Inheritance diagram for FWXMLConfigParser:

Public Member Functions
FWConfiguration *	config (void)
virtual void	data (const std::string &data)
virtual void	endElement (const std::string &tag)
	FWXMLConfigParser (istream &f)
void	pushConfig (Attributes &attributes)
virtual void	startElement (const std::string &tag, Attributes &attributes)
Private Types
enum	STATES { IN_BEGIN_DOCUMENT, IN_PUSHED_CONFIG, IN_POPPED_CONFIG, IN_BEGIN_STRING, IN_STORED_STRING }
Private Attributes
std::vector< std::pair < std::string, FWConfiguration * > >	m_configs
std::string	m_currentConfigName
std::auto_ptr< FWConfiguration >	m_first
enum STATES	m_state

Detailed Description

Helper class which reads the XML configuration and constructs the FWConfiguration classes.

State machine for the parser can be found by cut and pasting the following in graphviz.

digraph { IN_BEGIN_DOCUMENT->IN_PUSHED_CONFIG [label = "beginElement(config)"]

IN_PUSHED_CONFIG->IN_PUSHED_CONFIG [label = "beginElement(config)"] IN_PUSHED_CONFIG->IN_POPPED_CONFIG [label = "endElement(config)"] IN_PUSHED_CONFIG->IN_BEGIN_STRING [label = "beginElement(string)"]

IN_POPPED_CONFIG->IN_PUSHED_CONFIG [label = "beginElement(config)"] IN_POPPED_CONFIG->IN_POPPED_CONFIG [label = "endElement(config)"] IN_POPPED_CONFIG->DONE [label = "top level config popped"]

IN_BEGIN_STRING->IN_STORED_STRING [label = "data()"]; IN_BEGIN_STRING->IN_PUSHED_CONFIG [label = "endElement(string)"]

IN_STORED_STRING->IN_PUSHED_CONFIG [label = "endElement(string)"] }

Definition at line 200 of file FWConfigurationManager.cc.

Member Enumeration Documentation

enum FWXMLConfigParser::STATES [private]

Enumerator:

IN_BEGIN_DOCUMENT
IN_PUSHED_CONFIG
IN_POPPED_CONFIG
IN_BEGIN_STRING
IN_STORED_STRING

Definition at line 202 of file FWConfigurationManager.cc.

               {
        IN_BEGIN_DOCUMENT,
        IN_PUSHED_CONFIG,
        IN_POPPED_CONFIG,
        IN_BEGIN_STRING,
        IN_STORED_STRING
      };

Constructor & Destructor Documentation

FWXMLConfigParser::FWXMLConfigParser ( istream & f ) [inline]

Definition at line 211 of file FWConfigurationManager.cc.

   : SimpleSAXParser(f),
     m_state(IN_BEGIN_DOCUMENT),
     m_first(0)
   {}

Member Function Documentation

FWConfiguration* FWXMLConfigParser::config ( void ) [inline]

The parsed configuration. Notice that the parser owns it and destroys it when destroyed.

Definition at line 331 of file FWConfigurationManager.cc.

References m_first.

   {
      return m_first.get();
   }

virtual void FWXMLConfigParser::data ( const std::string & data ) [inline, virtual]

Executes any transaction in the state machine which happens when the xml parser finds some data (i.e. text) between tags This is mainly used to handle <string> element contents but also whitespace between tags.

Reimplemented from SimpleSAXParser.

Definition at line 314 of file FWConfigurationManager.cc.

References debug_config_state_machine(), IN_BEGIN_STRING, IN_STORED_STRING, m_configs, and m_state.

   {
      debug_config_state_machine("data", data, m_state);
      // We ignore whitespace but complain about any text which is not 
      // in the <string> tag.
      if (m_state == IN_BEGIN_STRING)
      {
         m_configs.back().second->addValue(data);
         m_state = IN_STORED_STRING;
      }
      else if (strspn(data.c_str(), " \t\n") != data.size())
         throw ParserError("Unexpected text " + data);
   }

virtual void FWXMLConfigParser::endElement ( const std::string & tag ) [inline, virtual]

Executes any transaction in the state machine which happens when the xml parser closes an element.

Notice that we need to do addKeyValue on endElement (and carry around the FWConfigutation name) because of the "copy by value" policy of addKeyValue addition which would add empty FWConfiguration objects if done on startElement.

Reimplemented from SimpleSAXParser.

Definition at line 283 of file FWConfigurationManager.cc.

References cond::rpcobimon::current, debug_config_state_machine(), IN_BEGIN_STRING, IN_POPPED_CONFIG, IN_PUSHED_CONFIG, IN_STORED_STRING, combine::key, m_configs, and m_state.

   {
      debug_config_state_machine("end", tag, m_state);
      if (m_state == IN_PUSHED_CONFIG || m_state == IN_POPPED_CONFIG)
      {
         if (tag != "config")
            throw ParserError("Wrong closing tag found " + tag);
         
         FWConfiguration *current = m_configs.back().second;
         std::string key = m_configs.back().first;
         m_configs.pop_back();
         if (!m_configs.empty())
            m_configs.back().second->addKeyValue(key, *current);
         m_state = IN_POPPED_CONFIG;
      }
      else if (m_state == IN_BEGIN_STRING && tag == "string")
      {
         m_configs.back().second->addValue("");
         m_state = IN_PUSHED_CONFIG;
      }       
      else if (m_state == IN_STORED_STRING && tag == "string")
         m_state = IN_PUSHED_CONFIG;
      else
         throw ParserError("Wrong closing tag found " + tag);
   }

void FWXMLConfigParser::pushConfig ( Attributes & attributes ) [inline]

Pushes the configuration on stack eventually

Definition at line 218 of file FWConfigurationManager.cc.

References asciidump::attr, i, SimpleSAXParser::Attribute::key, m_configs, mergeVDriftHistosByStation::name, SimpleSAXParser::Attribute::value, and BeamSplash_cfg::version.

Referenced by startElement().

   {
      std::string name;
      int version = 0;
      for (size_t i = 0, e = attributes.size(); i != e; ++i)
      {
         Attribute &attr = attributes[i];
         if (attr.key == "name")
            name = attr.value;
         else if (attr.key == "version")
         {
           char *endptr;
           version = strtol(attr.value.c_str(), &endptr, 10);
           if (endptr == attr.value.c_str())
             throw ParserError("Version must be an integer.");
         }
         else
            throw ParserError("Unexpected attribute " + attr.key);
      }
      m_configs.push_back(std::make_pair(name, new FWConfiguration(version)));
   }

virtual void FWXMLConfigParser::startElement	(	const std::string &	tag,
		Attributes &	attributes
	)		`[inline, virtual]`

Executes any transaction in the state machine which happens when the xml parser finds an new element.

Reimplemented from SimpleSAXParser.

Definition at line 244 of file FWConfigurationManager.cc.

References debug_config_state_machine(), IN_BEGIN_DOCUMENT, IN_BEGIN_STRING, IN_POPPED_CONFIG, IN_PUSHED_CONFIG, m_configs, m_first, m_state, and pushConfig().

   {
      debug_config_state_machine("start", tag, m_state);
      if (m_state == IN_BEGIN_DOCUMENT)
      {
         if (tag != "config")
            throw ParserError("Expecting toplevel <config> tag");
         pushConfig(attributes);
         m_first.reset(m_configs.back().second);
         m_state = IN_PUSHED_CONFIG;
      }
      else if (m_state == IN_PUSHED_CONFIG)
      {
         if (tag == "config")
            pushConfig(attributes);
         else if (tag == "string")
            m_state = IN_BEGIN_STRING;
         else
            throw ParserError("Unexpected element " + tag);
      }
      else if (m_state == IN_POPPED_CONFIG)
      {
         if (tag != "config")
            throw ParserError("Unexpected element " + tag);
         pushConfig(attributes);
         m_state = IN_PUSHED_CONFIG;
      }
      else
         throw ParserError("Wrong opening tag found " + tag);
   }