Add attachments support to DomDistillerStore

components/dom_distiller/core/article_attachments_data.h

+// Copyright 2014 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_DOM_DISTILLER_CORE_ARTICLE_ATTACHMENTS_DATA_H_
+#define COMPONENTS_DOM_DISTILLER_CORE_ARTICLE_ATTACHMENTS_DATA_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "components/dom_distiller/core/proto/distilled_article.pb.h"
+#include "sync/api/attachments/attachment.h"
+#include "sync/protocol/article_specifics.pb.h"
+
+namespace dom_distiller {
+
+// When stored, article attachments are split into two pieces, the actual data
+// is stored by a set of ids in some attachment storage. The mapping of what
+// each id corresponds to is stored in the ArticleEntry's
+// sync_pb::ArticleAttachments.  This class handles splitting into those two
+// pieces (::CreateSyncAttachments) and reconstructing the data from the two
+// pieces (::GetFromAttachmentMap and ::GetAttachmentIds). Outside of this
+// class, the structure of sync_pb::ArticleAttachments (the id mapping) should
+// be rather opaque.
+class ArticleAttachmentsData {
+ public:
+  static scoped_ptr<ArticleAttachmentsData> GetFromAttachmentMap(
+      const sync_pb::ArticleAttachments& attachments_key,
+      const syncer::AttachmentMap& attachment_map);
+
+  // Creates sync attachments and the sync_pb::ArticleAttachments id map.
+  void CreateSyncAttachments(
+      syncer::AttachmentList* attachment_list,
+      sync_pb::ArticleAttachments* attachments_key) const;
+
+  const DistilledArticleProto& distilled_article() const {
+    return distilled_article_;
+  }
+  void set_distilled_article(const DistilledArticleProto& article) {
+    distilled_article_ = article;
+  }
+
+  std::string ToString() const;
+ private:
+  DistilledArticleProto distilled_article_;
+};
+
+syncer::AttachmentIdList GetAttachmentIds(
+    const sync_pb::ArticleAttachments& attachments);
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_CORE_ARTICLE_ATTACHMENTS_DATA_H_