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/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// VSX2.java
//VSX2: A <b>Reasonably</b> Simple XML utility class.
//Currently this class has two main methods: parse() and write().
//Both work with the TreeModel class and are meant to help you
//view XML documents with JTree. This version will embed icons
//and tool tip text in nodes if <code>icon</code> or
//<code>tiptext</code> attributes are found in the tag.
//
import java.awt.Color;
import java.awt.Component;
import java.io.File;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class VSX2 {
public TreeModel parse(String filename) {
SAXParserFactory factory = SAXParserFactory.newInstance();
XMLIconTreeHandler handler = new XMLIconTreeHandler();
try {
// Parse the input
SAXParser saxParser = factory.newSAXParser();
saxParser.parse(new File(filename), handler);
} catch (Exception e) {
System.err.println("File Read Error: " + e);
e.printStackTrace();
return new DefaultTreeModel(new DefaultMutableTreeNode("error"));
}
return new DefaultTreeModel(handler.getRoot());
}
public static class XMLIconTreeHandler extends DefaultHandler {
private DefaultMutableTreeNode root, currentNode;
public DefaultMutableTreeNode getRoot() {
return root;
}
// SAX Parser Handler methods...
public void startElement(String namespaceURI, String lName, // local
// name
String qName, // qualified name
Attributes attrs) throws SAXException {
String eName = lName; // element name
if ("".equals(eName))
eName = qName;
ITag t = new ITag(eName, attrs);
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(t);
if (currentNode == null) {
root = newNode;
} else {
// must not be the root node...
currentNode.add(newNode);
}
currentNode = newNode;
}
public void endElement(String namespaceURI, String sName, // simple name
String qName // qualified name
) throws SAXException {
currentNode = (DefaultMutableTreeNode) currentNode.getParent();
}
public void characters(char buf[], int offset, int len)
throws SAXException {
String s = new String(buf, offset, len).trim();
((ITag) currentNode.getUserObject()).addData(s);
}
}
public static class ITag implements IconAndTipCarrier {
private String name;
private String data;
private Attributes attr;
private Icon icon;
private String tipText;
public ITag(String n, Attributes a) {
name = n;
attr = a;
for (int i = 0; i < attr.getLength(); i++) {
String aname = attr.getQName(i);
String value = attr.getValue(i);
if (aname.equals("icon")) {
tipText = value;
icon = new ImageIcon(value);
break;
}
}
}
public String getName() {
return name;
}
public Attributes getAttributes() {
return attr;
}
public void setData(String d) {
data = d;
}
public String getData() {
return data;
}
public String getToolTipText() {
return tipText;
}
public Icon getIcon() {
return icon;
}
public void addData(String d) {
if (data == null) {
setData(d);
} else {
data += d;
}
}
public String getAttributesAsString() {
StringBuffer buf = new StringBuffer(256);
for (int i = 0; i < attr.getLength(); i++) {
buf.append(attr.getQName(i));
buf.append("=\"");
buf.append(attr.getValue(i));
buf.append("\"");
}
return buf.toString();
}
public String toString() {
String a = getAttributesAsString();
return name + ": " + a + (data == null ? "" : " (" + data + ")");
}
}
public static void main(String args[]) {
if (args.length != 1) {
System.err.println("Usage is: java VSX2 testfile.xml");
System.exit(1);
}
JFrame frame = new JFrame("Tree Renderer Test");
VSX2 parser = new VSX2();
JTree tree = new JTree(parser.parse(args[0]));
// Steal the default icons from the default renderer...
DefaultTreeCellRenderer rend1 = new DefaultTreeCellRenderer();
IconAndTipRenderer rend2 = new IconAndTipRenderer(rend1.getOpenIcon(),
rend1.getClosedIcon(), rend1.getLeafIcon());
tree.setCellRenderer(rend2);
ToolTipManager.sharedInstance().registerComponent(tree);
frame.getContentPane().add(new JScrollPane(tree));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 400);
frame.setVisible(true);
}
}
//IconAndTipCarrier.java
//A simple interface that can be used with IconAndTipRenderer
//tree cell renderer.
interface IconAndTipCarrier {
public Icon getIcon();
public String getToolTipText();
}
//IconAndTipRenderer.java
//A renderer for our tree cells that have icons and tooltips.
//
class IconAndTipRenderer extends JLabel implements TreeCellRenderer {
Color backColor = new Color(0xFF, 0xCC, 0xFF);
Icon openIcon, closedIcon, leafIcon;
String tipText = "";
public IconAndTipRenderer(Icon open, Icon closed, Icon leaf) {
openIcon = open;
closedIcon = closed;
leafIcon = leaf;
setBackground(backColor);
setForeground(Color.black);
}
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
setText(value.toString());
if (selected) {
setOpaque(true);
} else {
setOpaque(false);
}
// Try to find an IconAndTipCarrier version of the current node.
IconAndTipCarrier itc = null;
if (value instanceof DefaultMutableTreeNode) {
Object uo = ((DefaultMutableTreeNode) value).getUserObject();
if (uo instanceof IconAndTipCarrier) {
itc = (IconAndTipCarrier) uo;
}
} else if (value instanceof IconAndTipCarrier) {
itc = (IconAndTipCarrier) value;
}
if ((itc != null) && (itc.getIcon() != null)) {
// Great! Use itc's values to customize this label
setIcon(itc.getIcon());
tipText = itc.getToolTipText();
} else {
// Hmmm, nothing available, so rely on the defaults.
tipText = " ";
if (expanded) {
setIcon(openIcon);
} else if (leaf) {
setIcon(leafIcon);
} else {
setIcon(closedIcon);
}
}
return this;
}
// Override the default to send back different strings for folders and
// leaves.
public String getToolTipText() {
return tipText;
}
}
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