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+/**-*-C++-*-
+ * \file
+ * \author Idar Tollefsen <idart@hotmail.com>
+ *
+ * \brief Creates a compilation database and caches it.
+ *
+ * Keeps a cache of the loaded compilation database, only creating a new
+ * one when needed.
+ *
+ * This file is distributed under the GNU General Public License.
+ * See COPYING for details.
+ */
+
+#ifndef IRONY_MODE_COMPDBCACHE_H_
+#define IRONY_MODE_COMPDBCACHE_H_
+
+#include "support/CIndex.h"
+#include "support/NonCopyable.h"
+
+#include <ctime>
+#include <string>
+
+class CompDBCache : public util::NonCopyable {
+public:
+  CompDBCache();
+  ~CompDBCache();
+
+  /**
+   * \brief Get a compilation database from a database found in a directory.
+   *
+   * This in essence a wrapper around
+   * \c clang_CompilationDatabase_fromDirectory() with added caching.
+   * It will either create a new compilation database or return the
+   * already loaded one (if any).
+   *
+   * This class owns the resulting compilation database.
+   * Therefore, unlike \c clang_CompilationDatabase_fromDirectory(),
+   * callers must NOT call \c clang_CompilationDatabase_dispose() on the
+   * returned compilation database. This class will handle that internally.
+   *
+   * \param buildDir Directory containing the database (such as
+   *                 "compile_commands.json") to create a compilation
+   *                 database from.
+   * \param error Error code from attempting to create a compilation
+   *              database (\c CXCompilationDatabase_NoError on success).
+   *
+   * \return The compilation database or nullptr.
+   */
+  CXCompilationDatabase fromDirectory(const std::string &buildDir,
+                                      CXCompilationDatabase_Error *error);
+
+private:
+  /**
+   * \brief Clear the cache.
+   *
+   * This will dispose the currently loaded compilation database (if any) by
+   * calling \c clang_CompilationDatabase_dispose() on it. And it will reset
+   * other internal housekeeping variables related to the caching of the
+   * compilation database.
+   */
+  void clear();
+
+  /**
+   * \brief Construct JSON compilation database filename.
+   *
+   * \param buildDir Directory that might contain "compile_commands.json".
+   *
+   * \return Path to "compilation_commands.json" in \c buildDir.
+   */
+  std::string constructJsonDbFilename(const std::string &buildDir) const;
+
+  /**
+   * \brief Get modification time of a file.
+   *
+   * \param filename The file to get last modification time of.
+   *
+   * \return The modification time of \c filename or 0.
+   */
+  time_t modificationTime(const std::string &filename) const;
+
+  CXCompilationDatabase db_;
+  std::string filename_;
+  time_t mtime_;
+};
+
+#endif