From 36dd874c27c241e20615079d1757b78a6761926a Mon Sep 17 00:00:00 2001
From: Andrey Breslav <andrey.breslav@jetbrains.com>
Date: Tue, 19 Nov 2013 15:21:01 +0400
Subject: [PATCH] coreLib and Java collections utilities

---
 .../src/org/jetbrains/jet/utils/coreLib.kt    | 24 +++++++++++++++++++
 .../jetbrains/jet/utils/javaCollections.kt    | 10 ++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt
 create mode 100644 core/util.runtime/src/org/jetbrains/jet/utils/javaCollections.kt

diff --git a/core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt b/core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt
new file mode 100644
index 00000000000..5a4922cabc3
--- /dev/null
+++ b/core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2013 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.util
+
+fun Boolean.iif<T>(then: T, _else: T): T = if (this) then else _else
+
+// These two functions are needed in conjunction with iif:
+// foo.eq(bar).iif(a, b)
+fun <T> T.eq(eq: T): Boolean = this == eq
+fun <T> T.neq(eq: T): Boolean = this != eq
\ No newline at end of file
diff --git a/core/util.runtime/src/org/jetbrains/jet/utils/javaCollections.kt b/core/util.runtime/src/org/jetbrains/jet/utils/javaCollections.kt
new file mode 100644
index 00000000000..8d0f37b6eb6
--- /dev/null
+++ b/core/util.runtime/src/org/jetbrains/jet/utils/javaCollections.kt
@@ -0,0 +1,10 @@
+package org.jetbrains.jet.utils
+
+import java.util.Collections
+
+public fun <T> emptyList(): MutableList<T> = Collections.emptyList<T>() as MutableList
+public fun <T: Any> emptyOrSingletonList(item: T?): MutableList<T> = if (item == null) emptyList() else Collections.singletonList(item) as MutableList
+
+public fun <T> emptySet(): MutableSet<T> = Collections.emptySet<T>() as MutableSet
+public fun <K, V> emptyMap(): MutableMap<K, V> = Collections.emptyMap<K, V>() as MutableMap
+