PDFStreamEngine (PDFBox reactor 2.0.4 API)

java.lang.Object
- org.apache.pdfbox.contentstream.PDFStreamEngine

Direct Known Subclasses:

PDFGraphicsStreamEngine, PDFMarkedContentExtractor, PDFTextStripper, PreflightStreamEngine, PrintImageLocations
```
public abstract class PDFStreamEngine
extends Object
```
Processes a PDF content stream and executes certain operations. Provides a callback interface for clients that want to do things with the stream.

Author:

Ben Litchfield

Constructor Summary

Constructors
Modifier Constructor and Description

protected PDFStreamEngine()
Creates a new PDFStreamEngine.

Constructors
Modifier	Constructor and Description
`protected`	`PDFStreamEngine()` Creates a new PDFStreamEngine.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addOperator(OperatorProcessor op)` Adds an operator processor to the engine.
`protected void`	`applyTextAdjustment(float tx, float ty)` Applies a text position adjustment from the TJ operator.
`void`	`beginText()` Called when the BT operator is encountered.
`void`	`endText()` Called when the ET operator is encountered.
`PDAppearanceStream`	`getAppearance(PDAnnotation annotation)` Returns the appearance stream to process for the given annotation.
`PDPage`	`getCurrentPage()` Returns the current page.
`int`	`getGraphicsStackSize()`
`PDGraphicsState`	`getGraphicsState()`
`Matrix`	`getInitialMatrix()` Gets the stream's initial matrix.
`PDResources`	`getResources()` Returns the stream' resources.
`Matrix`	`getTextLineMatrix()`
`Matrix`	`getTextMatrix()`
`protected void`	`operatorException(Operator operator, List<COSBase> operands, IOException e)` Called when an exception is thrown by an operator.
`protected void`	`processAnnotation(PDAnnotation annotation, PDAppearanceStream appearance)` Process the given annotation with the specified appearance stream.
`protected void`	`processChildStream(PDContentStream contentStream, PDPage page)` Process a child stream of the given page.
`protected void`	`processOperator(Operator operator, List<COSBase> operands)` This is used to handle an operation.
`void`	`processOperator(String operation, List<COSBase> arguments)` This is used to handle an operation.
`void`	`processPage(PDPage page)` This will initialise and process the contents of the stream.
`protected void`	`processSoftMask(PDTransparencyGroup group)` Processes a soft mask transparency group stream.
`protected void`	`processTilingPattern(PDTilingPattern tilingPattern, PDColor color, PDColorSpace colorSpace)` Process the given tiling pattern.
`protected void`	`processTilingPattern(PDTilingPattern tilingPattern, PDColor color, PDColorSpace colorSpace, Matrix patternMatrix)` Process the given tiling pattern.
`protected void`	`processTransparencyGroup(PDTransparencyGroup group)` Processes a transparency group stream.
`protected void`	`processType3Stream(PDType3CharProc charProc, Matrix textRenderingMatrix)` Processes a Type 3 character stream.
`void`	`registerOperatorProcessor(String operator, OperatorProcessor op)` Deprecated. Use `addOperator(OperatorProcessor)` instead
`protected void`	`restoreGraphicsStack(Stack<PDGraphicsState> snapshot)` Restores the entire graphics stack.
`void`	`restoreGraphicsState()` Pops the current graphics state from the stack.
`protected Stack<PDGraphicsState>`	`saveGraphicsStack()` Saves the entire graphics stack.
`void`	`saveGraphicsState()` Pushes the current graphics state to the stack.
`void`	`setLineDashPattern(COSArray array, int phase)`
`void`	`setTextLineMatrix(Matrix value)`
`void`	`setTextMatrix(Matrix value)`
`void`	`showAnnotation(PDAnnotation annotation)` Shows the given annotation.
`protected void`	`showFontGlyph(Matrix textRenderingMatrix, PDFont font, int code, String unicode, Vector displacement)` Called when a glyph is to be processed.This method is intended for overriding in subclasses, the default implementation does nothing.
`void`	`showForm(PDFormXObject form)` Shows a form from the content stream.
`protected void`	`showGlyph(Matrix textRenderingMatrix, PDFont font, int code, String unicode, Vector displacement)` Called when a glyph is to be processed.This method is intended for overriding in subclasses, the default implementation does nothing.
`protected void`	`showText(byte[] string)` Process text from the PDF Stream.
`void`	`showTextString(byte[] string)` Called when a string of text is to be shown.
`void`	`showTextStrings(COSArray array)` Called when a string of text with spacing adjustments is to be shown.
`void`	`showTransparencyGroup(PDTransparencyGroup form)` Shows a transparency group from the content stream.
`protected void`	`showType3Glyph(Matrix textRenderingMatrix, PDType3Font font, int code, String unicode, Vector displacement)` Called when a glyph is to be processed.This method is intended for overriding in subclasses, the default implementation does nothing.
`Point2D.Float`	`transformedPoint(float x, float y)` Transforms a point using the CTM.
`protected float`	`transformWidth(float width)` Transforms a width using the CTM.
`protected void`	`unsupportedOperator(Operator operator, List<COSBase> operands)` Called when an unsupported operator is encountered.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PDFStreamEngine
```
protected PDFStreamEngine()
```
    Creates a new PDFStreamEngine.
- Method Detail
  - registerOperatorProcessor
```
@Deprecated
public void registerOperatorProcessor(String operator,
                                        OperatorProcessor op)
```
    Deprecated. Use addOperator(OperatorProcessor) instead
    
    Register a custom operator processor with the engine.
    
    Parameters:
    operator - The operator as a string.
    op - Processor instance.
  - addOperator
```
public final void addOperator(OperatorProcessor op)
```
    Adds an operator processor to the engine.
    
    Parameters:
    op - operator processor
  - processPage
```
public void processPage(PDPage page)
                 throws IOException
```
    This will initialise and process the contents of the stream.
    
    Parameters:
    page - the page to process
    
    Throws:
    
    IOException - if there is an error accessing the stream
  - showTransparencyGroup
```
public void showTransparencyGroup(PDTransparencyGroup form)
                           throws IOException
```
    Shows a transparency group from the content stream.
    
    Parameters:
    form - transparency group (form) XObject
    
    Throws:
    
    IOException - if the transparency group cannot be processed
  - showForm
```
public void showForm(PDFormXObject form)
              throws IOException
```
    Shows a form from the content stream.
    
    Parameters:
    form - form XObject
    
    Throws:
    
    IOException - if the form cannot be processed
  - processSoftMask
```
protected void processSoftMask(PDTransparencyGroup group)
                        throws IOException
```
    Processes a soft mask transparency group stream.
    
    Parameters:
    group -
    
    Throws:
    
    IOException
  - processTransparencyGroup
```
protected void processTransparencyGroup(PDTransparencyGroup group)
                                 throws IOException
```
    Processes a transparency group stream.
    
    Parameters:
    group -
    
    Throws:
    
    IOException
  - processType3Stream
```
protected void processType3Stream(PDType3CharProc charProc,
                      Matrix textRenderingMatrix)
                           throws IOException
```
    Processes a Type 3 character stream.
    
    Parameters:
    charProc - Type 3 character procedure
    textRenderingMatrix - the Text Rendering Matrix
    
    Throws:
    
    IOException - if there is an error reading or parsing the character content stream.
  - processAnnotation
```
protected void processAnnotation(PDAnnotation annotation,
                     PDAppearanceStream appearance)
                          throws IOException
```
    Process the given annotation with the specified appearance stream.
    
    Parameters:
    annotation - The annotation containing the appearance stream to process.
    appearance - The appearance stream to process.
    
    Throws:
    
    IOException - If there is an error reading or parsing the appearance content stream.
  - processTilingPattern
```
protected final void processTilingPattern(PDTilingPattern tilingPattern,
                        PDColor color,
                        PDColorSpace colorSpace)
                                   throws IOException
```
    Process the given tiling pattern.
    
    Parameters:
    tilingPattern - the tiling pattern
    color - color to use, if this is an uncoloured pattern, otherwise null.
    colorSpace - color space to use, if this is an uncoloured pattern, otherwise null.
    
    Throws:
    
    IOException - if there is an error reading or parsing the tiling pattern content stream.
  - processTilingPattern
```
protected final void processTilingPattern(PDTilingPattern tilingPattern,
                        PDColor color,
                        PDColorSpace colorSpace,
                        Matrix patternMatrix)
                                   throws IOException
```
    Process the given tiling pattern. Allows the pattern matrix to be overridden for custom rendering.
    
    Parameters:
    tilingPattern - the tiling pattern
    color - color to use, if this is an uncoloured pattern, otherwise null.
    colorSpace - color space to use, if this is an uncoloured pattern, otherwise null.
    patternMatrix - the pattern matrix, may be overridden for custom rendering.
    
    Throws:
    
    IOException - if there is an error reading or parsing the tiling pattern content stream.
  - showAnnotation
```
public void showAnnotation(PDAnnotation annotation)
                    throws IOException
```
    Shows the given annotation.
    
    Parameters:
    annotation - An annotation on the current page.
    
    Throws:
    
    IOException - If an error occurred reading the annotation
  - getAppearance
```
public PDAppearanceStream getAppearance(PDAnnotation annotation)
```
    Returns the appearance stream to process for the given annotation. May be used to render a specific appearance such as "hover".
    
    Parameters:
    annotation - The current annotation.
    
    Returns:
    The stream to process.
  - processChildStream
```
protected void processChildStream(PDContentStream contentStream,
                      PDPage page)
                           throws IOException
```
    Process a child stream of the given page. Cannot be used with processPage(PDPage).
    
    Parameters:
    contentStream - the child content stream
    page -
    
    Throws:
    
    IOException - if there is an exception while processing the stream
  - beginText
```
public void beginText()
               throws IOException
```
    Called when the BT operator is encountered. This method is for overriding in subclasses, the default implementation does nothing.
    
    Throws:
    
    IOException - if there was an error processing the text
  - endText
```
public void endText()
             throws IOException
```
    Called when the ET operator is encountered. This method is for overriding in subclasses, the default implementation does nothing.
    
    Throws:
    
    IOException - if there was an error processing the text
  - showTextString
```
public void showTextString(byte[] string)
                    throws IOException
```
    Called when a string of text is to be shown.
    
    Parameters:
    string - the encoded text
    
    Throws:
    
    IOException - if there was an error showing the text
  - showTextStrings
```
public void showTextStrings(COSArray array)
                     throws IOException
```
    Called when a string of text with spacing adjustments is to be shown.
    
    Parameters:
    array - array of encoded text strings and adjustments
    
    Throws:
    
    IOException - if there was an error showing the text
  - applyTextAdjustment
```
protected void applyTextAdjustment(float tx,
                       float ty)
                            throws IOException
```
    Applies a text position adjustment from the TJ operator. May be overridden in subclasses.
    
    Parameters:
    tx - x-translation
    ty - y-translation
    
    Throws:
    
    IOException
  - showText
```
protected void showText(byte[] string)
                 throws IOException
```
    Process text from the PDF Stream. You should override this method if you want to perform an action when encoded text is being processed.
    
    Parameters:
    string - the encoded text
    
    Throws:
    
    IOException - if there is an error processing the string
  - showGlyph
```
protected void showGlyph(Matrix textRenderingMatrix,
             PDFont font,
             int code,
             String unicode,
             Vector displacement)
                  throws IOException
```
    Called when a glyph is to be processed.This method is intended for overriding in subclasses, the default implementation does nothing.
    
    Parameters:
    textRenderingMatrix - the current text rendering matrix, T_rm
    font - the current font
    code - internal PDF character code for the glyph
    unicode - the Unicode text for this glyph, or null if the PDF does provide it
    displacement - the displacement (i.e. advance) of the glyph in text space
    
    Throws:
    
    IOException - if the glyph cannot be processed
  - showFontGlyph
```
protected void showFontGlyph(Matrix textRenderingMatrix,
                 PDFont font,
                 int code,
                 String unicode,
                 Vector displacement)
                      throws IOException
```
    Called when a glyph is to be processed.This method is intended for overriding in subclasses, the default implementation does nothing.
    
    Parameters:
    textRenderingMatrix - the current text rendering matrix, T_rm
    font - the current font
    code - internal PDF character code for the glyph
    unicode - the Unicode text for this glyph, or null if the PDF does provide it
    displacement - the displacement (i.e. advance) of the glyph in text space
    
    Throws:
    
    IOException - if the glyph cannot be processed
  - showType3Glyph
```
protected void showType3Glyph(Matrix textRenderingMatrix,
                  PDType3Font font,
                  int code,
                  String unicode,
                  Vector displacement)
                       throws IOException
```
    Called when a glyph is to be processed.This method is intended for overriding in subclasses, the default implementation does nothing.
    
    Parameters:
    textRenderingMatrix - the current text rendering matrix, T_rm
    font - the current font
    code - internal PDF character code for the glyph
    unicode - the Unicode text for this glyph, or null if the PDF does provide it
    displacement - the displacement (i.e. advance) of the glyph in text space
    
    Throws:
    
    IOException - if the glyph cannot be processed
  - processOperator
```
public void processOperator(String operation,
                   List<COSBase> arguments)
                     throws IOException
```
    This is used to handle an operation.
    
    Parameters:
    operation - The operation to perform.
    arguments - The list of arguments.
    
    Throws:
    
    IOException - If there is an error processing the operation.
  - processOperator
```
protected void processOperator(Operator operator,
                   List<COSBase> operands)
                        throws IOException
```
    This is used to handle an operation.
    
    Parameters:
    operator - The operation to perform.
    operands - The list of arguments.
    
    Throws:
    
    IOException - If there is an error processing the operation.
  - unsupportedOperator
```
protected void unsupportedOperator(Operator operator,
                       List<COSBase> operands)
                            throws IOException
```
    Called when an unsupported operator is encountered.
    
    Parameters:
    operator - The unknown operator.
    operands - The list of operands.
    
    Throws:
    
    IOException
  - operatorException
```
protected void operatorException(Operator operator,
                     List<COSBase> operands,
                     IOException e)
                          throws IOException
```
    Called when an exception is thrown by an operator.
    
    Parameters:
    operator - The unknown operator.
    operands - The list of operands.
    
    Throws:
    
    IOException
  - saveGraphicsState
```
public void saveGraphicsState()
```
    Pushes the current graphics state to the stack.
  - restoreGraphicsState
```
public void restoreGraphicsState()
```
    Pops the current graphics state from the stack.
  - saveGraphicsStack
```
protected final Stack<PDGraphicsState> saveGraphicsStack()
```
    Saves the entire graphics stack.
  - restoreGraphicsStack
```
protected final void restoreGraphicsStack(Stack<PDGraphicsState> snapshot)
```
    Restores the entire graphics stack.
  - getGraphicsStackSize
```
public int getGraphicsStackSize()
```
    Returns:
    Returns the size of the graphicsStack.
  - getGraphicsState
```
public PDGraphicsState getGraphicsState()
```
    Returns:
    Returns the graphicsState.
  - getTextLineMatrix
```
public Matrix getTextLineMatrix()
```
    Returns:
    Returns the textLineMatrix.
  - setTextLineMatrix
```
public void setTextLineMatrix(Matrix value)
```
    Parameters:
    value - The textLineMatrix to set.
  - getTextMatrix
```
public Matrix getTextMatrix()
```
    Returns:
    Returns the textMatrix.
  - setTextMatrix
```
public void setTextMatrix(Matrix value)
```
    Parameters:
    value - The textMatrix to set.
  - setLineDashPattern
```
public void setLineDashPattern(COSArray array,
                      int phase)
```
    Parameters:
    array - dash array
    phase - dash phase
  - getResources
```
public PDResources getResources()
```
    Returns the stream' resources.
  - getCurrentPage
```
public PDPage getCurrentPage()
```
    Returns the current page.
  - getInitialMatrix
```
public Matrix getInitialMatrix()
```
    Gets the stream's initial matrix.
  - transformedPoint
```
public Point2D.Float transformedPoint(float x,
                             float y)
```
    Transforms a point using the CTM.
  - transformWidth
```
protected float transformWidth(float width)
```
    Transforms a width using the CTM.

Class PDFStreamEngine

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

PDFStreamEngine

Method Detail

registerOperatorProcessor

addOperator

processPage

showTransparencyGroup

showForm

processSoftMask

processTransparencyGroup

processType3Stream

processAnnotation

processTilingPattern

processTilingPattern

showAnnotation

getAppearance

processChildStream

beginText

endText

showTextString

showTextStrings

applyTextAdjustment

showText

showGlyph

showFontGlyph

showType3Glyph

processOperator

processOperator

unsupportedOperator

operatorException

saveGraphicsState

restoreGraphicsState

saveGraphicsStack

restoreGraphicsStack

getGraphicsStackSize

getGraphicsState

getTextLineMatrix

setTextLineMatrix

getTextMatrix

setTextMatrix

setLineDashPattern

getResources

getCurrentPage

getInitialMatrix

transformedPoint

transformWidth