Removes shared code in PushAdapter, replaces AdapterLoader.load by loadAdapter

src/Adapters/Push/PushAdapterUtils.js

@@ -0,0 +1,30 @@
+/**g
+   * Classify the device token of installations based on its device type.
+   * @param {Object} installations An array of installations
+   * @param {Array} validPushTypes An array of valid push types(string)
+   * @returns {Object} A map whose key is device type and value is an array of device
+   */
+export function classifyInstallations(installations, validPushTypes) {
+  // Init deviceTokenMap, create a empty array for each valid pushType
+  let deviceMap = {};
+  for (let validPushType of validPushTypes) {
+    deviceMap[validPushType] = [];
+  }
+  for (let installation of installations) {
+    // No deviceToken, ignore
+    if (!installation.deviceToken) {
+      continue;
+    }
+    let pushType = installation.deviceType;
+    if (deviceMap[pushType]) {
+      deviceMap[pushType].push({
+        deviceToken: installation.deviceToken,
+        appIdentifier: installation.appIdentifier
+      });
+    } else {
+      console.log('Unknown push type from installation %j', installation);
+    }
+  }
+  return deviceMap;
+}
+