base/version.h

// 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_