- added files to write to and read from configuration files

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@724 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/key_file.cc

@@ -0,0 +1,108 @@
+// src/global_preferences.cc - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#include "config.h"
+#include "key_file.hh"
+#include <fstream>
+#include <string.h>
+
+
+namespace sgpem
+{
+
+  KeyFile::KeyFile()
+  {}
+  
+  
+  KeyFile::elements_iterator
+  KeyFile::elements_begin() const
+  {
+    return _elements.begin();
+  }
+  
+  
+  KeyFile::elements_iterator
+  KeyFile::elements_end() const
+  {
+    return _elements.end();
+  }
+  
+  
+  void
+  KeyFile::insert_key_value(const Glib::ustring& key, const Glib::ustring& value)
+  {
+    std::map<Glib::ustring, Glib::ustring>::value_type val_pair(key, value);
+    _elements.insert(val_pair);
+  }
+
+  
+  const Glib::ustring*
+  KeyFile::search_value(const Glib::ustring& key)
+  {
+    const Glib::ustring* ret = 0;
+    elements_iterator cur  = _elements.find(key);
+    if(cur != elements_end())
+    {
+      ret = &((*cur).second);
+    }
+    return ret;
+  }
+  
+  void
+  KeyFile::file_read(const Glib::ustring& filename)
+  {
+    std::ifstream ifs(filename.c_str());
+    if(ifs)
+    {
+      _elements.clear(); // erase all elements
+      char buff[KEY_FILE_BUF_LEN]; //
+      while(ifs)
+      {
+        ifs.getline(buff, sizeof(buff));
+
+        // if not a comment line...
+        if(*buff!='\0' && *buff!='#')
+        {
+          char* pos = strchr(buff, '=');
+          if(pos!=0)
+          {
+            *pos = '\0';
+            const Glib::ustring key(buff);
+            const Glib::ustring value(pos+1);
+            insert_key_value(key, value);
+          }
+        } // end - if not a comment line...
+      } // end - while(ifs)
+    } // end - if(ifs)
+  }
+  
+  void
+  KeyFile::file_write(const Glib::ustring& filename)
+  {
+    std::ofstream ofs(filename.c_str());
+    if(ofs)
+    {
+      elements_iterator iter;
+      for(iter = elements_begin(); iter != elements_end(); iter++){
+        ofs << (*iter).first << "=" << (*iter).second << std::endl;
+      }
+    } // end - if(ofs)
+  }
+}

src/backend/key_file.hh

@@ -0,0 +1,96 @@
+// src/backend/key_file.hh - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#ifndef KEY_FILE_HH
+#define KEY_FILE_HH 1
+
+#define KEY_FILE_BUF_LEN 1000
+
+#include <glibmm/ustring.h>
+#include <map>
+#include "config.h"
+
+namespace sgpem
+{
+  class KeyFile;
+
+
+  
+  /** \brief Save and retrieve configuration files formatted as key=value rows.
+   *
+   * This class handles files to store and retrieve configuration preferences
+   * in the form of: key=value rows.
+   *
+   * The methods exposed allow to insert a key/value pair,
+   * get a value by its corresponding key, write all pairs to a file,
+   * read pairs from a file.
+   *
+   * Key values cannot contain the equal to (=) char nor start with pound (#).
+   * Reading files, empty lines and lines starting with # are ignored.
+   *
+   */
+  class SG_DLLEXPORT KeyFile
+  {
+
+  public:
+    /** \brief Elements iterator type definition. */
+    typedef std::map<Glib::ustring, Glib::ustring>::const_iterator elements_iterator;
+
+    /** \brief Object constructor */
+    KeyFile();
+
+    /** \brief Elements iterator (begin of container) initializer. */
+    elements_iterator elements_begin() const;
+    
+    /** \brief Elements iterator (end of container) initializer */
+    elements_iterator elements_end() const;
+
+    /** \brief Insert a new key/value pair.
+     *
+     * \param key The key value to insert.
+     * \param value The value associated to the key inserted.
+     */
+    void insert_key_value(const Glib::ustring& key, const Glib::ustring& value);
+    
+    /** \brief Insert a new key/value pair.
+     *
+     * \param key The key value to insert.
+     * \return A pointer to the value associated to the searched key or 0 if not found.
+     */
+    const Glib::ustring* search_value(const Glib::ustring& key);
+
+    /** \brief Read a file into this object.
+     *
+     * \param filename The file to read from.
+     */
+    void file_read(const Glib::ustring& filename);
+    
+    /** \brief Write a file from this object.
+     *
+     * \param filename The file to write to.
+     */
+    void file_write(const Glib::ustring& filename);
+  private:
+
+    std::map<Glib::ustring, Glib::ustring>  _elements;
+  };
+}
+
+#endif