org.openjdk.jmc.flightrecorder.internal.parser

Class Chunk

java.lang.Object

org.openjdk.jmc.flightrecorder.internal.parser.Chunk

public class Chunk
extends java.lang.Object

Class for handling data belonging to a single chunk.

Field Summary

Fields

Modifier and Type	Field and Description
private byte[]	data
private java.io.DataInput	input
private short	majorVersion
private short	minorVersion
private int	position

Constructor Summary

Constructors

Constructor and Description
Chunk(java.io.DataInput input, int offset, byte[] reusableBuffer)

Method Summary

Modifier and Type	Method and Description
byte[]	fill(long upToPosition) Copy data from the input source to the chunk buffer.
private static int	getArrayPosition(long pos)
short	getMajorVersion()
short	getMinorVersion()
int	getPosition()
byte[]	getReusableBuffer() Return the current data buffer.
void	skip(long upToPosition) Skip reading data from the input source up to a specified position.

Methods inherited from class java.lang.Object

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

Field Detail

input

private final java.io.DataInput input

majorVersion

private final short majorVersion

minorVersion

private final short minorVersion

position

private int position

data

private byte[] data

Constructor Detail

Chunk

public Chunk(java.io.DataInput input,
             int offset,
             byte[] reusableBuffer)
      throws java.io.IOException,
             InvalidJfrFileException

Parameters:

input - input to read chunk data from

offset - initial position

reusableBuffer - a byte array for holding read chunk data

Throws:

java.io.IOException

InvalidJfrFileException

Method Detail

getMajorVersion

public short getMajorVersion()

getMinorVersion

public short getMinorVersion()

getPosition

public int getPosition()

fill

public byte[] fill(long upToPosition)
            throws java.io.IOException,
                   InvalidJfrFileException

Copy data from the input source to the chunk buffer. Note that this may replace the buffer if it is not large enough.

Parameters:

upToPosition - position to fill buffer to

Returns:

the current buffer for the chunk data

Throws:

java.io.IOException

InvalidJfrFileException

skip

public void skip(long upToPosition)
          throws java.io.IOException,
                 InvalidJfrFileException

Skip reading data from the input source up to a specified position. Note that the skipped data can not be read later from the same input source.

Parameters:

upToPosition - chunk relative position

Throws:

java.io.IOException

InvalidJfrFileException

getReusableBuffer

public byte[] getReusableBuffer()

Return the current data buffer. Note that the returned array is only guaranteed to contain data up to the read position when this method is called. If the buffer is filled more later, then that data may end up in a new array.

Returns:

the current chunk data buffer

getArrayPosition

private static int getArrayPosition(long pos)
                             throws InvalidJfrFileException

Throws:

InvalidJfrFileException