Split out common code into multiplatform Kotlin library

1 files changed, 40 insertions, 0 deletions

diff --git a/taler-kotlin-android/src/main/java/net/taler/common/SignedAmount.kt b/taler-kotlin-android/src/main/java/net/taler/common/SignedAmount.kt
new file mode 100644
index 0000000..03a0d6e
--- /dev/null
+++ b/taler-kotlin-android/src/main/java/net/taler/common/SignedAmount.kt
@@ -0,0 +1,40 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.common
+
+import android.annotation.SuppressLint
+
+data class SignedAmount(
+    val positive: Boolean,
+    val amount: Amount
+) {
+
+    companion object {
+        @Throws(AmountParserException::class)
+        @SuppressLint("CheckedExceptions")
+        fun fromJSONString(str: String): SignedAmount = when (str.substring(0, 1)) {
+            "-" -> SignedAmount(false, Amount.fromJSONString(str.substring(1)))
+            "+" -> SignedAmount(true, Amount.fromJSONString(str.substring(1)))
+            else -> SignedAmount(true, Amount.fromJSONString(str))
+        }
+    }
+
+    override fun toString(): String {
+        return if (positive) "$amount" else "-$amount"
+    }
+
+}
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