* * This was taken (with small changes) from the Taverna project (see the original * authors below). There it was derived from original code by Kyle * Gabhart from * http://www.devx.com/gethelpon/10MinuteSolution/16694/0/page/1. The * Taverna authors say to it: "...then subsequently heavily rewritten * to move to JDOM, and moved lots of the setup code to the renderer * to cut down initialisation time. Added text node size limit as * well. Displaying large gene sequences as base64 encoded text in a * single node really, really hurts performance.".
* * @author Kyle Gabhart * @author Tom Oinn * @author Kevin Glover * @author Martin Senger * @version $Id: XMLTree.java,v 1.2 2006/02/20 05:51:11 senger Exp $ */ public class XMLTree extends JTree { // private static org.apache.commons.logging.Log log = // org.apache.commons.logging.LogFactory.getLog (XMLTree.class); public static final int MAX_TEXT_SIZE = 1000; int textSizeLimit = MAX_TEXT_SIZE; Element rootElement = null; // shared icons static Icon nodeIcon, leafIcon; /********************************************************************* * Build a new XMLTree from the supplied String containing * XML. The size of text nodes is limited to * {@link #MAX_TEXT_SIZE}. * * @param text to be rendered * @throws MobyException if there is a XML parsing or I/O error ********************************************************************/ public XMLTree (String text) throws MobyException { super(); init (createDocument (text).getRootElement()); revalidate(); } /********************************************************************* * Build a new XMLTree from the supplied String containing XML.
* * @param text to be rendered * @param textSizeLimit is the maximum length of the text element to be * displayed; use -1, or Integer.MAX_VALUE for unlimited * length * @throws MobyException if there is a XML parsing or I/O error ********************************************************************/ public XMLTree (String text, int textSizeLimit) throws MobyException { this.textSizeLimit = textSizeLimit; init (createDocument (text).getRootElement()); revalidate(); } /********************************************************************* * Build a new XMLTree from the supplied XML document.
* * @param document to be rendered ********************************************************************/ public XMLTree (Document document) { super(); init (document.getRootElement()); revalidate(); } /********************************************************************* * Build a new XMLTree from the supplied XML document.
* * @param document to be rendered * @param textSizeLimit is the maximum length of the text element to be * displayed; use -1, or Integer.MAX_VALUE for unlimited * length ********************************************************************/ public XMLTree (Document document, int textSizeLimit) { super(); this.textSizeLimit = textSizeLimit; init (document.getRootElement()); revalidate(); } /********************************************************************* * Load all icons. ********************************************************************/ protected void loadIcons() { if (nodeIcon == null) nodeIcon = SwingUtils.createIcon ("images/xml_node.gif", XMLTree.class); if (leafIcon == null) leafIcon = SwingUtils.createIcon ("images/leaf.gif", XMLTree.class); } /********************************************************************* * ********************************************************************/ protected Document createDocument (String text) throws MobyException { try { return new SAXBuilder (false) .build (new StringReader (text)); } catch (Exception e) { throw new MobyException (e.toString()); } } /********************************************************************* * ********************************************************************/ private void init (Content content) { loadIcons(); rootElement = (Element)content; // Fix for platforms other than metal which can't otherwise // cope with arbitrary size rows setRowHeight(0); getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION); setShowsRootHandles(true); setEditable(false); setModel(new DefaultTreeModel(createTreeNode(content))); XMLTreeCellRenderer tRend = new XMLTreeCellRenderer(); tRend.setLeafIcon (leafIcon); setCellRenderer (tRend); setAllNodesExpanded(); } public void setAllNodesExpanded() { synchronized (this.getModel()) { expandAll(this, new TreePath(this.getModel().getRoot()), true); } } private void expandAll (JTree tree, TreePath parent, boolean expand) { synchronized (this.getModel()) { // Traverse children // Ignores nodes who's userObject is a Processor type to // avoid overloading the UI with nodes at startup. TreeNode node = (TreeNode) parent.getLastPathComponent(); if (node.getChildCount() >= 0) { for (Enumeration e = node.children(); e.hasMoreElements();) { TreeNode n = (TreeNode) e.nextElement(); TreePath path = parent.pathByAddingChild(n); expandAll(tree, path, expand); } } // Expansion or collapse must be done bottom-up if (expand) tree.expandPath(parent); else tree.collapsePath(parent); } } private XMLNode createTreeNode(Content content) { XMLNode node = new XMLNode(content); if (content instanceof Parent) { Parent parent = (Parent) content; Iterator children = parent.getContent().iterator(); while (children.hasNext()) { Object child = children.next(); if (child instanceof Element) { node.add(createTreeNode((Content) child)); } else if (textSizeLimit != 0 && child instanceof Text) { Text text = (Text) child; if (!text.getTextNormalize().equals("")) { node.add(createTreeNode(text)); } } } } return node; } /********************************************************************* * * Class for a node... * ********************************************************************/ private class XMLNode extends DefaultMutableTreeNode { public XMLNode (Content userObject) { super (userObject); } } /********************************************************************* * * Tree renderer... * ********************************************************************/ private class XMLTreeCellRenderer extends DefaultTreeCellRenderer { public Color getBackgroundNonSelectionColor() { return null; } public Color getBackground() { return null; } public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) { super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus); setOpaque(false); if (value instanceof XMLNode) { XMLNode node = (XMLNode) value; if (node.getUserObject() instanceof Element) { setIcon (nodeIcon); Element element = (Element) node.getUserObject(); StringBuffer nameBuffer = new StringBuffer("" + element.getQualifiedName()); boolean addedAnAttribute = false; // Bit of a quick and dirty hack here to try to ensure // that the element namespace is shown. There appears no // way to get the actual xmlns declarations that are // part of an element through jdom. Also, please note, // theres no namespace handling at all for attributes... if (element.getParent() instanceof Element) { Element parent = (Element) element.getParent(); if (parent.getNamespace(element.getNamespacePrefix()) == null) { nameBuffer.append(" xmlns:" + element.getNamespacePrefix() + "=\"" + element.getNamespaceURI() + "\""); } } else { nameBuffer.append(" xmlns:" + element.getNamespacePrefix() + "=\"" + element.getNamespaceURI() + "\""); } Iterator attributes = element.getAttributes().iterator(); while (attributes.hasNext()) { Attribute attribute = (Attribute) attributes.next(); String name = attribute.getName().trim(); String attributeValue = attribute.getValue().trim(); if (attributeValue != null) { if (attributeValue.length() > 0) { if (addedAnAttribute) { nameBuffer.append(","); } addedAnAttribute = true; nameBuffer.append(" " + name + "=\"" + attributeValue + "\""); } } } nameBuffer.append(""); setText(nameBuffer.toString()); } else if (node.getUserObject() instanceof Text) { Text text = (Text) node.getUserObject(); String name = text.getText(); if (textSizeLimit > -1 && name.length() > textSizeLimit) { name = name.substring(0, textSizeLimit) + "..."; } setText("
"
+ name.replaceAll("
", "\n").replaceAll("<", "<")
+ "");
}
}
setBackground(new Color(0,0,0,0));
return this;
}
}
}