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Diffstat (limited to 'base/path_service.h')
| -rw-r--r-- | base/path_service.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/base/path_service.h b/base/path_service.h new file mode 100644 index 0000000..861c9b5 --- /dev/null +++ b/base/path_service.h @@ -0,0 +1,85 @@ +// Copyright 2008, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#ifndef BASE_PATH_SERVICE_H__ +#define BASE_PATH_SERVICE_H__ + +#include <string> + +#include "base/base_paths.h" + +// The path service is a global table mapping keys to file system paths. It is +// OK to use this service from multiple threads. +// +class PathService { + public: + // Retrieves a path to a special directory or file and places it into the + // string pointed to by 'path'. If you ask for a directory it is guaranteed + // to NOT have a path separator at the end. For example, "c:\windows\temp" + // Directories are also guaranteed to exist when this function succeeds. + // + // Returns true if the directory or file was successfully retrieved. On + // failure, 'path' will not be changed. + static bool Get(int key, std::wstring* path); + + // Overrides the path to a special directory or file. This cannot be used to + // change the value of DIR_CURRENT, but that should be obvious. Also, if the + // path specifies a directory that does not exist, the directory will be + // created by this method. This method returns true if successful. + // + // If the given path is relative, then it will be resolved against DIR_CURRENT. + // + // WARNING: Consumers of PathService::Get may expect paths to be constant + // over the lifetime of the app, so this method should be used with caution. + static bool Override(int key, const std::wstring& path); + + // Return whether a path was overridden. + static bool IsOverridden(int key); + + // Sets the current directory. + static bool SetCurrentDirectory(const std::wstring& current_directory); + + // To extend the set of supported keys, you can register a path provider, + // which is just a function mirroring PathService::Get. The ProviderFunc + // returns false if it cannot provide a non-empty path for the given key. + // Otherwise, true is returned. + // + // WARNING: This function could be called on any thread from which the + // PathService is used, so a the ProviderFunc MUST BE THREADSAFE. + // + typedef bool (*ProviderFunc)(int, std::wstring*); + + // Call to register a path provider. You must specify the range "[key_start, + // key_end)" of supported path keys. + static void RegisterProvider(ProviderFunc provider, + int key_start, + int key_end); +}; + +#endif // BASE_PATH_SERVICE_H__ |