/*
* Copyright 2005-2014 the original author or authors.
*
* Licensed 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.springframework.xml.dom;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.springframework.util.Assert;
/**
* SAX {@code ContentHandler} that transforms callback calls to DOM {@code Node}s.
*
* @author Arjen Poutsma
* @see org.w3c.dom.Node
* @since 1.0.0
*/
public class DomContentHandler implements ContentHandler {
private final Document document;
private final List<Element> elements = new ArrayList<Element>();
private final Node node;
/**
* Creates a new instance of the {@code DomContentHandler} with the given node.
*
* @param node the node to publish events to
*/
public DomContentHandler(Node node) {
Assert.notNull(node, "node must not be null");
this.node = node;
if (node instanceof Document) {
document = (Document) node;
}
else {
document = node.getOwnerDocument();
}
Assert.notNull(document, "document must not be null");
}
private Node getParent() {
if (!elements.isEmpty()) {
return elements.get(elements.size() - 1);
}
else {
return node;
}
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
Node parent = getParent();
Element element = document.createElementNS(uri, qName);
for (int i = 0; i < attributes.getLength(); i++) {
String attrUri = attributes.getURI(i);
String attrQname = attributes.getQName(i);
String value = attributes.getValue(i);
if (!attrQname.startsWith("xmlns")) {
element.setAttributeNS(attrUri, attrQname, value);
}
}
element = (Element) parent.appendChild(element);
elements.add(element);
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
elements.remove(elements.size() - 1);
}
@Override
public void characters(char ch[], int start, int length) throws SAXException {
String data = new String(ch, start, length);
Node parent = getParent();
Node lastChild = parent.getLastChild();
if (lastChild != null && lastChild.getNodeType() == Node.TEXT_NODE) {
((Text) lastChild).appendData(data);
}
else {
Text text = document.createTextNode(data);
parent.appendChild(text);
}
}
@Override
public void processingInstruction(String target, String data) throws SAXException {
Node parent = getParent();
ProcessingInstruction pi = document.createProcessingInstruction(target, data);
parent.appendChild(pi);
}
/*
* Unsupported
*/
@Override
public void setDocumentLocator(Locator locator) {
}
@Override
public void startDocument() throws SAXException {
}
@Override
public void endDocument() throws SAXException {
}
@Override
public void startPrefixMapping(String prefix, String uri) throws SAXException {
}
@Override
public void endPrefixMapping(String prefix) throws SAXException {
}
@Override
public void ignorableWhitespace(char ch[], int start, int length) throws SAXException {
}
@Override
public void skippedEntity(String name) throws SAXException {
}
}