Java XPath Get getScrProperties(String componentName)

Description

get Scr Properties

License

Open Source License

Declaration

public static Map<String, String> getScrProperties(String componentName)
            throws Exception 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.*;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class Main {
    public static Map<String, String> getScrProperties(String componentName)
            throws Exception {
        return getScrProperties(String.format(
                "target/classes/OSGI-INF/%s.xml", componentName),
                componentName);//from www . j  a  va  2 s.  c  o m
    }

    public static Map<String, String> getScrProperties(String xmlLocation,
            String componentName) throws Exception {
        Map<String, String> result = new HashMap<>();
        final Document dom = readXML(new File(xmlLocation));
        final XPath xPath = XPathFactory.newInstance(
                XPathFactory.DEFAULT_OBJECT_MODEL_URI,
                "com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl",
                null).newXPath();
        xPath.setNamespaceContext(new NamespaceContext() {
            @Override
            public String getNamespaceURI(String prefix) {
                switch (prefix) {
                case "scr":
                    try {
                        XPathExpression scrNamespace = xPath
                                .compile("/*/namespace::*[name()='scr']");
                        Node node = (Node) scrNamespace.evaluate(dom,
                                XPathConstants.NODE);
                        return node.getNodeValue();
                    } catch (XPathExpressionException e) {
                        e.printStackTrace();
                    }
                    return "http://www.osgi.org/xmlns/scr/v1.1.0";
                }
                return XMLConstants.NULL_NS_URI;
            }

            @Override
            public String getPrefix(String namespaceURI) {
                return null;
            }

            @Override
            public Iterator getPrefixes(String namespaceURI) {
                return null;
            }
        });
        String propertyListExpression = String.format(
                "/components/scr:component[@name='%s']/property",
                componentName);
        XPathExpression propertyList = xPath
                .compile(propertyListExpression);
        XPathExpression propertyName = xPath.compile("@name");
        XPathExpression propertyValue = xPath.compile("@value");
        NodeList nodes = (NodeList) propertyList.evaluate(dom,
                XPathConstants.NODESET);
        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.item(i);
            result.put((String) propertyName.evaluate(node,
                    XPathConstants.STRING), (String) propertyValue
                    .evaluate(node, XPathConstants.STRING));
        }
        return result;
    }

    private static Document readXML(File xml)
            throws ParserConfigurationException, SAXException, IOException {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory
                .newInstance();
        builderFactory.setNamespaceAware(true);
        DocumentBuilder builder = builderFactory.newDocumentBuilder();
        return builder.parse(xml);
    }
}

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