[BlobAsync] Disk support for blob storage

storage/browser/blob/shareable_blob_data_item.cc

 // Copyright 2015 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.
 
 #include "storage/browser/blob/shareable_blob_data_item.h"
 
 #include "storage/browser/blob/blob_data_item.h"
 
 namespace storage {
+namespace {
 
-ShareableBlobDataItem::ShareableBlobDataItem(
-    const std::string& blob_uuid,
-    const scoped_refptr<BlobDataItem>& item)
-    : item_(item) {
+uint64_t GetAndIncrementItemId() {
+  static uint64_t sNextItemId = 0;
+  return sNextItemId++;
+}
+
+}  // namespace
+
+ShareableBlobDataItem::ShareableBlobDataItem(scoped_refptr<BlobDataItem> item,
+                                             ShareableBlobDataItem::State state)
+    : item_id_(GetAndIncrementItemId()), state_(state), item_(std::move(item)) {
   DCHECK_NE(item_->type(), DataElement::TYPE_BLOB);
-  referencing_blobs_.insert(blob_uuid);
 }
 
 ShareableBlobDataItem::~ShareableBlobDataItem() {
 }
 
-const scoped_refptr<BlobDataItem>& ShareableBlobDataItem::item() {
+const scoped_refptr<BlobDataItem>& ShareableBlobDataItem::item() const {
   return item_;
 }
 
+void PrintTo(const ShareableBlobDataItem& x, ::std::ostream* os) {
+  *os << "<ShareableBlobDataItem>{ item_id: " << x.item_id_
+      << ", state: " << x.state_ << ", item: ";
+  PrintTo(*x.item_, os);
+  *os << ", referencing_blobs: [";
+  for (const std::string& uuid : x.referencing_blobs_) {
+    *os << uuid << ", ";
+  }
+  *os << "]}";
+}
+
+bool operator==(const ShareableBlobDataItem& a,
+                const ShareableBlobDataItem& b) {
+  return a.item_id() == b.item_id() && *a.item() == *b.item() &&
+         a.referencing_blobs() == b.referencing_blobs();
+}
+
+bool operator!=(const ShareableBlobDataItem& a,
+                const ShareableBlobDataItem& b) {
+  return !(a == b);
+}
+
 }  // namespace storage