// 查詢通話記錄的圖形用戶界面
package Telephone;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class QueryPanel extends JPanel implements ActionListener {
    // 屬性
    protected JApplet applet;					// 當前正在運行的Applet
    protected JTextField subscriberTextField;	// 輸入用戶名字的字段
    protected JPanel tablePanel;				// 顯示二維表的面板

    // 構造方法，顯示圖形用戶界面
    public QueryPanel(JApplet applet) {
        this.applet = applet;
        setLayout(new BorderLayout());
        setBorder(BorderFactory.createEmptyBorder(12, 12, 12, 12));
        // 查詢條件面板
        JPanel conditionPanel = new JPanel(new BorderLayout());
        conditionPanel.setBorder(BorderFactory.createEtchedBorder());
        add("North", conditionPanel);
          // 顧客姓名面板
          JPanel subscriberPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
          conditionPanel.add("Center", subscriberPanel);
            // 顧客姓名的標簽
            JLabel subscriberLabel = new JLabel("電話用戶名");
            subscriberPanel.add(subscriberLabel);
            // 顧客姓名的文本域
            subscriberTextField = new JTextField();
            subscriberTextField.setPreferredSize(new Dimension(160, 18));
            subscriberPanel.add(subscriberTextField);
          // 按鈕面板
          JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
          conditionPanel.add("East", buttonPanel);
            // 查詢按鈕
            JButton queryButton = new JButton("查詢");
            queryButton.setActionCommand("QUERY");
            queryButton.addActionListener(this);
            buttonPanel.add(queryButton);
            // 重置按鈕
            JButton resetButton = new JButton("清除");
            resetButton.setActionCommand("RESET");
            resetButton.addActionListener(this);
            buttonPanel.add(resetButton);
        // 以帶標簽窗格顯示查詢結果
        JTabbedPane resultTabbedPane = new JTabbedPane();
        add(resultTabbedPane);
          // 查詢頁面
          tablePanel = new JPanel(new BorderLayout());
          resultTabbedPane.addTab("查詢結果", null, tablePanel, "");
        // 顯示上述GUI控件
        validate();
        setVisible(true);
    }
    // 實現ActionListener規定的事件處理程序，對發生的事件evt進行處理
    public void actionPerformed(ActionEvent evt) {
        String cmd = evt.getActionCommand();
        if (cmd.equals("QUERY")) {    // 處理"查詢"按鈕
            String subscriber = subscriberTextField.getText();
            if (subscriber.equals(""))  return;
            // 調用遠程對象的方法進行查詢
            Database.DatabaseTableModel result = null;
            try {
                // 從Applet提取主機名
                String host = "//" + applet.getCodeBase().getHost() + "/";
                // 遠程對象的標識必須與服務程序注冊時使用的對象標識完全相同
                String objectId = "CallManager";
                // 根據主機名與對象標識解析遠程對象
                CallManagerInterface manager = (CallManagerInterface) 
                    java.rmi.Naming.lookup(host + objectId);
                // 調用遠程對象方法查詢用戶的通話記錄
                result = manager.getCallHistory(subscriber);
            } catch(Exception exc) {
                exc.printStackTrace();
            }
            // 將查詢結果顯示為二維表
            tablePanel.removeAll();
            tablePanel.add(new JScrollPane(new JTable(result)));
            tablePanel.validate();
        } else if (cmd.equals("RESET")) {    // 處理"清除"按鈕
            subscriberTextField.setText("");
            subscriberTextField.requestFocus();
        }
    }
}