properties_base.h

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/*
 * Copyright 2006-2008 The FLWOR Foundation.
 * 
 * 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 ZORBA_PROPERTIES_BASE_H
#define ZORBA_PROPERTIES_BASE_H

#include <string>
#include <sstream>
#include <iostream>
#include <vector>
#include <cctype>
#include <zorba/config.h>

namespace zorba {

class PropertiesBase {
protected:
  std::vector<std::string > __thePositionalArgs;

public:
  virtual ~PropertiesBase () {}

  virtual const char **get_all_options () const = 0;
  virtual std::string load_argv (int argc, const char **argv) = 0;
  virtual std::string check_args () { return ""; }

  virtual std::string load_all (const char *cfgname, const std::string &env_pfx, int argc, const char **argv) {
    std::string result;
    if (! (result = load_env (env_pfx)).empty ())
      return result;
    if (! (result = load_file (cfgname)).empty ())
      return result;
    return load_argv (argc, argv);
  }

  virtual std::string load_env (const std::string &env_pfx, const char **options);
  virtual std::string load_env (const std::string &env_pfx) { return load_env (env_pfx, get_all_options ()); }
  std::string load_file (const char *fname);

  const std::vector<std::string > &getPositionalArgs () const { return __thePositionalArgs; }

  void copy_args (const char **argv) {
    for (; *argv != NULL; ++argv) {
      __thePositionalArgs.push_back (*argv);
    }
  }

  template<class T> void init_val (const char *str, T &val, unsigned delta = 0) {
    std::istringstream is (str + delta);
    is >> val;
  }

};

template<> void PropertiesBase::init_val (const char *str, std::string &val, unsigned delta);
template<> void PropertiesBase::init_val (const char *str, std::vector<std::string> &val, unsigned delta);

}

#endif  // ZORBA_PROPERTIES_BASE_H
/*
 * Local variables:
 * mode: c++
 * End:
 */