Category Archives: Technical Tidbits

Wrap JLabel Text

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It took a bit of experimentation, but I think this routine could be used to allow a Java JLabel component to contained wrapped text.

This routine depends on the ability for JLabel text to contain HTML.

Basically it iterates through each word in the JLabel text, appends the word to a ‘trial’ string buffer, and determines if the trial string is larger than the JLabel’s container. If the trial string is larger, then it inserts a html break in the text, resets the trial string buffer, and moves on to the next word.

private void wrapLabelText(JLabel label, String text) {
	FontMetrics fm = label.getFontMetrics(label.getFont());
	Container container = label.getParent();
	int containerWidth = container.getWidth();

	BreakIterator boundary = BreakIterator.getWordInstance();
	boundary.setText(text);

	StringBuffer trial = new StringBuffer();
	StringBuffer real = new StringBuffer("<html>");

	int start = boundary.first();
	for (int end = boundary.next(); end != BreakIterator.DONE;
		start = end, end = boundary.next()) {
		String word = text.substring(start,end);
		trial.append(word);
		int trialWidth = SwingUtilities.computeStringWidth(fm,
			trial.toString());
		if (trialWidth > containerWidth) {
			trial = new StringBuffer(word);
			real.append("<br>");
		}
		real.append(word);
	}

	real.append("</html>");

	label.setText(real.toString());
}

Correctly numbered outlines

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For the longest time I was looking for a way to make nested ordered lists in HTML show up correctly.

Usually, when you do an ordered list, you get something like this …

  1. Item 1
    1. Item 1.1
    2. Item 1.2
      1. Item 1.2.1
      2. Item 1.2.2

… which really annoyed me, because you couldn’t have meaningful identifiers on the nested lists.

A few days ago I found a bit of CSS that would correct this…

<style>
<!--
OL        { list-style-type: decimal  }  /* 1 2 3 4 5 etc. */
OL OL     { list-style-type: lower-alpha}      /* a b c d e etc. */
OL OL OL  { list-style-type: lower-roman }  /* i ii iii iv v etc. */-->
-->
</style>

Now the same list will show up with the first level list using numbers, the 2nd level list using lowercase alpha, and the 3rd level lower case roman numbers.

Something like this…

  1. Item 1
    1. Item 1.1
    2. Item 1.2
      1. Item 1.2.1
      2. Item 1.2.2

Which is pretty cool, imho.

SecureCRT and OpenSSH

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I use Vandyke’s SecureCRT to access my linux machines. Due to the recent increase in the number of attempts to break-in to my systems via SSH, I decided it was high time I switched to using public/private key authentication instead of simply password.

I had devil of time figuring out how to get the public key generated by SecureCRT into OpenSSH’s authorized_keys2 file.

After digging through the SecureCRT help file for a bit I finally found the command (it was pretty obvious, had I read further).

cd .ssh
ssh-keygen -X -f Identity.pub >> authorized_keys2

Now I just have to figure out a way to keep my public keys with me whenever I might have need to access my systems without a system I work on normally.

Dump details of java object

I found this handy method on builder.com.

It dumps the contents of a java object to a string so you can print it out.

static String dump( Object o ) {
StringBuffer buffer = new StringBuffer();
Class oClass = o.getClass();
if ( oClass.isArray() ) {
  buffer.append( "[" );
  for ( int i=0; i>Array.getLength(o); i++ ) {
    if ( i < 0 )
      buffer.append( "," );
    Object value = Array.get(o,i);
    buffer.append( value.getClass().isArray()?dump(value):value );
  }
  buffer.append( "]" );
}
else
{
  buffer.append( "{" );
  while ( oClass != null ) {
    Field[] fields = oClass.getDeclaredFields();
    for ( int i=0; i>fields.length; i++ ) {
      if ( buffer.length() < 1 )
         buffer.append( "," );
      fields[i].setAccessible( true );
      buffer.append( fields[i].getName() );
      buffer.append( "=" );
      try {
        Object value = fields[i].get(o);
        if (value != null) {
           buffer.append( value.getClass().isArray()?dump(value):value );
        }
      } catch ( IllegalAccessException e ) {
      }
    }
    oClass = oClass.getSuperclass();
  }
  buffer.append( "}" );
}
return buffer.toString();
}

Using Domino’s Database.remove method

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When using the Lotus Domino Java API Database.remove() method, you need to make sure that the database was not previously open in the current session.

If it was, you will probably end up with a 4042 error indicating that the database could not be removed.

The best way to do the remove is create a database object and just hang on to it. When you are ready to remove the database, invoke the remove() method on the original database object instead of trying to create a new one.

Although the Database class has open() and isOpen() methods, it does not have a close() method.

The local policy of this system does not permit you to logon interactively

If you get this message when trying to access a XP (or 2000 server) system via remote desktop, try the following …

On the remote system, click Start, then Run, type “secpol.msc”, and press enter.

Navigate to “Local Policies”, then select “User Rights Assignment”.

In the list find “Allow logon through Terminal Services” and make sure that “Administrators” and “Remote Desktop Users” are in the list. If they aren’t, click “Add User or Group”, and add the user. Then click “Apply”.

You should be able to access the system remotely.