下面列出了怎么用com.google.zxing.qrcode.decoder.Mode的API类实例代码及写法，或者点击链接到github查看源代码。
/**
* 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 return {@link Mode#KANJI}.
*/
private static Mode chooseMode(String content, String encoding) {
if ("Shift_JIS".equals(encoding) && isOnlyDoubleByteKanji(content)) {
// Choose Kanji mode if all input are double-byte characters
return Mode.KANJI;
}
boolean hasNumeric = false;
boolean hasAlphanumeric = false;
for (int i = 0; i < content.length(); ++i) {
char c = content.charAt(i);
if (c >= '0' && c <= '9') {
hasNumeric = true;
} else if (getAlphanumericCode(c) != -1) {
hasAlphanumeric = true;
} else {
return Mode.BYTE;
}
}
if (hasAlphanumeric) {
return Mode.ALPHANUMERIC;
}
if (hasNumeric) {
return Mode.NUMERIC;
}
return Mode.BYTE;
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* 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 return {@link Mode#KANJI}.
*/
private static Mode chooseMode(String content, String encoding) {
if ("Shift_JIS".equals(encoding) && isOnlyDoubleByteKanji(content)) {
// Choose Kanji mode if all input are double-byte characters
return Mode.KANJI;
}
boolean hasNumeric = false;
boolean hasAlphanumeric = false;
for (int i = 0; i < content.length(); ++i) {
char c = content.charAt(i);
if (c >= '0' && c <= '9') {
hasNumeric = true;
} else if (getAlphanumericCode(c) != -1) {
hasAlphanumeric = true;
} else {
return Mode.BYTE;
}
}
if (hasAlphanumeric) {
return Mode.ALPHANUMERIC;
}
if (hasNumeric) {
return Mode.NUMERIC;
}
return Mode.BYTE;
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
private static void a(int i, ErrorCorrectionLevel errorcorrectionlevel, Mode mode, QRCode qrcode)
{
qrcode.setECLevel(errorcorrectionlevel);
qrcode.setMode(mode);
for (int j = 1; j <= 40; j++)
{
Version version = Version.getVersionForNumber(j);
int k = version.getTotalCodewords();
com.google.zxing.qrcode.decoder.Version.ECBlocks ecblocks = version.getECBlocksForLevel(errorcorrectionlevel);
int l = ecblocks.getTotalECCodewords();
int i1 = ecblocks.getNumBlocks();
int j1 = k - l;
if (j1 >= a(i, version, mode))
{
qrcode.setVersion(j);
qrcode.setNumTotalBytes(k);
qrcode.setNumDataBytes(j1);
qrcode.setNumRSBlocks(i1);
qrcode.setNumECBytes(l);
qrcode.setMatrixWidth(version.getDimensionForVersion());
return;
}
}
throw new WriterException("Cannot find proper rs block info (input data too big?)");
}
/**
* 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 return {@link Mode#KANJI}.
*/
private static Mode chooseMode(String content, String encoding) {
if ("Shift_JIS".equals(encoding)) {
// Choose Kanji mode if all input are double-byte characters
return isOnlyDoubleByteKanji(content) ? Mode.KANJI : Mode.BYTE;
}
boolean hasNumeric = false;
boolean hasAlphanumeric = false;
for (int i = 0; i < content.length(); ++i) {
char c = content.charAt(i);
if (c >= '0' && c <= '9') {
hasNumeric = true;
} else if (getAlphanumericCode(c) != -1) {
hasAlphanumeric = true;
} else {
return Mode.BYTE;
}
}
if (hasAlphanumeric) {
return Mode.ALPHANUMERIC;
}
if (hasNumeric) {
return Mode.NUMERIC;
}
return Mode.BYTE;
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* 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 return {@link Mode#KANJI}.
*/
private static Mode chooseMode(String content, String encoding) {
if ("Shift_JIS".equals(encoding) && isOnlyDoubleByteKanji(content)) {
// Choose Kanji mode if all input are double-byte characters
return Mode.KANJI;
}
boolean hasNumeric = false;
boolean hasAlphanumeric = false;
for (int i = 0; i < content.length(); ++i) {
char c = content.charAt(i);
if (c >= '0' && c <= '9') {
hasNumeric = true;
} else if (getAlphanumericCode(c) != -1) {
hasAlphanumeric = true;
} else {
return Mode.BYTE;
}
}
if (hasAlphanumeric) {
return Mode.ALPHANUMERIC;
}
if (hasNumeric) {
return Mode.NUMERIC;
}
return Mode.BYTE;
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* 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 return {@link Mode#KANJI}.
*/
private static Mode chooseMode(String content, String encoding) {
if ("Shift_JIS".equals(encoding)) {
// Choose Kanji mode if all input are double-byte characters
return isOnlyDoubleByteKanji(content) ? Mode.KANJI : Mode.BYTE;
}
boolean hasNumeric = false;
boolean hasAlphanumeric = false;
for (int i = 0; i < content.length(); ++i) {
char c = content.charAt(i);
if (c >= '0' && c <= '9') {
hasNumeric = true;
} else if (getAlphanumericCode(c) != -1) {
hasAlphanumeric = true;
} else {
return Mode.BYTE;
}
}
if (hasAlphanumeric) {
return Mode.ALPHANUMERIC;
}
if (hasNumeric) {
return Mode.NUMERIC;
}
return Mode.BYTE;
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
*/
static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* Append "bytes" in "mode" mode (encoding) into "bits". On success, store
* the result in "bits".
*/
static void appendBytes(String content, Mode mode, BitArray bits, String encoding) throws WriterException {
switch (mode) {
case NUMERIC:
appendNumericBytes(content, bits);
break;
case ALPHANUMERIC:
appendAlphanumericBytes(content, bits);
break;
case BYTE:
append8BitBytes(content, bits, encoding);
break;
case KANJI:
appendKanjiBytes(content, bits);
break;
default:
throw new WriterException("Invalid mode: " + mode);
}
}
/**
* 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
*/
private static Version recommendVersion(ErrorCorrectionLevel ecLevel,
Mode mode,
BitArray headerBits,
BitArray dataBits) throws WriterException {
// Hard part: need to know version to know how many bits length takes. But need to know how many
// bits it takes to know version. First we take a guess at version by assuming version will be
// the minimum, 1:
int provisionalBitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, Version.getVersionForNumber(1));
Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
// Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, provisionalVersion);
return chooseVersion(bitsNeeded, ecLevel);
}
/**
* Append length info. On success, store the result in "bits".
*/
static void appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits) throws WriterException {
int numBits = mode.getCharacterCountBits(version);
if (numLetters >= (1 << numBits)) {
throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
/**
* 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
*/
private static Version recommendVersion(ErrorCorrectionLevel ecLevel,
Mode mode,
BitArray headerBits,
BitArray dataBits) throws WriterException {
// Hard part: need to know version to know how many bits length takes. But need to know how many
// bits it takes to know version. First we take a guess at version by assuming version will be
// the minimum, 1:
int provisionalBitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, Version.getVersionForNumber(1));
Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
// Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, provisionalVersion);
return chooseVersion(bitsNeeded, ecLevel);
}
/**
* 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
*/
private static Version recommendVersion(ErrorCorrectionLevel ecLevel,
Mode mode,
BitArray headerBits,
BitArray dataBits) throws WriterException {
// Hard part: need to know version to know how many bits length takes. But need to know how many
// bits it takes to know version. First we take a guess at version by assuming version will be
// the minimum, 1:
int provisionalBitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, Version.getVersionForNumber(1));
Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
// Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, provisionalVersion);
return chooseVersion(bitsNeeded, ecLevel);
}
/**
* Append length info. On success, store the result in "bits".
*/
static void appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits) throws WriterException {
int numBits = mode.getCharacterCountBits(version);
if (numLetters >= (1 << numBits)) {
throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
/**
* Append length info. On success, store the result in "bits".
*/
static void appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits) throws WriterException {
int numBits = mode.getCharacterCountBits(version);
if (numLetters >= (1 << numBits)) {
throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
/**
* 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
*/
private static Version recommendVersion(ErrorCorrectionLevel ecLevel,
Mode mode,
BitArray headerBits,
BitArray dataBits) throws WriterException {
// Hard part: need to know version to know how many bits length takes. But need to know how many
// bits it takes to know version. First we take a guess at version by assuming version will be
// the minimum, 1:
int provisionalBitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, Version.getVersionForNumber(1));
Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
// Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, provisionalVersion);
return chooseVersion(bitsNeeded, ecLevel);
}
/**
* 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
*/
private static Version recommendVersion(ErrorCorrectionLevel ecLevel,
Mode mode,
BitArray headerBits,
BitArray dataBits) throws WriterException {
// Hard part: need to know version to know how many bits length takes. But need to know how many
// bits it takes to know version. First we take a guess at version by assuming version will be
// the minimum, 1:
int provisionalBitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, Version.getVersionForNumber(1));
Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
// Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, provisionalVersion);
return chooseVersion(bitsNeeded, ecLevel);
}
/**
* Append length info. On success, store the result in "bits".
*/
static void appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits) throws WriterException {
int numBits = mode.getCharacterCountBits(version);
if (numLetters >= (1 << numBits)) {
throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
/**
* 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
*/
private static Version recommendVersion(ErrorCorrectionLevel ecLevel,
Mode mode,
BitArray headerBits,
BitArray dataBits) throws WriterException {
// Hard part: need to know version to know how many bits length takes. But need to know how many
// bits it takes to know version. First we take a guess at version by assuming version will be
// the minimum, 1:
int provisionalBitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, Version.getVersionForNumber(1));
Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
// Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, provisionalVersion);
return chooseVersion(bitsNeeded, ecLevel);
}
/**
* Append length info. On success, store the result in "bits".
*/
static void appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits) throws WriterException {
int numBits = mode.getCharacterCountBits(version);
if (numLetters >= (1 << numBits)) {
throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
/**
* Append length info. On success, store the result in "bits".
*/
static void appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits) throws WriterException {
int numBits = mode.getCharacterCountBits(version);
if (numLetters >= (1 << numBits)) {
throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
public static Mode chooseMode(String s)
{
return a(s, ((String) (null)));
}
private static int calculateBitsNeeded(Mode mode,
BitArray headerBits,
BitArray dataBits,
Version version) {
return headerBits.getSize() + mode.getCharacterCountBits(version) + dataBits.getSize();
}
public static Mode chooseMode(String content) {
return chooseMode(content, null);
}