com.fasterxml.jackson.databind.util

Class ObjectBuffer

java.lang.Object

com.fasterxml.jackson.databind.util.ObjectBuffer

public final class ObjectBuffer
extends Object

Helper class to use for constructing Object arrays by appending entries to create arrays of various lengths (length that is not known a priori).

Constructor Summary

Constructors

Constructor and Description
ObjectBuffer()

Method Summary

Modifier and Type	Method and Description
protected void	_copyTo(Object resultArray, int totalSize, Object[] lastChunk, int lastChunkEntries)
protected void	_reset()
Object[]	appendCompletedChunk(Object[] fullChunk) Method called to add a full Object array as a chunk buffered within this buffer, and to obtain a new array to fill.
int	bufferedSize() Method that can be used to check how many Objects have been buffered within this buffer.
Object[]	completeAndClearBuffer(Object[] lastChunk, int lastChunkEntries) Method called to indicate that the buffering process is now complete; and to construct a combined exactly-sized result array.
<T> T[]	completeAndClearBuffer(Object[] lastChunk, int lastChunkEntries, Class<T> componentType) Type-safe alternative to completeAndClearBuffer(Object[], int), to allow for constructing explicitly typed result array.
void	completeAndClearBuffer(Object[] lastChunk, int lastChunkEntries, List<Object> resultList)
int	initialCapacity() Helper method that can be used to check how much free capacity will this instance start with.
Object[]	resetAndStart() Method called to start buffering process.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectBuffer

public ObjectBuffer()

Method Detail

resetAndStart

public Object[] resetAndStart()

Method called to start buffering process. Will ensure that the buffer is empty, and then return an object array to start chunking content on

appendCompletedChunk

public Object[] appendCompletedChunk(Object[] fullChunk)

Method called to add a full Object array as a chunk buffered within this buffer, and to obtain a new array to fill. Caller is not to use the array it gives; but to use the returned array for continued buffering.

Parameters:

fullChunk - Completed chunk that the caller is requesting to append to this buffer. It is generally chunk that was returned by an earlier call to resetAndStart() or appendCompletedChunk(java.lang.Object[]) (although this is not required or enforced)

Returns:

New chunk buffer for caller to fill

completeAndClearBuffer

public Object[] completeAndClearBuffer(Object[] lastChunk,
                                       int lastChunkEntries)

Method called to indicate that the buffering process is now complete; and to construct a combined exactly-sized result array. Additionally the buffer itself will be reset to reduce memory retention.

Resulting array will be of generic Object[] type: if a typed array is needed, use the method with additional type argument.

completeAndClearBuffer

public <T> T[] completeAndClearBuffer(Object[] lastChunk,
                                      int lastChunkEntries,
                                      Class<T> componentType)

Type-safe alternative to completeAndClearBuffer(Object[], int), to allow for constructing explicitly typed result array.

Parameters:

componentType - Type of elements included in the buffer. Will be used for constructing the result array.

completeAndClearBuffer

public void completeAndClearBuffer(Object[] lastChunk,
                                   int lastChunkEntries,
                                   List<Object> resultList)

initialCapacity

public int initialCapacity()

Helper method that can be used to check how much free capacity will this instance start with. Can be used to choose the best instance to reuse, based on size of reusable object chunk buffer holds reference to.

bufferedSize

public int bufferedSize()

Method that can be used to check how many Objects have been buffered within this buffer.

_reset

protected void _reset()

_copyTo

protected final void _copyTo(Object resultArray,
                             int totalSize,
                             Object[] lastChunk,
                             int lastChunkEntries)