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 // Copyright (c) 2012 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 BASE_VERSION_H_

 #define BASE_VERSION_H_

 #include <string>

 #include <vector>

 #include "base/base_export.h"

 #include "base/basictypes.h"

 namespace base {

 // Version represents a dotted version number, like "1.2.3.4", supporting

 // parsing and comparison.

 class BASE_EXPORT Version {

  public:

   // The only thing you can legally do to a default constructed

   // Version object is assign to it.

   Version();

   ~Version();

   // Initializes from a decimal dotted version number, like "0.1.1".

   // Each component is limited to a uint16. Call IsValid() to learn

   // the outcome.

   explicit Version(const std::string& version_str);

   // Returns true if the object contains a valid version number.

   bool IsValid() const;

   // Returns true if the version wildcard string is valid. The version wildcard

   // string may end with ".*" (e.g. 1.2.*, 1.*). Any other arrangement with "*"

   // is invalid (e.g. 1.*.3 or 1.2.3*). This functions defaults to standard

   // Version behavior (IsValid) if no wildcard is present.

   static bool IsValidWildcardString(const std::string& wildcard_string);

   // Commonly used pattern. Given a valid version object, compare if a

   // |version_str| results in a newer version. Returns true if the

   // string represents valid version and if the version is greater than

   // than the version of this object.

   bool IsOlderThan(const std::string& version_str) const;

   bool Equals(const Version& other) const;

   // Returns -1, 0, 1 for <, ==, >.

   int CompareTo(const Version& other) const;

   // Given a valid version object, compare if a |wildcard_string| results in a

   // newer version. This function will default to CompareTo if the string does

   // not end in wildcard sequence ".*". IsValidWildcard(wildcard_string) must be

   // true before using this function.

   int CompareToWildcardString(const std::string& wildcard_string) const;

   // Return the string representation of this version.

   const std::string GetString() const;

   const std::vector<uint16>& components() const { return components_; }

  private:

   std::vector<uint16> components_;

 };

 }  // namespace base

 // TODO(xhwang) remove this when all users are updated to explicitly use the

 // namespace

 using base::Version;

 #endif  // BASE_VERSION_H_