Java XPath Expression loadNodeList(String file, String path)

Description

load Node List

License

Apache License

Declaration

public static NodeList loadNodeList(String file, String path) 

Method Source Code

//package com.java2s;
/*/*from  www .j  a  va  2  s. c  om*/
 * 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 java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

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.w3c.dom.Document;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class Main {
    public static Integer slowGetValue = 0;

    public static NodeList loadNodeList(String file, String path) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder;
            builder = factory.newDocumentBuilder();
            Document doc = builder.parse(file);

            return getDocNodeList(doc, path);
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            System.out.println("ERROR: your xml file " + file + " is not well-formed");
            // e.printStackTrace();         
        } catch (IOException e) {
            System.out.println("ERROR: input file " + file + " not found");
            // e.printStackTrace();
        }

        return null;
    }

    public static NodeList getDocNodeList(Document xmlDoc, String path) {
        // NodeList list = (NodeList) expr.evaluate(xmlDoc, XPathConstants.NODESET);
        return getNodeList(xmlDoc, path);
    }

    public static NodeList getNodeList(Node node, String path) {
        try {
            slowGetValue++;
            // System.out.println("slow : " + slowGetValue + " - " + path);

            XPathFactory xPathFactory = XPathFactory.newInstance();
            XPath xpath = xPathFactory.newXPath();
            XPathExpression expr;
            expr = xpath.compile(path);
            NodeList list = (NodeList) expr.evaluate(node, XPathConstants.NODESET);

            return list;
        } catch (XPathExpressionException e) {
            e.printStackTrace();
        }
        return null;
    }
}

Related

1. hasAnimatedPng(ImageReader reader)
2. isLegalXPath(final String xPath)
3. isValidFilter(String xPathString)
4. isXPathAbsolute(String path)
5. loadFromXmlNode(String xmlFile, String prefix)
6. merge(XPathExpression expression, InputStream... files)
7. modelPathExpr()
8. parseXMLValue(String xml, String xpathExpression)
9. parseXPath(String expression, NamespaceContext nsContext)