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/*******************************************************************************
* Copyright (c) 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.internal.dynamic;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/*
* A DOM node adapter/proxy - provides the same interface as Node but instead
* reads and writes to an underlying DOM node. This allows us to use the same
* processor for two models, by adapting one of them.
*/
public class DocumentNode extends org.eclipse.help.Node {
private Node node;
/*
* Creates an adapter for the given DOM node. All operations on this node
* will be performed on the given node instead.
*/
public DocumentNode(Node node) {
this.node = node;
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#appendChild(org.eclipse.help.Node)
*/
public void appendChild(org.eclipse.help.Node newChild) {
DocumentNode newNode = copyNode(newChild);
node.appendChild(newNode.node);
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#getAttribute(java.lang.String)
*/
public String getAttribute(String name) {
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element elem = (Element)node;
if (elem.hasAttribute(name)) {
return elem.getAttribute(name);
}
}
return null;
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#getAttributes()
*/
public Set getAttributes() {
if (node.getNodeType() == Node.ELEMENT_NODE) {
NamedNodeMap map = node.getAttributes();
Set names = new HashSet();
for (int i=0;i<map.getLength();++i) {
Node attribute = map.item(i);
names.add(attribute.getNodeName());
}
return names;
}
return new HashSet(0);
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#getChildren()
*/
public org.eclipse.help.Node[] getChildren() {
if (node.hasChildNodes()) {
List children = new ArrayList();
NodeList list = node.getChildNodes();
for (int i=0;i<list.getLength();++i) {
Node child = list.item(i);
if (child.getNodeType() == Node.ELEMENT_NODE || child.getNodeType() == Node.TEXT_NODE) {
children.add(new DocumentNode(child));
}
}
return (org.eclipse.help.Node[])children.toArray(new org.eclipse.help.Node[children.size()]);
}
return new org.eclipse.help.Node[0];
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#getName()
*/
public String getName() {
return node.getNodeName();
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#getParent()
*/
public org.eclipse.help.Node getParent() {
return new DocumentNode(node.getParentNode());
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#getValue()
*/
public String getValue() {
return node.getNodeValue();
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#insertBefore(org.eclipse.help.Node, org.eclipse.help.Node)
*/
public void insertBefore(org.eclipse.help.Node newChild, org.eclipse.help.Node refChild) {
if (refChild instanceof DocumentNode) {
DocumentNode newNode = copyNode(newChild);
node.insertBefore(newNode.node, ((DocumentNode)refChild).node);
}
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#removeAttribute(java.lang.String)
*/
public void removeAttribute(String name) {
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element elem = (Element)node;
elem.removeAttribute(name);
}
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#removeChild(org.eclipse.help.Node)
*/
public void removeChild(org.eclipse.help.Node nodeToRemove) {
if (nodeToRemove instanceof DocumentNode) {
node.removeChild(((DocumentNode)nodeToRemove).node);
}
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#setAttribute(java.lang.String, java.lang.String)
*/
public void setAttribute(String name, String value) {
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element elem = (Element)node;
elem.setAttribute(name, value);
}
}
/* (non-Javadoc)
* @see org.eclipse.help.Node#setValue(java.lang.String)
*/
public void setValue(String value) {
node.setNodeValue(value);
}
/*
* Copies the given node as a DOMNode for this document.
*/
private DocumentNode copyNode(org.eclipse.help.Node nodeToCopy) {
// copy the node itself
Document dom = node.getOwnerDocument();
Node newNode;
if (nodeToCopy.getValue() == null) {
newNode = dom.createElement(nodeToCopy.getName());
}
else {
newNode = dom.createTextNode(nodeToCopy.getValue());
}
if (newNode.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element)newNode;
Iterator iter = nodeToCopy.getAttributes().iterator();
while (iter.hasNext()) {
String name = (String)iter.next();
element.setAttribute(name, nodeToCopy.getAttribute(name));
}
}
// copy children
DocumentNode copy = new DocumentNode(newNode);
org.eclipse.help.Node[] children = nodeToCopy.getChildren();
for (int i=0;i<children.length;++i) {
copy.appendChild(children[i]);
}
return copy;
}
}
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