2fd6ccd490
git-svn-id: svn://svn.code.sf.net/p/writer2latex/code/trunk@174 f0f2a975-2e09-46c8-9428-3b39399b9f3c
134 lines
4 KiB
Java
134 lines
4 KiB
Java
/************************************************************************
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*
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* SimpleDOMBuilder.java
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* Copyright: 2002-2014 by Henrik Just
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*
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* All Rights Reserved.
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*
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* Version 1.4 (2014-09-16)
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*
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*/
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package writer2latex.util;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.ParserConfigurationException;
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import org.w3c.dom.DOMImplementation;
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import org.w3c.dom.Document;
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import org.w3c.dom.DocumentType;
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import org.w3c.dom.Element;
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/** This class provides a simple way to create and populate a DOM tree in logical order
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*/
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public class SimpleDOMBuilder {
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private Document dom=null;
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private Element currentElement=null;
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private StringBuilder charBuffer=new StringBuilder();
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/**
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* Append an element to the current element and set this new element to be the current element.
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* If there is no current element, a new DOM tree will be created (discarding the current DOM tree if any)
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* with the new element as the document element.
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*
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* @param sTagName
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* @return true on success
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*/
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public boolean startElement(String sTagName) {
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if (currentElement!=null) {
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flushCharacters();
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currentElement = (Element) currentElement.appendChild(dom.createElement(sTagName));
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}
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else {
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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try {
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DocumentBuilder builder = factory.newDocumentBuilder();
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DOMImplementation domImpl = builder.getDOMImplementation();
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DocumentType doctype = domImpl.createDocumentType(sTagName, "", "");
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dom = domImpl.createDocument("",sTagName,doctype);
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currentElement = dom.getDocumentElement();
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} catch (ParserConfigurationException e) {
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return false;
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}
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}
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return true;
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}
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/**
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* Set the current element to the parent of the current element
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* @return true on success, false if there is no current element to end
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*/
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public boolean endElement() {
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if (currentElement!=null) {
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flushCharacters();
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if (currentElement!=dom.getDocumentElement()) {
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currentElement=(Element) currentElement.getParentNode();
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}
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else { // Back at document element: Finished populating the DOM tree
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currentElement=null;
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}
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return true;
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}
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return false;
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}
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/**
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* Set an attribute of the current element
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* @param sName
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* @param sValue
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* @return true on success, false if there is no current element
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*/
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public boolean setAttribute(String sName,String sValue) {
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if (currentElement!=null) {
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currentElement.setAttribute(sName, sValue);
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return true;
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}
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return false;
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}
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/**
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* Add characters to the currentElement. The actual writing of characters to the DOM is delayed until the
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* <code>startElement</code> or <code>endElement</code> methods are invoked
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* @param sText
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* @return true on success, false if there is no current element
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*/
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public boolean characters(String sText) {
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if (currentElement!=null) {
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charBuffer.append(sText);
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return true;
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}
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return false;
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}
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private void flushCharacters() {
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if (charBuffer.length()>0) {
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currentElement.appendChild(dom.createTextNode(charBuffer.toString()));
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charBuffer.setLength(0);
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}
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}
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/**
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* Get the DOM tree
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*
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* @return the DOM tree, or null if none has been created
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*/
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public Document getDOM() {
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return dom;
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}
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}
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