Adding methods that will be used by the quota management UI.

TEST=none
BUG=none


Review URL: http://codereview.chromium.org/507014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35651 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 78 insertions, 0 deletions

diff --git a/webkit/database/database_connections.cc b/webkit/database/database_connections.cc
new file mode 100644
index 0000000..a6e6d3d
--- /dev/null
+++ b/webkit/database/database_connections.cc
@@ -0,0 +1,78 @@
+// Copyright (c) 2009 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 "webkit/database/database_connections.h"
+
+#include "base/logging.h"
+
+namespace webkit_database {
+
+DatabaseConnections::DatabaseConnections() {
+}
+
+DatabaseConnections::~DatabaseConnections() {
+  DCHECK(connections_.empty());
+}
+
+bool DatabaseConnections::IsDatabaseOpened(const string16& origin_identifier,
+                                           const string16& database_name) {
+  OriginConnections::const_iterator origin_it =
+      connections_.find(origin_identifier);
+  if (origin_it == connections_.end())
+    return false;
+  const DBConnections& origin_connections = origin_it->second;
+  return (origin_connections.find(database_name) != origin_connections.end());
+}
+
+bool DatabaseConnections::IsOriginUsed(const string16& origin_identifier) {
+  return (connections_.find(origin_identifier) != connections_.end());
+}
+
+void DatabaseConnections::AddConnection(const string16& origin_identifier,
+                                        const string16& database_name) {
+  connections_[origin_identifier][database_name]++;
+}
+
+void DatabaseConnections::RemoveConnection(const string16& origin_identifier,
+                                           const string16& database_name) {
+  RemoveConnectionsHelper(origin_identifier, database_name, 1);
+}
+
+void DatabaseConnections::RemoveAllConnections() {
+  connections_.clear();
+}
+
+void DatabaseConnections::RemoveConnections(
+    const DatabaseConnections& connections) {
+  for (OriginConnections::const_iterator origin_it =
+           connections.connections_.begin();
+       origin_it != connections.connections_.end();
+       origin_it++) {
+    const DBConnections& db_connections = origin_it->second;
+    for (DBConnections::const_iterator db_it = db_connections.begin();
+         db_it != db_connections.end(); db_it++) {
+      RemoveConnectionsHelper(origin_it->first, db_it->first, db_it->second);
+    }
+  }
+}
+
+void DatabaseConnections::RemoveConnectionsHelper(
+    const string16& origin_identifier,
+    const string16& database_name,
+    int num_connections) {
+  OriginConnections::iterator origin_iterator =
+      connections_.find(origin_identifier);
+  DCHECK(origin_iterator != connections_.end());
+  DBConnections& db_connections = origin_iterator->second;
+  int& count = db_connections[database_name];
+  DCHECK(count >= num_connections);
+  count -= num_connections;
+  if (!count) {
+    db_connections.erase(database_name);
+    if (db_connections.empty())
+      connections_.erase(origin_iterator);
+  }
+}
+
+}  // namespace webkit_database