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+// Copyright 2015 Google Inc. All rights reserved
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef FILE_CACHE_H_
+#define FILE_CACHE_H_
+
+#include <string>
+#include <unordered_set>
+
+using namespace std;
+
+class Makefile;
+
+class MakefileCacheManager {
+ public:
+ virtual ~MakefileCacheManager();
+
+ virtual Makefile* ReadMakefile(const string& filename) = 0;
+ virtual void GetAllFilenames(unordered_set<string>* out) = 0;
+
+ static MakefileCacheManager* Get();
+
+ protected:
+ MakefileCacheManager();
+};
+
+MakefileCacheManager* NewMakefileCacheManager();
+
+#endif // FILE_CACHE_H_