Return number of values deleted by IDBObjectStore.delete(range)

content/browser/indexed_db/leveldb/leveldb_transaction.cc

 // Copyright (c) 2013 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 "content/browser/indexed_db/leveldb/leveldb_transaction.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
@@ skipping 18 matching lines @@
 LevelDBTransaction::Record::~Record() {}
 
 void LevelDBTransaction::Clear() {
   for (const auto& it : data_)
     delete it.second;
   data_.clear();
 }
 
 LevelDBTransaction::~LevelDBTransaction() { Clear(); }
 
-void LevelDBTransaction::Set(const StringPiece& key,
+bool LevelDBTransaction::Set(const StringPiece& key,
                              std::string* value,
                              bool deleted) {
   DCHECK(!finished_);
   DataType::iterator it = data_.find(key);
 
   if (it == data_.end()) {
     Record* record = new Record();
     record->key.assign(key.begin(), key.end() - key.begin());
     record->value.swap(*value);
     record->deleted = deleted;
     data_[record->key] = record;
     NotifyIterators();
-    return;
+    return false;
   }
-
+  bool replaced_deleted_value = it->second->deleted;
   it->second->value.swap(*value);
   it->second->deleted = deleted;
+  return replaced_deleted_value;
 }
 
 void LevelDBTransaction::Put(const StringPiece& key, std::string* value) {
   Set(key, value, false);
 }
 
-void LevelDBTransaction::Remove(const StringPiece& key) {
+bool LevelDBTransaction::Remove(const StringPiece& key) {
   std::string empty;
-  Set(key, &empty, true);
+  return !Set(key, &empty, true);
 }
 
 leveldb::Status LevelDBTransaction::Get(const StringPiece& key,
                                         std::string* value,
                                         bool* found) {
   *found = false;
   DCHECK(!finished_);
   std::string string_key(key.begin(), key.end() - key.begin());
   DataType::const_iterator it = data_.find(string_key);
 
@@ skipping 418 matching lines @@
 
   leveldb::Status s = db_->Write(*write_batch_);
   if (s.ok()) {
     finished_ = true;
     write_batch_->Clear();
   }
   return s;
 }
 
 }  // namespace content