Package com.google.zxing.oned

Class EAN13Reader

java.lang.Object

com.google.zxing.oned.OneDReader

com.google.zxing.oned.UPCEANReader

com.google.zxing.oned.EAN13Reader

All Implemented Interfaces:

Reader

public final class EAN13Reader
extends UPCEANReader

Implements decoding of the EAN-13 format.

Field Summary

Fields

Modifier and Type	Field	Description
private int[]	decodeMiddleCounters
(package private) static int[]	FIRST_DIGIT_ENCODINGS

Fields inherited from class com.google.zxing.oned.UPCEANReader

END_PATTERN, L_AND_G_PATTERNS, L_PATTERNS, MIDDLE_PATTERN, START_END_PATTERN

Constructor Summary

Constructors

Constructor	Description
EAN13Reader()

Method Summary

Modifier and Type	Method	Description
protected int	decodeMiddle(BitArray row, int[] startRange, java.lang.StringBuilder resultString)	Subclasses override this to decode the portion of a barcode between the start and end guard patterns.
private static void	determineFirstDigit(java.lang.StringBuilder resultString, int lgPatternFound)	Based on pattern of odd-even ('L' and 'G') patterns used to encoded the explicitly-encoded digits in a barcode, determines the implicitly encoded first digit and adds it to the result string.
(package private) BarcodeFormat	getBarcodeFormat()	Get the format of this decoder.

Methods inherited from class com.google.zxing.oned.UPCEANReader

checkChecksum, checkStandardUPCEANChecksum, decodeDigit, decodeEnd, decodeRow, decodeRow, findGuardPattern, findStartGuardPattern, getStandardUPCEANChecksum

Methods inherited from class com.google.zxing.oned.OneDReader

decode, decode, patternMatchVariance, recordPattern, recordPatternInReverse, reset

Methods inherited from class java.lang.Object

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

Field Detail

FIRST_DIGIT_ENCODINGS

static final int[] FIRST_DIGIT_ENCODINGS

decodeMiddleCounters

private final int[] decodeMiddleCounters

Constructor Detail

EAN13Reader

public EAN13Reader()

Method Detail

decodeMiddle

protected int decodeMiddle(BitArray row,
                           int[] startRange,
                           java.lang.StringBuilder resultString)
                    throws NotFoundException

Description copied from class: UPCEANReader

Subclasses override this to decode the portion of a barcode between the start and end guard patterns.

Specified by:

decodeMiddle in class UPCEANReader

Parameters:

row - row of black/white values to search

startRange - start/end offset of start guard pattern

resultString - StringBuilder to append decoded chars to

Returns:

horizontal offset of first pixel after the "middle" that was decoded

Throws:

NotFoundException - if decoding could not complete successfully

getBarcodeFormat

BarcodeFormat getBarcodeFormat()

Description copied from class: UPCEANReader

Get the format of this decoder.

Specified by:

getBarcodeFormat in class UPCEANReader

Returns:

The 1D format.

determineFirstDigit

private static void determineFirstDigit(java.lang.StringBuilder resultString,
                                        int lgPatternFound)
                                 throws NotFoundException

Based on pattern of odd-even ('L' and 'G') patterns used to encoded the explicitly-encoded digits in a barcode, determines the implicitly encoded first digit and adds it to the result string.

Parameters:

resultString - string to insert decoded first digit into

lgPatternFound - int whose bits indicates the pattern of odd/even L/G patterns used to encode digits

Throws:

NotFoundException - if first digit cannot be determined