1 files changed, 32 insertions, 0 deletions
diff --git a/src/com/android/launcher3/util/MultiHashMap.java b/src/com/android/launcher3/util/MultiHashMap.java
index f54ab8840..b7275c1f7 100644
--- a/src/com/android/launcher3/util/MultiHashMap.java
+++ b/src/com/android/launcher3/util/MultiHashMap.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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 com.android.launcher3.util;
 
 import java.util.ArrayList;
@@ -7,6 +23,13 @@ import java.util.HashMap;
  * A utility map from keys to an ArrayList of values.
  */
 public class MultiHashMap<K, V> extends HashMap<K, ArrayList<V>> {
+
+    public MultiHashMap() { }
+
+    public MultiHashMap(int size) {
+        super(size);
+    }
+
     public void addToList(K key, V value) {
         ArrayList<V> list = get(key);
         if (list == null) {
@@ -17,4 +40,13 @@ public class MultiHashMap<K, V> extends HashMap<K, ArrayList<V>> {
             list.add(value);
         }
     }
+
+    @Override
+    public MultiHashMap<K, V> clone() {
+        MultiHashMap<K, V> map = new MultiHashMap<>(size());
+        for (Entry<K, ArrayList<V>> entry : entrySet()) {
+            map.put(entry.getKey(), new ArrayList<V>(entry.getValue()));
+        }
+        return map;
+    }
 }