Purposes of this assignment:

• To familiarize you with SAX.
• To make sure you are familiar with Swing and Formatter.

General idea of the assignment:

Use a validating SAX parser to read in your XML file from the previous assignment. Display it with the tag and attribute information in one column and the content in another.

<?xml version="1.0"?>
<novel>
  <title>
    In the Dark
  </title>
  <foreword>
    <paragraph>
      This is the great American novel.
    </paragraph>
  </foreword>
  <chapter number="1">
    <paragraph>
      It was a dark and stormy night.
    </paragraph>
    <paragraph>
      Suddenly, a shot rang out!
    </paragraph>
  </chapter>
</novel>

title   
novel
foreword
paragraph   
chapter
  number="1"
paragraph   
paragraph   

In the Dark
 
 
    This is the great American novel.
 
 
    It was a dark and stormy night.
    Suddenly, a shot rang out!

Details:

Use Swing to put a basic GUI on the screen. It need only consist of a button or menu item to click in order to choose a file, and a large scrollable text area in which to display the result. Use a JFileChooser to choose the file to be read. (If you need help with Swing, see my SwingExamples.jar program.)

Use SAX to read in an XML file, and display it as in the example above.

• The start tags should be in a fixed-width column on the left. Make the column wide enough to accomodate your longest tag name and attribute-value pair. (You can count this out yourself; your program doesn't have to decide how wide to make the column.)


• Use java.util.Formatter to create your strings for display. (Hint: Try it out in a simple little test program before using it "for real" in your assignment.)


• Attributes should be indented slightly (2 spaces is good) relative to the tags.


• Content should be further to the right, and should be indented to a depth that depends on its nesting depth in the XML. (For example, "In the Dark" is under both <novel> and <title>, so should be indented less than "This is the great American novel." which is under three things, <novel>, <foreword>, and <paragraph>.


• Don't display any completely blank lines.

If necessary, you may make minor changes to your XML and DTD. For example, if you have any mixed content, eliminate it. If you did not use any attributes, add some.

Due date: