DataNode*
MasterCVReader::readConfigFile(string fileName)
{
DataNode* parentNode = NULL;
DataNode* curNode = NULL;
FILE* conf;
Attribute attrib;
MasterCVState state;
char lastCharacter;
string token;
state = WAIT_FOR_OPEN_BRACKET;
try
{
// Check if the codec was set or not
if (!m_codec)
{
throw Exception("MasterCVReader::readConfigFile() : fatal error codec was not set properly", 1);
}
// State machine implement configuration reader
conf = fopen(fileName.c_str(), "r");
if (conf)
{
while (!feof(conf))
{
switch(state) {
case WAIT_FOR_OPEN_BRACKET:
char c;
c = 0;
c = m_codec->getNextChar(conf);
if (c == 0 && feof(conf) && curNode->dataNodeComplete)
{
return curNode;
}
if (m_codec->blankCharacter(c))
{
state = WAIT_FOR_OPEN_BRACKET;
break;
}
if (c == '<')
{
state = WAIT_FOR_DATANODE_NAME;
}
else
{
string msg;
msg.append("MasterCVReader::readConfigFile() : Invalid configuration file expect < instead of");
msg.append(1, c);
throw Exception(msg, 2);
}
break;
case WAIT_FOR_DATANODE_NAME:
lastCharacter = 0;
token.clear();
m_codec->getNextToken(conf, token, lastCharacter);
if (token.empty())
{
if (feof(conf) && curNode->dataNodeComplete)
{
return curNode;
}
else if (lastCharacter == '/')
{
if (!curNode->dataNodeComplete)
{
state = WAIT_FOR_CLOSE_DATANODE_NAME;
}
else
{
string msg;
msg.append("MasterCVReader::readConfigFile() : Duplicate close tag for ");
msg.append(curNode->getNodeName());
throw Exception(msg);
}
}
else
{
throw Exception("MasterCVReader::readConfigFile() : Invalid DataNode Name", 2);
}
}
else
{
if (!curNode) // This is actually root node
{
curNode = new DataNode();
}
else
{
parentNode = curNode;
curNode = new DataNode();
}
if (curNode)
{
if (parentNode)
{
parentNode->addChild(curNode);
}
curNode->dataNodeComplete = false;
curNode->setNodeName(token);
if (lastCharacter == ' ')
{
state = WAIT_FOR_ATTRIBUTE_NAME;
}
else if (lastCharacter == '>')
{
// parentNode = curNode;
state = WAIT_FOR_OPEN_BRACKET;
}
else if (lastCharacter == '/')
{
char c = 0;
c = m_codec->getNextChar(conf);
if (c == '>')
{
curNode->dataNodeComplete = true;
if (parentNode)
{
curNode = parentNode;
parentNode = curNode->getParentNode();
}
state = WAIT_FOR_OPEN_BRACKET;
}
else
{
throw Exception("MasterCVReader::readConfigFile() : Invalid configuration file expect > after /", 1);
}
}
else
{
string msg;
msg.append("MasterCVReader::readConfigFile() : Invalid character after");
msg.append(token);
throw Exception(msg, 2);
}
}
else
{
throw Exception("MasterCVReader::readConfigFile() : Cannot allocate memory for new node", 1);
}
}
break;
case WAIT_FOR_ATTRIBUTE_NAME:
lastCharacter = 0;
token.clear();
m_codec->getNextToken(conf, token, lastCharacter);
if (token.empty())
{
if (lastCharacter == '=')
{
throw Exception("MasterCVReader::readConfigFile() : Attribute with NULL name is not allowed", 1);
}
else
{
string msg;
msg.append("MasterCVReader::readConfigFile() : Invalid atrribute name for ");
msg.append(curNode->getNodeName());
throw Exception(msg, 2);
}
}
else
{
attrib.name = token;
state = WAIT_FOR_ATTRIBUTE_VALUE;
}
break;
case WAIT_FOR_ATTRIBUTE_VALUE:
lastCharacter = 0;
token.clear();
m_codec->getNextToken(conf, token, lastCharacter);
if (token.empty())
{
string msg;
msg.append("MasterCVReader::readConfigFile() : Invalid atrribute name for ");
msg.append(curNode->getNodeName());
throw Exception(msg, 2);
}
else
{
attrib.value = token;
curNode->addAttribute(attrib);
if (lastCharacter == ' ')
{
state = WAIT_FOR_ATTRIBUTE_NAME;
}
else if (lastCharacter == '>')
{
// parentNode = curNode;
state = WAIT_FOR_OPEN_BRACKET;
}
else if (lastCharacter == '/')
{
char c = 0;
c = m_codec->getNextChar(conf);
if (c == '>')
{
curNode->dataNodeComplete = true;
if (parentNode)
{
curNode = parentNode;
parentNode = curNode->getParentNode();
}
state = WAIT_FOR_OPEN_BRACKET;
}
else
{
throw Exception("MasterCVReader::readConfigFile() : Invalid configuration file expect > after /", 2);
}
}
}
break;
case WAIT_FOR_CLOSE_DATANODE_NAME:
lastCharacter = 0;
token.clear();
m_codec->getNextToken(conf, token, lastCharacter);
if (!token.empty())
{
if (!token.compare(curNode->getNodeName()))
{
if (curNode->dataNodeComplete)
{
string msg;
msg.append("MasterCVReader::readConfigFile() : Duplicate close tag for ");
msg.append(curNode->getNodeName());
throw Exception(msg);
}
else
{
curNode->dataNodeComplete = true;
if (parentNode)
{
curNode = parentNode;
parentNode = curNode->getParentNode();
}
state = WAIT_FOR_OPEN_BRACKET;
}
}
else
{
string msg;
msg.append("MasterCVReader::readConfigFile() : Mismatch close tag expect ");
msg.append(curNode->getNodeName());
msg.append(" found ");
msg.append(token);
throw Exception(msg, 2);
}
}
else
{
throw Exception("MasterCVReader::readConfigFile() : Invalid close tag name");
}
break;
}
}
fclose(conf);
return curNode;
}
else
{
throw Exception("fatal error cannot open configuration file", 2);
}
}
catch (Exception err)
{
if (err.logLevel == 1)
{
if (conf)
{
fclose(conf);
}
}
Util::log(err);
return NULL;
}
}
