Fixing potential ConcurrentModificationException

mBgDeepShortcutMap is only accessed on the background thread. But
the same instance of list of values was getting passed to the UI
thread, instead of being cloned.

Change-Id: Ie7d0442d895304489ce9323ea872b9091d668ae5

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;
+    }
 }