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// Copyright (c) 2010 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.
#ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
#define CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
#pragma once
#include <string>
#include "base/file_path.h"
#include "base/platform_thread.h"
// Represents a resource inside an extension. For example, an image, or a
// JavaScript file. This is more complicated than just a simple FilePath
// because extension resources can come from multiple physical file locations
// depending on locale.
class ExtensionResource {
public:
ExtensionResource();
ExtensionResource(const std::string& extension_id,
const FilePath& extension_root,
const FilePath& relative_path);
// Returns actual path to the resource (default or locale specific). In the
// browser process, this will DCHECK if not called on the file thread. To
// easily load extension images on the UI thread, see ImageLoadingTracker.
const FilePath& GetFilePath() const;
// Gets the physical file path for the extension resource, taking into account
// localization. In the browser process, this will DCHECK if not called on the
// file thread. To easily load extension images on the UI thread, see
// ImageLoadingTracker.
static FilePath GetFilePath(const FilePath& extension_root,
const FilePath& relative_path);
// Gets the file path on any thread. Unlike GetFilePath(), these can be called
// from any thread without DCHECKing.
//
// In the browser process, calling this method is almost always wrong. Use
// GetFilePath() on the file thread instead.
const FilePath& GetFilePathOnAnyThreadHack() const;
static FilePath GetFilePathOnAnyThreadHack(const FilePath& extension_root,
const FilePath& relative_path);
// Setter for the proper thread to run file tasks on.
static void set_file_thread_id(PlatformThreadId thread_id) {
file_thread_id_ = thread_id;
check_for_file_thread_ = true;
}
// Checks whether we are running on the file thread and DCHECKs if not. Relies
// on set_file_thread_id being called first, otherwise, it will not DCHECK.
static void CheckFileAccessFromFileThread();
// Getters
const std::string& extension_id() const { return extension_id_; }
const FilePath& extension_root() const { return extension_root_; }
const FilePath& relative_path() const { return relative_path_; }
bool empty() { return extension_root().empty(); }
// Unit test helpers.
FilePath::StringType NormalizeSeperators(FilePath::StringType path) const;
bool ComparePathWithDefault(const FilePath& path) const;
private:
// The id of the extension that this resource is associated with.
std::string extension_id_;
// Extension root.
FilePath extension_root_;
// Relative path to resource.
FilePath relative_path_;
// Full path to extension resource. Starts empty.
mutable FilePath full_resource_path_;
// The thread id for the file thread. If set, GetFilePath() and related
// methods will DCHECK that they are on this thread when called.
static PlatformThreadId file_thread_id_;
// Whether to check for file thread. See |file_thread_id_|. If set,
// GetFilePath() and related methods will DCHECK that they are on this thread
// when called.
static bool check_for_file_thread_;
};
#endif // CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
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