public ScriptHandler getHandler(String key) {
		for (ScriptHandler handler : scriptHandlers) {
			if (StringUtils.equals(handler.getKey(), key)) {
				return handler;
			}
		}
		// Actually nothing is reach here.
		throw processException("no matching handler for " + key);
	}
Get the appropriate {@link ScriptHandler} for the given key.

@param key	ScriptHandler key
@return {@link ScriptHandler}. {@link NullScriptHandler} if none is available.
ngrinder-controller/src/main/java/org/ngrinder/script/handler/ScriptHandlerFactory.java