// ConfigFile.dn
// This component reads config files ({properties: values}) and collects the values.
// Author: Roberto Rodrigues Filho
// August @ 2015

component provides util.ConfigFile requires io.TextFile, data.StringUtil strUtil, data.adt.HashTable {
	
	HashTable tableInfo
	
	ConfigFile:ConfigFile(char configFile[]) {
		TextFile file = new TextFile(configFile, File.READ)
		
		if (file == null) {
			throw new Exception("File '$configFile' not found")
		}
		
		tableInfo = new HashTable()
		
		char line[]
		int start
		char key[]
		char value[]
		
		while ((line = file.readLine()) != null) {
			start = strUtil.find(line, new char[](":"))			
			key = strUtil.trim(strUtil.subString(line, 0, start))
			value = strUtil.trim(strUtil.subString(line, start++,
				line.arrayLength-start))

			tableInfo.put(key, new String(value))
		}
		
		file.close()
	}

	char[] ConfigFile:getValue(char property[]) {
		String str = tableInfo.get(property)
		
		if (str != null) {
			return str.string
		} else {
			return null
		}
	}

}