NIODNSQueryResult.java

package org.commoncrawl.io;

import java.net.InetAddress;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.commoncrawl.io.NIODNSQueryClient.Status;

/** DNSQueryResult - the end result of a DNS Query operation */
public class NIODNSQueryResult {

  /** logging **/
  static final Log LOG = LogFactory.getLog(NIODNSQueryResult.class);
  
  /** SUCCESS or FAILURE */
  private Status                _status = Status.RESOLVER_FAILURE;
  /** error description **/
  private String					_errorDesc = "";
  /** the target host name */
  private String                _hostName;
  /** the returnrelated ed CNAME */
  private String                _cname;
  /** the returned InetAddress*/
  private InetAddress           _address;
  /** the returned ttl value **/
  private long                    _ttl;
  /** the associated status callback */
  private NIODNSQueryClient     _client;
  
  NIODNSResolver _source = null;
  
  /** constructor
   * 
   * @param client   - callback interface into the client
   * @param hostName - host name associated with this query  
   */ 
  public NIODNSQueryResult(NIODNSResolver source,NIODNSQueryClient client,String hostName){ 
    _source = source;
    _client = client;
    _hostName = hostName;
  }
  
  
  public void fireCallback() { 
    NIODNSQueryClient client = getConnection();
    
    if (client != null) { 
      
      if (success()) { 
        client.AddressResolutionSuccess(_source,getHostName(),getCName(),getAddress(),getTTL());
      }
      else { 
        client.AddressResolutionFailure(_source,getHostName(),getStatus(),getErrorDescription());
      }
    }
    else {
      if (getHostName() != null)
        LOG.error("Client no Longer Exists for DNS Resolution Request:" + getHostName());
      else 
        LOG.error("Client no Longer Exists for DNS Resolution Request");
    }
  }
  
  public final void setStatus(Status theStatus) { _status = theStatus; }
  public final Status getStatus() { return _status; }
  public final boolean success() { return _status == Status.SUCCESS; }
  
  public String getErrorDescription() {
    if (_errorDesc != null)
      return _errorDesc;
    return "";
  }
  public void setErrorDesc(String errorDesc) { _errorDesc = errorDesc; }
  
  public final void setAddress(InetAddress address) { _address = address; }
  public final InetAddress getAddress() { return _address; }
  
  public final long getTTL() { return _ttl; }
  public final void setTTL(long ttlValue) { _ttl =ttlValue;  }
  
  public final String getHostName() { return _hostName; }
  
  public final String getCName() { return _cname; }
  public final void  setCName(String cname) { _cname = cname; }
  
  public final NIODNSQueryClient getConnection() { return _client; }
  
}