XULRunner with Java: JavaXPCOM Tutorial 3

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// When that button is pressed, then we obtain the HTML document corresponding to
// the URL loaded in browser. Next, we extract all its child nodes with 'a' tag name
// and print its content.
final ToolItem anchorItem = new ToolItem(toolbar, SWT.PUSH);
anchorItem.setImage(getImage("resources/anchors.png"));
anchorItem.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {

// First, we obtain a Mozilla DOM Document representation
nsIDOMDocument doc = browser.getDocument();

// Get all anchors from the loaded HTML document
nsIDOMNodeList nodeList = doc.getElementsByTagName("a");
for ( int i = 0; i < nodeList.getLength(); i++ ){

// Get Mozilla DOM node
nsIDOMNode mozNode = nodeList.item(i);

// Get the appropiate interface
nsIDOMHTMLAnchorElement mozAnchor =
(nsIDOMHTMLAnchorElement) mozNode.queryInterface(
nsIDOMHTMLAnchorElement.NS_IDOMHTMLANCHORELEMENT_IID);

// Get the corresponding W3C DOM node
HTMLAnchorElement a = (HTMLAnchorElement)
HTMLAnchorElementImpl.getDOMInstance(mozAnchor);