From d92f286903efda12acec74cc1b5e99687e5447aa Mon Sep 17 00:00:00 2001
From: Paweł Marks <pmarks@virtuslab.com>
Date: Mon, 24 Feb 2020 12:09:17 +0100
Subject: Adds calculated properties

---
 core/src/main/kotlin/model/properties/PropertyContainer.kt | 1 +
 core/src/main/kotlin/model/properties/properties.kt        | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/core/src/main/kotlin/model/properties/PropertyContainer.kt b/core/src/main/kotlin/model/properties/PropertyContainer.kt
index 1b854518..da351569 100644
--- a/core/src/main/kotlin/model/properties/PropertyContainer.kt
+++ b/core/src/main/kotlin/model/properties/PropertyContainer.kt
@@ -6,6 +6,7 @@ class PropertyContainer<C : Any> private constructor(
     operator fun <D : C> plus(prop: Property<D>): PropertyContainer<D> =
         PropertyContainer(map + (prop.key to prop))
 
+    // TODO: Add logic for caching calculated properties
     inline operator fun <reified T: Any> get(key: Property.Key<C, T>): T? = when (val prop = map[key]) {
         is T? -> prop
         else -> throw ClassCastException("Property for $key stored under not matching key type.")
diff --git a/core/src/main/kotlin/model/properties/properties.kt b/core/src/main/kotlin/model/properties/properties.kt
index b8965abc..5ff1305a 100644
--- a/core/src/main/kotlin/model/properties/properties.kt
+++ b/core/src/main/kotlin/model/properties/properties.kt
@@ -4,3 +4,7 @@ interface Property<in C : Any> {
     interface Key<in C: Any, T: Any>
     val key: Key<C, *>
 }
+
+interface CalculatedProperty<in C: Any, T: Any>: Property.Key<C, T> {
+    fun calculate(subject: C): T
+}
\ No newline at end of file
-- 
cgit