Package com.google.zxing.qrcode.encoder

Class Encoder

java.lang.Object

com.google.zxing.qrcode.encoder.Encoder

public final class Encoder
extends Object

Author:

satorux@google.com (Satoru Takabayashi) - creator, dswitkin@google.com (Daniel Switkin) - ported from C++

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final String	DEFAULT_BYTE_MODE_ENCODING

Method Summary

Modifier and Type	Method	Description
(package private) static void	append8BitBytes(String content, BitArray bits, String encoding)
(package private) static void	appendAlphanumericBytes(CharSequence content, BitArray bits)
(package private) static void	appendBytes(String content, Mode mode, BitArray bits, String encoding)	Append "bytes" in "mode" mode (encoding) into "bits".
(package private) static void	appendKanjiBytes(String content, BitArray bits)
(package private) static void	appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits)	Append length info.
(package private) static void	appendModeInfo(Mode mode, BitArray bits)	Append mode info.
(package private) static void	appendNumericBytes(CharSequence content, BitArray bits)
static Mode	chooseMode(String content)
static QRCode	encode(String content, ErrorCorrectionLevel ecLevel)
static QRCode	encode(String content, ErrorCorrectionLevel ecLevel, Map<EncodeHintType,?> hints)
(package private) static byte[]	generateECBytes(byte[] dataBytes, int numEcBytesInBlock)
(package private) static int	getAlphanumericCode(int code)
(package private) static void	getNumDataBytesAndNumECBytesForBlockID(int numTotalBytes, int numDataBytes, int numRSBlocks, int blockID, int[] numDataBytesInBlock, int[] numECBytesInBlock)	Get number of data bytes and number of error correction bytes for block id "blockID".
(package private) static BitArray	interleaveWithECBytes(BitArray bits, int numTotalBytes, int numDataBytes, int numRSBlocks)	Interleave "bits" with corresponding error correction bytes.
(package private) static void	terminateBits(int numDataBytes, BitArray bits)	Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_BYTE_MODE_ENCODING

static final String DEFAULT_BYTE_MODE_ENCODING

See Also:

• Constant Field Values

Method Details

encode

public static QRCode encode(String content,
 ErrorCorrectionLevel ecLevel)
                     throws WriterException

Parameters:

content - text to encode

ecLevel - error correction level to use

Returns:

QRCode representing the encoded QR code

Throws:

WriterException - if encoding can't succeed, because of for example invalid content or configuration

encode

public static QRCode encode(String content,
 ErrorCorrectionLevel ecLevel,
 Map<EncodeHintType,?> hints)
                     throws WriterException

Throws:

WriterException

getAlphanumericCode

static int getAlphanumericCode(int code)

Returns:

the code point of the table used in alphanumeric mode or -1 if there is no corresponding code in the table.

chooseMode

public static Mode chooseMode(String content)

terminateBits

static void terminateBits(int numDataBytes,
 BitArray bits)
                   throws WriterException

Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).

Throws:

WriterException

getNumDataBytesAndNumECBytesForBlockID

static void getNumDataBytesAndNumECBytesForBlockID(int numTotalBytes,
 int numDataBytes,
 int numRSBlocks,
 int blockID,
 int[] numDataBytesInBlock,
 int[] numECBytesInBlock)
                                            throws WriterException

Get number of data bytes and number of error correction bytes for block id "blockID". Store the result in "numDataBytesInBlock", and "numECBytesInBlock". See table 12 in 8.5.1 of JISX0510:2004 (p.30)

Throws:

WriterException

interleaveWithECBytes

static BitArray interleaveWithECBytes(BitArray bits,
 int numTotalBytes,
 int numDataBytes,
 int numRSBlocks)
                               throws WriterException

Interleave "bits" with corresponding error correction bytes. On success, store the result in "result". The interleave rule is complicated. See 8.6 of JISX0510:2004 (p.37) for details.

Throws:

WriterException

generateECBytes

static byte[] generateECBytes(byte[] dataBytes,
 int numEcBytesInBlock)

appendModeInfo

static void appendModeInfo(Mode mode,
 BitArray bits)

Append mode info. On success, store the result in "bits".

appendLengthInfo

static void appendLengthInfo(int numLetters,
 Version version,
 Mode mode,
 BitArray bits)
                      throws WriterException

Append length info. On success, store the result in "bits".

Throws:

WriterException

appendBytes

static void appendBytes(String content,
 Mode mode,
 BitArray bits,
 String encoding)
                 throws WriterException

Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".

Throws:

WriterException

appendNumericBytes

static void appendNumericBytes(CharSequence content,
 BitArray bits)

appendAlphanumericBytes

static void appendAlphanumericBytes(CharSequence content,
 BitArray bits)
                             throws WriterException

Throws:

WriterException

append8BitBytes

static void append8BitBytes(String content,
 BitArray bits,
 String encoding)
                     throws WriterException

Throws:

WriterException

appendKanjiBytes

static void appendKanjiBytes(String content,
 BitArray bits)
                      throws WriterException

Throws:

WriterException