com.sun.pdfview.decode
Class Predictor

java.lang.Object
  extended by com.sun.pdfview.decode.Predictor
Direct Known Subclasses:
PNGPredictor, TIFFPredictor

public abstract class Predictor
extends java.lang.Object

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


Field Summary
static int PNG
           
static int TIFF
          well known algorithms
 
Constructor Summary
protected Predictor(int algorithm)
          Create an instance of a predictor.
 
Method Summary
 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  java.nio.ByteBuffer unpredict(java.nio.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 java.nio.ByteBuffer unpredict(java.nio.ByteBuffer imageData)
                                       throws java.io.IOException
Actually perform this algorithm on decoded image data. Subclasses must implement this method

Throws:
java.io.IOException

getPredictor

public static Predictor getPredictor(PDFObject params)
                              throws java.io.IOException
Get an instance of a predictor

Parameters:
params - the filter parameters
Throws:
java.io.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