ru.codeinside.gses.webui.utils.JarParseUtils.java Source code

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Here is the source code for ru.codeinside.gses.webui.utils.JarParseUtils.java

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/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 * Copyright (c) 2013, MPL CodeInside http://codeinside.ru
 */

package ru.codeinside.gses.webui.utils;

import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.util.jar.Attributes;
import java.util.jar.JarInputStream;

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

import org.apache.commons.lang.StringUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class JarParseUtils {

    public static boolean isOsgiComponent(JarInputStream jarStream) {
        Attributes mainAttributes = jarStream.getManifest().getMainAttributes();
        String serviceComponent = mainAttributes.getValue("Service-Component");
        String exportPackage = mainAttributes.getValue("Export-Package");
        String importPackage = mainAttributes.getValue("Import-Package");

        return StringUtils.isNotEmpty(serviceComponent) && StringUtils.isNotEmpty(exportPackage)
                && StringUtils.isNotEmpty(importPackage);
    }

    public static Node getChildForNlByNames(NodeList nl, String... names) {
        Node result = null;
        NodeList childNodes = nl;
        for (String name : names) {
            result = getChildForNlByName(childNodes, name);
            childNodes = result.getChildNodes();
            if (childNodes == null) {
                return null;
            }
        }
        return result;
    }

    private static Node getChildForNlByName(NodeList nl, String name) {
        for (int i = 0; i <= nl.getLength(); i++) {
            if (name.equals(nl.item(i).getLocalName())) {
                return nl.item(i);
            }
        }
        return null;
    }

    public static Document readXml(InputStream is) throws SAXException, IOException, ParserConfigurationException {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

        dbf.setValidating(false);
        dbf.setIgnoringComments(false);
        dbf.setIgnoringElementContentWhitespace(true);
        dbf.setNamespaceAware(true);
        // dbf.setCoalescing(true);
        // dbf.setExpandEntityReferences(true);

        DocumentBuilder db = dbf.newDocumentBuilder();
        db.setEntityResolver(new NullResolver());

        // db.setErrorHandler( new MyErrorHandler());

        return db.parse(is);
    }
}

class NullResolver implements EntityResolver {
    public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
        return new InputSource(new StringReader(""));
    }
}