87 lines
2.2 KiB
Java
87 lines
2.2 KiB
Java
/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.zxing.qrcode.decoder;
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/**
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* <p>See ISO 18004:2006, 6.5.1. This enum encapsulates the four error correction levels
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* defined by the QR code standard.</p>
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*
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* @author Sean Owen
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*/
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public final class ErrorCorrectionLevel {
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// No, we can't use an enum here. J2ME doesn't support it.
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/**
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* L = ~7% correction
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*/
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public static final ErrorCorrectionLevel L = new ErrorCorrectionLevel(0, 0x01, "L");
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/**
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* M = ~15% correction
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*/
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public static final ErrorCorrectionLevel M = new ErrorCorrectionLevel(1, 0x00, "M");
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/**
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* Q = ~25% correction
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*/
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public static final ErrorCorrectionLevel Q = new ErrorCorrectionLevel(2, 0x03, "Q");
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/**
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* H = ~30% correction
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*/
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public static final ErrorCorrectionLevel H = new ErrorCorrectionLevel(3, 0x02, "H");
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private static final ErrorCorrectionLevel[] FOR_BITS = {M, L, H, Q};
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private final int ordinal;
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private final int bits;
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private final String name;
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private ErrorCorrectionLevel(int ordinal, int bits, String name) {
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this.ordinal = ordinal;
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this.bits = bits;
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this.name = name;
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}
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public int ordinal() {
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return ordinal;
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}
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public int getBits() {
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return bits;
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}
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public String getName() {
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return name;
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}
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public String toString() {
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return name;
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}
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/**
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* @param bits int containing the two bits encoding a QR Code's error correction level
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* @return ErrorCorrectionLevel representing the encoded error correction level
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*/
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public static ErrorCorrectionLevel forBits(int bits) {
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if (bits < 0 || bits >= FOR_BITS.length) {
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throw new IllegalArgumentException();
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}
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return FOR_BITS[bits];
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}
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}
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