com.itextpdf.kernel.pdf

Class ASCIIHexCompressionStrategy

java.lang.Object

com.itextpdf.kernel.pdf.ASCIIHexCompressionStrategy

All Implemented Interfaces:

IStreamCompressionStrategy

public class ASCIIHexCompressionStrategy
extends Object
implements IStreamCompressionStrategy

A compression strategy that uses the ASCIIHexDecode filter for PDF streams.

This strategy implements the IStreamCompressionStrategy interface and provides ASCIIHexDecode encoding.

The strategy ensures, that streams are saved using just 7-bit ASCII characters, but it doubles the sizes of streams compared to just saving them as-is. So calling this a "compression strategy" is a misnomer.

Constructor Summary

Constructors

Constructor and Description
ASCIIHexCompressionStrategy() Constructs a new ASCIIHexCompressionStrategy instance.

Method Summary

Modifier and Type	Method and Description
OutputStream	createNewOutputStream(OutputStream original, PdfStream stream) Creates a new output stream with ASCIIHex compression applied.
PdfObject	getDecodeParams() Returns the decode parameters for the ASCIIHexDecode filter.
PdfName	getFilterName() Returns the name of the compression filter.

Methods inherited from class java.lang.Object

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

Constructor Detail

ASCIIHexCompressionStrategy

public ASCIIHexCompressionStrategy()

Constructs a new ASCIIHexCompressionStrategy instance.

Method Detail

getFilterName

public PdfName getFilterName()

Returns the name of the compression filter.

Specified by:

getFilterName in interface IStreamCompressionStrategy

Returns:

PdfName.ASCIIHexDecode representing the ASCIIHexDecode filter

getDecodeParams

public PdfObject getDecodeParams()

Returns the decode parameters for the ASCIIHexDecode filter.

This implementation returns null as no special decode parameters are required for standard ASCIIHex compression.

Specified by:

getDecodeParams in interface IStreamCompressionStrategy

Returns:

null as no decode parameters are needed

createNewOutputStream

public OutputStream createNewOutputStream(OutputStream original,
                                          PdfStream stream)

Creates a new output stream with ASCIIHex compression applied.

This method wraps the original output stream in a ASCIIHexOutputStream that applies ASCIIHex compression.

Specified by:

createNewOutputStream in interface IStreamCompressionStrategy

Parameters:

original - the original output stream to wrap

stream - the PDF stream containing compression configuration

Returns:

a new ASCIIHexOutputStream that compresses data using the ASCIIHex algorithm