How to modify text insertion position in HTML in a JEditorPane

Hi all,
Thanks in advance if anyone knows the type of code I need to look at to solve my problem.
It involves the insertion point (in the actual HTML) when editing text in a JEditorPane using type html/txt.
for example, lets say you start to add text by typing in a JEditorPane which already contains some text.
The html is:
<html><head></head>
<body>
inside
</body>
</html>
which represents visually:
inside
The user places the caret (by pointing and clicking the mouse) after the word 'inside'.
The user types the word 'outside'.
The resulting html will look like this:
<html><head></head>
<body>
insideoutside
</body>
</html>
I would very much prefer it to look like this:
<html><head></head>
<body>
insideoutside
</body>
</html>
Does anyone know how to influence the position of insertion in this way?
Thanks again,
sean

Success!!!
In a tiny bit of a hacky way.
I will share my path to success. Though I am sure it could be improved. The solution (except for the minor hack to get it to work at all) is quite simple.
And it did indeed involve the use of the DocumentFilter.
So, to recap, My objective was to prevent the user from causing the addition of text within a certain span tag in my HTML when editing visual through a JEditorPane.
Specifically, in my HTML I have a number of span tags identified through a type attribute. My span tags look like this:
hello
I wanted to prevent the user from being able to type (visually) to cause either this:
next text hello
or
hello new text
or
he new text llo
Initially, I had used a Caret listener, and moved the caret along, which, besides being hugely ugly, wouldn't fix the main problem of, even when the user starts typing after the word 'hello' on the visual pane, the text would be appended within the span tag, and not outside. Even though if I were to check my position (with the following code) I would be told it wasn't associated with the span attribute at all
 Element elem = hdoc.getCharacterElement(pos);
 AttributeSet a = elem.getAttributes();
 AttributeSet spanAttributeSet = (AttributeSet)a.getAttribute(HTML.Tag.SPAN);
 // if spanAttributeSet is not null, then we properly found ' a span '.
 // now we need to discover if it is one of OUR spans
 if (spanAttributeSet != null)
 { // blah .... do something
 }Regardless of what it told me with the above code, if i were to type in at that position (just after the hello) it would be added to the span tag. Which is what I didn't want.
But the discovery of the DocumentFilter was what I needed to look at. Although, I had a very strange problem of having to reassign the document filter several times to the editorPane (later checks would see it as null). I don't know why I have this problem, but I have made a work-around by ensuring the DocumentFilter is still assigned by reassigning it every time the user moves the caret in the editorpane. Not nice, but prevents my filter from being ignored.
The real solution:
Using the DocumentFilter, I was able to solve both my problems of , not allowing the user to type inside the word 'hello', and preventing the text typed after the 'hello' being appended inside the span tag by the Document model.
This is my code:
 myFilter = new DocumentFilter(){
 public void insertString(DocumentFilter.FilterBypass fb, int offset, String string, AttributeSet attrs) throws BadLocationException
 System.out.println("in insert string");
 if (isCaretOnReservedObject((HTMLDocument)fb.getDocument(), offset))
 throw new BadLocationException("Reserved position", offset);
 else
 Object val = attrs.getAttribute(HTML.Attribute.TYPE);
 if (val!=null && val.equals("reserved"))
 super.insertString(fb, offset, string, null);
 else
 super.insertString(fb, offset, string, attrs);
 @Override
 public void remove(DocumentFilter.FilterBypass fb,
 int offset,
 int length)
 throws BadLocationException
 super.remove(fb, offset, length);
 public void replace(DocumentFilter.FilterBypass fb,
 int offset,
 int length,
 String text,
 AttributeSet attrs)
 throws BadLocationException
 if (isCaretOnReservedObject((HTMLDocument)fb.getDocument(), offset))
 throw new BadLocationException("Reserved position", offset);
 else
 Object val = attrs.getAttribute(HTML.Attribute.TYPE);
 if (val!=null && val.equals("reserved"))
 super.replace(fb, offset, length, text, null);
 else
 super.replace(fb, offset, length, text, attrs);
 ((AbstractDocument)this.getInternalJEditorPane().getDocument()).setDocumentFilter(myFilter);
 protected boolean isCaretOnReservedObject(HTMLDocument hdoc, int pos)
 boolean retval = false;
 Element elem = hdoc.getCharacterElement(pos);
 AttributeSet a = elem.getAttributes();
 AttributeSet spanAttributeSet = (AttributeSet)a.getAttribute(HTML.Tag.SPAN);
 // if spanAttributeSet is not null, then we properly found ' a span '.
 // now we need to discover if it is one of OUR spans
 if (spanAttributeSet != null)
 Object type = spanAttributeSet.getAttribute(HTML.Attribute.TYPE);
 if (type != null && type.equals("reserved"))
 // for our logging, we get the ref, which holds the source
 // of our value later
 System.out.println(elem + ": the value is: " + spanAttributeSet.getAttribute("ref"));
 retval = true;
 return retval;
 }And now, when I attempt to type on the word 'hello', nothing happens (great!), and when I type after it, it is not assigned the span tag attribute, and we later find it (when outputting html) at the outside of the span tag.
I don't know if there is a better way to do this, but it looks and works fairly cleanly so far.
And thanks to stas for your reply...... Maybe this is what you meant. . it certainly was the attributes I needed to fiddle with here, and it gave me an extra hint of what to look for when researching the problem.
Edited by: svaens on Sep 28, 2009 6:56 PM
forgot to add dependency to code snippet
Edited by: svaens on Sep 28, 2009 9:34 PM
fix bug

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package small.test;
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import java.awt.Container;
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