/*
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.xwiki.officeimporter.internal.filter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.inject.Named;
import javax.inject.Singleton;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xwiki.component.annotation.Component;
import org.xwiki.xml.html.filter.AbstractHTMLFilter;
/**
* Filters duplicated anchors.
* <p>
* The HTML generated by the office server includes anchors of the form:
*
* <pre>
* {@code <a name="table1">
* <h1>Sheet 1: <em>Hello</em></h1>
* </a>}
* </pre>
*
* and the default HTML cleaner converts them to:
*
* <pre>
* {@code <a name="table1"/>
* <h1>
* <a name="table1">Sheet 1: <em>Hello</em></a>
* </h1>}
* </pre>
*
* this is because of the close-before-copy-inside behavior of default HTML cleaner. Thus the additional (copy-inside)
* anchor needs to be ripped off.
*
* @version $Id: b28ccd7da39771c4c2c4b6a7d3b500e3e896086b $
* @since 1.8M1
*/
@Component
@Named("officeimporter/anchor")
@Singleton
public class AnchorFilter extends AbstractHTMLFilter
{
@Override
public void filter(Document document, Map<String, String> cleaningParameters)
{
List<Element> links = filterDescendants(document.getDocumentElement(), new String[] {TAG_A});
Set<String> fragmentIdentifiers = new HashSet<String>();
List<Element> anchorsToRemove = new ArrayList<Element>();
for (Element link : links) {
if (isAnchor(link)) {
String fragmentIdentifier = link.getAttribute(ATTRIBUTE_NAME);
if (fragmentIdentifiers.contains(fragmentIdentifier)) {
anchorsToRemove.add(link);
}
fragmentIdentifiers.add(fragmentIdentifier);
}
}
for (Element anchor : anchorsToRemove) {
replaceWithChildren(anchor);
}
}
/**
* Checks whether the given node represents an HTML anchor.
*
* <pre>
* {@code <a name="Chapter1"/>}
* </pre>
*
* @param node the {@link Node}
* @return {@code true} if the node represents an anchor, {@code false} otherwise
*/
private boolean isAnchor(Node node)
{
return node instanceof Element && !"".equals(((Element) node).getAttribute(ATTRIBUTE_NAME));
}
}