Package com.google.zxing.aztec.decoder

Class Decoder

java.lang.Object

com.google.zxing.aztec.decoder.Decoder

public final class Decoder
extends java.lang.Object

The main class which implements Aztec Code decoding -- as opposed to locating and extracting the Aztec Code from an image.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	Decoder.CorrectedBitsResult
private static class	Decoder.Table

Field Summary

Fields

Modifier and Type	Field	Description
private AztecDetectorResult	ddata
private static java.nio.charset.Charset	DEFAULT_ENCODING
private static java.lang.String[]	DIGIT_TABLE
private static java.lang.String[]	LOWER_TABLE
private static java.lang.String[]	MIXED_TABLE
private static java.lang.String[]	PUNCT_TABLE
private static java.lang.String[]	UPPER_TABLE

Constructor Summary

Constructors

Constructor	Description
Decoder()

Method Summary

Modifier and Type	Method	Description
(package private) static byte[]	convertBoolArrayToByteArray(boolean[] boolArr)	Packs a bit array into bytes, most significant bit first
private Decoder.CorrectedBitsResult	correctBits(boolean[] rawbits)	Performs RS error correction on an array of bits.
DecoderResult	decode(AztecDetectorResult detectorResult)
private boolean[]	extractBits(BitMatrix matrix)	Gets the array of bits from an Aztec Code matrix
private static java.lang.String	getCharacter(Decoder.Table table, int code)	Gets the character (or string) corresponding to the passed code in the given table
private static java.lang.String	getEncodedData(boolean[] correctedBits)	Gets the string encoded in the aztec code bits
private static Decoder.Table	getTable(char t)	gets the table corresponding to the char passed
static java.lang.String	highLevelDecode(boolean[] correctedBits)
private static byte	readByte(boolean[] rawbits, int startIndex)	Reads a code of length 8 in an array of bits, padding with zeros
private static int	readCode(boolean[] rawbits, int startIndex, int length)	Reads a code of given length and at given index in an array of bits
private static int	totalBitsInLayer(int layers, boolean compact)

Methods inherited from class java.lang.Object

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

Field Detail

UPPER_TABLE

private static final java.lang.String[] UPPER_TABLE

LOWER_TABLE

private static final java.lang.String[] LOWER_TABLE

MIXED_TABLE

private static final java.lang.String[] MIXED_TABLE

PUNCT_TABLE

private static final java.lang.String[] PUNCT_TABLE

DIGIT_TABLE

private static final java.lang.String[] DIGIT_TABLE

DEFAULT_ENCODING

private static final java.nio.charset.Charset DEFAULT_ENCODING

ddata

private AztecDetectorResult ddata

Constructor Detail

Decoder

public Decoder()

Method Detail

decode

public DecoderResult decode(AztecDetectorResult detectorResult)
                     throws FormatException

Throws:

FormatException

highLevelDecode

public static java.lang.String highLevelDecode(boolean[] correctedBits)
                                        throws FormatException

Throws:

FormatException

getEncodedData

private static java.lang.String getEncodedData(boolean[] correctedBits)
                                        throws FormatException

Gets the string encoded in the aztec code bits

Returns:

the decoded string

Throws:

FormatException

getTable

private static Decoder.Table getTable(char t)

gets the table corresponding to the char passed

getCharacter

private static java.lang.String getCharacter(Decoder.Table table,
                                             int code)

Gets the character (or string) corresponding to the passed code in the given table

Parameters:

table - the table used

code - the code of the character

correctBits

private Decoder.CorrectedBitsResult correctBits(boolean[] rawbits)
                                         throws FormatException

Performs RS error correction on an array of bits.

Returns:

the corrected array

Throws:

FormatException - if the input contains too many errors

extractBits

private boolean[] extractBits(BitMatrix matrix)

Gets the array of bits from an Aztec Code matrix

Returns:

the array of bits

readCode

private static int readCode(boolean[] rawbits,
                            int startIndex,
                            int length)

Reads a code of given length and at given index in an array of bits

readByte

private static byte readByte(boolean[] rawbits,
                             int startIndex)

Reads a code of length 8 in an array of bits, padding with zeros

convertBoolArrayToByteArray

static byte[] convertBoolArrayToByteArray(boolean[] boolArr)

Packs a bit array into bytes, most significant bit first

totalBitsInLayer

private static int totalBitsInLayer(int layers,
                                    boolean compact)