Implementation of beginning of Declarative Web Request API backend

chrome/browser/extensions/api/declarative_webrequest/webrequest_rule.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 CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULE_H_
+#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULE_H_
+#pragma once
+
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/extensions/api/declarative/rules_registry.h"
+
+namespace extensions {
+class URLMatcherConditionFactory;
+class WebRequestConditionSet;
+class WebRequestActionSet;
+}
+
+namespace extensions {
+
+// Representation of a rule of the declarative Web Request API
+class WebRequestRule {
+ public:
+  typedef std::string ExtensionId;
+  typedef std::string RuleId;
+  typedef std::pair<ExtensionId, RuleId> GlobalRuleId;
+
+  WebRequestRule(const GlobalRuleId& id,
+                 scoped_ptr<WebRequestConditionSet> conditions,
+                 scoped_ptr<WebRequestActionSet> actions);
+  virtual ~WebRequestRule();
+
+  // If |error| is empty, the translation was successful and the returned
+  // rule is internally consistent.
+  static scoped_ptr<WebRequestRule> Create(
+      URLMatcherConditionFactory* url_matcher_condition_factory,
+      const std::string& extension_id,
+      linked_ptr<RulesRegistry::Rule> rule,
+      std::string* error);
+
+  const GlobalRuleId& id() const { return id_; }
+  const WebRequestConditionSet& conditions() const { return *conditions_; }
+  const WebRequestActionSet& actions() const { return *actions_; }
+
+ private:
+  // Checks whether the set of |conditions| and |actions| are consistent,
+  // meaning for example that we do not allow combining an |action| that needs
+  // to be executed before the |condition| can be fulfilled.
+  // Returns true in case of consistency and MUST set |error| otherwise.
+  static bool CheckConsistency(WebRequestConditionSet* conditions,
+                               WebRequestActionSet* actions,
+                               std::string* error);
+
+  GlobalRuleId id_;
+  scoped_ptr<WebRequestConditionSet> conditions_;
+  scoped_ptr<WebRequestActionSet> actions_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRequestRule);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULE_H_