using System;
using System.Collections;

namespace Spider
{
	/// <summary>
	/// The AttributeList class is used to store list of
	/// Attribute classes.
	/// 
	/// This spider is copyright 2003 by Jeff Heaton. However, it is
	/// released under a Limited GNU Public License (LGPL). You may 
	/// use it freely in your own programs. For the latest version visit
	/// http://www.jeffheaton.com.
	///
	/// </summary>
	/// 	public class AttributeList:Attribute
	{		/// <summary>
		/// An internally used Vector.  This vector contains
		/// the entire list of attributes.
		/// </summary>		protected ArrayList m_list;		/// <summary>
		/// Make an exact copy of this object using the cloneable interface.
		/// </summary>
		/// <returns>A new object that is a clone of the specified object.</returns>		public override Object Clone()		{			AttributeList rtn = new AttributeList();						for ( int i=0;i<m_list.Count;i++ )				rtn.Add( (Attribute)this[i].Clone() );			return rtn;		}		/// <summary>
		/// Create a new, empty, attribute list.
		/// </summary>		public AttributeList():base("","")		{			m_list = new ArrayList();		}		/// <summary>
		/// Add the specified attribute to the list of attributes.
		/// </summary>
		/// <param name="a">An attribute to add to this AttributeList.</param>		public void Add(Attribute a)		{			m_list.Add(a);		}		/// <summary>
		/// Clear all attributes from this AttributeList and return it
		/// to a empty state.
		/// </summary>		public void Clear()		{			m_list.Clear();		}		/// <summary>
		/// Returns true of this AttributeList is empty, with no attributes.
		/// </summary>
		/// <returns>True if this AttributeList is empty, false otherwise.</returns>		public bool IsEmpty()		{			return( m_list.Count<=0);		}		/// <summary>
		/// If there is already an attribute with the specified name,
		/// then it will have its value changed to match the specified value.
		/// If there is no Attribute with the specified name, then one will
		/// be created.  This method is case-insensitive.
		/// </summary>
		/// <param name="name">The name of the Attribute to edit or create.  Case-insensitive.</param>
		/// <param name="value">The value to be held in this attribute.</param>		public void Set(string name,string value)		{			if ( name==null )				return;			if ( value==null )				value="";			Attribute a = this[name];			if ( a==null ) 
			{				a = new Attribute(name,value);				Add(a);			} 
			else				a.Value = value;		}		/// <summary>
		/// How many attributes are in this AttributeList
		/// </summary>		public int Count		{			get 			{				return m_list.Count;			}		}		/// <summary>
		/// A list of the attributes in this AttributeList
		/// </summary>		public ArrayList List		{			get 			{				return m_list;			}		}		/// <summary>
		/// Access the individual attributes
		/// </summary>		public Attribute this[int index]		{			get 			{				if ( index<m_list.Count )					return(Attribute)m_list[index];				else					return null;			}		}		/// <summary>
		/// Access the individual attributes by name.
		/// </summary>		public Attribute this[string index]		{			get 			{				int i=0;				while ( this[i]!=null ) 
				{					if ( this[i].Name.ToLower().Equals( (index.ToLower()) ))						return this[i];					i++;				}				return null;			}		}	}
}