Here you can find the source of xpathOrNull(Document doc, String xp)
Parameter | Description |
---|---|
doc | Document |
xp | XPath to evaluate against Document |
public static String xpathOrNull(Document doc, String xp)
//package com.java2s; /* XmlUtils/*ww w . j ava 2s. c o m*/ * * Created on Sep 19, 2007 * * Copyright (C) 2007 Internet Archive. * * This file is part of the Heritrix web crawler (crawler.archive.org). * * Heritrix is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * any later version. * * Heritrix is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser Public License for more details. * * You should have received a copy of the GNU Lesser Public License * along with Heritrix; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ import javax.xml.xpath.XPath; import javax.xml.xpath.XPathExpression; import javax.xml.xpath.XPathExpressionException; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Document; public class Main { /** * Evaluate an XPath against a Document, returning a String. * * @param doc Document * @param xp XPath to evaluate against Document * @return String found at path or null */ public static String xpathOrNull(Document doc, String xp) { XPathFactory factory = XPathFactory.newInstance(); XPath xpath = factory.newXPath(); try { XPathExpression expr = xpath.compile(xp); return expr.evaluate(doc); } catch (XPathExpressionException e) { return null; } } }