/*
* Copyright 2009 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.multi.qrcode;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.NotFoundException;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.ResultMetadataType;
import com.google.zxing.ResultPoint;
import com.google.zxing.common.DecoderResult;
import com.google.zxing.common.DetectorResult;
import com.google.zxing.multi.MultipleBarcodeReader;
import com.google.zxing.multi.qrcode.detector.MultiDetector;
import com.google.zxing.qrcode.QRCodeReader;
import java.util.Hashtable;
import java.util.Vector;
/**
* This implementation can detect and decode multiple QR Codes in an image.
*
* @author Sean Owen
* @author Hannes Erven
*/
public final class QRCodeMultiReader extends QRCodeReader implements MultipleBarcodeReader {
private static final Result[] EMPTY_RESULT_ARRAY = new Result[0];
public Result[] decodeMultiple(BinaryBitmap image) throws NotFoundException {
return decodeMultiple(image, null);
}
public Result[] decodeMultiple(BinaryBitmap image, Hashtable hints) throws NotFoundException {
Vector results = new Vector();
DetectorResult[] detectorResult = new MultiDetector(image.getBlackMatrix()).detectMulti(hints);
for (int i = 0; i < detectorResult.length; i++) {
try {
DecoderResult decoderResult = getDecoder().decode(detectorResult[i].getBits());
ResultPoint[] points = detectorResult[i].getPoints();
Result result = new Result(decoderResult.getText(), decoderResult.getRawBytes(), points,
BarcodeFormat.QR_CODE);
if (decoderResult.getByteSegments() != null) {
result.putMetadata(ResultMetadataType.BYTE_SEGMENTS, decoderResult.getByteSegments());
}
if (decoderResult.getECLevel() != null) {
result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, decoderResult.getECLevel().toString());
}
results.addElement(result);
} catch (ReaderException re) {
// ignore and continue
}
}
if (results.isEmpty()) {
return EMPTY_RESULT_ARRAY;
} else {
Result[] resultArray = new Result[results.size()];
for (int i = 0; i < results.size(); i++) {
resultArray[i] = (Result) results.elementAt(i);
}
return resultArray;
}
}
}