Package com.aowagie.text.pdf.parser

Class PdfContentStreamProcessor

java.lang.Object

com.aowagie.text.pdf.parser.PdfContentStreamProcessor

Direct Known Subclasses:

SimpleTextExtractingPdfContentStreamProcessor

abstract class PdfContentStreamProcessor
extends Object

Processor for a PDF content Stream.

Since:

2.1.4

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
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

Fields

Modifier and Type	Field	Description
private final 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

Constructors

Constructor	Description
PdfContentStreamProcessor()	Creates a new PDF Content Stream Processor.

Method Summary

Modifier and Type	Method	Description
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, 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.
private float	getStringWidth(String string, float tj)	Gets the width of a String.
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	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 Details

operators

private Map operators

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

resources

private PdfDictionary resources

Resources for the content stream.

gsStack

private final Stack gsStack

Stack keeping track of the graphics state.

textMatrix

private Matrix textMatrix

Text matrix.

textLineMatrix

private Matrix textLineMatrix

Text line matrix.

Constructor Details

PdfContentStreamProcessor

public PdfContentStreamProcessor()

Creates a new PDF Content Stream Processor.

Method Details

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

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

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

private 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

private 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