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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.model.fields;

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

import javax.xml.bind.JAXBElement;

import org.docx4j.TraversalUtil.CallbackImpl;
import org.docx4j.wml.FldChar;
import org.docx4j.wml.P;
import org.docx4j.wml.STFldCharType;
import org.jvnet.jaxb2_commons.ppp.Child;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

	
public class ComplexFieldLocator extends CallbackImpl {
	
	private static Logger log = LoggerFactory.getLogger(ComplexFieldLocator.class);
	
	/**
	 * A list of paragraphs containing field begins.
	 * 
	 * If the paragraph contains 2 fields or nested fields, 
	 * it will still be listed just once
	 */
	List
 starts = new ArrayList
();	
	public List
 getStarts() {
		return starts;
	}

//	P currentP;
	int depth=0;

	@Override
	public List apply(Object o) {

//		System.out.println(o.getClass().getName());
		
//		if (o instanceof P) {
//			currentP = (P)o;
//		}
		
		if (o instanceof org.docx4j.wml.FldChar) {
			FldChar fldChar = (FldChar)o;
			if (fldChar.getFldCharType().equals(STFldCharType.BEGIN) ) {
				//System.out.println("Found a BEGIN");
				depth++;
				P currentP = pStack.peek();
				if (depth==1 && !starts.contains(currentP)) {
					starts.add(currentP);
//					System.out.println("Adding " + XmlUtils.marshaltoString(currentP));
				}
			}
			if (fldChar.getFldCharType().equals(STFldCharType.END) ) {
				depth--;
			}
		}
		
		return null;
	}
	
	/*
	 * Need a paragraph stack, to accommodate:
	 * 
	 *         
		            
		                
		                    
		                        
		                            
		                                
                                    
	 * 
	 */
	private LinkedList
 pStack = new LinkedList
(); 
	
	@Override // so we can manage the stack
	public void walkJAXBElements(Object parent) {
		
		if (parent instanceof P) {
			pStack.push((P)parent);
		}

		super.walkJAXBElements(parent);
		
		if (parent instanceof P) {
			pStack.pop();
		}
		
	}	
}
	

 















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