From e337cd98c8594eb92e3a5c434743b21fa3097ecc Mon Sep 17 00:00:00 2001
From: InsanusMokrassar <ovsyannikov.alexey95@gmail.com>
Date: Wed, 17 Nov 2021 21:31:35 +0600
Subject: [PATCH] optional workaround

---
 CHANGELOG.md                                  |  1 +
 .../dev/inmo/micro_utils/common/Optional.kt   | 21 +++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 410ddfff15d..19db51c1b84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 * `Common`:
     * Ranges intersection functionality
+    * New type `Optional`
 * `Pagination`:
     * `Pagination` now extends `ClosedRange<Int>`
     * `Pagination` intersection functionality
diff --git a/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Optional.kt b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Optional.kt
index 82919cfc60c..a166434beb7 100644
--- a/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Optional.kt
+++ b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Optional.kt
@@ -50,3 +50,24 @@ fun <T> Optional<T>.onPresented(block: (T) -> Unit): Optional<T> = apply {
 fun <T> Optional<T>.onAbsent(block: () -> Unit): Optional<T> = apply {
     if (!dataPresented) { block() }
 }
+
+/**
+ * Returns [Optional.data] if [Optional.dataPresented] of [this] is true, or null otherwise
+ */
+fun <T> Optional<T>.dataOrNull() = if (dataPresented) data as T else null
+
+/**
+ * Returns [Optional.data] if [Optional.dataPresented] of [this] is true, or throw [throwable] otherwise
+ */
+fun <T> Optional<T>.dataOrThrow(throwable: Throwable) = if (dataPresented) data as T else throw throwable
+
+
+/**
+ * Returns [Optional.data] if [Optional.dataPresented] of [this] is true, or call [block] and returns the result of it
+ */
+fun <T> Optional<T>.dataOrElse(block: () -> T) = if (dataPresented) data as T else block()
+
+/**
+ * Returns [Optional.data] if [Optional.dataPresented] of [this] is true, or call [block] and returns the result of it
+ */
+suspend fun <T> Optional<T>.dataOrElseSuspendable(block: suspend () -> T) = if (dataPresented) data as T else block()