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/*
* 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.
*/
package org.apache.tuscany.sca.databinding.impl;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.tuscany.sca.databinding.TransformationContext;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.util.XMLType;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
* Helper for DOM
*
* @version $Rev$ $Date$
*/
public final class DOMHelper {
private static DocumentBuilderFactory FACTORY;
private DOMHelper() {
}
public static Document newDocument() throws ParserConfigurationException {
return newDocumentBuilder().newDocument();
}
public static DocumentBuilder newDocumentBuilder() throws ParserConfigurationException {
init();
return FACTORY.newDocumentBuilder();
}
/**
*
*/
private static synchronized void init() {
if (FACTORY == null) {
FACTORY = DocumentBuilderFactory.newInstance();
FACTORY.setNamespaceAware(true);
}
}
public static QName getQName(Node node) {
String ns = node.getNamespaceURI();
if (ns == null) {
ns = "";
}
// node.getLocalName() will return null if it is created using DOM Level
// 1 method
// such as createElement()
return new QName(ns, node.getNodeName());
}
public static Element createElement(Document document, QName name) {
String prefix = name.getPrefix();
String qname =
(prefix != null && prefix.length() > 0) ? prefix + ":" + name.getLocalPart() : name.getLocalPart();
return document.createElementNS(name.getNamespaceURI(), qname);
}
/**
* Wrap an element as a DOM document
* @param node
* @return
*/
public static Document promote(Node node) {
if (node instanceof Document) {
return (Document)node;
}
Element element = (Element)node;
Document doc = element.getOwnerDocument();
if (doc.getDocumentElement() == element) {
return doc;
}
doc = (Document)element.getOwnerDocument().cloneNode(false);
Element schema = (Element)doc.importNode(element, true);
doc.appendChild(schema);
Node parent = element.getParentNode();
while (parent instanceof Element) {
Element root = (Element)parent;
NamedNodeMap nodeMap = root.getAttributes();
for (int i = 0; i < nodeMap.getLength(); i++) {
Attr attr = (Attr)nodeMap.item(i);
String name = attr.getName();
if ("xmlns".equals(name) || name.startsWith("xmlns:")) {
if (schema.getAttributeNode(name) == null) {
schema.setAttributeNodeNS((Attr)doc.importNode(attr, true));
}
}
}
parent = parent.getParentNode();
}
return doc;
}
/**
* @param context
* @param element
*/
public static Element adjustElementName(TransformationContext context, Element element) {
if (context != null) {
DataType dataType = context.getTargetDataType();
Object logical = dataType == null ? null : dataType.getLogical();
if (!(logical instanceof XMLType)) {
return element;
}
XMLType xmlType = (XMLType)logical;
QName name = new QName(element.getNamespaceURI(), element.getLocalName());
if (xmlType.isElement() && !xmlType.getElementName().equals(name)) {
QName newName = xmlType.getElementName();
String prefix = newName.getPrefix();
String qname = newName.getLocalPart();
if (prefix != null && !prefix.equals("")) {
qname = prefix + ":" + qname;
}
Document doc = element.getOwnerDocument();
Element newElement = doc.createElementNS(newName.getNamespaceURI(), qname);
// Copy the attributes to the new element
NamedNodeMap attrs = element.getAttributes();
for (int i = 0; i < attrs.getLength(); i++) {
Attr attr = (Attr)doc.importNode(attrs.item(i), true);
newElement.getAttributes().setNamedItem(attr);
}
// Move all the children
while (element.hasChildNodes()) {
newElement.appendChild(element.getFirstChild());
}
// Replace the old node with the new node
if (element.getParentNode() != null) {
element.getParentNode().replaceChild(newElement, element);
}
return newElement;
}
}
return element;
}
}
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