Sessions API - previously Session Restore API. Supports restoring currently open foreign windows an…

chrome/browser/extensions/api/sessions/session_id.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 "chrome/browser/extensions/api/sessions/session_id.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringprintf.h"
+
+namespace extensions {
+
+const char kIdSeparator = '.';
+
+// static
+scoped_ptr<SessionId> SessionId::Parse(const std::string& session_id) {
+  std::string session_tag;
+
+  // Populate session_tag if the |session_id| represents a foreign SessionId.
+  std::size_t separator = session_id.find(kIdSeparator);
+  if (separator != std::string::npos) {
+    session_tag = session_id.substr(0, separator);
+  }
+
+  // session_tag will be the empty string for local sessions that have only
+  // a unique integer as the identifier.
+  int id;
+  if (!base::StringToInt(
+      session_tag.empty() ? session_id : session_id.substr(separator + 1),
+      &id)) {
+    return scoped_ptr<SessionId>();
+  }
+  return make_scoped_ptr(new SessionId(session_tag, id));
+}
+
+SessionId::SessionId(const std::string& session_tag, int id)
+    : session_tag_(session_tag), id_(id) {
+}
+
+bool SessionId::IsForeign() const {
+  return !session_tag_.empty();
+}
+
+std::string SessionId::ToString() const {
+  return IsForeign() ?
+      (session_tag_ + kIdSeparator + base::StringPrintf("%d", id_))
+      : base::StringPrintf("%d", id_);
+}
+
+}  // namespace extensions