org.apache.pdfbox.pdfparser

Class NonSequentialPDFParser

java.lang.Object

org.apache.pdfbox.pdfparser.BaseParser

org.apache.pdfbox.pdfparser.PDFParser

org.apache.pdfbox.pdfparser.NonSequentialPDFParser

public class NonSequentialPDFParser
extends PDFParser

PDFParser which first reads startxref and xref tables in order to know valid objects and parse only these objects. Thus it is closer to a conforming parser than the sequential reading of PDFParser. This class can be used as a PDFParser replacement. First parse() must be called before page objects can be retrieved, e.g. getPDDocument(). This class is a much enhanced version of QuickParser presented in PDFBOX-1104 by Jeremy Villalobos.

Field Summary

Fields

Modifier and Type	Field and Description
static String	SYSPROP_EOFLOOKUPRANGE
static String	SYSPROP_PARSEMINIMAL

Fields inherited from class org.apache.pdfbox.pdfparser.PDFParser

xrefTrailerResolver

Fields inherited from class org.apache.pdfbox.pdfparser.BaseParser

DEF, document, ENDOBJ, ENDSTREAM, FORCE_PARSING, forceParsing, pdfSource

Constructor Summary

Constructors

Constructor and Description
NonSequentialPDFParser(File file, RandomAccess raBuf) Constructs parser for given file using given buffer for temporary storage.
NonSequentialPDFParser(File file, RandomAccess raBuf, String decryptionPassword) Constructs parser for given file using given buffer for temporary storage.
NonSequentialPDFParser(String filename) Constructs parser for given file using memory buffer.

Method Summary

Methods

Modifier and Type	Method and Description
PDPage	getPage(int pageNr) Returns the page requested with all the objects loaded into it.
int	getPageNumber() Returns the number of pages in a document.
PDDocument	getPDDocument() This will get the PD document that was parsed.
SecurityHandler	getSecurityHandler() Returns security handler of the document or null if document is not encrypted or parse() wasn't called before.
void	parse() This will parse the stream and populate the COSDocument object.
protected COSStream	parseCOSStream(COSDictionary dic, RandomAccess file) This will read a COSStream from the input stream using length attribute within dictionary.
void	setEOFLookupRange(int byteCount) Sets how many trailing bytes of PDF file are searched for EOF marker and 'startxref' marker.

Methods inherited from class org.apache.pdfbox.pdfparser.PDFParser

getDocument, getFDFDocument, isContinueOnError, parseStartXref, parseTrailer, parseXrefStream, parseXrefTable, setTempDirectory

Methods inherited from class org.apache.pdfbox.pdfparser.BaseParser

isClosing, isClosing, isEndOfName, isEOL, isEOL, isWhitespace, isWhitespace, parseBoolean, parseCOSArray, parseCOSDictionary, parseCOSName, parseCOSString, parseDirObject, readExpectedString, readInt, readLine, readString, readString, setDocument, skipSpaces

Methods inherited from class java.lang.Object

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

Field Detail

SYSPROP_PARSEMINIMAL

public static final String SYSPROP_PARSEMINIMAL

See Also:

Constant Field Values

SYSPROP_EOFLOOKUPRANGE

public static final String SYSPROP_EOFLOOKUPRANGE

See Also:

Constant Field Values

Constructor Detail

NonSequentialPDFParser

public NonSequentialPDFParser(String filename)
                       throws IOException

Constructs parser for given file using memory buffer.

Parameters:

filename - the filename of the pdf to be parsed

Throws:

IOException - If something went wrong.

NonSequentialPDFParser

public NonSequentialPDFParser(File file,
                      RandomAccess raBuf)
                       throws IOException

Constructs parser for given file using given buffer for temporary storage.

Parameters:

file - the pdf to be parsed

raBuf - the buffer to be used for parsing

Throws:

IOException - If something went wrong.

NonSequentialPDFParser

public NonSequentialPDFParser(File file,
                      RandomAccess raBuf,
                      String decryptionPassword)
                       throws IOException

Constructs parser for given file using given buffer for temporary storage.

Parameters:

file - the pdf to be parsed

raBuf - the buffer to be used for parsing

decryptionPassword - password to be used for decryption

Throws:

IOException - If something went wrong.

Method Detail

setEOFLookupRange

public void setEOFLookupRange(int byteCount)

Sets how many trailing bytes of PDF file are searched for EOF marker and 'startxref' marker. If not set we use default value DEFAULT_TRAIL_BYTECOUNT.

In case system property SYSPROP_EOFLOOKUPRANGE is defined this value will be set on initialization but can be overwritten later.

Parameters:

byteCount - number of trailing bytes

parse

public void parse()
           throws IOException

This will parse the stream and populate the COSDocument object. This will close the stream when it is done parsing.

Overrides:

parse in class PDFParser

Throws:

IOException - If there is an error reading from the stream or corrupt data is found.

getSecurityHandler

public SecurityHandler getSecurityHandler()

Returns security handler of the document or null if document is not encrypted or parse() wasn't called before.

Returns:

the security handler.

getPDDocument

public PDDocument getPDDocument()
                         throws IOException

This will get the PD document that was parsed. When you are done with this document you must call close() on it to release resources. Overwriting super method was necessary in order to set security handler.

Overrides:

getPDDocument in class PDFParser

Returns:

The document at the PD layer.

Throws:

IOException - If there is an error getting the document.

getPageNumber

public int getPageNumber()
                  throws IOException

Returns the number of pages in a document.

Returns:

the number of pages.

Throws:

IOException - if PAGES or other needed object is missing

getPage

public PDPage getPage(int pageNr)
               throws IOException

Returns the page requested with all the objects loaded into it.

Parameters:

pageNr - starts from 0 to the number of pages.

Returns:

the page with the given pagenumber.

Throws:

IOException - If something went wrong.

parseCOSStream

protected COSStream parseCOSStream(COSDictionary dic,
                       RandomAccess file)
                            throws IOException

This will read a COSStream from the input stream using length attribute within dictionary. If length attribute is a indirect reference it is first resolved to get the stream length. This means we copy stream data without testing for 'endstream' or 'endobj' and thus it is no problem if these keywords occur within stream. We require 'endstream' to be found after stream data is read.

Overrides:

parseCOSStream in class BaseParser

Parameters:

dic - dictionary that goes with this stream.

file - file to write the stream to when reading.

Returns:

parsed pdf stream.

Throws:

IOException - if an error occurred reading the stream, like problems with reading length attribute, stream does not end with 'endstream' after data read, stream too short etc.