text: // Copyright (c) 2011 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.
  
  // Interface for objects providing content setting rules.
  
  #ifndef COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_RULE_H_
  #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_RULE_H_
  
  #include <memory>
  #include <vector>
  
  #include "base/compiler_specific.h"
  #include "base/macros.h"
  #include "base/synchronization/lock.h"
  #include "base/values.h"
  #include "components/content_settings/core/common/content_settings_constraints.h"
  #include "components/content_settings/core/common/content_settings_pattern.h"
  
  namespace content_settings {
  
  struct Rule {
    Rule();
    Rule(const ContentSettingsPattern& primary_pattern,
         const ContentSettingsPattern& secondary_pattern,
         base::Value value,
         base::Time expiration,
         SessionModel session_model);
  
    Rule(const Rule&) = delete;
    Rule& operator=(const Rule&) = delete;
  
    Rule(Rule&& other);
    Rule& operator=(Rule&& other);
  
    ~Rule();
  
    ContentSettingsPattern primary_pattern;
    ContentSettingsPattern secondary_pattern;
    base::Value value;
    base::Time expiration;
    SessionModel session_model;
  };
  
  class RuleIterator {
   public:
    virtual ~RuleIterator();
    virtual bool HasNext() const = 0;
    virtual Rule Next() = 0;
  };
  
  class ConcatenationIterator : public RuleIterator {
   public:
    // |auto_lock| can be null if no locking is needed.
    ConcatenationIterator(std::vector<std::unique_ptr<RuleIterator>> iterators,
                          base::AutoLock* auto_lock);
    ~ConcatenationIterator() override;
    bool HasNext() const override;
    Rule Next() override;
  
   private:
    std::vector<std::unique_ptr<RuleIterator>> iterators_;
    std::unique_ptr<base::AutoLock> auto_lock_;
  };
  
  }  // namespace content_settings
  
  #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_RULE_H_
  