import com.datastax.driver.core.DataType.Name; //导入依赖的package包/类
private Object convertKey(K key) {
	if (keyType.getName() == Name.BIGINT) {
		return key;
	} else if (keyType.getName() == Name.TEXT) {
		return key.toString();
	} else {
		throw new RuntimeException("Unhandled DataType: " + keyType);
	}
}
 

import com.datastax.driver.core.DataType.Name; //导入依赖的package包/类
private List<?> convertKeys(Set<K> keys) {
	if (keyType.getName() == Name.BIGINT) {
		return new ArrayList<>(keys);
	} else if (keyType.getName() != Name.TEXT) {
		throw new RuntimeException("Unhandled DataType: " + keyType);
	}

	List<Object> convertedKeys = new ArrayList<>(keys.size());

	for (K key : keys) {
		convertedKeys.add(key.toString());
	}

	return convertedKeys;
}