CnDetectorProcessor

CnDetectorProcessor.kt

class CnDetectorProcessor(private val context: Context, private val onCnDetected: ((cn: String, checksum: String) -> Unit)) :
    Detector.Processor<TextBlock?> {
    private val pattern = Pattern.compile("^C?\\.?N?\\.? ?(\\d\\d\\d\\d\\d\\d)\\.(\\d) ?[0O]?\$")
    private var detected = false

    override fun release() {}

    override fun receiveDetections(detections: Detections<TextBlock?>) {
        detections.detectedItems.forEach { _, item ->
            if (detected) return
            item?.value?.let(::checkCn)
        }
    }

    private fun checkCn(rawCn: String) {
        val matcher = pattern.matcher(rawCn)
        if (matcher.matches()) {
            val cn = matcher.group(1)!!
            val checksum = matcher.group(2)!!
            onCnDetected.invoke(cn, checksum)
            detected = true
        }
    }

    fun restart() {
        detected = false
    }
}