package com.epam.wilma.webapp.helper;
/*==========================================================================
Copyright 2013-2017 EPAM Systems
This file is part of Wilma.
Wilma is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Wilma is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Wilma. If not, see <http://www.gnu.org/licenses/>.
===========================================================================*/
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
* Class that resolves the given IP address to its host name.
* @author Adam_Csaba_Kiraly
*
*/
@Component
public class IpAddressResolver {
private static final String DEBUG_MESSAGE = "Host could not be resolved: ";
private static final String UNKNOWN_HOST_TEMPLATE = "UNKNOWN HOST(%s)";
private final Logger logger = LoggerFactory.getLogger(IpAddressResolver.class);
@Autowired
private InetAddressFactory inetAddressFactory;
/**
* Returns the host name that belongs to the given IP address.
* @param ip the IP address to resolve
* @return the host name or if it's not found then the String: UNKNOWN HOST(ip) , where ip is the the given ip to resolve
*/
public String resolveToHostName(final String ip) {
String host = "";
try {
InetAddress address = inetAddressFactory.createByName(ip);
host = address.getHostName();
} catch (UnknownHostException e) {
logger.debug(DEBUG_MESSAGE + host, e);
host = String.format(UNKNOWN_HOST_TEMPLATE, ip);
}
return host;
}
}