com.google.zxing.oned
Class UPCAReader

java.lang.Object
  com.google.zxing.oned.UPCAReader

All Implemented Interfaces:

OneDReader, UPCEANReader, Reader

public final class UPCAReader
extends java.lang.Object
implements UPCEANReader

Implements decoding of the UPC-A format.

Author:

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

Constructor Summary

UPCAReader()

Method Summary

Result	decode(MonochromeBitmapSource image) Locates and decodes a barcode in some format within an image.
Result	decode(MonochromeBitmapSource image, java.util.Hashtable hints) Locates and decodes a barcode in some format within an image.
Result	decodeRow(int rowNumber, BitArray row, java.util.Hashtable hints) Attempts to decode a one-dimensional barcode format given a single row of an image.
Result	decodeRow(int rowNumber, BitArray row, int[] startGuardRange) Like OneDReader.decodeRow(int, BitArray, java.util.Hashtable), but allows caller to inform method about where the UPC/EAN start pattern is found.

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)
                 throws ReaderException

Description copied from interface: UPCEANReader

Like OneDReader.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:

ReaderException

decodeRow

public Result decodeRow(int rowNumber,
                        BitArray row,
                        java.util.Hashtable hints)
                 throws ReaderException

Description copied from interface: OneDReader

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

Specified by:

decodeRow in interface 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:

ReaderException - if an error occurs or barcode cannot be found

decode

public Result decode(MonochromeBitmapSource image)
              throws ReaderException

Description copied from interface: Reader

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

Specified by:

decode in interface Reader

Parameters:

image - image of barcode to decode

Returns:

String which the barcode encodes

Throws:

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

decode

public Result decode(MonochromeBitmapSource image,
                     java.util.Hashtable hints)
              throws ReaderException

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

Parameters:

image - image of barcode to decode

hints - passed as a Hashtable from DecodeHintType to aribtrary 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:

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