From f4d280ce40ba0aa50d6b2c70d8031ddf7678d179 Mon Sep 17 00:00:00 2001
From: Zhomart Mukhamejanov <zhomart@google.com>
Date: Tue, 17 Apr 2018 13:20:22 -0700
Subject: sample_updater: add non-streaming demo

SampleUpdater app was tested manually on a device.
There are unit tests for utility classes.

SampleUpdater app demonstrates how to use Android Update Engine to
apply A/B (seamless) update.
This CL contains demo of non-stream update using async update_engine,
which is accessed directly from an activity.
This app also shows logs from update_engine on the UI.
Instructions can be found in `README.md`.

- Create a UI with list of configs, current version, control buttons and a progress bar
- Add PayloadSpec and PayloadSpecs for working with update zip file
- Add UpdateConfig for working with json config files
- Add applying non-streaming update

Test: tested manually and unit tests for utilities
Change-Id: I05d4a46ad9cf8b334c9c60c7dd4da486dac0400a
Signed-off-by: Zhomart Mukhamejanov <zhomart@google.com>
---
 .../systemupdatersample/util/UpdateConfigs.java    | 82 ++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 sample_updater/src/com/example/android/systemupdatersample/util/UpdateConfigs.java

(limited to 'sample_updater/src/com/example/android/systemupdatersample/util/UpdateConfigs.java')

diff --git a/sample_updater/src/com/example/android/systemupdatersample/util/UpdateConfigs.java b/sample_updater/src/com/example/android/systemupdatersample/util/UpdateConfigs.java
new file mode 100644
index 000000000..089f8b2f2
--- /dev/null
+++ b/sample_updater/src/com/example/android/systemupdatersample/util/UpdateConfigs.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2018 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.example.android.systemupdatersample.util;
+
+import android.content.Context;
+
+import com.example.android.systemupdatersample.UpdateConfig;
+
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Utility class for working with json update configurations.
+ */
+public final class UpdateConfigs {
+
+    private static final String UPDATE_CONFIGS_ROOT = "configs/";
+
+    /**
+     * @param configs update configs
+     * @return list of names
+     */
+    public static String[] configsToNames(List<UpdateConfig> configs) {
+        return configs.stream().map(UpdateConfig::getName).toArray(String[]::new);
+    }
+
+    /**
+     * @param context app context
+     * @return configs root directory
+     */
+    public static String getConfigsRoot(Context context) {
+        return Paths.get(context.getFilesDir().toString(),
+                UPDATE_CONFIGS_ROOT).toString();
+    }
+
+    /**
+     * It parses only {@code .json} files.
+     *
+     * @param context application context
+     * @return list of configs from directory {@link UpdateConfigs#getConfigsRoot}
+     */
+    public static List<UpdateConfig> getUpdateConfigs(Context context) {
+        File root = new File(getConfigsRoot(context));
+        ArrayList<UpdateConfig> configs = new ArrayList<>();
+        if (!root.exists()) {
+            return configs;
+        }
+        for (final File f : root.listFiles()) {
+            if (!f.isDirectory() && f.getName().endsWith(".json")) {
+                try {
+                    String json = new String(Files.readAllBytes(f.toPath()),
+                            StandardCharsets.UTF_8);
+                    configs.add(UpdateConfig.fromJson(json));
+                } catch (Exception e) {
+                    throw new RuntimeException(
+                            "Can't read/parse config file " + f.getName(), e);
+                }
+            }
+        }
+        return configs;
+    }
+
+    private UpdateConfigs() {}
+}
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