Simplify State initialization w/ better semantics + improved Task security.
Also, reveal the illusion that we're restoring state in Files and Downloads.
Also, define a "PairedTask" class that guards calls to task methods
with checks against isDestroyed. This also let us make all of the tasks
static, so we get much narrower scope and tasks can even be moved to
their own files.
Change-Id: I6a9e8706e1ab1d1f43301e73dd9858a115a6baaf
diff --git a/src/com/android/documentsui/RestoreRootTask.java b/src/com/android/documentsui/RestoreRootTask.java
new file mode 100644
index 0000000..9048b9d
--- /dev/null
+++ b/src/com/android/documentsui/RestoreRootTask.java
@@ -0,0 +1,52 @@
+/*
+ * 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.documentsui;
+
+import android.net.Uri;
+import android.provider.DocumentsContract;
+import android.util.Log;
+
+import com.android.documentsui.model.RootInfo;
+
+final class RestoreRootTask extends PairedTask<BaseActivity, Void, RootInfo> {
+ private static final String TAG = "RestoreRootTask";
+
+ private final Uri mRootUri;
+
+ public RestoreRootTask(BaseActivity activity, Uri rootUri) {
+ super(activity);
+ mRootUri = rootUri;
+ }
+
+ @Override
+ protected RootInfo run(Void... params) {
+ String rootId = DocumentsContract.getRootId(mRootUri);
+ return mOwner.mRoots.getRootOneshot(mRootUri.getAuthority(), rootId);
+ }
+
+ @Override
+ protected void finish(RootInfo root) {
+ mOwner.mState.restored = true;
+
+ if (root != null) {
+ mOwner.onRootPicked(root);
+ } else {
+ Log.w(TAG, "Failed to find root: " + mRootUri);
+ mOwner.finish();
+ }
+ }
+}