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/*******************************************************************************
* Copyright (c) 2016 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.core.externalization;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.mylyn.internal.tasks.core.ITasksCoreConstants;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.xml.sax.Attributes;
public class SaxOrphanBuilder {
private final Document document;
private Element currentElement;
private StringBuilder currentStringContent;
private final Element orphansElement;
public SaxOrphanBuilder() throws CoreException {
this.document = createDocument();
this.orphansElement = document.getDocumentElement();
}
private Document createDocument() throws CoreException {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db;
try {
db = dbf.newDocumentBuilder();
Document document = db.newDocument();
Element root = document.createElement("orphans"); //$NON-NLS-1$
document.appendChild(root);
return document;
} catch (ParserConfigurationException e) {
throw new CoreException(
new Status(IStatus.ERROR, ITasksCoreConstants.ID_PLUGIN, "Failed to create document", e)); //$NON-NLS-1$
}
}
public void startElement(String localName, Attributes attributes) {
Element element = document.createElement(localName);
for (int i = 0; i < attributes.getLength(); i++) {
String attributeName = attributes.getLocalName(i);
String attributeValue = attributes.getValue(i);
element.setAttribute(attributeName, attributeValue);
}
if (currentElement != null) {
appendTextNode();
currentElement.appendChild(element);
}
currentElement = element;
currentStringContent = new StringBuilder();
}
public void acceptCharacters(char[] content, int start, int length) {
if (currentStringContent != null) {
currentStringContent.append(content, start, length);
}
}
public void endElement() {
if (currentElement != null) {
appendTextNode();
Node parentNode = currentElement.getParentNode();
// do not set the current element to be the orphans element or all tasks will end up as orphans
if (parentNode instanceof Element && parentNode != orphansElement) {
currentElement = (Element) parentNode;
currentStringContent = new StringBuilder();
} else {
currentElement = null;
currentStringContent = null;
}
}
}
public void commitOrphan() {
if (currentElement != null) {
document.getDocumentElement().appendChild(currentElement);
}
}
private void appendTextNode() {
if (hasStringContnet()) {
Text textNode = document.createTextNode(currentStringContent.toString());
currentElement.appendChild(textNode);
}
}
private boolean hasStringContnet() {
return currentStringContent != null & currentStringContent.length() > 0;
}
public Document getOrphans() {
return document;
}
}
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