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comparison: ipc/chromium/src/base/path_service.h
ipc/chromium/src/base/path_service.h
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| 1 // Copyright (c) 2006-2008 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 #ifndef BASE_PATH_SERVICE_H__ | |
| 6 #define BASE_PATH_SERVICE_H__ | |
| 7 | |
| 8 #include "build/build_config.h" | |
| 9 #ifdef OS_WIN | |
| 10 // TODO(erikkay): this should be removable, but because SetCurrentDirectory | |
| 11 // is the name of a Windows function, it gets macro-ized to SetCurrentDirectoryW | |
| 12 // by windows.h, which leads to a different name in the header vs. the impl. | |
| 13 // Even if we could fix that, it would still hose all callers of the function. | |
| 14 // The right thing is likely to rename. | |
| 15 #include <windows.h> | |
| 16 #endif | |
| 17 | |
| 18 #include <string> | |
| 19 | |
| 20 #include "base/base_paths.h" | |
| 21 | |
| 22 class FilePath; | |
| 23 | |
| 24 // The path service is a global table mapping keys to file system paths. It is | |
| 25 // OK to use this service from multiple threads. | |
| 26 // | |
| 27 class PathService { | |
| 28 public: | |
| 29 // Retrieves a path to a special directory or file and places it into the | |
| 30 // string pointed to by 'path'. If you ask for a directory it is guaranteed | |
| 31 // to NOT have a path separator at the end. For example, "c:\windows\temp" | |
| 32 // Directories are also guaranteed to exist when this function succeeds. | |
| 33 // | |
| 34 // Returns true if the directory or file was successfully retrieved. On | |
| 35 // failure, 'path' will not be changed. | |
| 36 static bool Get(int key, FilePath* path); | |
| 37 // This version, producing a wstring, is deprecated and only kept around | |
| 38 // until we can fix all callers. | |
| 39 static bool Get(int key, std::wstring* path); | |
| 40 | |
| 41 // Overrides the path to a special directory or file. This cannot be used to | |
| 42 // change the value of DIR_CURRENT, but that should be obvious. Also, if the | |
| 43 // path specifies a directory that does not exist, the directory will be | |
| 44 // created by this method. This method returns true if successful. | |
| 45 // | |
| 46 // If the given path is relative, then it will be resolved against | |
| 47 // DIR_CURRENT. | |
| 48 // | |
| 49 // WARNING: Consumers of PathService::Get may expect paths to be constant | |
| 50 // over the lifetime of the app, so this method should be used with caution. | |
| 51 static bool Override(int key, const std::wstring& path); | |
| 52 | |
| 53 // Return whether a path was overridden. | |
| 54 static bool IsOverridden(int key); | |
| 55 | |
| 56 // Sets the current directory. | |
| 57 static bool SetCurrentDirectory(const std::wstring& current_directory); | |
| 58 | |
| 59 // To extend the set of supported keys, you can register a path provider, | |
| 60 // which is just a function mirroring PathService::Get. The ProviderFunc | |
| 61 // returns false if it cannot provide a non-empty path for the given key. | |
| 62 // Otherwise, true is returned. | |
| 63 // | |
| 64 // WARNING: This function could be called on any thread from which the | |
| 65 // PathService is used, so the ProviderFunc MUST BE THREADSAFE. | |
| 66 // | |
| 67 typedef bool (*ProviderFunc)(int, FilePath*); | |
| 68 | |
| 69 // Call to register a path provider. You must specify the range "[key_start, | |
| 70 // key_end)" of supported path keys. | |
| 71 static void RegisterProvider(ProviderFunc provider, | |
| 72 int key_start, | |
| 73 int key_end); | |
| 74 private: | |
| 75 static bool GetFromCache(int key, FilePath* path); | |
| 76 static void AddToCache(int key, const FilePath& path); | |
| 77 | |
| 78 }; | |
| 79 | |
| 80 #endif // BASE_PATH_SERVICE_H__ |
