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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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package org.docx4j.finders;

import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBElement;

import org.docx4j.XmlUtils;
import org.docx4j.TraversalUtil.CallbackImpl;
import org.docx4j.wml.CommentRangeEnd;
import org.docx4j.wml.CommentRangeStart;
import org.docx4j.wml.R.CommentReference;
import org.jvnet.jaxb2_commons.ppp.Child;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public  class CommentFinder extends CallbackImpl {
	
	protected static Logger log = LoggerFactory.getLogger(CommentFinder.class);	
	

    List commentElements = new ArrayList();

    /**
	 * @return the commentElements
	 */
	public List getCommentElements() {
		return commentElements;
	}

	@Override
    public List apply(Object o) {

        if (o instanceof javax.xml.bind.JAXBElement
                && (((JAXBElement)o).getName().getLocalPart().equals("commentReference")
                		|| ((JAXBElement)o).getName().getLocalPart().equals("commentRangeStart")
                		|| ((JAXBElement)o).getName().getLocalPart().equals("commentRangeEnd")	                            		
                		)) {
//        		log.debug(((JAXBElement)o).getName().getLocalPart());
                commentElements.add( (Child)XmlUtils.unwrap(o) );
            } 
        else if (o instanceof CommentReference || 
            o instanceof CommentRangeStart || 
            o instanceof CommentRangeEnd) {
//        	log.debug(o.getClass().getName());
            commentElements.add((Child)o);
        }
        return null;
    }

}	
 















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