Initial checkin of the Java OfflineContentProvider

components/offline_items_collection/core/android/offline_content_aggregator_bridge.h

Index: components/offline_items_collection/core/android/offline_content_aggregator_bridge.h
diff --git a/components/offline_items_collection/core/android/offline_content_aggregator_bridge.h b/components/offline_items_collection/core/android/offline_content_aggregator_bridge.h
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+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_OFFLINE_ITEMS_COLLECTION_CORE_ANDROID_OFFLINE_CONTENT_AGGREGATOR_BRIDGE_H_
+#define COMPONENTS_OFFLINE_ITEMS_COLLECTION_CORE_ANDROID_OFFLINE_CONTENT_AGGREGATOR_BRIDGE_H_
+
+#include "base/android/jni_android.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/supports_user_data.h"
+#include "components/offline_items_collection/core/offline_content_aggregator.h"
+#include "components/offline_items_collection/core/offline_content_provider.h"
+
+namespace offline_items_collection {
+
+struct ContentId;
+struct OfflineItem;
+
+namespace android {
+
+// A helper class responsible for bridging an OfflineContentAggregator from C++
+// to Java.  This class attaches as a piece of SupportsUserData::Data to the
+// OfflineContentAggregator and can only be created through the
+// GetForOfflineContentAggregator() method.
+// This class creates and contains a strong reference to it's Java counterpart,
+// so the Java bridge will live as long as this class lives.  For more
+// information on the Java counterpart see OfflineContentAggregatorBridge.java.
+class OfflineContentAggregatorBridge : public OfflineContentProvider::Observer,
+                                       public base::SupportsUserData::Data {
+ public:
+  // Helper method to initialize the JNI hooks between Java and C++.
+  static bool Register(JNIEnv* env);
+
+  // Returns an OfflineContentAggregatorBridge for |aggregator|.  There will be
+  // only one bridge per OfflineContentAggregator.
+  static OfflineContentAggregatorBridge* GetForOfflineContentAggregator(
+      OfflineContentAggregator* aggregator);
+
+  ~OfflineContentAggregatorBridge() override;
+
+  // Methods called from Java via JNI.
+  jboolean AreItemsAvailable(JNIEnv* env,
+                             const base::android::JavaParamRef<jobject>& jobj);
+  void OpenItem(JNIEnv* env,
+                const base::android::JavaParamRef<jobject>& jobj,
+                const base::android::JavaParamRef<jstring>& j_namespace,
+                const base::android::JavaParamRef<jstring>& j_id);
+  void RemoveItem(JNIEnv* env,
+                  const base::android::JavaParamRef<jobject>& jobj,
+                  const base::android::JavaParamRef<jstring>& j_namespace,
+                  const base::android::JavaParamRef<jstring>& j_id);
+  void CancelDownload(JNIEnv* env,
+                      const base::android::JavaParamRef<jobject>& jobj,
+                      const base::android::JavaParamRef<jstring>& j_namespace,
+                      const base::android::JavaParamRef<jstring>& j_id);
+  void PauseDownload(JNIEnv* env,
+                     const base::android::JavaParamRef<jobject>& jobj,
+                     const base::android::JavaParamRef<jstring>& j_namespace,
+                     const base::android::JavaParamRef<jstring>& j_id);
+  void ResumeDownload(JNIEnv* env,
+                      const base::android::JavaParamRef<jobject>& jobj,
+                      const base::android::JavaParamRef<jstring>& j_namespace,
+                      const base::android::JavaParamRef<jstring>& j_id);
+  base::android::ScopedJavaLocalRef<jobject> GetItemById(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& jobj,
+      const base::android::JavaParamRef<jstring>& j_namespace,
+      const base::android::JavaParamRef<jstring>& j_id);
+  base::android::ScopedJavaLocalRef<jobject> GetAllItems(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& jobj);
+
+ private:
+  OfflineContentAggregatorBridge(OfflineContentAggregator* aggregator);
+
+  // OfflineContentProvider::Observer implementation.
+  void OnItemsAvailable(OfflineContentProvider* provider) override;
+  void OnItemsAdded(
+      const OfflineContentProvider::OfflineItemList& items) override;
+  void OnItemRemoved(const ContentId& id) override;
+  void OnItemUpdated(const OfflineItem& item) override;
+
+  // A reference to the Java counterpart of this class.  See
+  // OfflineContentAggregatorBridge.java.
+  base::android::ScopedJavaGlobalRef<jobject> java_ref_;
+
+  OfflineContentAggregator* const aggregator_;
+
+  DISALLOW_COPY_AND_ASSIGN(OfflineContentAggregatorBridge);
+};
+
+}  // namespace android
+}  // namespace offline_items_collection
+
+#endif  // COMPONENTS_OFFLINE_ITEMS_COLLECTION_CORE_ANDROID_OFFLINE_CONTENT_AGGREGATOR_BRIDGE_H_