simparamiprtable.java

一个小型网络仿真器的实现

    private boolean checkRunning() {
      if(getOwner().getSim().isRunning()) {
        JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Simulation is running!",
          "Command not allowed",JOptionPane.WARNING_MESSAGE);
        return false;
      }
      return true;
    }

    public void actionPerformed(ActionEvent e) {
      String command=e.getActionCommand();

      if(command.equals("Add")) {
        if(!checkRunning()) return;

      //handle IP
        if(!ipOK()) {
          JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Not a valid IP address!","Error",
            JOptionPane.INFORMATION_MESSAGE);
          txtIP.requestFocus();
          return;
        }
        if(!maskOK()) {
          JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Not a valid net mask!","Error",
            JOptionPane.INFORMATION_MESSAGE);
          txtMask.requestFocus();
          return;
        }
        if(!nextIPOK()) {
          JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Not a valid next hop IP address!","Error",
            JOptionPane.INFORMATION_MESSAGE);
          txtNextIP.requestFocus();
          return;
        }

      //ok, now add it
        int insertpoint=addNewEntry(newIP,newMask,newNextIP,
                            (SimComponent)neighbors.get(comps.getSelectedIndex()),
                            "Static");
        table.setRowSelectionInterval(insertpoint,insertpoint);
      }
      else if(command.equals("Update")) {
        if(!checkRunning()) return;

        int [] sels=table.getSelectedRows();
        if(sels.length!=1) return; //update target not properly selected

      //handle IP
        if(!ipOK()) {
          JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Not a valid IP address!","Error",
            JOptionPane.INFORMATION_MESSAGE);
          txtIP.requestFocus();
          return;
        }
        if(!maskOK()) {
          JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Not a valid net mask!","Error",
            JOptionPane.INFORMATION_MESSAGE);
          txtMask.requestFocus();
          return;
        }
        if(!nextIPOK()) {
          JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Not a valid next hop IP address!","Error",
            JOptionPane.INFORMATION_MESSAGE);
          txtNextIP.requestFocus();
          return;
        }

      //remove old entry, and add new one
        rtable.remove(sels[0]);
        int insertpoint=addNewEntry(newIP,newMask,newNextIP,
                            (SimComponent)neighbors.get(comps.getSelectedIndex()),
                            "Static");
        table.setRowSelectionInterval(insertpoint,insertpoint);
      }
      else if(command.equals("Remove")) {
        if(!checkRunning()) return;

        int [] sels=table.getSelectedRows();
        java.util.List selcomps=new java.util.ArrayList();
        for(int i=0;i<sels.length;i++)
          selcomps.add(rtable.get(sels[i]));
        rtable.removeAll(selcomps);
        table.getSelectionModel().clearSelection();
        table.revalidate();
        rtableDialog.repaint();
      }
      else if(command.equals("Close")) {
        rtableDialog.dispose();
      }
    }
  }

//helper for generating the combobox contents
// and fill in the neighbor list
  private String [] getOutLinks(java.util.List outlinks) {
    int i;
    for(i=0;i<getOwner().neighborCount();i++) {
      if(getOwner().neighbor(i).getCompClass().equals("Link"))
        outlinks.add(getOwner().neighbor(i));
    }
    String [] names=new String[outlinks.size()];
    for(i=0;i<names.length;i++) {
      names[i]=((SimComponent)outlinks.get(i)).getName();
    }
    return names;
  }

//helper for monitoring changes in the simulation (e.g. to refresh table)
  private void checkLinks() {
    int i;

    //check if there are still neighbors...
    if(getOwner().neighborCount()==0) {
      //remove all entries
      rtable.clear();
      if(rtableDialog!=null) rtableDialog.dispose();
      return;
    }

    //check for removal of neighbors...
    java.util.Iterator it=rtable.iterator();
    while(it.hasNext()) {
      IPRouteEntry r=(IPRouteEntry)it.next();
      for(i=0;i<getOwner().neighborCount();i++) {
        if(getOwner().neighbor(i)==r.nexthop) break;
      }
      if(i==getOwner().neighborCount())
        it.remove();
    }

    //refresh dialog box if it's there...
    if(rtableDialog!=null) {
      rtableDialog.getContentPane().removeAll();
      JComponent newpane=createNewRTableDialog();
      rtableDialog.getContentPane().add(newpane);
      newpane.revalidate();
    }
  }

//helper for string ip/mask
  private String getStringIP(int valueip) {
    String ip=String.valueOf((valueip>>24)&0xff)+".";
    ip+=String.valueOf((valueip>>16)&0xff)+".";
    ip+=String.valueOf((valueip>>8)&0xff)+".";
    ip+=String.valueOf(valueip&0xff);
    return ip;
  }

//the table model
  private class MyTableModel extends javax.swing.table.AbstractTableModel {
    public int getRowCount() {
      return rtable.size();
    }
    public int getColumnCount() {
      return 5;
    }
    public Object getValueAt(int row,int col) {
      switch(col) {
        case 0:
          return getStringIP(((IPRouteEntry)rtable.get(row)).ip);
        case 1:
          return getStringIP(((IPRouteEntry)rtable.get(row)).mask);
        case 2:
          int nextip=((IPRouteEntry)rtable.get(row)).nexthopIP;
          if(nextip==0) return new String("Direct");
          else return getStringIP(nextip);
        case 3:
          return ((IPRouteEntry)rtable.get(row)).nexthop.getName();
        case 4:
          return ((IPRouteEntry)rtable.get(row)).type;
      }
      return null;
    }
    public String getColumnName(int col) {
      switch(col) {
        case 0: return "IP";
        case 1: return "Mask";
        case 2: return "Next Hop IP";
        case 3: return "Out Link";
        case 4: return "Type";
      }
      return "N/A";
    }
  }

  private JComponent createNewRTableDialog() {
  //prepare the input panel
    JPanel inputPanel1=new JPanel();
    inputPanel1.add(new JLabel("IP :"));
    JTextField ip=new JTextField(12);
    inputPanel1.add(ip);
    inputPanel1.add(new JLabel("Mask:"));
    JTextField mask=new JTextField(12);
    inputPanel1.add(mask);
    JPanel inputPanel2=new JPanel();
    inputPanel2.add(new JLabel("Next Hop IP:"));
    JTextField nextip=new JTextField(12);
    inputPanel2.add(nextip);
    inputPanel2.add(new JLabel("Out Links:"));
    java.util.List outlinks=new java.util.ArrayList();
    JComboBox comps=new JComboBox(getOutLinks(outlinks));
    comps.setSelectedIndex(0);
    inputPanel2.add(comps);

  //the listener
    DialogListener listener=new DialogListener(ip,mask,nextip,comps,outlinks);

  //prepare the table
    table=new JTable(new MyTableModel());
    JScrollPane scrollPane=new JScrollPane(table);
    table.setPreferredScrollableViewportSize(new Dimension(500,100));
    table.getSelectionModel().addListSelectionListener(listener);

  //prepare buttons panel
    JPanel compPanel=new JPanel();
    JButton btnAdd=new JButton("Add");
    btnAdd.addActionListener(listener);
    compPanel.add(btnAdd);
    JButton btnUpdate=new JButton("Update");
    btnUpdate.addActionListener(listener);
    compPanel.add(btnUpdate);
    JButton btnRemove=new JButton("Remove");
    btnRemove.addActionListener(listener);
    compPanel.add(btnRemove);
    JButton btnClose=new JButton("Close");
    btnClose.addActionListener(listener);
    compPanel.add(btnClose);

  //now the outer panel
    JPanel outerpane=new JPanel();
    GridBagLayout gl=new GridBagLayout();
    outerpane.setLayout(gl);
    GridBagConstraints gc=new GridBagConstraints();
    gc.fill=GridBagConstraints.BOTH;
    gc.gridx=0; gc.gridy=0;
    gl.setConstraints(inputPanel1,gc);
    outerpane.add(inputPanel1);
    gc.gridy=1;
    gl.setConstraints(inputPanel2,gc);
    outerpane.add(inputPanel2);
    gc.gridy=2;
    gl.setConstraints(compPanel,gc);
    outerpane.add(compPanel);
    gc.gridy=3; gc.weightx=1; gc.weighty=1;
    gl.setConstraints(scrollPane,gc);
    outerpane.add(scrollPane);

    return outerpane;
  }

  public void actionPerformed(ActionEvent e) {
    if(rtableDialog==null) {
      rtableDialog=new SimDialog(theGUI.getMainFrame(),getOwner().getName()
                                 +" - "+getName(),getOwner().getSim(),theGUI) {
          public void connectionsChanged() { checkLinks(); }
          public void componentsChanged() { checkLinks(); }
        };

      rtableDialog.getContentPane().add(createNewRTableDialog());
      rtableDialog.addWindowListener(new WindowAdapter() {
          public void windowClosed(WindowEvent e) {
            rtableDialog=null;
          }
        });
      rtableDialog.pack();
      Dimension dsize=rtableDialog.getSize();
      Dimension scrsize=Toolkit.getDefaultToolkit().getScreenSize();
      rtableDialog.setLocation((scrsize.width-dsize.width)/2,(scrsize.height-dsize.height)/2);

      rtableDialog.show();
    }
    else
      rtableDialog.requestFocus();
  }
}