Revert "Revert "[AppsFilter] read-only interface for snapshots""

This reverts commit 2e06c6008e595b9b167f3463431d9dcdb16687bb.

Reason for revert: fixing the boot time regression

Provides a read-only interface that is used by computer and snapshots.
It fixes the data conflicts when AppsFilter is changed while a snapshot is
taken.

Test: atest AppsFilterTest
Test: atest com.android.server.utils.WatcherTest
Test: m RUN_ERROR_PRONE=true framework services.core |& grep AppsFilter
BUG: 218411030
Change-Id: I06624ea79ff85160488a6c7863213b0c44fe2154

1 files changed, 20 insertions, 1 deletions

diff --git a/core/java/android/util/SparseSetArray.java b/core/java/android/util/SparseSetArray.java
index f5025f7a9e99..f85280f0264b 100644
--- a/core/java/android/util/SparseSetArray.java
+++ b/core/java/android/util/SparseSetArray.java
@@ -15,15 +15,34 @@
  */
 package android.util;
 
+import android.annotation.NonNull;
+
 /**
  * A sparse array of ArraySets, which is suitable to hold userid->packages association.
  *
  * @hide
  */
 public class SparseSetArray<T> {
-    private final SparseArray<ArraySet<T>> mData = new SparseArray<>();
+    private final SparseArray<ArraySet<T>> mData;
 
     public SparseSetArray() {
+        mData = new SparseArray<>();
+    }
+
+    /**
+     * Copy constructor
+     */
+    public SparseSetArray(@NonNull SparseSetArray<T> src) {
+        final int arraySize = src.size();
+        mData = new SparseArray<>(arraySize);
+        for (int i = 0; i < arraySize; i++) {
+            final int key = src.keyAt(i);
+            final ArraySet<T> set = src.get(key);
+            final int setSize = set.size();
+            for (int j = 0; j < setSize; j++) {
+                add(key, set.valueAt(j));
+            }
+        }
     }
 
     /**