com.google.zxing.oned

Class UPCAReader

java.lang.Object

com.google.zxing.oned.OneDReader

com.google.zxing.oned.UPCEANReader

com.google.zxing.oned.UPCAReader

All Implemented Interfaces:

Reader

public final class UPCAReader
extends UPCEANReader

Implements decoding of the UPC-A format.

Author:

dswitkin@google.com (Daniel Switkin), Sean Owen

Field Summary

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

INTEGER_MATH_SHIFT, PATTERN_MATCH_RESULT_SCALE_FACTOR

Constructor Summary

Constructors

Constructor and Description
UPCAReader()

Method Summary

Methods

Modifier and Type	Method and Description
Result	decode(BinaryBitmap image) Locates and decodes a barcode in some format within an image.
Result	decode(BinaryBitmap image, Map<DecodeHintType,?> hints) Locates and decodes a barcode in some format within an image.
protected int	decodeMiddle(BitArray row, int[] startRange, StringBuilder 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, Map<DecodeHintType,?> hints) Like UPCEANReader.decodeRow(int, BitArray, java.util.Map), but allows caller to inform method about where the UPC/EAN start pattern is found.
Result	decodeRow(int rowNumber, BitArray row, Map<DecodeHintType,?> hints) Attempts to decode a one-dimensional barcode format given a single row of an image.

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

patternMatchVariance, recordPattern, recordPatternInReverse, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

UPCAReader

public UPCAReader()

Method Detail

decodeRow

public Result decodeRow(int rowNumber,
               BitArray row,
               int[] startGuardRange,
               Map<DecodeHintType,?> hints)
                 throws NotFoundException,
                        FormatException,
                        ChecksumException

Description copied from class: UPCEANReader

Like UPCEANReader.decodeRow(int, BitArray, java.util.Map), 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.

Overrides:

decodeRow in class UPCEANReader

Throws:

NotFoundException

FormatException

ChecksumException

decodeRow

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

Description copied from class: OneDReader

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

Overrides:

decodeRow in class UPCEANReader

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

FormatException

ChecksumException

decode

public Result decode(BinaryBitmap image)
              throws NotFoundException,
                     FormatException

Description copied from interface: Reader

Locates and decodes a barcode in some format within an image.

Specified by:

decode in interface Reader

Overrides:

decode in class OneDReader

Parameters:

image - image of barcode to decode

Returns:

String which the barcode encodes

Throws:

NotFoundException - if the barcode cannot be located or decoded for any reason

FormatException

decode

public Result decode(BinaryBitmap image,
            Map<DecodeHintType,?> hints)
              throws NotFoundException,
                     FormatException

Description copied from interface: Reader

Locates and decodes a barcode in some format within an image. This method also accepts hints, each possibly associated to some data, which may help the implementation decode.

Specified by:

decode in interface Reader

Overrides:

decode in class OneDReader

Parameters:

image - image of barcode to decode

hints - passed as a Map from DecodeHintType to arbitrary data. The meaning of the data depends upon the hint type. The implementation may or may not do anything with these hints.

Returns:

String which the barcode encodes

Throws:

NotFoundException - if the barcode cannot be located or decoded for any reason

FormatException

decodeMiddle

protected int decodeMiddle(BitArray row,
               int[] startRange,
               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