chrome/browser/prerender/prerender_history.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/prerender/prerender_history.h"
   6
   7 #include "base/logging.h"
   8 #include "base/strings/string_number_conversions.h"
   9 #include "base/values.h"
  10
  11 namespace prerender {
  12
  13 PrerenderHistory::PrerenderHistory(size_t max_items)
  14     : max_items_(max_items) {
  15   DCHECK(max_items > 0);
  16 }
  17
  18 PrerenderHistory::~PrerenderHistory() {
  19 }
  20
  21 void PrerenderHistory::AddEntry(const Entry& entry) {
  22   DCHECK(CalledOnValidThread());
  23   while (entries_.size() >= max_items_)
  24     entries_.pop_front();
  25   entries_.push_back(entry);
  26 }
  27
  28 void PrerenderHistory::Clear() {
  29   entries_.clear();
  30 }
  31
  32 base::Value* PrerenderHistory::GetEntriesAsValue() const {
  33   base::ListValue* return_list = new base::ListValue();
  34   // Javascript needs times in terms of milliseconds since Jan 1, 1970.
  35   base::Time epoch_start = base::Time::UnixEpoch();
  36   for (std::list<Entry>::const_reverse_iterator it = entries_.rbegin();
  37        it != entries_.rend();
  38        ++it) {
  39     const Entry& entry = *it;
  40     base::DictionaryValue* entry_dict = new base::DictionaryValue();
  41     entry_dict->SetString("url", entry.url.spec());
  42     entry_dict->SetString("final_status",
  43                           NameFromFinalStatus(entry.final_status));
  44     entry_dict->SetString("origin", NameFromOrigin(entry.origin));
  45     // Use a string to prevent overflow, as Values don't support 64-bit
  46     // integers.
  47     entry_dict->SetString(
  48         "end_time",
  49         base::Int64ToString((entry.end_time - epoch_start).InMilliseconds()));
  50     return_list->Append(entry_dict);
  51   }
  52   return return_list;
  53 }
  54
  55 }  // namespace prerender