org.mashupmedia.util.XmlHelper.java Source code

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Here is the source code for org.mashupmedia.util.XmlHelper.java

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/*
 *  This file is part of MashupMedia.
 *
 *  MashupMedia 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.
 *
 *  MashupMedia 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 MashupMedia.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.mashupmedia.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.apache.commons.lang3.StringUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class XmlHelper {

    private static DocumentBuilderFactory documentBuilderFactory;

    private static XPathFactory xPathFactory;

    public static DocumentBuilderFactory getDocumentBuilderFactory() {
        if (documentBuilderFactory != null) {
            return documentBuilderFactory;
        }

        documentBuilderFactory = DocumentBuilderFactory.newInstance();
        return documentBuilderFactory;
    }

    public static XPathFactory getxPathFactory() {
        if (xPathFactory != null) {
            return xPathFactory;
        }

        xPathFactory = XPathFactory.newInstance();
        return xPathFactory;
    }

    public static void skipElements(XMLStreamReader reader, Integer... elements) throws XMLStreamException {
        int eventType = reader.getEventType();
        List<Integer> types = Arrays.asList(elements);
        while (types.contains(eventType)) {
            eventType = reader.next();
        }
    }

    public static Document createDocument(InputStream inputStream)
            throws ParserConfigurationException, SAXException, IOException {
        DocumentBuilder builder = getDocumentBuilderFactory().newDocumentBuilder();
        Document document = builder.parse(inputStream);
        return document;
    }

    public static String getTextFromElement(Document document, String expression) throws XPathExpressionException {
        XPath xPath = getxPathFactory().newXPath();
        XPathExpression xPathExpression = xPath.compile(expression);
        String value = (String) xPathExpression.evaluate(document, XPathConstants.STRING);
        value = StringUtils.trimToEmpty(value);
        return value;
    }

    public static NodeList getNodeListFromElement(Document document, String expression)
            throws XPathExpressionException {
        XPath xPath = getxPathFactory().newXPath();
        XPathExpression xPathExpression = xPath.compile(expression);
        NodeList nodeList = (NodeList) xPathExpression.evaluate(document, XPathConstants.NODESET);
        return nodeList;
    }

    public static String getTextContentFromNodeName(NodeList nodeList, String nodeName) {
        nodeName = StringUtils.trimToEmpty(nodeName);
        if (nodeList == null || StringUtils.isEmpty(nodeName)) {
            return "";
        }

        for (int i = 0; i < nodeList.getLength(); i++) {
            Node node = nodeList.item(i);
            if (nodeName.equalsIgnoreCase(node.getNodeName())) {
                String text = node.getTextContent();
                text = StringUtils.trimToEmpty(text);
                return text;
            }
        }

        return "";
    }

}