/**
* Loads the mapper with the specified name if it is not already loaded.
*
* @param name
* @return The requested mapper.
* @throws ConfigurationException
* @throws IOException
*/
public synchronized ConceptMapper loadMapper(String name)
throws ConfigurationException, IOException {
if (env.hasMapper(name)) {
return env.getMapper(name);
}
info("loading mapper " + name);
JSONObject params = configuration.getMapper(name);
String type = requireString(params, "type");
ConceptMapper mapper;
if (type.equals("dictionary")) {
mapper = getDictionaryMapper(name);
} else if (type.equals("lucene")) {
mapper = getLuceneMapper(name);
} else if (type.equals("ensemble")) {
mapper = getEnsembleMapper(name);
} else if (type.equals("title")) {
mapper = getTitleMapper(name);
} else {
throw new ConfigurationException("unknown type for mapper " + name + ": " + type);
}
env.addMapper(name, mapper);
return mapper;
}
