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package com.deepoove.poi;

import java.lang.reflect.Field;
import java.util.List;

import org.apache.poi.xwpf.usermodel.XWPFAbstractNum;
import org.apache.poi.xwpf.usermodel.XWPFNum;
import org.apache.poi.xwpf.usermodel.XWPFNumbering;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This is a utility class so that I can get access to the protected fields
 * within XWPFNumbering.
 */
public class NumberingWrapper {

    private static Logger logger = LoggerFactory.getLogger(NumberingWrapper.class);

    private final XWPFNumbering numbering;

    private List nums;

    private List abstractNums;

    public NumberingWrapper(XWPFNumbering numbering) {
        this.numbering = numbering;
        this.nums = tryGetNums();
        this.abstractNums = tryGetAbstractNums();
    }

    @SuppressWarnings("unchecked")
    private List tryGetNums() {
        try {
            Field field = XWPFNumbering.class.getDeclaredField("nums");
            field.setAccessible(true);
            return (List) field.get(this.numbering);
        } catch (Exception e) {
            logger.error("Cannot get XWPFNumbering nums", e);
        }
        return null;
    }

    @SuppressWarnings("unchecked")
    private List tryGetAbstractNums() {
        try {
            Field field = XWPFNumbering.class.getDeclaredField("abstractNums");
            field.setAccessible(true);
            return (List) field.get(this.numbering);
        } catch (Exception e) {
            logger.error("Cannot get XWPFNumbering abstractNums", e);
        }
        return null;
    }

    public List getAbstractNums() {
        return abstractNums;
    }

    public List getNums() {
        return nums;
    }

    public XWPFNumbering getNumbering() {
        return numbering;
    }

    public int getAbstractNumsSize() {
        return abstractNums == null ? 0 : abstractNums.size();
    }

}