1 files changed, 44 insertions, 0 deletions
diff --git a/fastadapter/src/main/kotlin/ca/allanwang/kau/adapters/AdapterUtils.kt b/fastadapter/src/main/kotlin/ca/allanwang/kau/adapters/AdapterUtils.kt
new file mode 100644
index 0000000..17fd09f
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+++ b/fastadapter/src/main/kotlin/ca/allanwang/kau/adapters/AdapterUtils.kt
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2018 Allan Wang
+ *
+ * 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 ca.allanwang.kau.adapters
+
+import com.mikepenz.fastadapter.FastAdapter
+import com.mikepenz.fastadapter.IAdapter
+import com.mikepenz.fastadapter.IAdapterExtension
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.select.SelectExtension
+
+/**
+ * Created by Allan Wang on 2017-11-08.
+ */
+
+/**
+ * Add kotlin's generic syntax to better support out types
+ */
+fun <Item : IItem<*, *>> fastAdapter(vararg adapter: IAdapter<out Item>) =
+    FastAdapter.with<Item, IAdapter<out Item>>(adapter.toList())!!
+
+inline fun <reified T : IAdapterExtension<Item>, Item : IItem<*, *>> FastAdapter<Item>.getExtension(): T? =
+    getExtension(T::class.java)
+
+/**
+ * Returns selection size, or -1 if selection is disabled
+ */
+inline val <Item : IItem<*, *>> IAdapter<Item>.selectionSize: Int
+    get() = fastAdapter.getExtension<SelectExtension<Item>, Item>()?.selections?.size ?: -1
+
+inline val <Item : IItem<*, *>> IAdapter<Item>.selectedItems: Set<Item>
+    get() = fastAdapter.getExtension<SelectExtension<Item>, Item>()?.selectedItems ?: emptySet()