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Using DefaultMutableTreeNode class

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Melvin

Posts: 6
Nickname: melvin
Registered: Jan, 2003

Using DefaultMutableTreeNode class

Posted: Jan 18, 2003 12:08 AM

Hi,
I am doing a project in which I have to "scan" through a file and retrieved the class names and variable names and put those names into a tree structure.

For example, given a file (data.txt):

(class Man
(attribute Name )
(attribute Address)
) //file ends here

The resultant tree produced will be as followed:

structure
|_ class man
|_ attribute name
|_ attribute address

I am able to form the tree for the above simple example and the codes are as follows:

import java.util.regex.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.io.*;

/* <applet code="RegEx14" width=400 height=300>
</applet>
*/

public class RegEx14 extends JApplet{

JTree tree;
JTextField jtf;
private BufferedReader in;
Matcher l;
String line;
String str2;
String str1;

DefaultMutableTreeNode temp;

public void init() {

Container contentPane = getContentPane();
contentPane.setLayout(new BorderLayout());

Pattern strMatch = Pattern.compile("class[ \\t]+([_$\\w]+)");
Pattern VariableMatch =Pattern.compile("attribute\\s([_$\\w]+)");

try {
in = new BufferedReader(new FileReader("hello.h"));
} catch(FileNotFoundException e){
e.printStackTrace();
}

DefaultMutableTreeNode top = new DefaultMutableTreeNode("structure");
DefaultMutableTreeNode A = new DefaultMutableTreeNode();
DefaultMutableTreeNode B = new DefaultMutableTreeNode();

try{
while((line = in.readLine())!=null) {
l = strMatch.matcher( line );

if(l.find()) {
str1 = l.group();
A.setUserObject(str1);
top.add(A);
}

l = strMatch.matcher( line );
l=VariableMatch.matcher(line);

if(l.find()) {
str2 = l.group();
temp = new DefaultMutableTreeNode (str2);
A.add(temp);
}
}
} catch(IOException e){
e.printStackTrace();
}

tree = new JTree(top);
int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
JScrollPane jsp = new JScrollPane(tree,v,h);
contentPane.add(jsp, BorderLayout.CENTER);
jtf = new JTextField("",20);
contentPane.add(jtf, BorderLayout.SOUTH);

tree.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent me) {
doMouseClicked (me);
}
});
}

void doMouseClicked(MouseEvent me) {
TreePath tp = tree.getPathForLocation(me.getX(), me.getY());

if (tp != null)
jtf.setText(tp.toString());

else
jtf.setText("");
}
}

So my question is how can I alter my codes so that when there are more than one class defnitions in a file, a tree structure similar to the one given below can be built?

File:
(class Man
(attribute Name )
(attribute Address)
)

(class Machine
(attribute ID )
(attribute Parts)
) //File ends here

Resultant tree produced should be :

structure
|_ class Man
| |_ attribute Name
| |_ attribute Address
|
|_ class Machine
|_ attribute ID
|_ attribute Parts

Can somebody please help me. Thank you.

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