/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this    except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.flowable.management.jmx;

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Saeid Mirzaei
 */

public class Utils {

    private static final Logger LOGGER = LoggerFactory.getLogger(Utils.class);

    public static String getHostName() {

        final String DEFAULT_HOST = "localhost";

        String hostName = null;
        boolean canAccessSystemProps = true;
        try {
            // we'll do it this way mostly to determine if we should lookup the hostName
            SecurityManager sm = System.getSecurityManager();
            if (sm != null) {
                sm.checkPropertiesAccess();
            }
        } catch (SecurityException se) {
            canAccessSystemProps = false;
        }

        if (canAccessSystemProps) {
            try {
                hostName = InetAddress.getLocalHost().getHostName();
            } catch (UnknownHostException uhe) {
                LOGGER.info("Cannot determine localhost name. Fallback to: " + DEFAULT_HOST, uhe);
                hostName = DEFAULT_HOST;
            }
        } else {
            hostName = DEFAULT_HOST;
        }
        return hostName;
    }

}
