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docx4j is a library which helps you to work with the Office Open XML file format as used in docx documents, pptx presentations, and xlsx spreadsheets.
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/*
   Licensed to Plutext Pty Ltd under one or more contributor license agreements.  
   
 *  This file is part of docx4j.

    docx4j is 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.docx4j.convert.out.html;

import java.util.List;

import org.docx4j.convert.out.HTMLSettings;
import org.docx4j.convert.out.common.AbstractVisitorExporterDelegate;
import org.docx4j.convert.out.common.ConversionSectionWrapper;
import org.docx4j.convert.out.common.XsltCommonFunctions;
import org.docx4j.openpackaging.exceptions.Docx4JException;
import org.docx4j.openpackaging.parts.Part;
import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;
import org.docx4j.wml.CTFtnEdn;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class HTMLExporterVisitorDelegate extends AbstractVisitorExporterDelegate {

	protected HTMLExporterVisitorDelegate() {
		super(HTMLExporterVisitorGenerator.GENERATOR_FACTORY);
	}

	@Override
	protected Element createDocumentRoot(HTMLConversionContext conversionContext, Document document) throws Docx4JException {
		return document.createElement("html");
	}

	@Override
	protected void appendDocumentHeader(HTMLConversionContext conversionContext, Document document, Element documentRoot) throws Docx4JException {
    Element	headEl = document.createElement("head");
	Element meta = document.createElement("meta");
	Element element = null;
	StringBuilder buffer = new StringBuilder(10240);
	String userCSS = conversionContext.getUserCSS();
	String userScript = conversionContext.getUserScript();
	
	boolean hasDefaultHeader = false;
	boolean hasDefaultFooter = false;
    	documentRoot.appendChild(headEl);    	
    	meta.setAttribute("http-equiv", "Content-Type");
    	meta.setAttribute("content", "text/html; charset=utf-8");
    	headEl.appendChild(meta);
    	
    	//TODO: This doesn't quite work as the defaultHeader and defaultFooter are per section,
    	//but this definition is on the document level. 
    	//To access the first section, we have to call first a next() and later return to start()
    	try {
    		conversionContext.getSections().next();
        	hasDefaultHeader = XsltCommonFunctions.hasDefaultHeader(conversionContext);
        	hasDefaultFooter = XsltCommonFunctions.hasDefaultHeader(conversionContext);
    	}
    	finally {
    		conversionContext.getSections().start();
    	}
    	HtmlCssHelper.createDefaultCss(hasDefaultHeader, hasDefaultFooter, buffer);
		HtmlCssHelper.createCssForStyles(conversionContext.getWmlPackage(), 
										 conversionContext.getStyleTree(), 
										 buffer);
		if ((userCSS != null) && (userCSS.length() > 0)) {
			buffer.append(userCSS);
		}
		element = conversionContext.createStyleElement(document, buffer.toString());
		if (element != null) {
			headEl.appendChild(element);
		}
		buffer.setLength(0);
		HtmlScriptHelper.createDefaultScript(buffer);
		if ((userScript != null) && (userScript.length() > 0)) {
			buffer.append(userScript);
		}
		element = conversionContext.createScriptElement(document, buffer.toString());
		if (element != null) {
			headEl.appendChild(element);
		}
	}

	@Override
	protected Element createDocumentBody(HTMLConversionContext conversionContext, Document document, Element documentRoot) {
		return document.createElement("body");
	}

	@Override
	protected Element createSectionRoot(
			HTMLConversionContext conversionContext, Document document,
			ConversionSectionWrapper sectionWrapper, Element currentParent)
			throws Docx4JException {
		// A div for each section might make sense, but docx2xhtml doesn't use it,
		// for this reason we don't do it here.
		return null;
	}

	@Override
	protected void appendSectionHeader(HTMLConversionContext conversionContext,
			Document document, ConversionSectionWrapper sectionWrapper,
			Element currentParent) throws Docx4JException {
		if (XsltCommonFunctions.hasDefaultHeader(conversionContext)) {
			appendPartContent(
				conversionContext, document,
				sectionWrapper, currentParent, 
				"header",
				sectionWrapper.getHeaderFooterPolicy().getDefaultHeader(),
				sectionWrapper.getHeaderFooterPolicy().getDefaultHeader().getJaxbElement().getContent());
		}
	}

	@Override
	protected Element createSectionBody(
			HTMLConversionContext conversionContext, Document document,
			ConversionSectionWrapper sectionWrapper, Element currentParent)
			throws Docx4JException {
    Element	div = document.createElement("div");
    	div.setAttribute("class", "document");
    	return div;
	}

	@Override
	protected void appendSectionFooter(HTMLConversionContext conversionContext,
			Document document, ConversionSectionWrapper sectionWrapper,
			Element currentParent) throws Docx4JException {
		if (XsltCommonFunctions.hasDefaultFooter(conversionContext)) {
			appendPartContent(
				conversionContext, document,
				sectionWrapper, currentParent, 
				"footer",
				sectionWrapper.getHeaderFooterPolicy().getDefaultFooter(),
				sectionWrapper.getHeaderFooterPolicy().getDefaultFooter().getJaxbElement().getContent());
		}
	}

	protected void appendPartContent(HTMLConversionContext conversionContext, 
								  	 Document document, 
								     ConversionSectionWrapper sectionWrapper, 
								     Element currentParent,
								     String className, Part part, List