1 files changed, 93 insertions, 0 deletions
diff --git a/media/java/android/media/MediaRouter2Utils.java b/media/java/android/media/MediaRouter2Utils.java
new file mode 100644
index 000000000000..c15972dcff2e
--- /dev/null
+++ b/media/java/android/media/MediaRouter2Utils.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2020 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 android.media;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.text.TextUtils;
+import android.util.Log;
+
+/**
+ * @hide
+ */
+public class MediaRouter2Utils {
+
+    static final String TAG = "MR2Utils";
+    static final String SEPARATOR = ":";
+
+    @NonNull
+    public static String toUniqueId(@NonNull String providerId, @NonNull String id) {
+        if (TextUtils.isEmpty(providerId)) {
+            Log.w(TAG, "toUniqueId: providerId shouldn't be empty");
+            return null;
+        }
+        if (TextUtils.isEmpty(id)) {
+            Log.w(TAG, "toUniqueId: id shouldn't be null");
+            return null;
+        }
+
+        return providerId + SEPARATOR + id;
+    }
+
+    /**
+     * Gets provider ID from unique ID.
+     * If the corresponding provider ID could not be generated, it will return null.
+     */
+    @Nullable
+    public static String getProviderId(@NonNull String uniqueId) {
+        if (TextUtils.isEmpty(uniqueId)) {
+            Log.w(TAG, "getProviderId: uniqueId shouldn't be empty");
+            return null;
+        }
+
+        int firstIndexOfSeparator = uniqueId.indexOf(SEPARATOR);
+        if (firstIndexOfSeparator == -1) {
+            return null;
+        }
+
+        String providerId = uniqueId.substring(0, firstIndexOfSeparator);
+        if (TextUtils.isEmpty(providerId)) {
+            return null;
+        }
+
+        return providerId;
+    }
+
+    /**
+     * Gets the original ID (i.e. non-unique route/session ID) from unique ID.
+     * If the corresponding ID could not be generated, it will return null.
+     */
+    @Nullable
+    public static String getOriginalId(@NonNull String uniqueId) {
+        if (TextUtils.isEmpty(uniqueId)) {
+            Log.w(TAG, "getOriginalId: uniqueId shouldn't be empty");
+            return null;
+        }
+
+        int firstIndexOfSeparator = uniqueId.indexOf(SEPARATOR);
+        if (firstIndexOfSeparator == -1 || firstIndexOfSeparator + 1 >= uniqueId.length()) {
+            return null;
+        }
+
+        String providerId = uniqueId.substring(firstIndexOfSeparator + 1);
+        if (TextUtils.isEmpty(providerId)) {
+            return null;
+        }
+
+        return providerId;
+    }
+}