1 files changed, 49 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/FilteringManifestParser.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/FilteringManifestParser.java
new file mode 100644
index 0000000000..a34d749039
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/FilteringManifestParser.java
@@ -0,0 +1,49 @@
+/*
+ * 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 org.mozilla.thirdparty.com.google.android.exoplayer2.offline;
+
+import android.net.Uri;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.ParsingLoadable.Parser;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+/**
+ * A manifest parser that includes only the streams identified by the given stream keys.
+ *
+ * @param <T> The {@link FilterableManifest} type.
+ */
+public final class FilteringManifestParser<T extends FilterableManifest<T>> implements Parser<T> {
+
+  private final Parser<? extends T> parser;
+  @Nullable private final List<StreamKey> streamKeys;
+
+  /**
+   * @param parser A parser for the manifest that will be filtered.
+   * @param streamKeys The stream keys. If null or empty then filtering will not occur.
+   */
+  public FilteringManifestParser(Parser<? extends T> parser, @Nullable List<StreamKey> streamKeys) {
+    this.parser = parser;
+    this.streamKeys = streamKeys;
+  }
+
+  @Override
+  public T parse(Uri uri, InputStream inputStream) throws IOException {
+    T manifest = parser.parse(uri, inputStream);
+    return streamKeys == null || streamKeys.isEmpty() ? manifest : manifest.copy(streamKeys);
+  }
+}