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QR-Code-generator
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Updated Javadoc and informal comments in Java code.

This commit is contained in:
Project Nayuki 2018-08-22 20:39:45 +00:00
parent bc372054e2
commit f5be9d38f6
2 changed files with 23 additions and 16 deletions
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2
java/io/nayuki/qrcodegen/BitBuffer.java
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@ -36,7 +36,7 @@ public final class BitBuffer implements Cloneable {
private BitSet data;
private int bitLength;
private int bitLength; // Non-negative

37
java/io/nayuki/qrcodegen/QrCode.java
View File

@ -49,7 +49,8 @@ public final class QrCode {
* @param ecl the error correction level to use (will be boosted)
* @return a QR Code representing the text
* @throws NullPointerException if the text or error correction level is {@code null}
* @throws IllegalArgumentException if the text fails to fit in the largest version QR Code, which means it is too long
* @throws IllegalArgumentException if the text fails to fit in the
* largest version QR Code at the ECL, which means it is too long
*/
public static QrCode encodeText(String text, Ecc ecl) {
Objects.requireNonNull(text);
@ -68,7 +69,8 @@ public final class QrCode {
* @param ecl the error correction level to use (will be boosted)
* @return a QR Code representing the binary data
* @throws NullPointerException if the data or error correction level is {@code null}
* @throws IllegalArgumentException if the data fails to fit in the largest version QR Code, which means it is too long
* @throws IllegalArgumentException if the data fails to fit in the
* largest version QR Code at the ECL, which means it is too long
*/
public static QrCode encodeBinary(byte[] data, Ecc ecl) {
Objects.requireNonNull(data);
@ -87,8 +89,9 @@ public final class QrCode {
* @param segs the segments to encode
* @param ecl the error correction level to use (will be boosted)
* @return a QR Code representing the segments
* @throws NullPointerException if the list of segments, a segment, or the error correction level is {@code null}
* @throws IllegalArgumentException if the data is too long to fit in the largest version QR Code at the ECL
* @throws NullPointerException if the list of segments, any segment, or the error correction level is {@code null}
* @throws IllegalArgumentException if the segments fail to fit in the
* largest version QR Code at the ECL, which means they are too long
*/
public static QrCode encodeSegments(List<QrSegment> segs, Ecc ecl) {
return encodeSegments(segs, ecl, MIN_VERSION, MAX_VERSION, -1, true);
@ -108,9 +111,10 @@ public final class QrCode {
* @param mask the mask pattern to use, which is either -1 for automatic choice or from 0 to 7 for fixed choice
* @param boostEcl increases the error correction level if it can be done without increasing the version number
* @return a QR Code representing the segments
* @throws NullPointerException if the list of segments, a segment, or the error correction level is {@code null}
* @throws IllegalArgumentException if 1 &le; minVersion &le; maxVersion &le; 40 is violated, or if mask
* &lt; &minus;1 or mask > 7, or if the data is too long to fit in a QR Code at maxVersion at the ECL
* @throws NullPointerException if the list of segments, any segment, or the error correction level is {@code null}
* @throws IllegalArgumentException if 1 &le; minVersion &le; maxVersion &le; 40
* is violated, or if mask &lt; &minus;1 or mask > 7, or if the segments fail
* to fit in the maxVersion QR Code at the ECL, which means they are too long
*/
public static QrCode encodeSegments(List<QrSegment> segs, Ecc ecl, int minVersion, int maxVersion, int mask, boolean boostEcl) {
Objects.requireNonNull(segs);
@ -197,13 +201,14 @@ public final class QrCode {
/**
* Constructs a QR Code symbol with the specified version number, error correction level, binary data array, and mask number.
* <p>This is a cumbersome low-level constructor that should not be invoked directly by the user.
* To go one level up, see the {@link #encodeSegments(List,Ecc)} function.</p>
* To go one level up, see the {@link #encodeSegments(List,Ecc,int,int,int,boolean)} function.</p>
* @param ver the version number to use, which must be in the range 1 to 40, inclusive
* @param ecl the error correction level to use
* @param dataCodewords the raw binary user data to encode
* @param mask the mask pattern to use, which is either -1 for automatic choice or from 0 to 7 for fixed choice
* @param dataCodewords the bytes representing segments to encode (without ECC)
* @param mask the mask pattern to use, which is either &minus;1 for automatic choice or from 0 to 7 for fixed choice
* @throws NullPointerException if the byte array or error correction level is {@code null}
* @throws IllegalArgumentException if the version or mask value is out of range
* @throws IllegalArgumentException if the version or mask value is out of range,
* or if the data is the wrong length for the specified version and error correction level
*/
public QrCode(int ver, Ecc ecl, byte[] dataCodewords, int mask) {
// Check arguments
@ -251,7 +256,8 @@ public final class QrCode {
* @param scale the module scale factor, which must be positive
* @param border the number of border modules to add, which must be non-negative
* @return an image representing this QR Code, with padding and scaling
* @throws IllegalArgumentException if the scale or border is out of range
* @throws IllegalArgumentException if the scale or border is out of range, or if
* {scale, border, size} cause the image dimensions to exceed Integer.MAX_VALUE
*/
public BufferedImage toImage(int scale, int border) {
if (scale <= 0 || border < 0)
@ -276,6 +282,7 @@ public final class QrCode {
* Note that Unix newlines (\n) are always used, regardless of the platform.
* @param border the number of border modules to add, which must be non-negative
* @return a string representing this QR Code as an SVG document
* @throws IllegalArgumentException if the border is negative
*/
public String toSvgString(int border) {
if (border < 0)
@ -526,7 +533,7 @@ public final class QrCode {
}
// A messy helper function for the constructors. This QR Code must be in an unmasked state when this
// A messy helper function for the constructor. This QR Code must be in an unmasked state when this
// method is called. The given argument is the requested mask, which is -1 for auto or 0 to 7 for fixed.
// This method applies and returns the actual mask chosen, from 0 to 7.
private int handleConstructorMasking(int mask) {
@ -672,7 +679,7 @@ public final class QrCode {
int result = size * size; // Number of modules in the whole QR symbol square
result -= 8 * 8 * 3; // Subtract the three finders with separators
result -= 15 * 2 + 1; // Subtract the format information and black module
result -= (size - 16) * 2; // Subtract the timing patterns
result -= (size - 16) * 2; // Subtract the timing patterns (excluding finders)
// The five lines above are equivalent to: int result = (16 * ver + 128) * ver + 64;
if (ver >= 2) {
int numAlign = ver / 7 + 2;
@ -763,7 +770,7 @@ public final class QrCode {
*/
private static final class ReedSolomonGenerator {
/*-- Immutable field --*/
/*-- Field --*/
// Coefficients of the divisor polynomial, stored from highest to lowest power, excluding the leading term which
// is always 1. For example the polynomial x^3 + 255x^2 + 8x + 93 is stored as the uint8 array {255, 8, 93}.