Backend: RecalculatingValue as a ReadOnlyProperty (#2151)

1 files changed, 14 insertions, 3 deletions

diff --git a/src/main/java/at/hannibal2/skyhanni/utils/RecalculatingValue.kt b/src/main/java/at/hannibal2/skyhanni/utils/RecalculatingValue.kt
index 76f0c0c94..6059ed662 100644
--- a/src/main/java/at/hannibal2/skyhanni/utils/RecalculatingValue.kt
+++ b/src/main/java/at/hannibal2/skyhanni/utils/RecalculatingValue.kt
@@ -1,17 +1,28 @@
 package at.hannibal2.skyhanni.utils
 
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
 import kotlin.time.Duration
 
-class RecalculatingValue<T>(private val expireTime: Duration, val calculation: () -> T) {
+class RecalculatingValue<T>(private val expireTime: Duration, private val calculation: () -> T) : ReadOnlyProperty<Any?, T> {
 
-    private var currentValue = calculation()
+    private var currentValue: Any? = UNINITIALIZED_VALUE
     private var lastAccessTime = SimpleTimeMark.farPast()
 
+    @Deprecated("use \"by RecalculatingValue\" instead")
     fun getValue(): T {
         if (lastAccessTime.passedSince() > expireTime) {
             currentValue = calculation()
             lastAccessTime = SimpleTimeMark.now()
         }
-        return currentValue
+        @Suppress("UNCHECKED_CAST")
+        return currentValue as T
+    }
+
+    @Suppress("DEPRECATION")
+    override fun getValue(thisRef: Any?, property: KProperty<*>): T = getValue()
+
+    companion object {
+        private val UNINITIALIZED_VALUE = Any()
     }
 }