1 files changed, 102 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/BaseDataSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/BaseDataSource.java
new file mode 100644
index 0000000000..3838094927
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/BaseDataSource.java
@@ -0,0 +1,102 @@
+/*
+ * 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.upstream;
+
+import static org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util.castNonNull;
+
+import androidx.annotation.Nullable;
+import java.util.ArrayList;
+
+/**
+ * Base {@link DataSource} implementation to keep a list of {@link TransferListener}s.
+ *
+ * <p>Subclasses must call {@link #transferInitializing(DataSpec)}, {@link
+ * #transferStarted(DataSpec)}, {@link #bytesTransferred(int)}, and {@link #transferEnded()} to
+ * inform listeners of data transfers.
+ */
+public abstract class BaseDataSource implements DataSource {
+
+  private final boolean isNetwork;
+  private final ArrayList<TransferListener> listeners;
+
+  private int listenerCount;
+  @Nullable private DataSpec dataSpec;
+
+  /**
+   * Creates base data source.
+   *
+   * @param isNetwork Whether the data source loads data through a network.
+   */
+  protected BaseDataSource(boolean isNetwork) {
+    this.isNetwork = isNetwork;
+    this.listeners = new ArrayList<>(/* initialCapacity= */ 1);
+  }
+
+  @Override
+  public final void addTransferListener(TransferListener transferListener) {
+    if (!listeners.contains(transferListener)) {
+      listeners.add(transferListener);
+      listenerCount++;
+    }
+  }
+
+  /**
+   * Notifies listeners that data transfer for the specified {@link DataSpec} is being initialized.
+   *
+   * @param dataSpec {@link DataSpec} describing the data for initializing transfer.
+   */
+  protected final void transferInitializing(DataSpec dataSpec) {
+    for (int i = 0; i < listenerCount; i++) {
+      listeners.get(i).onTransferInitializing(/* source= */ this, dataSpec, isNetwork);
+    }
+  }
+
+  /**
+   * Notifies listeners that data transfer for the specified {@link DataSpec} started.
+   *
+   * @param dataSpec {@link DataSpec} describing the data being transferred.
+   */
+  protected final void transferStarted(DataSpec dataSpec) {
+    this.dataSpec = dataSpec;
+    for (int i = 0; i < listenerCount; i++) {
+      listeners.get(i).onTransferStart(/* source= */ this, dataSpec, isNetwork);
+    }
+  }
+
+  /**
+   * Notifies listeners that bytes were transferred.
+   *
+   * @param bytesTransferred The number of bytes transferred since the previous call to this method
+   *     (or if the first call, since the transfer was started).
+   */
+  protected final void bytesTransferred(int bytesTransferred) {
+    DataSpec dataSpec = castNonNull(this.dataSpec);
+    for (int i = 0; i < listenerCount; i++) {
+      listeners
+          .get(i)
+          .onBytesTransferred(/* source= */ this, dataSpec, isNetwork, bytesTransferred);
+    }
+  }
+
+  /** Notifies listeners that a transfer ended. */
+  protected final void transferEnded() {
+    DataSpec dataSpec = castNonNull(this.dataSpec);
+    for (int i = 0; i < listenerCount; i++) {
+      listeners.get(i).onTransferEnd(/* source= */ this, dataSpec, isNetwork);
+    }
+    this.dataSpec = null;
+  }
+}