Separate the archive cache out to ArchiveFactory.

atom/common/asar/archive_factory.cc

@@ -0,0 +1,29 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/common/asar/archive_factory.h"
+
+#include "atom/common/asar/archive.h"
+#include "base/stl_util.h"
+
+namespace asar {
+
+ArchiveFactory::ArchiveFactory() {}
+
+ArchiveFactory::~ArchiveFactory() {}
+
+scoped_refptr<Archive> ArchiveFactory::GetOrCreate(const base::FilePath& path) {
+  // Create a cache of Archive.
+  if (!ContainsKey(archives_, path)) {
+    scoped_refptr<Archive> archive(new Archive(path));
+    if (!archive->Init())
+      return NULL;
+    archives_[path] = archive;
+    return archive;
+  }
+
+  return archives_[path];
+}
+
+}  // namespace asar

atom/common/asar/archive_factory.h

@@ -0,0 +1,31 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_COMMON_ASAR_ARCHIVE_FACTORY_H_
+#define ATOM_COMMON_ASAR_ARCHIVE_FACTORY_H_
+
+#include "base/containers/hash_tables.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+
+namespace asar {
+
+class Archive;
+
+class ArchiveFactory {
+ public:
+  ArchiveFactory();
+  virtual ~ArchiveFactory();
+
+  scoped_refptr<Archive> GetOrCreate(const base::FilePath& path);
+
+ private:
+  base::hash_map<base::FilePath, scoped_refptr<Archive> > archives_;  // NOLINT
+
+  DISALLOW_COPY_AND_ASSIGN(ArchiveFactory);
+};
+
+}  // namespace asar
+
+#endif  // ATOM_COMMON_ASAR_ARCHIVE_FACTORY_H_