com.google.zxing.oned
Class AbstractUPCEANReader

java.lang.Object
  com.google.zxing.oned.AbstractOneDReader
      com.google.zxing.oned.AbstractUPCEANReader

All Implemented Interfaces:

OneDReader, UPCEANReader, Reader

Direct Known Subclasses:

EAN13Reader, EAN8Reader, UPCAReader, UPCEReader

public abstract class AbstractUPCEANReader
extends AbstractOneDReader
implements UPCEANReader

Encapsulates functionality and implementation that is common to UPC and EAN families of one-dimensional barcodes.

Since:

BlackBerry API 6.0.0

Field Summary

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

INTEGER_MATH_SHIFT, PATTERN_MATCH_RESULT_SCALE_FACTOR

Constructor Summary
protected	AbstractUPCEANReader()

Method Summary
protected abstract int	decodeMiddle(BitArray row, int[] startRange, StringBuffer resultString) Subclasses override this to decode the portion of a barcode between the start and end guard patterns.
Result	decodeRow(int rowNumber, BitArray row, int[] startGuardRange) Like AbstractUPCEANReader.decodeRow(int, BitArray, java.util.Hashtable), but allows caller to inform method about where the UPC/EAN start pattern is found.
Result	decodeRow(int rowNumber, BitArray row, int[] startGuardRange, Hashtable hints) Like AbstractUPCEANReader.decodeRow(int, BitArray, java.util.Hashtable), but allows caller to inform method about where the UPC/EAN start pattern is found.
Result	decodeRow(int rowNumber, BitArray row, Hashtable hints) Attempts to decode a one-dimensional barcode format given a single row of an image.

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

decode, decode, patternMatchVariance, recordPattern, recordPatternInReverse

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.zxing.Reader

decode, decode

Constructor Detail

AbstractUPCEANReader

protected AbstractUPCEANReader()

Since:

BlackBerry API 6.0.0

Method Detail

decodeRow

public Result decodeRow(int rowNumber,
                        BitArray row,
                        Hashtable hints)
                 throws NotFoundException,
                        ChecksumException,
                        FormatException

Description copied from class: AbstractOneDReader

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

Specified by:

decodeRow in interface OneDReader

Specified by:

decodeRow in class AbstractOneDReader

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 an error occurs or barcode cannot be found

ChecksumException

FormatException

Since:

BlackBerry API 6.0.0

decodeRow

public Result decodeRow(int rowNumber,
                        BitArray row,
                        int[] startGuardRange)
                 throws NotFoundException,
                        ChecksumException,
                        FormatException

Like AbstractUPCEANReader.decodeRow(int, BitArray, java.util.Hashtable), but allows caller to inform method about where the UPC/EAN start pattern is found. This allows this to be computed once and reused across many implementations.

Specified by:

decodeRow in interface UPCEANReader

Throws:

NotFoundException

ChecksumException

FormatException

Since:

BlackBerry API 6.0.0

decodeRow

public Result decodeRow(int rowNumber,
                        BitArray row,
                        int[] startGuardRange,
                        Hashtable hints)
                 throws NotFoundException,
                        ChecksumException,
                        FormatException

Like AbstractUPCEANReader.decodeRow(int, BitArray, java.util.Hashtable), but allows caller to inform method about where the UPC/EAN start pattern is found. This allows this to be computed once and reused across many implementations.

Throws:

NotFoundException

ChecksumException

FormatException

Since:

BlackBerry API 7.0.0

decodeMiddle

protected abstract int decodeMiddle(BitArray row,
                                    int[] startRange,
                                    StringBuffer resultString)
                             throws NotFoundException

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

Parameters:

row - row of black/white values to search

startRange - start/end offset of start guard pattern

resultString - StringBuffer 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

Since:

BlackBerry API 6.0.0