From a2be91ea289ddb1a8634c5fd252243f1b9ab7000 Mon Sep 17 00:00:00 2001
From: "sebastian.sellmair" <sebastian.sellmair@jetbrains.com>
Date: Mon, 17 Aug 2020 10:46:26 +0200
Subject: Implement SelfRepresentingSingletonSet and let `ContentSourceSet`
 conform to it

---
 .../kotlin/utilities/SelfRepresentingSingletonSet.kt   | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 core/src/main/kotlin/utilities/SelfRepresentingSingletonSet.kt

(limited to 'core/src/main/kotlin/utilities')

diff --git a/core/src/main/kotlin/utilities/SelfRepresentingSingletonSet.kt b/core/src/main/kotlin/utilities/SelfRepresentingSingletonSet.kt
new file mode 100644
index 00000000..d384bda4
--- /dev/null
+++ b/core/src/main/kotlin/utilities/SelfRepresentingSingletonSet.kt
@@ -0,0 +1,18 @@
+package org.jetbrains.dokka.utilities
+
+interface SelfRepresentingSingletonSet<T : SelfRepresentingSingletonSet<T>> : Set<T> {
+    override val size: Int get() = 1
+
+    override fun contains(element: T): Boolean = this == element
+
+    override fun containsAll(elements: Collection<T>): Boolean =
+        if (elements.isEmpty()) true
+        else elements.all { this == it }
+
+    override fun isEmpty(): Boolean = false
+
+    override fun iterator(): Iterator<T> = iterator {
+        @Suppress("UNCHECKED_CAST")
+        yield(this@SelfRepresentingSingletonSet as T)
+    }
+}
-- 
cgit