Add JVM and nonJVM Money implementation

src/jvmMain/kotlin/JvmMoney.kt

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2024 Kazimierz Pogoda / Xemantic
+ *
+ * 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.xemantic.ai.money
+
+import java.math.BigDecimal
+import kotlin.minus
+import kotlin.plus
+import kotlin.times
+
+public class JvmMoney(private val value: BigDecimal) : Money {
+
+  override fun plus(amount: Money): Money = JvmMoney(
+    value + (amount as JvmMoney).value
+  )
+
+  override fun minus(amount: Money): Money = JvmMoney(
+    value - (amount as JvmMoney).value
+  )
+
+  override fun times(amount: Money): Money = JvmMoney(
+    (value * (amount as JvmMoney).value).stripTrailingZeros()
+  )
+
+  override fun times(ratio: Money.Ratio): Money = JvmMoney(
+    (value * (ratio as JvmRatio).value).stripTrailingZeros()
+  )
+
+  override fun compareTo(
+    other: Money
+  ): Int = value.compareTo((other as JvmMoney).value)
+
+  override fun toString(): String {
+    return value.toPlainString()
+  }
+
+  override fun equals(
+    other: Any?
+  ): Boolean = (other != null)
+      && (other is JvmMoney)
+      && (value == other.value)
+
+  override fun hashCode(): Int = value.hashCode()
+
+  internal class JvmRatio(internal val value: BigDecimal) : Money.Ratio {
+
+    override fun times(amount: Money): Money = JvmMoney(
+      (value * (amount as JvmMoney).value).stripTrailingZeros()
+    )
+
+    override fun toString(): String {
+      return value.toPlainString()
+    }
+
+    override fun equals(
+      other: Any?
+    ): Boolean = (other != null)
+        && (other is JvmRatio)
+        && (value == other.value)
+
+    override fun hashCode(): Int = value.hashCode()
+
+  }
+
+}
+
+public actual fun Money(amount: String): Money = JvmMoney(
+  BigDecimal(amount).stripTrailingZeros()
+)
+
+@Suppress("ObjectPropertyName")
+private val _ZERO = JvmMoney(BigDecimal.ZERO)
+public actual val Money.Companion.ZERO: Money get() = _ZERO
+
+@Suppress("ObjectPropertyName")
+private val _ONE = JvmMoney(BigDecimal.ONE)
+public actual val Money.Companion.ONE: Money get() = _ONE
+
+public actual fun Money.Companion.Ratio(
+  value: String
+): Money.Ratio = JvmMoney.JvmRatio(
+  BigDecimal(value).stripTrailingZeros()
+)
+
+@Suppress("ObjectPropertyName")
+private val _RATIO_ONE = JvmMoney.JvmRatio(BigDecimal.ONE)
+public actual val Money.Ratio.Companion.ONE: Money.Ratio get() = _RATIO_ONE

src/nonJvmMain/kotlin/NonJvmMoney.kt

@@ -0,0 +1,97 @@
+/*
+ * Copyright 2024 Kazimierz Pogoda / Xemantic
+ *
+ * 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.xemantic.ai.money
+
+import com.ionspin.kotlin.bignum.decimal.BigDecimal
+
+public class NonJvmMoney(private val value: BigDecimal) : Money {
+
+  override fun plus(amount: Money): Money = NonJvmMoney(
+    value + (amount as NonJvmMoney).value
+  )
+
+  override fun minus(amount: Money): Money = NonJvmMoney(
+    value - (amount as NonJvmMoney).value
+  )
+
+  override fun times(amount: Money): Money = NonJvmMoney(
+    (value * (amount as NonJvmMoney).value)
+  )
+
+  override fun times(ratio: Money.Ratio): Money = NonJvmMoney(
+    (value * (ratio as NativeRatio).value)
+  )
+
+  override fun compareTo(
+    other: Money
+  ): Int = value.compareTo((other as NonJvmMoney).value)
+
+  override fun toString(): String {
+    return value.toPlainString()
+  }
+
+  override fun equals(
+    other: Any?
+  ): Boolean = (other != null)
+      && (other is NonJvmMoney)
+      && (value == other.value)
+
+  override fun hashCode(): Int = value.hashCode()
+
+  internal class NativeRatio(internal val value: BigDecimal) : Money.Ratio {
+
+    override fun times(amount: Money): Money = NonJvmMoney(
+      (value * (amount as NonJvmMoney).value)
+    )
+
+    override fun toString(): String {
+      return value.toPlainString()
+    }
+
+    override fun equals(
+      other: Any?
+    ): Boolean = (other != null)
+        && (other is NativeRatio)
+        && (value == other.value)
+
+    override fun hashCode(): Int = value.hashCode()
+
+  }
+
+}
+
+public actual fun Money(amount: String): Money = NonJvmMoney(
+  BigDecimal.parseString(amount)
+)
+
+@Suppress("ObjectPropertyName")
+private val _ZERO = NonJvmMoney(BigDecimal.ZERO)
+public actual val Money.Companion.ZERO: Money get() = _ZERO
+
+@Suppress("ObjectPropertyName")
+private val _ONE = NonJvmMoney(BigDecimal.ONE)
+public actual val Money.Companion.ONE: Money get() = _ONE
+
+public actual fun Money.Companion.Ratio(
+  value: String
+): Money.Ratio = NonJvmMoney.NativeRatio(
+  BigDecimal.parseString(value)
+)
+
+@Suppress("ObjectPropertyName")
+private val _RATIO_ONE = NonJvmMoney.NativeRatio(BigDecimal.ONE)
+public actual val Money.Ratio.Companion.ONE: Money.Ratio get() = _RATIO_ONE