ENH: add cache manager class, move all commands into cmCommands.cxx to speed up compile times, share a .lib with the command line and mfc versions.

Source/cmCacheManager.h

@@ -0,0 +1,72 @@
+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+
+  Copyright (c) 2000 National Library of Medicine
+  All rights reserved.
+
+  See COPYRIGHT.txt for copyright details.
+
+=========================================================================*/
+#ifndef cmCacheManager_h
+#define cmCacheManager_h
+
+#include "cmStandardIncludes.h"
+
+/** \class cmCacheManager
+ * \brief Control class for cmake's cache
+ *
+ * Load and Save CMake cache files.
+ * 
+ */
+class cmCacheManager
+{
+public:
+  /**
+   * Types for the cache entries.  These are useful as
+   * hints for a cache editor program.  Path should bring
+   * up a file chooser, BOOL a check box, and STRING a 
+   * text entry box.
+   */
+  enum CacheEntryType{ BOOL=0, PATH, STRING  };
+  static CacheEntryType StringToType(const char*);
+  /**
+   * Singleton pattern get instance of the cmCacheManager.
+   */
+  static cmCacheManager* GetInstance();
+  /**
+   * Load a cache from file
+   */
+  bool LoadCache(const char* path);
+  
+  /**
+   * Save the cache to a file
+   */
+  bool SaveCache(const char* path);
+  
+  /**
+   * Add an entry into the cache
+   */
+  void AddCacheEntry(const char* key, const char* value, CacheEntryType type);
+  
+  /**
+   * Get a value from the cache given a key
+   */
+  const char* GetCacheValue(const char* key);
+private:
+  static cmCacheManager* s_Instance;
+  class CacheEntry
+  {
+  public:
+    std::string m_Value;
+    CacheEntryType m_Type;
+  };
+  std::map<std::string, CacheEntry> m_Cache;
+};
+
+#endif