org.apache.pdfbox.pdfwriter

Class COSWriter

java.lang.Object

org.apache.pdfbox.pdfwriter.COSWriter

All Implemented Interfaces:

Closeable, AutoCloseable, ICOSVisitor

public class COSWriter
extends Object
implements ICOSVisitor, Closeable

this class acts on a in-memory representation of a pdf document. todo no support for incremental updates todo single xref section only todo no linearization

Author:

Michael Traut, Ben Litchfield

Field Summary

Fields

Modifier and Type	Field and Description
static byte[]	ARRAY_CLOSE The array close token.
static byte[]	ARRAY_OPEN The array open token.
static byte[]	COMMENT The start to a PDF comment.
static byte[]	DICT_CLOSE The dictionary close token.
static byte[]	DICT_OPEN The dictionary open token.
static byte[]	ENDOBJ The end object token.
static byte[]	ENDSTREAM The close stream token.
static byte[]	EOF The EOF constant.
static byte[]	GARBAGE Garbage bytes used to create the PDF header.
static byte[]	OBJ The starting object token.
static byte[]	REFERENCE The reference token.
static byte[]	SPACE space character.
static byte[]	STARTXREF The start xref token.
static byte[]	STREAM The open stream token.
static byte[]	TRAILER The trailer token.
static byte[]	VERSION The output version of the PDF.
static byte[]	XREF The XREF token.
static byte[]	XREF_FREE The xref free token.
static byte[]	XREF_USED The xref used token.

Constructor Summary

Constructors

Constructor and Description
COSWriter(OutputStream os) COSWriter constructor comment.
COSWriter(OutputStream os, InputStream is) COSWriter constructor for incremental updates.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addXRefEntry(COSWriterXRefEntry entry) add an entry in the x ref table for later dump.
void	close() This will close the stream.
protected void	doWriteBody(COSDocument doc) This will write the body of the document.
protected void	doWriteHeader(COSDocument doc) This will write the header to the PDF document.
void	doWriteObject(COSBase obj) This will write a COS object.
protected void	doWriteTrailer(COSDocument doc) This will write the trailer to the PDF document.
protected void	doWriteXRef(COSDocument doc) write the x ref section for the pdf file currently, the pdf is reconstructed from the scratch, so we write a single section todo support for incremental writing?
protected long	getNumber() This will get the current object number.
Map<COSBase,COSObjectKey>	getObjectKeys() This will get all available object keys.
protected OutputStream	getOutput() This will get the output stream.
protected COSStandardOutputStream	getStandardOutput() This will get the standard output stream.
protected long	getStartxref() This will get the current start xref.
protected List<COSWriterXRefEntry>	getXRefEntries() This will get the xref entries.
protected Integer[]	getXRefRanges(List<COSWriterXRefEntry> xRefEntriesList) check the xref entries and write out the ranges.
protected void	setNumber(long newNumber) This will set the current object number.
protected void	setStartxref(long newStartxref) This will set the start xref.
Object	visitFromArray(COSArray obj) visitFromArray method comment.
Object	visitFromBoolean(COSBoolean obj) visitFromBoolean method comment.
Object	visitFromDictionary(COSDictionary obj) visitFromDictionary method comment.
Object	visitFromDocument(COSDocument doc) The visit from document method.
Object	visitFromFloat(COSFloat obj) visitFromFloat method comment.
Object	visitFromInt(COSInteger obj) visitFromFloat method comment.
Object	visitFromName(COSName obj) visitFromName method comment.
Object	visitFromNull(COSNull obj) visitFromNull method comment.
Object	visitFromStream(COSStream obj) visitFromStream method comment.
Object	visitFromString(COSString obj) visitFromString method comment.
void	write(COSDocument doc) This will write the pdf document.
void	write(PDDocument doc) This will write the pdf document.
void	writeReference(COSBase obj) visitFromObjRef method comment.

Methods inherited from class java.lang.Object

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

Field Detail

DICT_OPEN

public static final byte[] DICT_OPEN

The dictionary open token.

DICT_CLOSE

public static final byte[] DICT_CLOSE

The dictionary close token.

SPACE

public static final byte[] SPACE

space character.

COMMENT

public static final byte[] COMMENT

The start to a PDF comment.

VERSION

public static final byte[] VERSION

The output version of the PDF.

GARBAGE

public static final byte[] GARBAGE

Garbage bytes used to create the PDF header.

EOF

public static final byte[] EOF

The EOF constant.

REFERENCE

public static final byte[] REFERENCE

The reference token.

XREF

public static final byte[] XREF

The XREF token.

XREF_FREE

public static final byte[] XREF_FREE

The xref free token.

XREF_USED

public static final byte[] XREF_USED

The xref used token.

TRAILER

public static final byte[] TRAILER

The trailer token.

STARTXREF

public static final byte[] STARTXREF

The start xref token.

OBJ

public static final byte[] OBJ

The starting object token.

ENDOBJ

public static final byte[] ENDOBJ

The end object token.

ARRAY_OPEN

public static final byte[] ARRAY_OPEN

The array open token.

ARRAY_CLOSE

public static final byte[] ARRAY_CLOSE

The array close token.

STREAM

public static final byte[] STREAM

The open stream token.

ENDSTREAM

public static final byte[] ENDSTREAM

The close stream token.

Constructor Detail

COSWriter

public COSWriter(OutputStream os)

COSWriter constructor comment.

Parameters:

os - The wrapped output stream.

COSWriter

public COSWriter(OutputStream os,
         InputStream is)

COSWriter constructor for incremental updates.

Parameters:

os - The wrapped output stream.

is - input stream

Method Detail

addXRefEntry

protected void addXRefEntry(COSWriterXRefEntry entry)

add an entry in the x ref table for later dump.

Parameters:

entry - The new entry to add.

close

public void close()
           throws IOException

This will close the stream.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException - If the underlying stream throws an exception.

getNumber

protected long getNumber()

This will get the current object number.

Returns:

The current object number.

getObjectKeys

public Map<COSBase,COSObjectKey> getObjectKeys()

This will get all available object keys.

Returns:

A map of all object keys.

getOutput

protected OutputStream getOutput()

This will get the output stream.

Returns:

The output stream.

getStandardOutput

protected COSStandardOutputStream getStandardOutput()

This will get the standard output stream.

Returns:

The standard output stream.

getStartxref

protected long getStartxref()

This will get the current start xref.

Returns:

The current start xref.

getXRefEntries

protected List<COSWriterXRefEntry> getXRefEntries()

This will get the xref entries.

Returns:

All available xref entries.

setNumber

protected void setNumber(long newNumber)

This will set the current object number.

Parameters:

newNumber - The new object number.

setStartxref

protected void setStartxref(long newStartxref)

This will set the start xref.

Parameters:

newStartxref - The new start xref attribute.

doWriteBody

protected void doWriteBody(COSDocument doc)
                    throws IOException,
                           COSVisitorException

This will write the body of the document.

Parameters:

doc - The document to write the body for.

Throws:

IOException - If there is an error writing the data.

COSVisitorException - If there is an error generating the data.

doWriteObject

public void doWriteObject(COSBase obj)
                   throws COSVisitorException

This will write a COS object.

Parameters:

obj - The object to write.

Throws:

COSVisitorException - If there is an error visiting objects.

doWriteHeader

protected void doWriteHeader(COSDocument doc)
                      throws IOException

This will write the header to the PDF document.

Parameters:

doc - The document to get the data from.

Throws:

IOException - If there is an error writing to the stream.

doWriteTrailer

protected void doWriteTrailer(COSDocument doc)
                       throws IOException,
                              COSVisitorException

This will write the trailer to the PDF document.

Parameters:

doc - The document to create the trailer for.

Throws:

IOException - If there is an IOError while writing the document.

COSVisitorException - If there is an error while generating the data.

doWriteXRef

protected void doWriteXRef(COSDocument doc)
                    throws IOException

write the x ref section for the pdf file currently, the pdf is reconstructed from the scratch, so we write a single section todo support for incremental writing?

Parameters:

doc - The document to write the xref from.

Throws:

IOException - If there is an error writing the data to the stream.

getXRefRanges

protected Integer[] getXRefRanges(List<COSWriterXRefEntry> xRefEntriesList)

check the xref entries and write out the ranges. The format of the returned array is exactly the same as the pdf specification. See section 7.5.4 of ISO32000-1:2008, example 1 (page 40) for reference.

example: 0 1 2 5 6 7 8 10

will create a array with follow ranges

0 3 5 4 10 1

this mean that the element 0 is followed by two other related numbers that represent a cluster of the size 3. 5 is follow by three other related numbers and create a cluster of size 4. etc.

Parameters:

xRefEntriesList - list with the xRef entries that was written

Returns:

a integer array with the ranges

visitFromArray

public Object visitFromArray(COSArray obj)
                      throws COSVisitorException

visitFromArray method comment.

Specified by:

visitFromArray in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromBoolean

public Object visitFromBoolean(COSBoolean obj)
                        throws COSVisitorException

visitFromBoolean method comment.

Specified by:

visitFromBoolean in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromDictionary

public Object visitFromDictionary(COSDictionary obj)
                           throws COSVisitorException

visitFromDictionary method comment.

Specified by:

visitFromDictionary in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromDocument

public Object visitFromDocument(COSDocument doc)
                         throws COSVisitorException

The visit from document method.

Specified by:

visitFromDocument in interface ICOSVisitor

Parameters:

doc - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromFloat

public Object visitFromFloat(COSFloat obj)
                      throws COSVisitorException

visitFromFloat method comment.

Specified by:

visitFromFloat in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromInt

public Object visitFromInt(COSInteger obj)
                    throws COSVisitorException

visitFromFloat method comment.

Specified by:

visitFromInt in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromName

public Object visitFromName(COSName obj)
                     throws COSVisitorException

visitFromName method comment.

Specified by:

visitFromName in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromNull

public Object visitFromNull(COSNull obj)
                     throws COSVisitorException

visitFromNull method comment.

Specified by:

visitFromNull in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

writeReference

public void writeReference(COSBase obj)
                    throws COSVisitorException

visitFromObjRef method comment.

Parameters:

obj - The object that is being visited.

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromStream

public Object visitFromStream(COSStream obj)
                       throws COSVisitorException

visitFromStream method comment.

Specified by:

visitFromStream in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

visitFromString

public Object visitFromString(COSString obj)
                       throws COSVisitorException

visitFromString method comment.

Specified by:

visitFromString in interface ICOSVisitor

Parameters:

obj - The object that is being visited.

Returns:

null

Throws:

COSVisitorException - If there is an exception while visiting this object.

write

public void write(COSDocument doc)
           throws COSVisitorException

This will write the pdf document.

Parameters:

doc - The document to write.

Throws:

COSVisitorException - If an error occurs while generating the data.

write

public void write(PDDocument doc)
           throws COSVisitorException

This will write the pdf document.

Parameters:

doc - The document to write.

Throws:

COSVisitorException - If an error occurs while generating the data.

IllegalStateException - If the document has an encryption dictionary but no protection policy.