package com.arsitech.xml;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.Properties;
import javax.swing.JEditorPane;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTree;
import javax.swing.WindowConstants;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
/**
* Simple gui to display an xml tree.
*/
public class XMLViewer extends JFrame {
private final String title = "JDOM XML Tree";
private final MenuBar menuBar = new MenuBar();
private final Menu fileMenu = new Menu();
private final MenuItem open = new MenuItem();
private final JFileChooser fileChooser = new JFileChooser();
private final XMLTree xmlTree;
private File file;
public JTree tree;
private Exception exception;
private final int windowHeight = 600;
private final int leftWidth = 380;
private final int rightWidth = 600;
private final int windowWidth = leftWidth + rightWidth;
private final Font treeFont = new Font("Lucida Console", Font.BOLD, 14);
private final Font textFont = new Font("Lucida Console", Font.PLAIN, 13);
/**
* Creates a simple gui for viewing xml in a tree.
*/
public XMLViewer() {
setTitle(getClass().getSimpleName());
setPreferredSize(new Dimension(windowWidth, windowHeight));
setFocusable(true);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
xmlTree = new XMLTree();
fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
fileChooser.setFileFilter(new XMLFileFilter());
fileChooser.setCurrentDirectory(new File("C:/Desktop"));
fileMenu.setLabel("File");
open.setLabel("Browse");
open.addActionListener(new MyActionListener());
makeFrame();
open.dispatchEvent(new ActionEvent(open,1001,open.getActionCommand()));
}
/**
* Construct a frame of the most recently read-in document.
*/
private void makeFrame() {
getContentPane().removeAll();
fileMenu.add(open);
menuBar.add(fileMenu);
setMenuBar(menuBar);
pack();
setVisible(true);
}
/**
* Displays the tree.
*
* @param tree JTree to display
*/
public void display() {
try {
makeFrame();
JScrollPane treeScrollPane = null;
JScrollPane textScrollPane = null;
// Build left-side view
if(tree != null) {
tree.setFont(treeFont);
tree.setEditable(true);
treeScrollPane = new JScrollPane(tree);
treeScrollPane.setPreferredSize(new Dimension(leftWidth, windowHeight));
} else {
JEditorPane errorMessagePane = new JEditorPane();
errorMessagePane.setEditable(false);
errorMessagePane.setContentType("text/plain");
errorMessagePane.setText("Error: unable to build tree from xml:\n"+ exception.toString());
errorMessagePane.setCaretPosition(0);
treeScrollPane = new JScrollPane(errorMessagePane);
}
// Build right-side view
if(file != null) {
StringBuilder sb = new StringBuilder();
//TODO show validation
try {
BufferedReader reader = new BufferedReader(new FileReader(file));
String line = "";
while((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
reader.close();
} catch (Exception e) {
System.err.println("exception when reading file for display");
e.printStackTrace();
}
JEditorPane textPane = new JEditorPane();
textPane.setEditable(false);
textPane.setContentType("text/plain");
textPane.setText(sb.toString());
textPane.setCaretPosition(0);
textPane.setFont(textFont);
textScrollPane = new JScrollPane(textPane);
textScrollPane.setPreferredSize(new Dimension(rightWidth, windowHeight));
}
// Build split-pane view
JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
treeScrollPane, textScrollPane);
splitPane.setContinuousLayout(true);
splitPane.setDividerLocation(leftWidth);
splitPane.setPreferredSize(new Dimension(windowWidth + 10,
windowHeight + 10));
// Add GUI components
setLayout(new BorderLayout());
add("Center", splitPane);
pack();
setVisible(true);
} catch (Exception e) {
System.err.println("error when updating xml viewer");
e.printStackTrace();
}
}
/** listener for when user selects a file to view */
private class MyActionListener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == open) {
int returnVal = fileChooser.showOpenDialog(null);
if (returnVal == JFileChooser.APPROVE_OPTION) {
//reset for currently selected message
exception = null;
file = fileChooser.getSelectedFile();
// update the gui for this file
setTitle(title + " | " + (file != null ? file.getAbsolutePath() : "Select A File"));
// remember last directory used
fileChooser.setCurrentDirectory(file);
try {
xmlTree.parseFile(file);
} catch (Exception e) {
exception = e;
}
tree = xmlTree.getTree();
display();
}
}
}
}
public static void main(String[] argv) {
new XMLViewer();
}
}
