Displays a DOM document in a tree control.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.Serializable;
import java.util.Hashtable;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Displays a DOM document in a tree control.
*
* @author Andy Clark, IBM
* @version $Id: DOMTree.java 447689 2006-09-19 02:40:36Z mrglavas $
*/
public class DOMTree extends JTree {
private static final long serialVersionUID = 3977582510937224497L;
//
// Constructors
//
/** Default constructor. */
public DOMTree() {
this(null);
}
/** Constructs a tree with the specified document. */
public DOMTree(Document document) {
super(new Model());
// set tree properties
setRootVisible(false);
// set properties
setDocument(document);
} // <init>()
//
// Public methods
//
/** Sets the document. */
public void setDocument(Document document) {
((Model) getModel()).setDocument(document);
expandRow(0);
}
/** Returns the document. */
public Document getDocument() {
return ((Model) getModel()).getDocument();
}
/** get the org.w3c.Node for a MutableTreeNode. */
public Node getNode(Object treeNode) {
return ((Model) getModel()).getNode(treeNode);
}
//
// Classes
//
/**
* DOM tree model.
*
* @author Andy Clark, IBM
* @version
*/
static class Model extends DefaultTreeModel implements Serializable {
private static final long serialVersionUID = 3257286915924571186L;
//
// Data
//
/** Document. */
private Document document;
/** Node Map. */
private Hashtable nodeMap = new Hashtable();
//
// Constructors
//
/** Default constructor. */
public Model() {
this(null);
}
/** Constructs a model from the specified document. */
public Model(Document document) {
super(new DefaultMutableTreeNode());
setDocument(document);
}
//
// Public methods
//
/** Sets the document. */
public synchronized void setDocument(Document document) {
// save document
this.document = document;
// clear tree and re-populate
((DefaultMutableTreeNode) getRoot()).removeAllChildren();
nodeMap.clear();
buildTree();
fireTreeStructureChanged(this, new Object[] { getRoot() }, new int[0], new Object[0]);
} // setDocument(Document)
/** Returns the document. */
public Document getDocument() {
return document;
}
/** get the org.w3c.Node for a MutableTreeNode. */
public Node getNode(Object treeNode) {
return (Node) nodeMap.get(treeNode);
}
//
// Private methods
//
/** Builds the tree. */
private void buildTree() {
// is there anything to do?
if (document == null) {
return;
}
// iterate over children of this node
NodeList nodes = document.getChildNodes();
int len = (nodes != null) ? nodes.getLength() : 0;
MutableTreeNode root = (MutableTreeNode) getRoot();
for (int i = 0; i < len; i++) {
Node node = nodes.item(i);
switch (node.getNodeType()) {
case Node.DOCUMENT_NODE: {
root = insertDocumentNode(node, root);
break;
}
case Node.ELEMENT_NODE: {
insertElementNode(node, root);
break;
}
default: // ignore
} // switch
} // for
} // buildTree()
/** Inserts a node and returns a reference to the new node. */
private MutableTreeNode insertNode(String what, MutableTreeNode where) {
MutableTreeNode node = new DefaultMutableTreeNode(what);
insertNodeInto(node, where, where.getChildCount());
return node;
} // insertNode(Node,MutableTreeNode):MutableTreeNode
/** Inserts the document node. */
private MutableTreeNode insertDocumentNode(Node what, MutableTreeNode where) {
MutableTreeNode treeNode = insertNode("<" + what.getNodeName() + '>', where);
nodeMap.put(treeNode, what);
return treeNode;
}
/** Inserts an element node. */
private MutableTreeNode insertElementNode(Node what, MutableTreeNode where) {
// build up name
StringBuffer name = new StringBuffer();
name.append('<');
name.append(what.getNodeName());
NamedNodeMap attrs = what.getAttributes();
int attrCount = (attrs != null) ? attrs.getLength() : 0;
for (int i = 0; i < attrCount; i++) {
Node attr = attrs.item(i);
name.append(' ');
name.append(attr.getNodeName());
name.append("=\"");
name.append(attr.getNodeValue());
name.append('"');
}
name.append('>');
// insert element node
MutableTreeNode element = insertNode(name.toString(), where);
nodeMap.put(element, what);
// gather up attributes and children nodes
NodeList children = what.getChildNodes();
int len = (children != null) ? children.getLength() : 0;
for (int i = 0; i < len; i++) {
Node node = children.item(i);
switch (node.getNodeType()) {
case Node.CDATA_SECTION_NODE: {
insertCDataSectionNode(node, element); // Add a Section Node
break;
}
case Node.TEXT_NODE: {
insertTextNode(node, element);
break;
}
case Node.ELEMENT_NODE: {
insertElementNode(node, element);
break;
}
}
}
return element;
} // insertElementNode(Node,MutableTreeNode):MutableTreeNode
/** Inserts a text node. */
private MutableTreeNode insertTextNode(Node what, MutableTreeNode where) {
String value = what.getNodeValue().trim();
if (value.length() > 0) {
MutableTreeNode treeNode = insertNode(value, where);
nodeMap.put(treeNode, what);
return treeNode;
}
return null;
}
/** Inserts a CData Section Node. */
private MutableTreeNode insertCDataSectionNode(Node what, MutableTreeNode where) {
StringBuffer CSectionBfr = new StringBuffer();
CSectionBfr.append(what.getNodeValue());
if (CSectionBfr.length() > 0) {
MutableTreeNode treeNode = insertNode(CSectionBfr.toString(), where);
nodeMap.put(treeNode, what);
return treeNode;
}
return null;
}
} // class Model
} // class DOMTree
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