package org.robsite.extension.rss.model;
   
   
   import java.net.MalformedURLException;
   import java.net.URL;
   import java.util.ArrayList;
   import java.util.Collection;
   import java.util.Collections;
   import java.util.Date;
  import java.util.Iterator;
  import java.util.List;
  import javax.swing.SwingUtilities;
  import org.xml.sax.SAXException;
  
  public class Channel 
  {
    private String  _title;
    private String  _link;
    private String  _description;
    private List    _items;
    private boolean _open;
    private String  _url;
    
    // Implement HTTP conditional get, as documented here:
    // http://fishbowl.pastiche.org/2002/10/21/http_conditional_get_for_rss_hackers
    private String  _httpLastModified;
    private String  _httpEtag;
    
    /***
     * Future flag to indicate a channel added by the user. These won't be
     * automatically deleted when we synch with the channel directory.
     */
    private boolean _isUserChannel;
    
    private ArrayList _channelListeners = new ArrayList( 1 );
    
    
    public Channel()
    {
      _open = false;
    }
  
  
    public void setHTTPLastModified( String httpLastModified )
    {
      _httpLastModified = httpLastModified;
    }
    
    public String getHTTPLastModified()
    {
      return _httpLastModified;
    }
    
    public void setHTTPEtag( String httpEtag )
    {
      _httpEtag = httpEtag;
    }
    
    public String getHTTPEtag()
    {
      return _httpEtag;
    }
    
    public boolean isUserChannel()
    {
      return _isUserChannel;
    }
    
    public void setUserChannel( boolean isUserChannel )
    {
      _isUserChannel = isUserChannel;
    }
    
    public boolean equals( Object that )
    {
      if ( that instanceof Channel )
      {
        String thatURL = ((Channel)that).getURL();
        if ( thatURL  != null && this._url != null)
        {
          return this._url.equals( thatURL );
        }
        else
        {
          return this._url == null && thatURL == null;
        }
      }
      
      return false;
    }
    
    public int hashCode()
    {
      if ( _url != null )
      {
        return _url.hashCode();
      }
      return super.hashCode();
    }
   
   public void addChannelListener( ChannelListener cl )
   {
     _channelListeners.add( cl );
   }
   
   public void removeChannelListener( ChannelListener cl )
   {
     _channelListeners.remove( cl );
   }
   
   public void fireItemChanged( Item item )
   {
     final int index = _items.indexOf( item );
     if ( index >= 0 )
     {
       fireItemChanged( index );
     }
   }
   
   
   public void fireItemChanged( final int index )
   {
     // Events should be fired on the event thread
     SwingUtilities.invokeLater( new Runnable() { 
       public void run() 
       {
         // Always dup listener list for safety
         int count = _channelListeners.size();
         if ( count > 0 )
         {
           ChannelListener[] copy = new ChannelListener[ count ];
           _channelListeners.toArray( copy );
           
           ChannelEvent event = new ChannelEvent( Channel.this, index );
           
           for ( int i=0; i < count; i++ )
           {
             copy[ i ].itemsChanged( event );
           }
         }
         
       }
     });
   }
   
   public void fireItemsChanged( Collection items )
   {
     // Could be more efficient
     for ( Iterator i=items.iterator(); i.hasNext(); )
     {
       Item item = (Item) i.next();
       fireItemChanged( item );
     }
   }
   
   
   public void fireItemsChanged( )
   {
     // Events should be fired on the event thread
     SwingUtilities.invokeLater( new Runnable() { 
       public void run() 
       {
         // Always dup listener list for safety
         int count = _channelListeners.size();
         if ( count > 0 )
         {
           ChannelListener[] copy = new ChannelListener[ count ];
           _channelListeners.toArray( copy );
           
           ChannelEvent event = new ChannelEvent( Channel.this );
           
           for ( int i=0; i < count; i++ )
           {
             copy[ i ].itemsChanged( event );
           }
         }
         
       }
     });
   }
 
 
   public void setTitle( String title )
   {
     _title = title;
   }
 
 
   public String getTitle()
   {
     return _title;
   }
 
 
   public void setLink( String link )
   {
     _link = link;
   }
 
 
   public String getLink()
   {
     return _link;
   }
   
 
   public void setDescription( String description )
   {
     _description = description;
   }
   
 
   public String getDescription()
   {
     return _description;
   }
 
 
   public void setItems( List items )
   {
     _items = items;
   }
   
   
   public List getItems()
   {
     return _items;
   }
   
   
   public int getUnreadItemCount()
   {
     if ( _items == null )
     {
       return 0;
     }
     
     int unreadCount = 0;
     Iterator iter = _items.iterator();
     while( iter.hasNext() )
     {
       Item item = ( Item ) iter.next();
       if ( !item.isRead() )
       {
         unreadCount ++;
       }
     }
     return unreadCount;
   }
 
 
   public void addItem( Item item, boolean overwrite )
   {
     if ( _items == null )
     {
       _items = new ArrayList( 10 );
     }
     if ( overwrite )
     {
       if ( _items.contains( item ) )
       {
         _items.remove( item );
       }
       _items.add( item );
     }
     else
     {
       if ( !_items.contains( item ) )
       {
         _items.add( item );
       }
     }
   }
   
   
   public void addAllItems( Channel fromChannel )
   {
     Iterator iter = fromChannel.getItems().iterator();
     while( iter.hasNext() )
     {
       addItem( ( Item ) iter.next(), true );
     }
   }
 
 
   public String dumpString()
   {
     StringBuffer b = new StringBuffer(1000);
     b.append( "[Channel] {Title: " + _title + "} {Link: " + _link + "} {Description: " + _description + "}\n" );
     Iterator i = ( _items != null ) ? _items.iterator() : Collections.EMPTY_LIST.iterator();
     while ( i.hasNext() )
     {
       Item item = ( Item ) i.next();
       b.append( "  " );
       b.append( item.dumpString() );
     }
     return b.toString();
   }
   
 
   public String toString()
   {
     if ( _title == null || _title.length() == 0 )
     {
       if ( _description == null || _description.length() == 0 )
       {
         return getURL();
       }
       return _description.substring( 0, 60 );
     }
     return _title;
   }
 
 
   public void setOpen( boolean open )
   {
     _open = open;
   }
 
   public boolean isOpen()
   {
     return _open;
   }
   
   
   public void setURL( String url )
   {
     _url = url;
   }
   
   
   public String getURL()
   {
     return _url;
   }
   
   
 }