/*
* 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.
*
* Started from
* https://svn.apache.org/repos/asf/stanbol/trunk/enhancement-engines/htmlextractor/src/
* main/java/org/apache/stanbol/enhancer/engines/htmlextractor/impl/DOMBuilder.java
*/
package com.digitalpebble.stormcrawler.parse;
import java.util.HashMap;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.html.dom.HTMLDocumentImpl;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Node;
/**
* TODO use org.jsoup.helper.W3CDom instead?
*
* @author <a href="mailto:kasper@dfki.de">Walter Kasper</a>
*/
public final class JSoupDOMBuilder {
/**
* Restrict instantiation
*/
private JSoupDOMBuilder() {
}
/**
* Returns a W3C DOM that exposes the same content as the supplied Jsoup
* document into a W3C DOM.
*
* @param jsoupDocument
* The Jsoup document to convert.
* @return A W3C Document.
*/
public static Document jsoup2DOM(org.jsoup.nodes.Document jsoupDocument) {
Document document;
try {
/* Obtain the document builder for the configured XML parser. */
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
/* Create a document to contain the content. */
document = docBuilder.newDocument();
createDOM(jsoupDocument, document, document,
new HashMap<String, String>());
} catch (ParserConfigurationException pce) {
throw new RuntimeException(pce);
}
return document;
}
public static DocumentFragment jsoup2HTML(
org.jsoup.nodes.Document jsoupDocument) {
HTMLDocumentImpl htmlDoc = new HTMLDocumentImpl();
htmlDoc.setErrorChecking(false);
DocumentFragment fragment = htmlDoc.createDocumentFragment();
createDOM(jsoupDocument, fragment, htmlDoc,
new HashMap<String, String>());
return fragment;
}
/**
* The internal helper that copies content from the specified Jsoup
* <tt>Node</tt> into a W3C {@link Node}.
*
* @param node
* The Jsoup node containing the content to copy to the specified
* W3C {@link Node}.
* @param out
* The W3C {@link Node} that receives the DOM content.
*/
public static void createDOM(org.jsoup.nodes.Node node, Node out,
Document doc, Map<String, String> ns) {
if (node instanceof org.jsoup.nodes.Document) {
org.jsoup.nodes.Document d = (org.jsoup.nodes.Document) node;
for (org.jsoup.nodes.Node n : d.childNodes()) {
createDOM(n, out, doc, ns);
}
} else if (node instanceof org.jsoup.nodes.Element) {
org.jsoup.nodes.Element e = (org.jsoup.nodes.Element) node;
org.w3c.dom.Element _e = doc.createElement(e.tagName());
out.appendChild(_e);
org.jsoup.nodes.Attributes atts = e.attributes();
for (org.jsoup.nodes.Attribute a : atts) {
String attName = a.getKey();
// omit xhtml namespace
if (attName.equals("xmlns")) {
continue;
}
String attPrefix = getNSPrefix(attName);
if (attPrefix != null) {
if (attPrefix.equals("xmlns")) {
ns.put(getLocalName(attName), a.getValue());
} else if (!attPrefix.equals("xml")) {
String namespace = ns.get(attPrefix);
if (namespace == null) {
// fix attribute names looking like qnames
attName = attName.replace(':', '_');
}
}
}
_e.setAttribute(attName, a.getValue());
}
for (org.jsoup.nodes.Node n : e.childNodes()) {
createDOM(n, _e, doc, ns);
}
} else if (node instanceof org.jsoup.nodes.TextNode) {
org.jsoup.nodes.TextNode t = (org.jsoup.nodes.TextNode) node;
if (!(out instanceof Document)) {
out.appendChild(doc.createTextNode(t.text()));
}
} else if (node instanceof org.jsoup.nodes.Comment) {
if (!(out instanceof Document)) {
org.jsoup.nodes.Comment comment = (org.jsoup.nodes.Comment) node;
out.appendChild(doc.createComment(comment.getData()));
}
} else if (node instanceof org.jsoup.nodes.DataNode) {
if (!(out instanceof Document)) {
org.jsoup.nodes.DataNode sourceData = (org.jsoup.nodes.DataNode) node;
String whole = sourceData.getWholeData();
out.appendChild(doc.createTextNode(whole));
}
}
}
// some hacks for handling namespace in jsoup2DOM conversion
private static String getNSPrefix(String name) {
if (name != null) {
int pos = name.indexOf(':');
if (pos > 0) {
return name.substring(0, pos);
}
}
return null;
}
private static String getLocalName(String name) {
if (name != null) {
int pos = name.lastIndexOf(':');
if (pos > 0) {
return name.substring(pos + 1);
}
}
return name;
}
}