1 files changed, 46 insertions, 0 deletions
diff --git a/chrome/browser/extensions/external_extension_provider.h b/chrome/browser/extensions/external_extension_provider.h
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+++ b/chrome/browser/extensions/external_extension_provider.h
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+// Copyright (c) 2009 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_EXTERNAL_EXTENSION_PROVIDER_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_PROVIDER_H_
+
+#include <set>
+#include <string>
+
+#include "base/version.h"
+#include "chrome/common/extensions/extension.h"
+
+class FilePath;
+
+// This class is an abstract class for implementing external extensions
+// providers.
+class ExternalExtensionProvider {
+ public:
+  // ExternalExtensionProvider uses this interface to communicate back to the
+  // caller what extensions are registered, and which |id|, |version| and |path|
+  // they have. See also VisitRegisteredExtension below. Ownership of |version|
+  // is not transferred to the visitor.
+  class Visitor {
+   public:
+     virtual void OnExternalExtensionFound(const std::string& id,
+                                           const Version* version,
+                                           const FilePath& path) = 0;
+  };
+
+  virtual ~ExternalExtensionProvider() {}
+
+  // Enumerate registered extension, calling OnExternalExtensionFound on
+  // the |visitor| object for each registered extension found. |ids_to_ignore|
+  // contains a list of extension ids that should not result in a call back.
+  virtual void VisitRegisteredExtension(
+      Visitor* visitor, const std::set<std::string>& ids_to_ignore) const = 0;
+
+  // Gets the version of extension with |id| and its |location|. |location| can
+  // be NULL. The caller is responsible for cleaning up the Version object
+  // returned. This function returns NULL if the extension is not found.
+  virtual Version* RegisteredVersion(std::string id,
+                                     Extension::Location* location) const = 0;
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_PROVIDER_H_