com.etymon.pjx.stream
Class PdfEncodeStream

java.lang.Object
  com.etymon.pjx.stream.PdfEncodeStream

public class PdfEncodeStream
extends java.lang.Object

Provides commonly used stream encoding functions. This class is synchronized.

Field Summary

protected java.util.Set	_compressionFilters The set of stream filters used for compression.
protected PdfFlateFilter	_flateFilter
protected PdfManager	_m The manager associated with the PDF document.
protected static PdfName	PDFNAME_CCITTFAXDECODE
protected static PdfName	PDFNAME_DCTDECODE
protected static PdfName	PDFNAME_FILTER
protected static PdfName	PDFNAME_FLATEDECODE
protected static PdfName	PDFNAME_JBIG2DECODE
protected static PdfName	PDFNAME_LZWDECODE
protected static PdfName	PDFNAME_RUNLENGTHDECODE

Constructor Summary

PdfEncodeStream(PdfManager manager)
Constructs an instance of this class with a specified manager.

Method Summary

PdfStream

compressFlate(PdfStream stream) Encodes a stream using the Flate compression method (based on zlib/deflate).

Methods inherited from class java.lang.Object

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

Field Detail

PDFNAME_FILTER

protected static final PdfName PDFNAME_FILTER

PDFNAME_FLATEDECODE

protected static final PdfName PDFNAME_FLATEDECODE

PDFNAME_LZWDECODE

protected static final PdfName PDFNAME_LZWDECODE

PDFNAME_RUNLENGTHDECODE

protected static final PdfName PDFNAME_RUNLENGTHDECODE

PDFNAME_CCITTFAXDECODE

protected static final PdfName PDFNAME_CCITTFAXDECODE

PDFNAME_JBIG2DECODE

protected static final PdfName PDFNAME_JBIG2DECODE

PDFNAME_DCTDECODE

protected static final PdfName PDFNAME_DCTDECODE

_compressionFilters

protected java.util.Set _compressionFilters

The set of stream filters used for compression.

_flateFilter

protected PdfFlateFilter _flateFilter

_m

protected PdfManager _m

The manager associated with the PDF document.

Constructor Detail

PdfEncodeStream

public PdfEncodeStream(PdfManager manager)

Constructs an instance of this class with a specified manager.

Parameters:

manager - the manager instance.

Method Detail

compressFlate

public PdfStream compressFlate(PdfStream stream)
                        throws java.io.IOException,
                               PdfFormatException

Encodes a stream using the Flate compression method (based on zlib/deflate). If the stream is already compressed with the Flate, LZW, RunLength, CCITTFax, JBIG2, or DCT method, then this method returns the original stream unmodified. This method uses PdfFlateFilter.encode(PdfStream) to perform the encoding.

Parameters:

stream - the stream to encode.

Returns:

the encoded stream, or the original stream if it is already compressed.

Throws:

java.io.IOException

PdfFormatException