Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/* XmlUtils
 *
 * 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;
        }
    }
}