gnu.jpdf
Class PDFOutput

java.lang.Object
  gnu.jpdf.PDFOutput

public class PDFOutput
extends java.lang.Object

This class is used to write a PDF document. It acts as a wrapper to a real OutputStream, but is necessary for certain internal PDF structures to be built correctly.

Field Summary

protected java.io.ByteArrayOutputStream	baos This is the OutputStream used to write each object to.
protected PDFObject	infoID This is used to track the /Info object (info)
protected int	offset This is the current position within the stream
protected java.util.Vector	offsets This vector contains offsets of each object
protected java.io.OutputStream	os This is the actual OutputStream used to write to.
protected PDFObject	rootID This is used to track the /Root object (catalog)

Constructor Summary

PDFOutput(java.io.OutputStream os)
This creates a PDF OutputStream

Method Summary

protected void	close() This closes the Stream, writing the xref table
protected void	write(PDFObject ob) This method writes a PDFObject to the stream.
protected void	writeblock(int firstid, java.util.Vector block) Writes a block of references to the PDF file

Methods inherited from class java.lang.Object

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

Field Detail

os

protected java.io.OutputStream os

This is the actual OutputStream used to write to.

baos

protected java.io.ByteArrayOutputStream baos

This is the OutputStream used to write each object to.

We use a separate stream, because we need to keep track of how many bytes have been written for each object for the xref table to work correctly.

offset

protected int offset

This is the current position within the stream

offsets

protected java.util.Vector offsets

This vector contains offsets of each object

rootID

protected PDFObject rootID

This is used to track the /Root object (catalog)

infoID

protected PDFObject infoID

This is used to track the /Info object (info)

Constructor Detail

PDFOutput

public PDFOutput(java.io.OutputStream os)
          throws java.io.IOException

This creates a PDF OutputStream

Parameters:

os - The output stream to write the PDF file to.

Throws:

java.io.IOException

Method Detail

write

protected void write(PDFObject ob)
              throws java.io.IOException

This method writes a PDFObject to the stream.

Parameters:

ob - PDFObject Obeject to write

Throws:

java.io.IOException - on error

close

protected void close()
              throws java.io.IOException

This closes the Stream, writing the xref table

Throws:

java.io.IOException

writeblock

protected void writeblock(int firstid,
                          java.util.Vector block)
                   throws java.io.IOException

Writes a block of references to the PDF file

Parameters:

firstid - ID of the first reference in this block

block - Vector containing the references in this block

Throws:

java.io.IOException - on write error