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DomSerializer.java
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DomSerializer.java
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/*******************************************************************************
* Copyright 2011 Zheng Sun
*
* 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.htmlcleaner;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* <p>
* DOM serializer - creates xml DOM.
* </p>
*/
public class DomSerializer {
protected CleanerProperties props;
protected boolean escapeXml = true;
public DomSerializer(final CleanerProperties props, final boolean escapeXml) {
this.props = props;
this.escapeXml = escapeXml;
}
public DomSerializer(final CleanerProperties props) {
this(props, true);
}
public Document createDOM(final TagNode rootNode) throws ParserConfigurationException {
final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
final Document document = factory.newDocumentBuilder().newDocument();
final Element rootElement = createElement(rootNode, document);
document.appendChild(rootElement);
setAttributes(rootNode, rootElement);
createSubnodes(document, rootElement, rootNode.getChildren());
return document;
}
private Element createElement(final TagNode node, final Document document) {
String name = node.getName();
final boolean nsAware = props.isNamespacesAware();
final String prefix = Utils.getXmlNSPrefix(name);
final Map<String, String> nsDeclarations = node.getNamespaceDeclarations();
String nsURI = null;
if (prefix != null) {
if (nsAware) {
if (nsDeclarations != null) {
nsURI = nsDeclarations.get(prefix);
}
if (nsURI == null) {
nsURI = node.getNamespaceURIOnPath(prefix);
}
if (nsURI == null) {
nsURI = prefix;
}
} else {
name = Utils.getXmlName(name);
}
} else {
if (nsAware) {
if (nsDeclarations != null) {
nsURI = nsDeclarations.get("");
}
if (nsURI == null) {
nsURI = node.getNamespaceURIOnPath(prefix);
}
}
}
if (nsAware && nsURI != null) {
return document.createElementNS(nsURI, name);
} else {
return document.createElement(name);
}
}
private void setAttributes(final TagNode node, final Element element) {
for (final Map.Entry<String, String> entry : node.getAttributes().entrySet()) {
final String attrName = entry.getKey();
String attrValue = entry.getValue();
if (escapeXml) {
attrValue = Utils.escapeXml(attrValue, props, true);
}
final String attPrefix = Utils.getXmlNSPrefix(attrName);
if (attPrefix != null) {
if (props.isNamespacesAware()) {
String nsURI = node.getNamespaceURIOnPath(attPrefix);
if (nsURI == null) {
nsURI = attPrefix;
}
element.setAttributeNS(nsURI, attrName, attrValue);
} else {
element.setAttribute(Utils.getXmlName(attrName), attrValue);
}
} else {
element.setAttribute(attrName, attrValue);
}
}
}
private void createSubnodes(final Document document, final Element element, final List<Object> tagChildren) {
if (tagChildren != null) {
final Iterator<Object> it = tagChildren.iterator();
while (it.hasNext()) {
final Object item = it.next();
if (item instanceof CommentNode) {
final CommentNode commentNode = (CommentNode) item;
final Comment comment = document.createComment(commentNode.getContent().toString());
element.appendChild(comment);
} else if (item instanceof ContentNode) {
final String nodeName = element.getNodeName();
String content = item.toString();
final boolean specialCase = props.isUseCdataForScriptAndStyle()
&& ("script".equalsIgnoreCase(nodeName) || "style".equalsIgnoreCase(nodeName));
if (escapeXml && !specialCase) {
content = Utils.escapeXml(content, props, true);
}
element.appendChild(specialCase ? document.createCDATASection(content) : document
.createTextNode(content));
} else if (item instanceof TagNode) {
final TagNode subTagNode = (TagNode) item;
final Element subelement = createElement(subTagNode, document);
setAttributes(subTagNode, subelement);
// recursively create subnodes
createSubnodes(document, subelement, subTagNode.getChildren());
element.appendChild(subelement);
} else if (item instanceof List) {
final List sublist = (List) item;
createSubnodes(document, element, sublist);
}
}
}
}
}