Use a cache for Sones’ names

[Sone.git] / src / main / kotlin / net / pterodactylus / sone / utils / Memoize.kt

diff --git a/src/main/kotlin/net/pterodactylus/sone/utils/Memoize.kt b/src/main/kotlin/net/pterodactylus/sone/utils/Memoize.kt
new file mode 100644 (file)
index 0000000..bd67ae2
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/utils/Memoize.kt
@@ -0,0 +1,12 @@
+package net.pterodactylus.sone.utils
+
+class Memoize<in T, out R>(private val calc: (T) -> R) : (T) -> R {
+
+       private val values = mutableMapOf<T, R>()
+
+       override fun invoke(value: T) =
+                       values.getOrPut(value, { calc(value) })
+
+}
+
+fun <T, R> ((T) -> R).memoize(): (T) -> R = Memoize(this)