// Copyright 2003-2005 Arthur van Hoff, Rick Blair
   // Licensed under Apache License version 2.0
   // Original license LGPL
   
   package javax.jmdns.impl.tasks.resolver;
   
   import java.io.IOException;
   
   import javax.jmdns.ServiceInfo;
  import javax.jmdns.impl.DNSOutgoing;
  import javax.jmdns.impl.DNSQuestion;
  import javax.jmdns.impl.DNSRecord;
  import javax.jmdns.impl.JmDNSImpl;
  import javax.jmdns.impl.constants.DNSConstants;
  import javax.jmdns.impl.constants.DNSRecordClass;
  import javax.jmdns.impl.constants.DNSRecordType;
  
  /**
   * The ServiceResolver queries three times consecutively for services of a given type, and then removes itself from the timer.
   * <p/>
   * The ServiceResolver will run only if JmDNS is in state ANNOUNCED. REMIND: Prevent having multiple service resolvers for the same type in the timer queue.
   */
  public class ServiceResolver extends DNSResolverTask {
  
      private final String _type;
  
      public ServiceResolver(JmDNSImpl jmDNSImpl, String type) {
          super(jmDNSImpl);
          this._type = type;
      }
  
      /*
       * (non-Javadoc)
       * @see javax.jmdns.impl.tasks.DNSTask#getName()
       */
      @Override
      public String getName() {
          return "ServiceResolver(" + (this.getDns() != null ? this.getDns().getName() : "") + ")";
      }
  
      /*
       * (non-Javadoc)
       * @see javax.jmdns.impl.tasks.Resolver#addAnswers(javax.jmdns.impl.DNSOutgoing)
       */
      @Override
      protected DNSOutgoing addAnswers(DNSOutgoing out) throws IOException {
          DNSOutgoing newOut = out;
          long now = System.currentTimeMillis();
          for (ServiceInfo info : this.getDns().getServices().values()) {
              newOut = this.addAnswer(newOut, new DNSRecord.Pointer(info.getType(), DNSRecordClass.CLASS_IN, DNSRecordClass.NOT_UNIQUE, DNSConstants.DNS_TTL, info.getQualifiedName()), now);
              // newOut = this.addAnswer(newOut, new DNSRecord.Service(info.getQualifiedName(), DNSRecordClass.CLASS_IN, DNSRecordClass.NOT_UNIQUE, DNSConstants.DNS_TTL, info.getPriority(), info.getWeight(), info.getPort(),
              // this.getDns().getLocalHost().getName()), now);
          }
          return newOut;
      }
  
      /*
       * (non-Javadoc)
       * @see javax.jmdns.impl.tasks.Resolver#addQuestions(javax.jmdns.impl.DNSOutgoing)
       */
      @Override
      protected DNSOutgoing addQuestions(DNSOutgoing out) throws IOException {
          DNSOutgoing newOut = out;
          newOut = this.addQuestion(newOut, DNSQuestion.newQuestion(_type, DNSRecordType.TYPE_PTR, DNSRecordClass.CLASS_IN, DNSRecordClass.NOT_UNIQUE));
          // newOut = this.addQuestion(newOut, DNSQuestion.newQuestion(_type, DNSRecordType.TYPE_SRV, DNSRecordClass.CLASS_IN, DNSRecordClass.NOT_UNIQUE));
          return newOut;
      }
  
      /*
       * (non-Javadoc)
       * @see javax.jmdns.impl.tasks.Resolver#description()
       */
      @Override
      protected String description() {
          return "querying service";
      }
  }