Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2010-2012 by Min Cai (min.cai.china@gmail.com).
 *
 * This file is part of the PickaPack library.
 *
 * PickaPack is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PickaPack 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with PickaPack. If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.namespace.QName;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import java.util.ArrayList;
import java.util.List;

public class Main {
    private static XPath xpath = XPathFactory.newInstance().newXPath();

    /**
     * Get the list of nodes from the specified object using the specified XPath expression.
     *
     * @param obj the object
     * @param xpathExpression the XPath expression
     * @return the list of nodes from the specified object matched using the specified XPath expression.
     */
    public static List<Node> getByXPath(Object obj, String xpathExpression) {
        NodeList list1 = evaluate(obj, xpathExpression, XPathConstants.NODESET);

        List<Node> nodes = new ArrayList<Node>();
        for (int i = 0; i < list1.getLength(); i++) {
            nodes.add(list1.item(i));
        }

        return nodes;
    }

    @SuppressWarnings("unchecked")
    private static <T> T evaluate(Object obj, String xpathExpression, QName qName) {
        try {
            return (T) xpath.compile(xpathExpression).evaluate(obj, qName);
        } catch (XPathExpressionException e) {
            throw new RuntimeException(e);
        }
    }
}