Here you can find the source of formatElementEnd( Document document, Element element, String formatString)
@SuppressWarnings({ "ChainOfInstanceofChecks" }) private static void formatElementEnd( Document document, Element element, String formatString)
//package com.java2s; //License from project: Open Source License import org.w3c.dom.*; public class Main { @SuppressWarnings({ "ChainOfInstanceofChecks" }) private static void formatElementEnd(/*@Nonnull*/ Document document, /*@Nonnull*/ Element element, /*@Nonnull*/ String formatString) { Node lastChild = element.getLastChild(); if (lastChild != null) { if (lastChild instanceof Element) { element.appendChild(document.createTextNode(formatString)); } else if (lastChild instanceof Text) { Text textNode = (Text) lastChild; String text = textNode.getWholeText(); if (hasOnlyTextSiblings(textNode)) { String trimmedText = text.trim(); if (!trimmedText.equals(text)) { textNode.replaceWholeText(trimmedText); }/*from w ww . j av a 2s .c om*/ } else { if (!formatString.equals(text)) { textNode.replaceWholeText(trimRight(text) + formatString); } } } } } public static boolean hasOnlyTextSiblings(/*@Nonnull*/ Node node) { Node leftSibling = node.getPreviousSibling(); while (leftSibling != null) { if (!(leftSibling instanceof Text)) { return false; } leftSibling = leftSibling.getPreviousSibling(); } Node rightSibling = node.getNextSibling(); while (rightSibling != null) { if (!(rightSibling instanceof Text)) { return false; } rightSibling = rightSibling.getNextSibling(); } return true; } private static String trimRight(/*@Nullable*/ String s) { if (s == null) { return null; } int lastIndex = s.length() - 1; int index = lastIndex; while (index >= 0 && s.charAt(index) <= ' ') { --index; } return index == lastIndex ? s : s.substring(0, index + 1); } }