com.sun.pdfview.decode

Class Predictor

java.lang.Object

com.sun.pdfview.decode.Predictor

Direct Known Subclasses:

PNGPredictor

public abstract class Predictor
extends Object

The abstract superclass of various predictor objects that undo well-known prediction algorithms.

Field Summary

Fields

Modifier and Type	Field and Description
static int	PNG
static int	TIFF well known algorithms

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Predictor(int algorithm) Create an instance of a predictor.

Method Summary

Modifier and Type	Method and Description
int	getAlgorithm() Get the algorithm in use
int	getBitsPerComponent() Get the number of bits per color component
int	getColors() Get the number of colors per sample
int	getColumns() Get the number of columns
static Predictor	getPredictor(PDFObject params) Get an instance of a predictor
void	setBitsPerComponent(int bpc) Set the number of bits per color component
protected void	setColors(int colors) Set the number of colors per sample
void	setColumns(int columns) Set the number of columns
abstract ByteBuffer	unpredict(ByteBuffer imageData) Actually perform this algorithm on decoded image data.

Methods inherited from class java.lang.Object

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

Field Detail

TIFF

public static final int TIFF

well known algorithms

See Also:

Constant Field Values

PNG

public static final int PNG

See Also:

Constant Field Values

Constructor Detail

Predictor

protected Predictor(int algorithm)

Create an instance of a predictor. Use getPredictor() instead of this.

Method Detail

unpredict

public abstract ByteBuffer unpredict(ByteBuffer imageData)
                              throws IOException

Actually perform this algorithm on decoded image data. Subclasses must implement this method

Throws:

IOException

getPredictor

public static Predictor getPredictor(PDFObject params)
                              throws IOException

Get an instance of a predictor

Parameters:

params - the filter parameters

Throws:

IOException

getAlgorithm

public int getAlgorithm()

Get the algorithm in use

Returns:

one of the known algorithm types

getColors

public int getColors()

Get the number of colors per sample

setColors

protected void setColors(int colors)

Set the number of colors per sample

getBitsPerComponent

public int getBitsPerComponent()

Get the number of bits per color component

setBitsPerComponent

public void setBitsPerComponent(int bpc)

Set the number of bits per color component

getColumns

public int getColumns()

Get the number of columns

setColumns

public void setColumns(int columns)

Set the number of columns