[izpack-users] Clearing text when reload custom panel

[Yossi Baram]

Hi guys,
I have created a custom panel that do a validity check for memory space.
I run it right after the TargetPanel.
 
package com.izforge.izpack.panels;
import com.izforge.izpack.gui.ButtonFactory;
import com.izforge.izpack.gui.LabelFactory;
import com.izforge.izpack.installer.InstallData;
import com.izforge.izpack.installer.InstallerFrame;
import com.izforge.izpack.installer.IzPanel;
import com.izforge.izpack.util.VariableSubstitutor;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.*;
import java.io.*;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
 
// This class check available space for installation on Windows and
Linux as well
 
public class ValidityCheck extends IzPanel
{
 private boolean EnoughFreeSpace = true;
 /** The center panel. */
 private JPanel centerPanel;
    /** The variables substitutor. */
    private VariableSubstitutor vs;
    /** The layout. */
    private BoxLayout layout;
     
  public ValidityCheck(InstallerFrame parent, InstallData idata)
  {
    super(parent, idata);
 vs = new VariableSubstitutor(idata.getVariables());
 
 // The 'super' layout
 GridBagLayout superLayout = new GridBagLayout();
 setLayout(superLayout);
 GridBagConstraints gbConstraints = new GridBagConstraints();
 gbConstraints.insets = new Insets(0, 0, 0, 0);
 gbConstraints.fill = GridBagConstraints.NONE;
 gbConstraints.anchor = GridBagConstraints.CENTER;
 
 // We initialize our 'real' layout
 centerPanel = new JPanel();
 layout = new BoxLayout(centerPanel, BoxLayout.Y_AXIS);
 centerPanel.setLayout(layout);
 superLayout.addLayoutComponent(centerPanel, gbConstraints);
 add(centerPanel);
  }
 
  public boolean isValidated()
  {
 
    return( EnoughFreeSpace );
  }
 
  public void panelActivate()
  {
    super.panelActivate();
  
    try{
     long minCapacity=3000; // 1.5 GB
 
centerPanel.add(LabelFactory.create(parent.langpack.getString("ValidityC
heck.head"),
            null, JLabel.TRAILING));
      centerPanel.add(Box.createVerticalStrut(20));
     if(getFreeSpace(idata.getInstallPath().toString())/1000000<
minCapacity){
 
 
centerPanel.add(LabelFactory.create(parent.langpack.getString("ValidityC
heck.fail1"),
            parent.icons.getImageIcon("information"), JLabel.TRAILING));
      centerPanel.add(Box.createVerticalStrut(20));
 
centerPanel.add(LabelFactory.create(parent.langpack.getString("ValidityC
heck.fail2"),
            parent.icons.getImageIcon("information"), JLabel.TRAILING));
      centerPanel.add(Box.createVerticalStrut(20));
      EnoughFreeSpace = false;
  }
  else{
 
 
centerPanel.add(LabelFactory.create(parent.langpack.getString("ValidityC
heck.success"),
            parent.icons.getImageIcon("information"), JLabel.TRAILING));
      centerPanel.add(Box.createVerticalStrut(20));
      EnoughFreeSpace = true;
  }
    
    }
    catch(Exception ex)
 {
  EnoughFreeSpace = false;
 }
 
  }
 public long getFreeSpace(String path) throws Exception
 {
  if (System.getProperty("os.name").startsWith("Windows")) {
  return getFreeSpaceOnWindows(path);
  }
  if (System.getProperty("os.name").startsWith("Linux")) {
  return getFreeSpaceOnLinux(path);
  }
 
  throw new UnsupportedOperationException(
  "The method getFreeSpace(String path) has not been implemented for
this operating system.");
  }
 
 private long getFreeSpaceOnWindows(String path) throws Exception
 {
  long bytesFree = -1;
 
  File script = new File(System.getProperty("java.io.tmpdir"),
  "script.bat");
  PrintWriter writer = new PrintWriter(new FileWriter(script, false));
  writer.println("dir \"" + path + "\"");
  writer.close();
 
  //  get the output from running the .bat file
  Process p = Runtime.getRuntime().exec(script.getAbsolutePath());
  InputStream reader = new BufferedInputStream(p.getInputStream());
  StringBuffer buffer = new StringBuffer();
  for (; ; ) {
   int c = reader.read();
   if (c == -1)
   break;
   buffer.append( (char) c);
  }
  String outputText = buffer.toString();
  reader.close();
 
  //  parse the output text for the bytes free info
  StringTokenizer tokenizer = new StringTokenizer(outputText, "\n");
  while (tokenizer.hasMoreTokens()) {
   String line = tokenizer.nextToken().trim();
   //  see if line contains the bytes free information
   if (line.endsWith("bytes free")) {
   tokenizer = new StringTokenizer(line, " ");
   tokenizer.nextToken();
   tokenizer.nextToken();
   bytesFree = Long.parseLong(tokenizer.nextToken().replaceAll(
   ",", ""));
  }
 }
 return bytesFree;
 }
 
 private long getFreeSpaceOnLinux(String path) throws Exception
 {
  long bytesFree = -1;
 
  Process p = Runtime.getRuntime().exec("df " + "/" + path);
  p.waitFor();
  InputStream reader = new BufferedInputStream(p.getInputStream());
  StringBuffer buffer = new StringBuffer();
  for (; ; ) {
   int c = reader.read();
   if (c == -1)
   break;
   buffer.append( (char) c);
  }
  String outputText = buffer.toString();
  reader.close();
 
  //  parse the output text for the bytes free info
  StringTokenizer tokenizer = new StringTokenizer(outputText, "\n");
  tokenizer.nextToken();
  if(tokenizer.hasMoreTokens())
  {
   String line2 = tokenizer.nextToken();
   StringTokenizer tokenizer2 = new StringTokenizer(line2, " ");
   if(tokenizer2.countTokens()>=4)
   {
    tokenizer2.nextToken();
    tokenizer2.nextToken();
    tokenizer2.nextToken();
    bytesFree = Long.parseLong(tokenizer2.nextToken());
    return bytesFree;
   }
 
  return bytesFree;
  }
  throw new Exception("Can not read the free space of " + path + "
path");
 }
 
}
 
 
It works great.
My problem here is, if the user get a message that he doesnt have enogh
space for installation he should return and set a different target
folder.
When the ValidityCheck panel reload the previous string remains and a
new one is added.
How can I make sure each time you go inside the panel, it has no past
strings that will be added to the new one?
Thanks
Yossi
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