Java tutorial
//package com.java2s; /* * Copyright (c) 2013, University of Toronto. * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. You may obtain * a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. */ import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; public class Main { static boolean debug = true; private static Document pruneDocument(Document doc, int maxElement) throws ParserConfigurationException { if (maxElement == -1) { return doc; } Document newDoc = (Document) doc.cloneNode(false); Element newRoot = (Element) doc.getDocumentElement().cloneNode(false); newDoc.adoptNode(newRoot); newDoc.appendChild(newRoot); NodeList nl = doc.getDocumentElement().getChildNodes(); for (int i = 0; i < maxElement && i < nl.getLength(); i++) { if (!(nl.item(i) instanceof Element)) { maxElement++; continue; } Node item = nl.item(i).cloneNode(true); newDoc.adoptNode(item); newDoc.getDocumentElement().appendChild(item); } if (debug) System.out.println("Creating document of " + newDoc.getDocumentElement().getChildNodes().getLength()); return newDoc; } }