context: //
  // System.Runtime.Versioning.FrameworkName class
  //
  // Authors
  //	Marek Habersack <mhabersack@novell.com>
  //
  // Copyright (C) 2009 Novell, Inc (http://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 System.Text;
  
  #if NET_4_0
  namespace System.Runtime.Versioning
  {
  	[Serializable]
  	public sealed class FrameworkName : IEquatable <FrameworkName>
  	{		
  		string fullName;
  		int? hashCode;
  		
  		public string FullName {
  			get {
  				if (fullName == null) {
  					var sb = new StringBuilder (Identifier);
  					sb.Append (",Version=v");
  					sb.Append (Version.ToString ());
  
  					string profile = Profile;
  					if (!String.IsNullOrEmpty (profile)) {
  						sb.Append (",Profile=");
  						sb.Append (profile);
  					}
  
  					fullName = sb.ToString ();
  				}
  
  				return fullName;
  			}
  		}
  		
  		public string Identifier {
  			get; private set;
  		}
  
  		public string Profile {
  			get; private set;
  		}
  		
  		public Version Version {
  			get; private set;
  		}
  		
  		public FrameworkName (string frameworkName)
  		{
  			if (frameworkName == null)
  				throw new ArgumentNullException ("frameworkName");
  
  			if (frameworkName.Length == 0)
  				throw new ArgumentException ("The parameter 'frameworkName' cannot be an empty string.", "frameworkName");
  
  			this.Profile = String.Empty;
  			ParseFrameworkName (frameworkName);
  		}
  
  		public FrameworkName (string identifier, Version version)
  			: this (identifier, version, String.Empty)
  		{
  		}
  
  		public FrameworkName (string identifier, Version version, string profile)
  		{
  			if (identifier == null)
  				throw new ArgumentNullException ("identifier");
  
  			if (version == null)
  				throw new ArgumentNullException ("version");
  
  			if (identifier.Length == 0)
  				throw new ArgumentException ("The parameter 'identifier' cannot be an empty string.", "identifier");
  			
  			this.Identifier = identifier;
  			this.Version = version;
  			if (profile == null)
  				this.Profile = String.Empty;
  			else
  				this.Profile = profile;
  		}
  
  		public bool Equals (FrameworkName other)
  		{
  			if (Object.ReferenceEquals (other, null))
  				return false;
  
  			return (other.Version == this.Version &&
  				String.Compare (other.Identifier, this.Identifier, StringComparison.Ordinal) == 0 &&
  				String.Compare (other.Profile, this.Profile, StringComparison.Ordinal) == 0);
  		}
  
  		public override bool Equals (object obj)
  		{
  			return Equals (obj as FrameworkName);
  		}
  
  		public override int GetHashCode ()
  		{
  			if (hashCode == null) {
  				hashCode = Version.GetHashCode () ^ Identifier.GetHashCode ();
  				string profile = Profile;
  				if (profile != null)
  					hashCode ^= profile.GetHashCode ();
  			}
  			
  			return (int)hashCode;
  		}
  
  		public override string ToString ()
  		{
  			return FullName;
  		}
  
  		public static bool operator == (FrameworkName left, FrameworkName right)
  		{
  			if (((object)left) == null && ((object)right) == null)
  				return true;
  
  			if (((object)left) == null || ((object)right) == null)
  				return false;
  
  			return left.Equals (right);
  		}
  
  		public static bool operator != (FrameworkName left, FrameworkName right)
  		{
  			if (((object)left) == null && ((object)right) == null)
  				return false;
  
  			if (((object)left) == null || ((object)right) == null)
  				return true;
  
  			return !left.Equals (right);
  		}
  		
  		void ParseFrameworkName (string frameworkName)
  		{
  			string[] parts = frameworkName.Split (',');
  			int len = parts.Length;
  
  			if (len < 2 || len > 3)
  				throw new ArgumentException ("FrameworkName cannot have less than two components or more than three components.");
  
  			bool invalid = false;
  			string part;
  			string[] splitPart;
  			int splen;
  			
  			for (int i = 0; i < len; i++) {
  				part = parts [i].Trim ();
  				if (part.Length == 0) {
  					invalid = true;
  					break;
  				}
  
  				splitPart = part.Split ('=');
  				splen = splitPart.Length;
  				
  				if (String.Compare ("version", splitPart [0], StringComparison.OrdinalIgnoreCase) == 0) {
  					if (i == 0 || splen != 2) {
  						invalid = true;
  						break;
  					}					
  
  					try {
  						char first = splitPart [1][0];
  						if (first == 'v' || first == 'V')
  							splitPart [1] = splitPart [1].Substring (1);
  						this.Version = new Version (splitPart [1]);
  					} catch (Exception ex) {
  						throw new ArgumentException ("FrameworkName version component is invalid.", ex);
  					}					
  
  					continue;
  				}
  
  				if (String.Compare ("profile", splitPart [0], StringComparison.OrdinalIgnoreCase) == 0) {
  					if (i == 0) {
  						invalid = true;
  						break;
  					}
  
  					if (splen > 1)
  
gt: 						Profile = String.Join ("=", splitPart, 1, splen - 1);