1 files changed, 145 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/cache/ContentMetadataMutations.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/cache/ContentMetadataMutations.java
new file mode 100644
index 0000000000..c7a8d9f711
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/cache/ContentMetadataMutations.java
@@ -0,0 +1,145 @@
+/*
+ * 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.cache;
+
+import android.net.Uri;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+/**
+ * Defines multiple mutations on metadata value which are applied atomically. This class isn't
+ * thread safe.
+ */
+public class ContentMetadataMutations {
+
+  /**
+   * Adds a mutation to set the {@link ContentMetadata#KEY_CONTENT_LENGTH} value, or to remove any
+   * existing value if {@link C#LENGTH_UNSET} is passed.
+   *
+   * @param mutations The mutations to modify.
+   * @param length The length value, or {@link C#LENGTH_UNSET} to remove any existing entry.
+   * @return The mutations instance, for convenience.
+   */
+  public static ContentMetadataMutations setContentLength(
+      ContentMetadataMutations mutations, long length) {
+    return mutations.set(ContentMetadata.KEY_CONTENT_LENGTH, length);
+  }
+
+  /**
+   * Adds a mutation to set the {@link ContentMetadata#KEY_REDIRECTED_URI} value, or to remove any
+   * existing entry if {@code null} is passed.
+   *
+   * @param mutations The mutations to modify.
+   * @param uri The {@link Uri} value, or {@code null} to remove any existing entry.
+   * @return The mutations instance, for convenience.
+   */
+  public static ContentMetadataMutations setRedirectedUri(
+      ContentMetadataMutations mutations, @Nullable Uri uri) {
+    if (uri == null) {
+      return mutations.remove(ContentMetadata.KEY_REDIRECTED_URI);
+    } else {
+      return mutations.set(ContentMetadata.KEY_REDIRECTED_URI, uri.toString());
+    }
+  }
+
+  private final Map<String, Object> editedValues;
+  private final List<String> removedValues;
+
+  /** Constructs a DefaultMetadataMutations. */
+  public ContentMetadataMutations() {
+    editedValues = new HashMap<>();
+    removedValues = new ArrayList<>();
+  }
+
+  /**
+   * Adds a mutation to set a metadata value. Passing {@code null} as {@code name} or {@code value}
+   * isn't allowed.
+   *
+   * @param name The name of the metadata value.
+   * @param value The value to be set.
+   * @return This instance, for convenience.
+   */
+  public ContentMetadataMutations set(String name, String value) {
+    return checkAndSet(name, value);
+  }
+
+  /**
+   * Adds a mutation to set a metadata value. Passing {@code null} as {@code name} isn't allowed.
+   *
+   * @param name The name of the metadata value.
+   * @param value The value to be set.
+   * @return This instance, for convenience.
+   */
+  public ContentMetadataMutations set(String name, long value) {
+    return checkAndSet(name, value);
+  }
+
+  /**
+   * Adds a mutation to set a metadata value. Passing {@code null} as {@code name} or {@code value}
+   * isn't allowed.
+   *
+   * @param name The name of the metadata value.
+   * @param value The value to be set.
+   * @return This instance, for convenience.
+   */
+  public ContentMetadataMutations set(String name, byte[] value) {
+    return checkAndSet(name, Arrays.copyOf(value, value.length));
+  }
+
+  /**
+   * Adds a mutation to remove a metadata value.
+   *
+   * @param name The name of the metadata value.
+   * @return This instance, for convenience.
+   */
+  public ContentMetadataMutations remove(String name) {
+    removedValues.add(name);
+    editedValues.remove(name);
+    return this;
+  }
+
+  /** Returns a list of names of metadata values to be removed. */
+  public List<String> getRemovedValues() {
+    return Collections.unmodifiableList(new ArrayList<>(removedValues));
+  }
+
+  /** Returns a map of metadata name, value pairs to be set. Values are copied.  */
+  public Map<String, Object> getEditedValues() {
+    HashMap<String, Object> hashMap = new HashMap<>(editedValues);
+    for (Entry<String, Object> entry : hashMap.entrySet()) {
+      Object value = entry.getValue();
+      if (value instanceof byte[]) {
+        byte[] bytes = (byte[]) value;
+        entry.setValue(Arrays.copyOf(bytes, bytes.length));
+      }
+    }
+    return Collections.unmodifiableMap(hashMap);
+  }
+
+  private ContentMetadataMutations checkAndSet(String name, Object value) {
+    editedValues.put(Assertions.checkNotNull(name), Assertions.checkNotNull(value));
+    removedValues.remove(name);
+    return this;
+  }
+}