net.sourceforge.barbecue
Class Barcode

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              net.sourceforge.barbecue.Barcode

All Implemented Interfaces:

ImageObserver, MenuContainer, Printable, Serializable

Direct Known Subclasses:

LinearBarcode

public abstract class Barcode
extends JComponent
implements Printable

Abstract barcode class that provides functionality that is common to all barcodes. Specific barcode implementations must subclass this and provide information specific to the barcode type they are implementing.

Author:

Ian Bourke

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

protected int	barHeight
protected int	barWidth
protected String	data
protected boolean	drawingQuietSection
protected boolean	drawingText
protected String	label

Fields inherited from class javax.swing.JComponent

accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.print.Printable

NO_SUCH_PAGE, PAGE_EXISTS

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

protected

Barcode(String data)

Method Summary

protected String	beautify(String s)
protected abstract Module	calculateChecksum()
protected int	calculateMinimumBarHeight(int resolution)
void	draw(Graphics2D g, int x, int y) Renders this Barcode at the specified location in the specified Graphics2D context.
protected abstract Dimension	draw(Output output, int x, int y, int barWidth, int barHeight)
protected int	drawModule(Module module, Output output, int x, int y, int barWidth, int barHeight)
protected abstract Module[]	encodeData()
Rectangle	getBounds() From JComponent.
Rectangle	getBounds(Rectangle rv) From JComponent.
String	getData() Returns the data that the barcode is coding for.
int	getHeight() From JComponent.
String	getLabel() Returns the text that will be displayed underneath the barcode (if requested).
Dimension	getMaximumSize() From JComponent.
Dimension	getMinimumSize() From JComponent.
protected abstract Module	getPostAmble()
protected abstract Module	getPreAmble()
Dimension	getPreferredSize() From JComponent.
protected int	getResolution()
Dimension	getSize() From JComponent.
int	getWidth() From JComponent.
int	getX() From JComponent.
int	getY() From JComponent.
boolean	isDrawingQuietSection() Indicates whether the barcode is drawing leading and trailing white space/quiet area.
boolean	isDrawingText() Indicates whether the barcode is drawing a text label underneath the barcode or not.
void	output(Output output)
protected void	paintComponent(Graphics g) From JComponent.
int	print(Graphics g, PageFormat pageFormat, int pageIndex)
void	setBarHeight(int barHeight) Sets the desired height for the bars in the barcode (in pixels).
void	setBarWidth(int barWidth) Sets the desired bar width for the barcode.
void	setDrawingQuietSection(boolean drawingQuietSection) Indicates whether the leading and trailing white space should be rendered.
void	setDrawingText(boolean drawingText) Indicates whether the barcode data should be shown as a string underneath the barcode or not.
void	setFont(Font font) Sets the font to use when drawing the barcode data string underneath the barcode.
void	setLabel(String label) Sets the human readable text to be displayed underneath the barcode.
void	setResolution(int resolution) Sets the desired output resolution for the barcode.
String	toString()

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getAccessibleContext, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getNextFocusableComponent, getPopupLocation, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getUIClassID, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintImmediately, paintImmediately, paramString, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update, updateUI

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Field Detail

data

protected String data

label

protected String label

drawingText

protected boolean drawingText

drawingQuietSection

protected boolean drawingQuietSection

barWidth

protected int barWidth

barHeight

protected int barHeight

Constructor Detail

Barcode

protected Barcode(String data)
           throws BarcodeException

Throws:

BarcodeException

Method Detail

getData

public String getData()

Returns the data that the barcode is coding for.

Returns:

The barcode raw data

setFont

public void setFont(Font font)

Sets the font to use when drawing the barcode data string underneath the barcode.

Note that changing this setting after a barcode has been drawn will invalidate the component and may force a refresh.

Overrides:

setFont in class JComponent

Parameters:

font - The font to use

setDrawingText

public void setDrawingText(boolean drawingText)

Indicates whether the barcode data should be shown as a string underneath the barcode or not.

Note that changing this setting after a barcode has been drawn will invalidate the component and may force a refresh.

Parameters:

drawingText - True if the text should be shown, false if not

isDrawingText

public boolean isDrawingText()

Indicates whether the barcode is drawing a text label underneath the barcode or not.

Returns:

True if the text is drawn, false otherwise

setDrawingQuietSection

public void setDrawingQuietSection(boolean drawingQuietSection)

Indicates whether the leading and trailing white space should be rendered.

Note that changing this setting after a barcode has been drawn will invalidate the component and may force a refresh.

Parameters:

drawingQuietSection - True if the quiet area/white space should be shown, false if not

isDrawingQuietSection

public boolean isDrawingQuietSection()

Indicates whether the barcode is drawing leading and trailing white space/quiet area.

Returns:

True if the quiet area/white space is drawn, false otherwise

setBarWidth

public void setBarWidth(int barWidth)

Sets the desired bar width for the barcode. This is the width (in pixels) of the thinnest bar in the barcode. Other bars will change their size relative to this.

Note that changing this setting after a barcode has been drawn will invalidate the component and may force a refresh.

Parameters:

barWidth - The desired width of the thinnest bar in pixels

setBarHeight

public void setBarHeight(int barHeight)

Sets the desired height for the bars in the barcode (in pixels). Note that some barcode implementations will not allow the height to go below a minimum size. This is not the height of the component as a whole, as it does not specify the height of any text that may be drawn and does not include borders.

Note that changing this setting after a barcode has been drawn will invalidate the component and may force a refresh.

Parameters:

barHeight - The desired height of the barcode bars in pixels

setResolution

public void setResolution(int resolution)

Sets the desired output resolution for the barcode. This method should be used in cases where the barcode is either being outputted to a device other than the screen, or the barcode is being generated on a headless machine (e.g. a rack mounted server) and the screen resolution cannot be determined. Note that is the barcode is generated in either of these situations and this method has not been called, the resolution is assumed to be 72 dots per inch.

Parameters:

resolution - The desired output resolution (in dots per inch)

getX

public int getX()

From JComponent.

Overrides:

getX in class JComponent

Returns:

The X co-ordinate of the component's origin

getY

public int getY()

From JComponent.

Overrides:

getY in class JComponent

Returns:

The Y co-ordinate of the component's origin

getWidth

public int getWidth()

From JComponent.

Overrides:

getWidth in class JComponent

Returns:

The width of this component

getHeight

public int getHeight()

From JComponent.

Overrides:

getHeight in class JComponent

Returns:

The height of this component

getBounds

public Rectangle getBounds()

From JComponent.

Overrides:

getBounds in class Component

Returns:

The bounds of this component

getBounds

public Rectangle getBounds(Rectangle rv)

From JComponent.

Overrides:

getBounds in class JComponent

Parameters:

rv - The rectangle to set the bounds on

Returns:

The updated rv

getPreferredSize

public Dimension getPreferredSize()

From JComponent.

Overrides:

getPreferredSize in class JComponent

Returns:

The preferred size of this component

getMinimumSize

public Dimension getMinimumSize()

From JComponent.

Overrides:

getMinimumSize in class JComponent

Returns:

The minimum size of this component

getMaximumSize

public Dimension getMaximumSize()

From JComponent.

Overrides:

getMaximumSize in class JComponent

Returns:

The maximum size of this component

getSize

public Dimension getSize()

From JComponent.

Overrides:

getSize in class Component

Returns:

The actual size of this component

draw

public void draw(Graphics2D g,
                 int x,
                 int y)
          throws OutputException

Renders this Barcode at the specified location in the specified Graphics2D context. The origin of the layout is placed at x, y. Rendering may touch any point within getBounds() of this position. This leaves the g2 unchanged.

Parameters:

g - The graphics context

x - The horizontal value of the upper left co-ordinate of the bounding box

y - The vertical value of the upper left co-ordinate of the bounding box

Throws:

OutputException

output

public void output(Output output)
            throws OutputException

Throws:

OutputException

encodeData

protected abstract Module[] encodeData()

calculateChecksum

protected abstract Module calculateChecksum()

getPreAmble

protected abstract Module getPreAmble()

getPostAmble

protected abstract Module getPostAmble()

draw

protected abstract Dimension draw(Output output,
                                  int x,
                                  int y,
                                  int barWidth,
                                  int barHeight)
                           throws OutputException

Throws:

OutputException

getLabel

public String getLabel()

Returns the text that will be displayed underneath the barcode (if requested).

Returns:

The text label for the barcode

setLabel

public void setLabel(String label)

Sets the human readable text to be displayed underneath the barcode. If set to null then the text will automaticaly be generated.

Parameters:

label - the human readable barcode text

See Also:

getLabel()

calculateMinimumBarHeight

protected int calculateMinimumBarHeight(int resolution)

paintComponent

protected void paintComponent(Graphics g)

From JComponent.

Overrides:

paintComponent in class JComponent

Parameters:

g - The graphics to paint the component onto

getResolution

protected int getResolution()

drawModule

protected int drawModule(Module module,
                         Output output,
                         int x,
                         int y,
                         int barWidth,
                         int barHeight)
                  throws OutputException

Throws:

OutputException

beautify

protected String beautify(String s)

print

public int print(Graphics g,
                 PageFormat pageFormat,
                 int pageIndex)
          throws PrinterException

Specified by:

print in interface Printable

Throws:

PrinterException

toString

public String toString()

Overrides:

toString in class Component