content: // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you 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.
  package com.cloud.hypervisor.kvm.resource;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.StringReader;
  
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  import javax.xml.transform.Transformer;
  import javax.xml.transform.TransformerException;
  import javax.xml.transform.TransformerFactory;
  import javax.xml.transform.dom.DOMSource;
  import javax.xml.transform.stream.StreamResult;
  
  import org.apache.cloudstack.utils.security.ParserUtils;
  import org.apache.logging.log4j.Logger;
  import org.apache.logging.log4j.LogManager;
  import org.w3c.dom.Document;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  import org.xml.sax.helpers.DefaultHandler;
  
  public class LibvirtXMLParser extends DefaultHandler {
      protected Logger logger = LogManager.getLogger(getClass());
      protected static final SAXParserFactory s_spf;
      static {
          s_spf = ParserUtils.getSaferSAXParserFactory();
      }
      protected SAXParser _sp;
      protected boolean _initialized = false;
  
      public LibvirtXMLParser() {
          try {
              _sp = s_spf.newSAXParser();
              _initialized = true;
          } catch (ParserConfigurationException e) {
              logger.trace("Ignoring xml parser error.", e);
          } catch (SAXException e) {
              logger.trace("Ignoring xml parser error.", e);
          }
      }
  
      public boolean parseDomainXML(String domXML) {
          if (!_initialized) {
              return false;
          }
          try {
              _sp.parse(new InputSource(new StringReader(domXML)), this);
              return true;
          } catch (SAXException se) {
              logger.warn(se.getMessage());
          } catch (IOException ie) {
              logger.error(ie.getMessage());
          }
          return false;
      }
  
      public static String getXml(Document doc) throws TransformerException {
          TransformerFactory transformerFactory = ParserUtils.getSaferTransformerFactory();
          Transformer transformer = transformerFactory.newTransformer();
  
          DOMSource source = new DOMSource(doc);
  
          ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
          StreamResult result = new StreamResult(byteArrayOutputStream);
  
          transformer.transform(source, result);
  
          return byteArrayOutputStream.toString();
      }
  
      @Override
      public void characters(char[] ch, int start, int length) throws SAXException {
      }
  
  }
  