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JTree -> SQL query

Posted on 2004-09-29
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Last Modified: 2006-11-17
Hello,
I have a JTree which represents an SQL where clause:
eg,
AND
   var > 10
   var2 = text
   OR
       var3 > 2
       var4 < 2
etc.

I'm going to stick this tree in a JSplitPane and then Im going to make a dynamic parser as the right component - just the representative SQL statement
eg,
WHERE
{
    var > 10  AND
    var2 = text AND
or whatever!!

I want to know what would be the best JComponent to use to display this SQL statement??
eg, it would be easy to generate XML from the tree and this XML could allow me to specify, font color, bold,  indents (for groups AND, OR) etc.

What do you think??
Thanks
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Question by:cathalmchale
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Expert Comment

by:zzynx
ID: 12180537
>> it would be easy to generate XML from the tree and this XML could allow me to specify, font color, bold,  indents (for groups AND, OR) etc.
JTextArea I suppose
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Expert Comment

by:zzynx
ID: 12180563
Sorry, I meant JTextPane, since it allows the use of StyledDocument
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Author Comment

by:cathalmchale
ID: 12180652
Ok, would you have any simple examples with similar functionality you could point me towards please?
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Expert Comment

by:zzynx
ID: 12180744
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Author Comment

by:cathalmchale
ID: 12180935
thanks.
i have the following XML generated for other reasons, i want to reuse this:

- <filter-definition>
-    <filter-group logic="AND">
        <filter field="Address" operator="=" value="2" />
        <filter field="customer_name" operator="=" value="john" />
-       <filter-group logic="OR">
           <filter field="EleInPort" operator="=" value="22" />
        </filter-group>
     </filter-group>
  </filter-definition>

I presume this is OK - I can do something like:
if its a <filter-group>
    set text color, style etc
    print string
else
...
And keeping track of indents??  should all be ok i think
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Author Comment

by:cathalmchale
ID: 12180979
>>And keeping track of indents??  should all be ok i think
 the tab-stops at this link I guess!!

cheers
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Expert Comment

by:zzynx
ID: 12180984
>>should all be ok i think
Don't have any experience with it, but I think it, yeah.
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Expert Comment

by:zzynx
ID: 12181012
>> the tab-stops at this link I guess!!
???
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Author Comment

by:cathalmchale
ID: 12188310
Hi again,

im using
StyledDocument sqlDoc = new DefaultStyledDocument();
and I have some Styles set up, so I can use
sqlDoc.insertString(sqlDoc.getLength(), "Some text", style);

but how do I specify the tab position at where I want this text inserted - this position is relative to the recursion number -> each time I recurse ill add 10 to this tab position for example.
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Expert Comment

by:zzynx
ID: 12188379
Just an idea: can't you use "\t" ?
sqlDoc.insertString(sqlDoc.getLength(), "\tSome text", style);


StringBuffer tabs = new StringBuffer("\t");
In your loop: tabs.append("\t");
sqlDoc.insertString(sqlDoc.getLength(), tabs.toString()+"Some text", style);
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Author Comment

by:cathalmchale
ID: 12188389
Also, it seems that you must associate a Style with a document - and initialise everything at the beginning.
I had imagined that each time I wanted to redraw the JTextPane I would do:

StyledDocument sqlDoc = new DefaultStyledDocument();
// could use some Styles initialised as fields in the class
sqlDoc.insertString(sqlDoc.getLength(), "Some text", style);

//then finally to update evrything
jTextPane.setDocument(sqlDocument);

but I can't do this because of the StyledDocument interface - so what do I do, just set-up everything (new doc, add new styles etc.) each time???
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Author Comment

by:cathalmchale
ID: 12188407
>> Just an idea: can't you use "\t" ?

i guess I could try this, but the "tab-stops" idea which was in the link you posted me, perhaps seems like a better idea??  but I am not sure how to dynamically implement this like your dynamic  >>In your loop (RECURSION): tabs.append("\t");
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Expert Comment

by:zzynx
ID: 12188810
>> so what do I do, just set-up everything
No. You can

    // 1) Start with the current input attributes for the JTextPane:
    MutableAttributeSet attrs = jTextPane.getInputAttributes();
    // 2) Change some attributes

    // 3) Retrieve the pane's document object
    StyledDocument doc = jtp.getStyledDocument();
   
    // 4) Apply the new attributes
    doc.setCharacterAttributes(...)

Have a look at the last example at http://javatechniques.com/public/java/docs/basics/jtextpane-font.html

Also interesting: http://javaalmanac.com/egs/javax.swing.text/style_HiliteWords2.html
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Author Comment

by:cathalmchale
ID: 12189902
OK thanks, I have it working beautifully now with 1 small exception !! :)

the "\t" tab is too big, how do i set it to a smaller size??
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Accepted Solution

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zzynx earned 250 total points
ID: 12190013
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Author Comment

by:cathalmchale
ID: 12190577
thanks all working well now,
what a lot of hassle ;-)

Cathal,
P.S. shud i post my solution - it may be of help to others, but the code is quite long
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LVL 37

Expert Comment

by:zzynx
ID: 12190661
Thanks for accepting

>> thanks all working well now,
Nice!
>> what a lot of hassle ;-)
:)

>>P.S. shud i post my solution - it may be of help to others, but the code is quite long
You decide

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