com.lowagie.text.pdf.parser
Class PdfContentStreamProcessor

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

Direct Known Subclasses:

SimpleTextExtractingPdfContentStreamProcessor

public abstract 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 PdfDictionary	resources Resources for the content stream.
private Matrix	textLineMatrix Text line matrix.
private Matrix	textMatrix Text matrix.

Constructor Summary

PdfContentStreamProcessor()
Creates a new PDF Content Stream Processor.

Method Summary

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
void	displayPdfString(PdfString string, float tj) Displays text.
abstract void	displayText(String text, Matrix nextTextMatrix) Displays text.
Matrix	getCurrentTextLineMatrix() Returns the current line matrix.
Matrix	getCurrentTextMatrix() Returns the current text matrix.
float	getStringWidth(String string, float tj) Gets the width of a String.
GraphicsState	gs() Returns the current graphics state.
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	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.

Constructor Detail

PdfContentStreamProcessor

public PdfContentStreamProcessor()

Creates a new PDF Content Stream Processor.

Method Detail

populateOperators

private void populateOperators()

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

reset

public void reset()

Resets the graphics state stack, matrices and resources.

gs

public GraphicsState gs()

Returns the current graphics state.

Returns:

the graphics state

getCurrentTextMatrix

public Matrix getCurrentTextMatrix()

Returns the current text matrix.

Returns:

the text matrix

Since:

2.1.5

getCurrentTextLineMatrix

public Matrix getCurrentTextLineMatrix()

Returns the current line matrix.

Returns:

the line matrix

Since:

2.1.5

invokeOperator

public 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

displayText

public abstract void displayText(String text,
                                 Matrix nextTextMatrix)

Displays text.

Parameters:

text - the text that needs to be displayed

nextTextMatrix - a text matrix

getStringWidth

public float getStringWidth(String string,
                            float tj)

Gets the width of a String.

Parameters:

string - the string that needs measuring

tj - text adjustment

Returns:

the width of a String

displayPdfString

public void displayPdfString(PdfString string,
                             float tj)

Displays text.

Parameters:

string - the text to display

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