Package com.google.zxing.qrcode.encoder
Class Encoder
- java.lang.Object
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- com.google.zxing.qrcode.encoder.Encoder
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public final class Encoder extends java.lang.Object
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Field Summary
Fields Modifier and Type Field Description private static int[]
ALPHANUMERIC_TABLE
(package private) static java.nio.charset.Charset
DEFAULT_BYTE_MODE_ENCODING
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Constructor Summary
Constructors Modifier Constructor Description private
Encoder()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description (package private) static void
append8BitBytes(java.lang.String content, BitArray bits, java.nio.charset.Charset encoding)
(package private) static void
appendAlphanumericBytes(java.lang.CharSequence content, BitArray bits)
(package private) static void
appendBytes(java.lang.String content, Mode mode, BitArray bits, java.nio.charset.Charset encoding)
Append "bytes" in "mode" mode (encoding) into "bits".private static void
appendECI(CharacterSetECI eci, BitArray bits)
(package private) static void
appendKanjiBytes(java.lang.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(java.lang.CharSequence content, BitArray bits)
private static int
calculateBitsNeeded(Mode mode, BitArray headerBits, BitArray dataBits, Version version)
private static int
calculateMaskPenalty(ByteMatrix matrix)
private static int
chooseMaskPattern(BitArray bits, ErrorCorrectionLevel ecLevel, Version version, ByteMatrix matrix)
static Mode
chooseMode(java.lang.String content)
private static Mode
chooseMode(java.lang.String content, java.nio.charset.Charset encoding)
Choose the best mode by examining the content.private static Version
chooseVersion(int numInputBits, ErrorCorrectionLevel ecLevel)
static QRCode
encode(java.lang.String content, ErrorCorrectionLevel ecLevel)
static QRCode
encode(java.lang.String content, ErrorCorrectionLevel ecLevel, java.util.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 boolean
isOnlyDoubleByteKanji(java.lang.String content)
private static Version
recommendVersion(ErrorCorrectionLevel ecLevel, Mode mode, BitArray headerBits, BitArray dataBits)
Decides the smallest version of QR code that will contain all of the provided data.(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).(package private) static boolean
willFit(int numInputBits, Version version, ErrorCorrectionLevel ecLevel)
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Method Detail
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calculateMaskPenalty
private static int calculateMaskPenalty(ByteMatrix matrix)
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encode
public static QRCode encode(java.lang.String content, ErrorCorrectionLevel ecLevel) throws WriterException
- Parameters:
content
- text to encodeecLevel
- 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
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encode
public static QRCode encode(java.lang.String content, ErrorCorrectionLevel ecLevel, java.util.Map<EncodeHintType,?> hints) throws WriterException
- Throws:
WriterException
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recommendVersion
private static Version recommendVersion(ErrorCorrectionLevel ecLevel, Mode mode, BitArray headerBits, BitArray dataBits) throws WriterException
Decides the smallest version of QR code that will contain all of the provided data.- Throws:
WriterException
- if the data cannot fit in any version
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calculateBitsNeeded
private static int calculateBitsNeeded(Mode mode, BitArray headerBits, BitArray dataBits, Version version)
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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.
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chooseMode
public static Mode chooseMode(java.lang.String content)
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chooseMode
private static Mode chooseMode(java.lang.String content, java.nio.charset.Charset encoding)
Choose the best mode by examining the content. Note that 'encoding' is used as a hint; if it is Shift_JIS, and the input is only double-byte Kanji, then we returnMode.KANJI
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isOnlyDoubleByteKanji
static boolean isOnlyDoubleByteKanji(java.lang.String content)
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chooseMaskPattern
private static int chooseMaskPattern(BitArray bits, ErrorCorrectionLevel ecLevel, Version version, ByteMatrix matrix) throws WriterException
- Throws:
WriterException
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chooseVersion
private static Version chooseVersion(int numInputBits, ErrorCorrectionLevel ecLevel) throws WriterException
- Throws:
WriterException
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willFit
static boolean willFit(int numInputBits, Version version, ErrorCorrectionLevel ecLevel)
- Returns:
- true if the number of input bits will fit in a code with the specified version and error correction level.
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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
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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
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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
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generateECBytes
static byte[] generateECBytes(byte[] dataBytes, int numEcBytesInBlock)
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appendModeInfo
static void appendModeInfo(Mode mode, BitArray bits)
Append mode info. On success, store the result in "bits".
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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
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appendBytes
static void appendBytes(java.lang.String content, Mode mode, BitArray bits, java.nio.charset.Charset encoding) throws WriterException
Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".- Throws:
WriterException
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appendNumericBytes
static void appendNumericBytes(java.lang.CharSequence content, BitArray bits)
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appendAlphanumericBytes
static void appendAlphanumericBytes(java.lang.CharSequence content, BitArray bits) throws WriterException
- Throws:
WriterException
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append8BitBytes
static void append8BitBytes(java.lang.String content, BitArray bits, java.nio.charset.Charset encoding)
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appendKanjiBytes
static void appendKanjiBytes(java.lang.String content, BitArray bits) throws WriterException
- Throws:
WriterException
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appendECI
private static void appendECI(CharacterSetECI eci, BitArray bits)
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