Kotlin conversion: QR (#1389)

mifospay/src/main/java/org/mifos/mobilewallet/mifospay/qr/QrContract.kt

@@ -0,0 +1,21 @@
+package org.mifos.mobilewallet.mifospay.qr
+
+import android.graphics.Bitmap
+import org.mifos.mobilewallet.mifospay.base.BasePresenter
+import org.mifos.mobilewallet.mifospay.base.BaseView
+
+/**
+ * Created by naman on 8/7/17.
+ */
+interface QrContract {
+    interface ShowQrView : BaseView<ShowQrPresenter?> {
+        fun showGeneratedQr(bitmap: Bitmap?)
+    }
+
+    interface ShowQrPresenter : BasePresenter {
+        fun generateQr(data: String?)
+    }
+
+    interface ReadQrView : BaseView<ReadQrPresenter?>
+    interface ReadQrPresenter : BasePresenter
+}

mifospay/src/main/java/org/mifos/mobilewallet/mifospay/qr/domain/usecase/GenerateQr.kt

@@ -0,0 +1,62 @@
+package org.mifos.mobilewallet.mifospay.qr.domain.usecase
+
+import android.graphics.Bitmap
+import com.google.zxing.BarcodeFormat
+import com.google.zxing.MultiFormatWriter
+import com.google.zxing.WriterException
+import com.google.zxing.common.BitMatrix
+import org.mifos.mobilewallet.core.base.UseCase
+import org.mifos.mobilewallet.mifospay.utils.Constants
+import javax.inject.Inject
+
+/**
+ * Created by naman on 8/7/17.
+ */
+class GenerateQr @Inject constructor() :
+    UseCase<GenerateQr.RequestValues, GenerateQr.ResponseValue?>() {
+    override fun executeUseCase(requestValues: RequestValues) {
+        try {
+            val bitmap = encodeAsBitmap(requestValues.data)
+            if (bitmap != null) {
+                useCaseCallback.onSuccess(ResponseValue(bitmap))
+            } else {
+                useCaseCallback.onError(Constants.ERROR_OCCURRED)
+            }
+        } catch (e: WriterException) {
+            useCaseCallback.onError(Constants.FAILED_TO_WRITE_DATA_TO_QR)
+        }
+    }
+
+    @Throws(WriterException::class)
+    private fun encodeAsBitmap(str: String): Bitmap? {
+        val result: BitMatrix
+        result = try {
+            MultiFormatWriter().encode(
+                str,
+                BarcodeFormat.QR_CODE, WIDTH, WIDTH, null
+            )
+        } catch (iae: IllegalArgumentException) {
+            return null
+        }
+        val w = result.width
+        val h = result.height
+        val pixels = IntArray(w * h)
+        for (y in 0 until h) {
+            val offset = y * w
+            for (x in 0 until w) {
+                pixels[offset + x] = if (result[x, y]) BLACK else WHITE
+            }
+        }
+        val bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888)
+        bitmap.setPixels(pixels, 0, WIDTH, 0, 0, w, h)
+        return bitmap
+    }
+
+    class RequestValues(val data: String) : UseCase.RequestValues
+    class ResponseValue(val bitmap: Bitmap) : UseCase.ResponseValue
+    companion object {
+        private const val WHITE = -0x1
+        private const val BLACK = -0x1000000
+        private const val WIDTH = 500
+    }
+}

mifospay/src/main/java/org/mifos/mobilewallet/mifospay/qr/presenter/ReadQrPresenter.kt

@@ -0,0 +1,19 @@
+package org.mifos.mobilewallet.mifospay.qr.presenter
+
+import org.mifos.mobilewallet.core.base.UseCaseHandler
+import org.mifos.mobilewallet.mifospay.base.BaseView
+import org.mifos.mobilewallet.mifospay.qr.QrContract
+import org.mifos.mobilewallet.mifospay.qr.QrContract.ReadQrView
+import javax.inject.Inject
+
+/**
+ * Created by naman on 7/9/17.
+ */
+class ReadQrPresenter @Inject constructor(private val mUsecaseHandler: UseCaseHandler) :
+    QrContract.ReadQrPresenter {
+    private var mReadQrView: ReadQrView? = null
+    override fun attachView(baseView: BaseView<*>?) {
+        mReadQrView = baseView as ReadQrView?
+        mReadQrView!!.setPresenter(this)
+    }
+}

mifospay/src/main/java/org/mifos/mobilewallet/mifospay/qr/presenter/ShowQrPresenter.kt

@@ -0,0 +1,36 @@
+package org.mifos.mobilewallet.mifospay.qr.presenter
+
+import org.mifos.mobilewallet.core.base.UseCase.UseCaseCallback
+import org.mifos.mobilewallet.core.base.UseCaseHandler
+import org.mifos.mobilewallet.mifospay.base.BaseView
+import org.mifos.mobilewallet.mifospay.qr.QrContract
+import org.mifos.mobilewallet.mifospay.qr.QrContract.ShowQrView
+import org.mifos.mobilewallet.mifospay.qr.domain.usecase.GenerateQr
+import javax.inject.Inject
+
+/**
+ * Created by naman on 8/7/17.
+ */
+class ShowQrPresenter @Inject constructor(private val mUsecaseHandler: UseCaseHandler) :
+    QrContract.ShowQrPresenter {
+    private lateinit var generateQrUseCase: GenerateQr
+    private lateinit var mShowQrView: ShowQrView
+    override fun attachView(baseView: BaseView<*>?) {
+        mShowQrView = baseView as ShowQrView
+        mShowQrView.setPresenter(this)
+    }
+
+    override fun generateQr(data: String?) {
+        mUsecaseHandler.execute(
+            generateQrUseCase, data?.let { GenerateQr.RequestValues(it) },
+            object : UseCaseCallback<GenerateQr.ResponseValue?> {
+                override fun onSuccess(response: GenerateQr.ResponseValue?) {
+                    if (response != null) {
+                        mShowQrView.showGeneratedQr(response.bitmap)
+                    }
+                }
+
+                override fun onError(message: String) {}
+            })
+    }
+}