Mono.Zeroconf – Rev 1

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//
// ServiceBrowser.cs
//
// Authors:
//    Aaron Bockover  <abockover@novell.com>
//
// Copyright (C) 2006-2007 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using AV=Avahi;
using Mono.Zeroconf;

namespace Mono.Zeroconf.Providers.Avahi
{
    public class ServiceBrowser : IServiceBrowser
    {
        private AV.Client client;
        private AV.ServiceBrowser browser;
    
        public event ServiceBrowseEventHandler ServiceAdded;
        public event ServiceBrowseEventHandler ServiceRemoved;
    
        public ServiceBrowser()
        {
        }
        
        public void Dispose()
        {
            if(client != null) {
                client.Dispose();
                client = null;
            }
            
            if(browser != null) {
                browser.Dispose();
                browser = null;
            }
        }
    
        public void Browse(string regtype, string domain)
        {
            Dispose();
            
            client = new AV.Client();
            
            browser = new AV.ServiceBrowser(client, regtype, domain);
            browser.ServiceAdded += OnServiceAdded;
            browser.ServiceRemoved += OnServiceRemoved;
        }
        
        private void OnServiceAdded(object o, AV.ServiceInfoArgs args)
        {
            ServiceBrowseEventHandler handler = ServiceAdded;
            if(handler != null) {
                handler(this, new ServiceBrowseEventArgs(new ResolvableService(client, args.Service)));
            }
        }
        
        private void OnServiceRemoved(object o, AV.ServiceInfoArgs args)
        {
            ServiceBrowseEventHandler handler = ServiceRemoved;
            if(handler != null) {
                handler(this, new ServiceBrowseEventArgs(new ResolvableService(client, args.Service)));
            }
        }
    }
}