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luosheng
318
Technosoftware/DaAeHdaClient/OpcUrl.cs
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318
Technosoftware/DaAeHdaClient/OpcUrl.cs
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#region Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
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//-----------------------------------------------------------------------------
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// Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
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// Web: https://www.technosoftware.com
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//
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// The source code in this file is covered under a dual-license scenario:
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// - Owner of a purchased license: SCLA 1.0
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// - GPL V3: everybody else
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//
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// SCLA license terms accompanied with this source code.
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// See SCLA 1.0: https://technosoftware.com/license/Source_Code_License_Agreement.pdf
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//
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// GNU General Public License as published by the Free Software Foundation;
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// version 3 of the License are accompanied with this source code.
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// See https://technosoftware.com/license/GPLv3License.txt
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//
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// This source code is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE.
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//-----------------------------------------------------------------------------
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#endregion Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
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#region Using Directives
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using System;
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using System.Net;
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#endregion
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namespace Technosoftware.DaAeHdaClient
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{
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/// <summary>
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/// Contains information required to connect to the OPC server.
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/// </summary>
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[Serializable]
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public class OpcUrl : ICloneable
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{
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#region Constructors, Destructor, Initialization
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/// <summary>
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/// Initializes an empty instance.
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/// </summary>
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public OpcUrl()
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{
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Scheme = OpcUrlScheme.HTTP;
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HostName = "localhost";
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Port = 0;
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Path = null;
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}
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/// <summary>
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/// Initializes an instance by providing OPC specification, OPC URL scheme and an URL string.
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/// </summary>
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/// <param name="specification">A description of an interface version defined by an OPC specification.</param>
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/// <param name="scheme">The scheme (protocol) for the URL</param>
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/// <param name="url">The URL of the OPC server.</param>
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public OpcUrl(OpcSpecification specification, string scheme, string url)
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{
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Specification = specification;
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HostName = "localhost";
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Port = 0;
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Path = null;
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ParseUrl(url);
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Scheme = scheme;
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}
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/// <summary>
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/// Initializes an instance by parsing an URL string.
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/// </summary>
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/// <param name="url">The URL of the OPC server.</param>
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public OpcUrl(string url)
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{
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Scheme = OpcUrlScheme.HTTP;
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HostName = "localhost";
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Port = 0;
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Path = null;
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ParseUrl(url);
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}
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#endregion
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#region Properties
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/// <summary>
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/// The supported OPC specification.
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/// </summary>
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public OpcSpecification Specification { get; set; }
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/// <summary>
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/// The scheme (protocol) for the URL
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/// </summary>
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public string Scheme { get; set; }
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/// <summary>
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/// The host name for the URL.
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/// </summary>
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public string HostName { get; set; }
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/// <summary>
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/// The port name for the URL (0 means default for protocol).
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/// </summary>
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public int Port { get; set; }
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/// <summary>
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/// The path for the URL.
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/// </summary>
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public string Path { get; set; }
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#endregion
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#region Object Method Overrides
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/// <summary>
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/// Returns a URL string for the object.
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/// </summary>
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public override string ToString()
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{
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var hostName = string.IsNullOrEmpty(HostName) ? "localhost" : HostName;
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if (Port > 0)
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{
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return $"{Scheme}://{hostName}:{Port}/{Path}";
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}
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else
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{
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return $"{Scheme}://{hostName}/{Path}";
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}
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}
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/// <summary>
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/// Compares the object to either another URL object or a URL string.
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/// </summary>
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public override bool Equals(object target)
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{
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OpcUrl url;
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if (target != null && target.GetType() == typeof(OpcUrl))
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{
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url = (OpcUrl)target;
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}
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else
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{
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url = null;
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}
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if (target != null && target.GetType() == typeof(string))
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{
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url = new OpcUrl((string)target);
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}
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if (url == null) return false;
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if (url.Path != Path) return false;
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if (url.Scheme != Scheme) return false;
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if (url.HostName != HostName) return false;
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if (url.Port != Port) return false;
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return true;
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}
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/// <summary>
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/// Returns a hash code for the object.
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/// </summary>
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public override int GetHashCode()
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{
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return ToString().GetHashCode();
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}
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#endregion
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#region ICloneable Members
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/// <summary>
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/// Returns a deep copy of the object.
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/// </summary>
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public virtual object Clone()
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{
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return MemberwiseClone();
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}
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#endregion
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#region Private Methods
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private void ParseUrl(string url)
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{
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var buffer = url;
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// extract the scheme (default is http).
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var index = buffer.IndexOf("://", StringComparison.Ordinal);
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if (index >= 0)
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{
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Scheme = buffer.Substring(0, index);
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buffer = buffer.Substring(index + 3);
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}
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index = buffer.IndexOfAny(new[] { '/' });
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if (index < 0)
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{
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Path = buffer;
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return;
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}
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var hostPortString = buffer.Substring(0, index);
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IPAddress.TryParse(hostPortString, out var address);
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if (address != null && address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
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{
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if (hostPortString.Contains("]"))
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{
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HostName = hostPortString.Substring(0, hostPortString.IndexOf("]", StringComparison.Ordinal) + 1);
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if (hostPortString.Substring(hostPortString.IndexOf(']')).Contains(":"))
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{
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var portString = hostPortString.Substring(hostPortString.LastIndexOf(':') + 1);
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if (portString != "")
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{
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try
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{
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Port = Convert.ToUInt16(portString);
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}
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catch
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{
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Port = 0;
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}
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}
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else
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{
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Port = 0;
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}
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}
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else
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{
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Port = 0;
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}
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Path = buffer.Substring(index + 1);
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}
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else
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{
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HostName = $"[{hostPortString}]";
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Port = 0;
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}
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Path = buffer.Substring(index + 1);
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}
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else
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{
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// extract the hostname (default is localhost).
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index = buffer.IndexOfAny(new[] { ':', '/' });
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if (index < 0)
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{
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Path = buffer;
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return;
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}
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HostName = buffer.Substring(0, index);
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// extract the port number (default is 0).
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if (buffer[index] == ':')
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{
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buffer = buffer.Substring(index + 1);
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index = buffer.IndexOf("/", StringComparison.Ordinal);
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string port;
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if (index >= 0)
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{
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port = buffer.Substring(0, index);
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buffer = buffer.Substring(index + 1);
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}
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else
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{
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port = buffer;
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buffer = "";
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}
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try
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{
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Port = Convert.ToUInt16(port);
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}
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catch
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{
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Port = 0;
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}
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}
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else
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{
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buffer = buffer.Substring(index + 1);
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}
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// extract the path.
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Path = buffer;
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// In case the specification is not set, we try to find it out based on the Scheme
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if (Specification.Id == null)
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{
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if (Scheme == OpcUrlScheme.DA)
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{
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Specification = OpcSpecification.OPC_DA_20;
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return;
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}
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if (Scheme == OpcUrlScheme.AE)
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{
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Specification = OpcSpecification.OPC_AE_10;
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return;
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}
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if (Scheme == OpcUrlScheme.HDA)
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{
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Specification = OpcSpecification.OPC_HDA_10;
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return;
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}
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if (Scheme == OpcUrlScheme.HTTP)
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{
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Specification = OpcSpecification.XML_DA_10;
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}
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}
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}
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}
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#endregion
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}
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}
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