Adding a new parsing system to the metadata url request.

BUG=none
TEST=none
Original review: http://codereview.chromium.org/155803
Patch by: dhg@google.com

Review URL: http://codereview.chromium.org/160059

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@21469 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 56 insertions, 0 deletions

diff --git a/chrome/browser/parsers/metadata_parser_manager.cc b/chrome/browser/parsers/metadata_parser_manager.cc
new file mode 100644
index 0000000..3efce7d
--- /dev/null
+++ b/chrome/browser/parsers/metadata_parser_manager.cc
@@ -0,0 +1,56 @@
+// 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 "chrome/browser/parsers/metadata_parser_manager.h"
+
+#include "base/logging.h"
+#include "base/file_util.h"
+#include "base/singleton.h"
+#include "base/stl_util-inl.h"
+#include "build/build_config.h"
+#include "chrome/browser/parsers/metadata_parser_factory.h"
+#include "chrome/browser/parsers/metadata_parser_jpeg_factory.h"
+
+static const int kAmountToRead = 256;
+
+// Gets the singleton
+MetadataParserManager* MetadataParserManager::Get() {
+    // Uses the LeakySingletonTrait because cleanup is optional.
+    return
+        Singleton<MetadataParserManager,
+        LeakySingletonTraits<MetadataParserManager> >::get();
+  }
+
+bool MetadataParserManager::RegisterParserFactory(
+    MetadataParserFactory* parser) {
+  factories_.push_back(parser);
+  return true;
+}
+
+MetadataParserManager::MetadataParserManager() {
+  MetadataParserJpegFactory *factory = new MetadataParserJpegFactory();
+  RegisterParserFactory(factory);
+}
+
+MetadataParserManager::~MetadataParserManager() {
+  STLDeleteContainerPointers(factories_.begin(), factories_.end());
+}
+
+MetadataParser* MetadataParserManager::GetParserForFile(const FilePath& path) {
+
+  char buffer[kAmountToRead];
+  int amount_read = 0;
+  DLOG(ERROR) << path.value();
+  amount_read = file_util::ReadFile(path, buffer, sizeof(buffer));
+  if (amount_read <= 0) {
+    DLOG(ERROR) << "Unable to read file";
+    return NULL;
+  }
+  for (size_t x = 0; x < factories_.size(); ++x) {
+    if (factories_[x]->CanParse(path, buffer, amount_read)) {
+      return factories_[x]->CreateParser(path);
+    }
+  }
+  return NULL;
+}