Merge pull request #86 from mr-max/patch-1

Allow getting MenuItems as Sequence

dsl/static/src/common/menuItemsSequences.kt

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2015 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.
+ */
+
+@file:JvmMultifileClass
+@file:JvmName("MenuItemsSequencesKt")
+package org.jetbrains.anko
+
+import android.view.Menu
+import android.view.MenuItem
+import java.util.*
+
+fun Menu.itemsSequence(): Sequence<MenuItem> = MenuItemsSequence(this)
+
+private class MenuItemsSequence(private val menu: Menu) : Sequence<MenuItem> {
+    override fun iterator(): Iterator<MenuItem> {
+        return MenuItemIterator(menu)
+    }
+
+    private class MenuItemIterator(private val menu: Menu) : Iterator<MenuItem> {
+        private var index = 0
+        private val count = menu.size()
+
+        override fun next(): MenuItem {
+            if (!hasNext()) {
+                throw NoSuchElementException()
+            }
+
+            return menu.getItem(index++)
+        }
+
+        override fun hasNext(): Boolean {
+            if (count != menu.size()) {
+                throw ConcurrentModificationException()
+            }
+
+            return index < count
+        }
+    }
+}