com.lowagie.text.pdf.parser
Class PdfContentStreamProcessor

java.lang.Object
  com.lowagie.text.pdf.parser.PdfContentStreamProcessor

public class PdfContentStreamProcessor
extends Object

Processor for a PDF content Stream.

Since:

2.1.4

Nested Class Summary

private static class	PdfContentStreamProcessor.BeginText A content operator implementation (BT).
private static class	PdfContentStreamProcessor.EndText A content operator implementation (ET).
private static class	PdfContentStreamProcessor.ModifyCurrentTransformationMatrix A content operator implementation (cm).
private static class	PdfContentStreamProcessor.MoveNextLineAndShowText A content operator implementation (').
private static class	PdfContentStreamProcessor.MoveNextLineAndShowTextWithSpacing A content operator implementation (").
private static class	PdfContentStreamProcessor.PopGraphicsState A content operator implementation (Q).
private static class	PdfContentStreamProcessor.ProcessGraphicsStateResource A content operator implementation (gs).
private static class	PdfContentStreamProcessor.PushGraphicsState A content operator implementation (q).
private static class	PdfContentStreamProcessor.SetTextCharacterSpacing A content operator implementation (Tc).
private static class	PdfContentStreamProcessor.SetTextFont A content operator implementation (Tf).
private static class	PdfContentStreamProcessor.SetTextHorizontalScaling A content operator implementation (Tz).
private static class	PdfContentStreamProcessor.SetTextLeading A content operator implementation (TL).
private static class	PdfContentStreamProcessor.SetTextRenderMode A content operator implementation (Tr).
private static class	PdfContentStreamProcessor.SetTextRise A content operator implementation (Ts).
private static class	PdfContentStreamProcessor.SetTextWordSpacing A content operator implementation (Tw).
private static class	PdfContentStreamProcessor.ShowText A content operator implementation (Tj).
private static class	PdfContentStreamProcessor.ShowTextArray A content operator implementation (TJ).
private static class	PdfContentStreamProcessor.TextMoveNextLine A content operator implementation (T*).
private static class	PdfContentStreamProcessor.TextMoveStartNextLine A content operator implementation (Td).
private static class	PdfContentStreamProcessor.TextMoveStartNextLineWithLeading A content operator implementation (TD).
private static class	PdfContentStreamProcessor.TextSetTextMatrix A content operator implementation (Tm).

Field Summary

private Stack	gsStack Stack keeping track of the graphics state.
private Map	operators A map with all supported operators operators (PDF syntax).
private RenderListener	renderListener A list of listeners that will be notified of render events
private PdfDictionary	resources Resources for the content stream.
private Matrix	textLineMatrix Text line matrix.
private Matrix	textMatrix Text matrix.

Constructor Summary

PdfContentStreamProcessor(RenderListener renderListener)
Creates a new PDF Content Stream Processor that will send it's output to the designated render listener.

Method Summary

private void	applyTextAdjust(float tj) Adjusts the text matrix for the specified adjustment value (see TJ operator in the PDF spec for information)
private String	decode(PdfString in) Decodes a PdfString (which will contain glyph ids encoded in the font's encoding) based on the active font, and determine the unicode equivalent
private void	displayPdfString(PdfString string) Displays text.
private Matrix	getCurrentTextLineMatrix() Returns the current line matrix.
private Matrix	getCurrentTextMatrix() Returns the current text matrix.
private GraphicsState	gs() Returns the current graphics state.
private void	invokeOperator(PdfLiteral operator, ArrayList operands) Invokes an operator.
private void	populateOperators() Loads all the supported graphics and text state operators in a map.
void	processContent(byte[] contentBytes, PdfDictionary resources) Processes PDF syntax
void	registerContentOperator(String operatorString, ContentOperator operator) Registers a content operator that will be called when the specified operator string is encountered during content processing.
void	reset() Resets the graphics state stack, matrices and resources.

Methods inherited from class java.lang.Object

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

Field Detail

operators

private Map operators

A map with all supported operators operators (PDF syntax).

resources

private PdfDictionary resources

Resources for the content stream.

gsStack

private Stack gsStack

Stack keeping track of the graphics state.

textMatrix

private Matrix textMatrix

Text matrix.

textLineMatrix

private Matrix textLineMatrix

Text line matrix.

renderListener

private final RenderListener renderListener

A list of listeners that will be notified of render events

Constructor Detail

PdfContentStreamProcessor

public PdfContentStreamProcessor(RenderListener renderListener)

Creates a new PDF Content Stream Processor that will send it's output to the designated render listener.

Parameters:

renderListener - the AbstractRenderListener that will receive rendering notifications

Method Detail

populateOperators

private void populateOperators()

Loads all the supported graphics and text state operators in a map.

registerContentOperator

public void registerContentOperator(String operatorString,
                                    ContentOperator operator)

Registers a content operator that will be called when the specified operator string is encountered during content processing. Each operator may be registered only once (it is not legal to have multiple operators with the same operatorString)

Parameters:

operatorString - the operator id

operator - the operator that will receive notification when the operator is encountered

Since:

2.1.7

reset

public void reset()

Resets the graphics state stack, matrices and resources.

gs

private GraphicsState gs()

Returns the current graphics state.

Returns:

the graphics state

getCurrentTextMatrix

private Matrix getCurrentTextMatrix()

Returns the current text matrix.

Returns:

the text matrix

Since:

2.1.5

getCurrentTextLineMatrix

private Matrix getCurrentTextLineMatrix()

Returns the current line matrix.

Returns:

the line matrix

Since:

2.1.5

invokeOperator

private void invokeOperator(PdfLiteral operator,
                            ArrayList operands)

Invokes an operator.

Parameters:

operator - the PDF Syntax of the operator

operands - a list with operands

decode

private String decode(PdfString in)

Decodes a PdfString (which will contain glyph ids encoded in the font's encoding) based on the active font, and determine the unicode equivalent

Parameters:

in - the String that needs to be encoded

Returns:

the encoded String

Since:

2.1.7

displayPdfString

private void displayPdfString(PdfString string)

Displays text.

Parameters:

string - the text to display

applyTextAdjust

private void applyTextAdjust(float tj)

Adjusts the text matrix for the specified adjustment value (see TJ operator in the PDF spec for information)

Parameters:

tj - the text adjustment

processContent

public void processContent(byte[] contentBytes,
                           PdfDictionary resources)

Processes PDF syntax

Parameters:

contentBytes - the bytes of a content stream

resources - the resources that come with the content stream