Class CodaBarReader

java.lang.Object

com.google.zxing.oned.OneDReader

com.google.zxing.oned.CodaBarReader

All Implemented Interfaces:

Reader

public final class CodaBarReader
extends OneDReader

Decodes Codabar barcodes.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final char[]	ALPHABET
private static final String	ALPHABET_STRING
(package private) static final int[]	CHARACTER_ENCODINGS	These represent the encodings of characters, as patterns of wide and narrow bars.
private int	counterLength
private int[]	counters
private final StringBuilder	decodeRowResult
private static final float	MAX_ACCEPTABLE
private static final int	MIN_CHARACTER_LENGTH
private static final float	PADDING
private static final char[]	STARTEND_ENCODING

Constructor Summary

Constructors

Constructor	Description
CodaBarReader()

Method Summary

Modifier and Type	Method	Description
(package private) static boolean	arrayContains(char[] array, char key)
private void	counterAppend(int e)
Result	decodeRow(int rowNumber, BitArray row, Map<DecodeHintType, ?> hints)	Attempts to decode a one-dimensional barcode format given a single row of an image.
private int	findStartPattern()
private void	setCounters(BitArray row)	Records the size of all runs of white and black pixels, starting with white.
private int	toNarrowWidePattern(int position)
private void	validatePattern(int start)

Methods inherited from class OneDReader

decode, decode, patternMatchVariance, recordPattern, recordPatternInReverse, reset

Methods inherited from class Object

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

Field Details

MAX_ACCEPTABLE

private static final float MAX_ACCEPTABLE

See Also:

• Constant Field Values

PADDING

private static final float PADDING

See Also:

• Constant Field Values

ALPHABET_STRING

private static final String ALPHABET_STRING

See Also:

• Constant Field Values

ALPHABET

static final char[] ALPHABET

CHARACTER_ENCODINGS

static final int[] CHARACTER_ENCODINGS

These represent the encodings of characters, as patterns of wide and narrow bars. The 7 least-significant bits of each int correspond to the pattern of wide and narrow, with 1s representing "wide" and 0s representing narrow.

MIN_CHARACTER_LENGTH

private static final int MIN_CHARACTER_LENGTH

See Also:

• Constant Field Values

STARTEND_ENCODING

private static final char[] STARTEND_ENCODING

decodeRowResult

private final StringBuilder decodeRowResult

counters

private int[] counters

counterLength

private int counterLength

Constructor Details

CodaBarReader

public CodaBarReader()

Method Details

decodeRow

public Result decodeRow(int rowNumber,
 BitArray row,
 Map<DecodeHintType, ?> hints)
                 throws NotFoundException

Description copied from class: OneDReader

Attempts to decode a one-dimensional barcode format given a single row of an image.

Specified by:

decodeRow in class OneDReader

Parameters:

rowNumber - row number from top of the row

row - the black/white pixel data of the row

hints - decode hints

Returns:

Result containing encoded string and start/end of barcode

Throws:

NotFoundException - if no potential barcode is found

validatePattern

private void validatePattern(int start)
                      throws NotFoundException

Throws:

NotFoundException

setCounters

private void setCounters(BitArray row)
                  throws NotFoundException

Records the size of all runs of white and black pixels, starting with white. This is just like recordPattern, except it records all the counters, and uses our builtin "counters" member for storage.

Parameters:

row - row to count from

Throws:

NotFoundException

counterAppend

private void counterAppend(int e)

findStartPattern

private int findStartPattern()
                      throws NotFoundException

Throws:

NotFoundException

arrayContains

static boolean arrayContains(char[] array,
 char key)

toNarrowWidePattern

private int toNarrowWidePattern(int position)