/*
Application運行入口
java RssParser

classname RssParser

名稱：RSS解析器
Version 1.0

Date 2006-06-03
Down www.codefans.net

CopyRight
清華大學數學科學系
數32班
王元濤
2003012142
*/
import java.awt.event.*;
import java.awt.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
import java.net.URL;
import java.net.MalformedURLException;
import java.net.URLConnection;
import java.util.*;
import javax.swing.table.*;
import org.w3c.dom.*;
import org.apache.crimson.tree.XmlDocument;
import java.io.*; 
import javax.xml.parsers.*;
import javax.swing.plaf.multi.MultiTreeUI;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////表現層
public class RssParser extends Applet{//主類
	//全局對象
	static RssParser rssParser;
	static Frame frame;
	static PanelTree pTree;
	static PanelTable pTable;
	static Label status;
	
	//初始化布局
	public void init(){
		setLayout(new BorderLayout());
		pTable = new PanelTable();
		pTree = new PanelTree(pTable);
		status = new Label("Status:");
		add("West", pTree);
		add("Center",pTable);
		add("South",status);
		status.setText("inited");
	}
	
	//程序入口
	public static void main(String[] args){
		frame = new Frame("RssParser");
		rssParser = new RssParser();
		rssParser.init();
		
		frame.addWindowListener(new WindowAdapter()//匿名內部類
		{
			public void windowClosing(WindowEvent e) {//關閉窗口
				System.exit(0);
			}
		}
		);

		frame.add("Center", rssParser);
		frame.setSize(1024, 700);
		frame.show();
	}
}

class PanelTree extends Panel implements MouseListener{//左側的樹

	//全局變量
	public JTree tree;
	public MenuActions popp;
	public RSSNode top;
	PanelTable targetTable;
	
	//構造方法初始化布局
	public PanelTree(PanelTable targetTable){
		this.targetTable=targetTable;
		//添加菜單對象
		popp=new MenuActions(this.tree);
		add(popp);
		//添加樹
		JScrollPane jsp=creatTree();
	//	jsp.setBounds(new Rectangle(0,0,300,650));
		add(jsp);
	}
	
	//創建樹
	public JScrollPane creatTree(){
		//根節點為RSSNode的對象
		top = new RSSNode("MyRSS_root");
		top.type=0;
		try{
			//根據頻道定義文件創建樹內容
			XmlProcessor.opmlRead(top,"opml.xml");
		}catch(Exception e){
			RssParser.status.setText(e.getMessage());
		}
		tree = new JTree(top);
		//監聽鼠標在樹上的動作
		tree.addMouseListener(this);

		//返回帶自動滾動條的樹
		return new JScrollPane(tree,
		ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
		ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
	}
	public void mouseClicked(MouseEvent e){
			TreePath selPath = tree.getPathForLocation(e.getX(),e.getY());
				if(selPath!=null){
					//返回點中的對象
					Object o=selPath.getLastPathComponent();
					//如果是左鍵點擊
					if(e.getButton()==e.BUTTON1){
						//狀態欄輸出RSS的URL
						if(((RSSNode)o).url!=null)
							RssParser.status.setText(((RSSNode)o).url.toString());
						else{
							RssParser.status.setText("feed://about:_root");
						}
					}
					//如果是右鍵
					if(e.getButton()==e.BUTTON3){
						//彈出菜單
						popp.curNode=(RSSNode)o;
						popp.add(popp.popupMenu1);
						popp.popupMenu1.removeAll();
						//添加菜單項
						if(popp.curNode.type==0){
							popp.popupMenu1.add(popp.menuItem1);
							popp.popupMenu1.add(popp.menuItem4);
						}else{
							popp.popupMenu1.add(popp.menuItem2);
							popp.popupMenu1.add(popp.menuItem3);
						}
						//菜單位置與事件發生位置偏差修正，真正顯示
						popp.popupMenu1.show(popp,e.getX(),e.getY()-200);
						//重繪
						popp.repaint();
					}
				}
	}	
	public void mouseReleased(MouseEvent e){}
	public void mouseEntered(MouseEvent e){}
	public void mouseExited(MouseEvent e){}
	public void mousePressed(MouseEvent e){}
}

class PanelTable extends Panel{//右側的表

	//全局變量
	public JTable table;
	public Vector row;
	public DefaultTableModel tableModel;
	String[] tableHeads = {"標題","時間","摘要","來源"};
	
	//構造表
	public PanelTable(){
		tableModel = new DefaultTableModel();
		Vector tableHeadName = new Vector();
		//寫表頭
		for (int i = 0; i < tableHeads.length; i++) {
			tableHeadName.add(tableHeads[i]);
		}
		tableModel.setDataVector(new Vector(),tableHeadName);
		//創建表
		table = new JTable(tableModel);
		//設置表外觀
		table.setAutoResizeMode(JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS);
		table.setPreferredScrollableViewportSize(new Dimension(700,600));
		table.getColumnModel().getColumn(0).setPreferredWidth(200);
		table.getColumnModel().getColumn(1).setPreferredWidth(120);
		table.setSurrendersFocusOnKeystroke(false);
	//	table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
		table.setRowHeight(20);
		//為表加入滾動條
		JScrollPane jsp2=new JScrollPane(table,
		ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
		ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
		add(jsp2);
	}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////交互層

class MenuActions extends JPanel implements ActionListener{//菜單

	//全局變量
	public String title;
	public RSSNode curNode;//關鍵變量
	JTree tree;
	public PopupMenu popupMenu1 = new PopupMenu();
	public MenuItem menuItem1 = new MenuItem();
	public MenuItem menuItem2 = new MenuItem();
	public MenuItem menuItem3 = new MenuItem();
	public MenuItem menuItem4 = new MenuItem();

	//構造菜單和菜單項
	public MenuActions(JTree tree) {
		this.tree=tree;
		this.setLayout(null);

		menuItem1.setLabel("添加RSS");
		menuItem2.setLabel("刪除RSS");
		menuItem3.setLabel("顯示RSS");
		menuItem4.setLabel("顯示全部RSS");
		menuItem1.addActionListener(this);
		menuItem2.addActionListener(this);
		menuItem3.addActionListener(this);
		menuItem4.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand().equals("添加RSS"))addRss(e);
		if(e.getActionCommand().equals("刪除RSS"))delRss(e);
		if(e.getActionCommand().equals("顯示RSS"))showRss(e);
		if(e.getActionCommand().equals("顯示全部RSS"))showAll(e);
	}


	void addRss(ActionEvent e){//添加RSS
		//清空表
		RssParser.pTable.tableModel.setRowCount(0);
		//彈出對話框，要求輸入RSS的URL，程序自動獲取其名稱
		String url=JOptionPane.showInputDialog("Please input RSS Url:(and then the name will be given)");
		if(url!=null){
			String name="New rssSite";
			RSSNode tmp=new RSSNode(name);
			try{
				//字符串到URL對象的轉換
				tmp.url=new URL(url);
				//設置為臨時類型
				tmp.type=2;
				curNode.add(tmp);
				//加入后自動更新
				XmlProcessor.rssRead(tmp,tree);
			}
			catch(MalformedURLException ex){
				RssParser.status.setText(ex.getMessage());
			}catch(Exception ex2){
				RssParser.status.setText(ex2.getMessage());
			}
		}
	}

	void delRss(ActionEvent e){//刪除RSS
		RssParser.pTable.tableModel.setRowCount(0);
		int i=JOptionPane.NO_OPTION;
		try{//確認刪除
			i=JOptionPane.showConfirmDialog(RssParser.frame,
			"Are you sure to delete "+curNode.name+"?",
			"Confirmer",
			JOptionPane.YES_NO_OPTION);
		}catch(Exception ex){}
		if(i==JOptionPane.YES_OPTION){