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.IOException;
  import java.io.StringReader;
  
  import javax.xml.parsers.DocumentBuilder;
  import javax.xml.parsers.ParserConfigurationException;
  
  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.w3c.dom.Element;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  
  public class LibvirtStorageVolumeXMLParser {
      protected Logger logger = LogManager.getLogger(getClass());
  
      public LibvirtStorageVolumeDef parseStorageVolumeXML(String volXML) {
          DocumentBuilder builder;
          try {
              builder = ParserUtils.getSaferDocumentBuilderFactory().newDocumentBuilder();
  
              InputSource is = new InputSource();
              is.setCharacterStream(new StringReader(volXML));
              Document doc = builder.parse(is);
  
              Element rootElement = doc.getDocumentElement();
  
              String VolName = getTagValue("name", rootElement);
              Element target = (Element)rootElement.getElementsByTagName("target").item(0);
              String format = getAttrValue("type", "format", target);
              Long capacity = Long.parseLong(getTagValue("capacity", rootElement));
              return new LibvirtStorageVolumeDef(VolName, capacity, LibvirtStorageVolumeDef.VolumeFormat.getFormat(format), null, null);
          } catch (ParserConfigurationException e) {
              logger.debug(e.toString());
          } catch (SAXException e) {
              logger.debug(e.toString());
          } catch (IOException e) {
              logger.debug(e.toString());
          }
          return null;
      }
  
      private static String getTagValue(String tag, Element eElement) {
          NodeList nlList = eElement.getElementsByTagName(tag).item(0).getChildNodes();
          Node nValue = nlList.item(0);
  
          return nValue.getNodeValue();
      }
  
      private static String getAttrValue(String tag, String attr, Element eElement) {
          NodeList tagNode = eElement.getElementsByTagName(tag);
          if (tagNode.getLength() == 0) {
              return null;
          }
          Element node = (Element)tagNode.item(0);
          return node.getAttribute(attr);
      }
  }
  