1 files changed, 65 insertions, 0 deletions
diff --git a/src/file_cache.cc b/src/file_cache.cc
new file mode 100644
index 0000000..fe16c3b
--- /dev/null
+++ b/src/file_cache.cc
@@ -0,0 +1,65 @@
+// 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.
+
+// +build ignore
+
+#include "file_cache.h"
+
+#include <unordered_map>
+
+#include "file.h"
+
+static MakefileCacheManager* g_instance;
+
+MakefileCacheManager::MakefileCacheManager() {}
+
+MakefileCacheManager::~MakefileCacheManager() {}
+
+MakefileCacheManager* MakefileCacheManager::Get() {
+  return g_instance;
+}
+
+class MakefileCacheManagerImpl : public MakefileCacheManager {
+ public:
+  MakefileCacheManagerImpl() { g_instance = this; }
+
+  virtual ~MakefileCacheManagerImpl() {
+    for (auto p : cache_) {
+      delete p.second;
+    }
+  }
+
+  virtual Makefile* ReadMakefile(const string& filename) override {
+    Makefile* result = NULL;
+    auto p = cache_.emplace(filename, result);
+    if (p.second) {
+      p.first->second = result = new Makefile(filename);
+    } else {
+      result = p.first->second;
+    }
+    return result;
+  }
+
+  virtual void GetAllFilenames(unordered_set<string>* out) override {
+    for (const auto& p : cache_)
+      out->insert(p.first);
+  }
+
+ private:
+  unordered_map<string, Makefile*> cache_;
+};
+
+MakefileCacheManager* NewMakefileCacheManager() {
+  return new MakefileCacheManagerImpl();
+}