - the buffer to write to MDB_val

size - the buffer size to write to MDB_val

ptr - the pointer to the MDB_val

ptrAddr - the address of the MDB_val pointer

out

protected byte[] out(byte[] buffer,
                     jnr.ffi.Pointer ptr,
                     long ptrAddr)

Description copied from class: BufferProxy

Called when the MDB_val may have changed and the passed buffer should be modified to reflect the new MDB_val.

Specified by:

out in class BufferProxy<byte[]>

Parameters:

buffer - the buffer to write to MDB_val

ptr - the pointer to the MDB_val

ptrAddr - the address of the MDB_val pointer

Returns:

the buffer for MDB_val