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 java.util.ArrayList;
  
  import org.xml.sax.Attributes;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  
  public class LibvirtCapXMLParser extends LibvirtXMLParser {
      private boolean _host = false;
      private boolean _guest = false;
      private boolean _osType = false;
      private boolean _domainTypeKVM = false;
      private boolean _emulatorFlag = false;
      private boolean _archTypex8664 = false;
      private final StringBuffer _emulator = new StringBuffer();
      private final StringBuffer _capXML = new StringBuffer();
      private final ArrayList<String> guestOsTypes = new ArrayList<String>();
  
      @Override
      public void endElement(String uri, String localName, String qName) throws SAXException {
          if (qName.equalsIgnoreCase("host")) {
              _host = false;
          } else if (qName.equalsIgnoreCase("os_type")) {
              _osType = false;
          } else if (qName.equalsIgnoreCase("guest")) {
              _guest = false;
          } else if (qName.equalsIgnoreCase("domain")) {
              _domainTypeKVM = false;
          } else if (qName.equalsIgnoreCase("emulator")) {
              _emulatorFlag = false;
          } else if (qName.equalsIgnoreCase("arch")) {
              _archTypex8664 = false;
          } else if (_host) {
              _capXML.append("<").append("/").append(qName).append(">");
          }
      }
  
      @Override
      public void characters(char[] ch, int start, int length) throws SAXException {
          if (_host) {
              _capXML.append(ch, start, length);
          } else if (_osType) {
              guestOsTypes.add(new String(ch, start, length));
          } else if (_emulatorFlag) {
              logger.debug("Found " + new String(ch, start, length) + " as a suiteable emulator");
              _emulator.append(ch, start, length);
          }
      }
  
      @Override
      public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
          if (qName.equalsIgnoreCase("host")) {
              _host = true;
          } else if (qName.equalsIgnoreCase("guest")) {
              _guest = true;
          } else if (qName.equalsIgnoreCase("os_type")) {
              if (_guest) {
                  _osType = true;
              }
          } else if (qName.equalsIgnoreCase("arch")) {
              for (int i = 0; i < attributes.getLength(); i++) {
                  if (attributes.getQName(i).equalsIgnoreCase("name") &&
                          (attributes.getValue(i).equalsIgnoreCase("x86_64") || attributes.getValue(i).equalsIgnoreCase("aarch64"))) {
                      _archTypex8664 = true;
                  }
              }
          } else if (qName.equalsIgnoreCase("domain")) {
              for (int i = 0; i < attributes.getLength(); i++) {
                  if (attributes.getQName(i).equalsIgnoreCase("type") && attributes.getValue(i).equalsIgnoreCase("kvm")) {
                      _domainTypeKVM = true;
                  }
              }
          } else if (qName.equalsIgnoreCase("emulator") && _domainTypeKVM && _archTypex8664) {
              _emulatorFlag = true;
              _emulator.delete(0, _emulator.length());
          } else if (_host) {
              _capXML.append("<").append(qName);
              for (int i = 0; i < attributes.getLength(); i++) {
                  _capXML.append(" ").append(attributes.getQName(i)).append("=").append(attributes.getValue(i));
              }
              _capXML.append(">");
          }
  
      }
  
      public String parseCapabilitiesXML(String capXML) {
          if (!_initialized) {
              return null;
          }
          try {
              _sp.parse(new InputSource(new StringReader(capXML)), this);
              return _capXML.toString();
          } catch (SAXException se) {
              logger.warn(se.getMessage());
          } catch (IOException ie) {
              logger.error(ie.getMessage());
          }
          return null;
      }
  
      public ArrayList<String> getGuestOsType() {
          return guestOsTypes;
      }
  
      public String getEmulator() {
          return _emulator.toString();
      }
  
  }
  