hadoopInstaller.io.XMLDocumentReader.java Source code

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Here is the source code for hadoopInstaller.io.XMLDocumentReader.java

Source

package hadoopInstaller.io;

/*
 * #%L
 * Hadoop Installer
 * %%
 * Copyright (C) 2015 - 2016 Julin Maestri
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */

import hadoopInstaller.exception.InstallerConfigurationParseError;

import java.io.IOException;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import org.apache.commons.vfs2.FileObject;
import org.w3c.dom.Document;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

public class XMLDocumentReader {
    private static class ParseErrorHandler implements ErrorHandler {

        public ParseErrorHandler() {

        }

        @Override
        public void error(SAXParseException e) throws SAXException {
            throw e;
        }

        @Override
        public void fatalError(SAXParseException e) throws SAXException {
            throw e;
        }

        @Override
        public void warning(SAXParseException e) throws SAXException {
            throw e;
        }
    }

    public static Document parse(FileObject xmlDocument, FileObject xsdDocument)
            throws InstallerConfigurationParseError {

        try {
            // Validate against XML Schema
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            Schema schema = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI)
                    .newSchema(new StreamSource(xsdDocument.getContent().getInputStream()));
            dbf.setValidating(false);
            dbf.setSchema(schema);
            DocumentBuilder db = dbf.newDocumentBuilder();
            db.setErrorHandler(new ParseErrorHandler());
            return db.parse(xmlDocument.getContent().getInputStream());
        } catch (ParserConfigurationException | SAXException | IOException e) {
            throw new InstallerConfigurationParseError(e, "XMLDocumentReader.ParseError", xmlDocument.getName()); //$NON-NLS-1$
        }
    }
}