supportclass.cs

支持向量机程序,非常有用,可以供大家实验使用,改进.希望能多大家工作有帮助.

//
// In order to convert some functionality to Visual C#, the Java Language Conversion Assistant
// creates "support classes" that duplicate the original functionality.  
//
// Support classes replicate the functionality of the original code, but in some cases they are 
// substantially different architecturally. Although every effort is made to preserve the 
// original architecture of the application in the converted project, the user should be aware that 
// the primary goal of these support classes is to replicate functionality, and that at times 
// the architecture of the resulting solution may differ somewhat.
//

using System;

/// <summary>
/// Contains conversion support elements such as classes, interfaces and static methods.
/// </summary>
public class SupportClass
{
	//Provides access to a static System.Random class instance
	static public System.Random Random = new System.Random();

	/*******************************/
	/// <summary>
	/// The class performs token processing from strings
	/// </summary>
	public class Tokenizer
	{
		//Element list identified
		private System.Collections.ArrayList elements;
		//Source string to use
		private string source;
		//The tokenizer uses the default delimiter set: the space character, the tab character, the newline character, and the carriage-return character
		private string delimiters = " \t\n\r";		

		/// <summary>
		/// Initializes a new class instance with a specified string to process
		/// </summary>
		/// <param name="source">String to tokenize</param>
		public Tokenizer(string source)
		{			
			this.elements = new System.Collections.ArrayList();
			this.elements.AddRange(source.Split(this.delimiters.ToCharArray()));
			this.RemoveEmptyStrings();
			this.source = source;
		}

		/// <summary>
		/// Initializes a new class instance with a specified string to process
		/// and the specified token delimiters to use
		/// </summary>
		/// <param name="source">String to tokenize</param>
		/// <param name="delimiters">String containing the delimiters</param>
		public Tokenizer(string source, string delimiters)
		{
			this.elements = new System.Collections.ArrayList();
			this.delimiters = delimiters;
			this.elements.AddRange(source.Split(this.delimiters.ToCharArray()));
			this.RemoveEmptyStrings();
			this.source = source;
		}

		/// <summary>
		/// Current token count for the source string
		/// </summary>
		public int Count
		{
			get
			{
				return (this.elements.Count);
			}
		}

		/// <summary>
		/// Determines if there are more tokens to return from the source string
		/// </summary>
		/// <returns>True or false, depending if there are more tokens</returns>
		public bool HasMoreTokens()
		{
			return (this.elements.Count > 0);			
		}

		/// <summary>
		/// Returns the next token from the token list
		/// </summary>
		/// <returns>The string value of the token</returns>
		public string NextToken()
		{			
			string result;
			if (source == "") throw new System.Exception();
			else
			{
				this.elements = new System.Collections.ArrayList();
				this.elements.AddRange(this.source.Split(delimiters.ToCharArray()));
				RemoveEmptyStrings();		
				result = (string) this.elements[0];
				this.elements.RemoveAt(0);				
				this.source = this.source.Remove(this.source.IndexOf(result),result.Length);
				this.source = this.source.TrimStart(this.delimiters.ToCharArray());
				return result;					
			}			
		}

		/// <summary>
		/// Returns the next token from the source string, using the provided
		/// token delimiters
		/// </summary>
		/// <param name="delimiters">String containing the delimiters to use</param>
		/// <returns>The string value of the token</returns>
		public string NextToken(string delimiters)
		{
			this.delimiters = delimiters;
			return NextToken();
		}

		/// <summary>
		/// Removes all empty strings from the token list
		/// </summary>
		private void RemoveEmptyStrings()
		{
			for (int index=0; index < this.elements.Count; index++)
				if ((string)this.elements[index]== "")
				{
					this.elements.RemoveAt(index);
					index--;
				}
		}
	}

}