chrome/browser/parsers/metadata_parser_manager.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/parsers/metadata_parser_manager.h"
   6
   7 #include "base/logging.h"
   8 #include "base/file_util.h"
   9 #include "base/memory/singleton.h"
  10 #include "base/stl_util.h"
  11 #include "build/build_config.h"
  12 #include "chrome/browser/parsers/metadata_parser_factory.h"
  13 #include "chrome/browser/parsers/metadata_parser_jpeg_factory.h"
  14
  15 static const int kAmountToRead = 256;
  16
  17 // Gets the singleton
  18 MetadataParserManager* MetadataParserManager::GetInstance() {
  19   // Uses the LeakySingletonTrait because cleanup is optional.
  20   return Singleton<MetadataParserManager,
  21                    LeakySingletonTraits<MetadataParserManager> >::get();
  22 }
  23
  24 bool MetadataParserManager::RegisterParserFactory(
  25     MetadataParserFactory* parser) {
  26   factories_.push_back(parser);
  27   return true;
  28 }
  29
  30 MetadataParserManager::MetadataParserManager() {
  31   MetadataParserJpegFactory *factory = new MetadataParserJpegFactory();
  32   RegisterParserFactory(factory);
  33 }
  34
  35 MetadataParserManager::~MetadataParserManager() {}
  36
  37 MetadataParser* MetadataParserManager::GetParserForFile(
  38     const base::FilePath& path) {
  39   char buffer[kAmountToRead];
  40   int amount_read = 0;
  41   DLOG(ERROR) << path.value();
  42   amount_read = base::ReadFile(path, buffer, sizeof(buffer));
  43   if (amount_read <= 0) {
  44     DLOG(ERROR) << "Unable to read file";
  45     return NULL;
  46   }
  47   for (size_t x = 0; x < factories_.size(); ++x) {
  48     if (factories_[x]->CanParse(path, buffer, amount_read)) {
  49       return factories_[x]->CreateParser(path);
  50     }
  51   }
  52   return NULL;
  53 }