pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/thirdparty/com/keepsafe/switchboard/Preferences.java

@@ -0,0 +1,105 @@
+/*
+   Copyright 2012 KeepSafe Software Inc.
+
+   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.keepsafe.switchboard;
+
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.support.annotation.Nullable;
+
+/**
+ * Application preferences for SwitchBoard.
+ * @author Philipp Berner
+ *
+ */
+public class Preferences {
+
+    private static final String switchBoardSettings = "com.keepsafe.switchboard.settings";
+
+    private static final String CONFIG_JSON = "config-json";
+    private static final String OVERRIDE_PREFIX = "experiment.override.";
+
+
+    /**
+     * Gets the user config as a JSON string.
+     * @param c Context
+     * @return Config JSON
+     */
+    @Nullable public static String getDynamicConfigJson(Context c) {
+        final SharedPreferences prefs = c.getApplicationContext().getSharedPreferences(switchBoardSettings, Context.MODE_PRIVATE);
+        return prefs.getString(CONFIG_JSON, null);
+    }
+
+    /**
+     * Saves the user config as a JSON sting.
+     * @param c Context
+     * @param configJson Config JSON
+     */
+    public static void setDynamicConfigJson(Context c, String configJson) {
+        final SharedPreferences.Editor editor = c.getApplicationContext().
+                getSharedPreferences(switchBoardSettings, Context.MODE_PRIVATE).edit();
+        editor.putString(CONFIG_JSON, configJson);
+        editor.apply();
+    }
+
+    /**
+     * Gets the override value for an experiment.
+     *
+     * @param c Context
+     * @param experimentName Experiment name
+     * @return Whether or not the experiment should be enabled, or null if there is no override.
+     */
+    @Nullable public static Boolean getOverrideValue(Context c, String experimentName) {
+        final SharedPreferences prefs = c.getApplicationContext().
+                getSharedPreferences(switchBoardSettings, Context.MODE_PRIVATE);
+
+        final String key = OVERRIDE_PREFIX + experimentName;
+        if (prefs.contains(key)) {
+            // This will never fall back to the default value.
+            return prefs.getBoolean(key, false);
+        }
+
+        // Default to returning null if no override was found.
+        return null;
+    }
+
+    /**
+     * Saves an override value for an experiment.
+     *
+     * @param c Context
+     * @param experimentName Experiment name
+     * @param isEnabled Whether or not to enable the experiment
+     */
+    public static void setOverrideValue(Context c, String experimentName, boolean isEnabled) {
+        final SharedPreferences.Editor editor = c.getApplicationContext().
+                getSharedPreferences(switchBoardSettings, Context.MODE_PRIVATE).edit();
+        editor.putBoolean(OVERRIDE_PREFIX + experimentName, isEnabled);
+        editor.apply();
+    }
+
+    /**
+     * Clears the override value for an experiment.
+     *
+     * @param c Context
+     * @param experimentName Experiment name
+     */
+    public static void clearOverrideValue(Context c, String experimentName) {
+        final SharedPreferences.Editor editor = c.getApplicationContext().
+                getSharedPreferences(switchBoardSettings, Context.MODE_PRIVATE).edit();
+        editor.remove(OVERRIDE_PREFIX + experimentName);
+        editor.apply();
+    }
+}