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  package org.apache.cayenne.project.upgrade.handlers;
  
  import java.io.File;
  import javax.xml.xpath.XPath;
  import javax.xml.xpath.XPathConstants;
  import javax.xml.xpath.XPathFactory;
  
  import org.apache.cayenne.project.upgrade.UpgradeUnit;
  import org.apache.cayenne.util.Util;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  import org.w3c.dom.Node;
  
  /**
   * @since 4.1
   */
  public class UpgradeHandler_V9 implements UpgradeHandler {
  
      private static final Logger logger = LoggerFactory.getLogger(UpgradeHandler_V9.class);
  
      @Override
      public String getVersion() {
          return "9";
      }
  
      @Override
      public void processProjectDom(UpgradeUnit upgradeUnit) {
          Element domain = upgradeUnit.getDocument().getDocumentElement();
          domain.setAttribute("project-version", getVersion());
      }
  
      @Override
      public void processDataMapDom(UpgradeUnit upgradeUnit) {
          Document document = upgradeUnit.getDocument();
          Element dataMap = document.getDocumentElement();
          updateDataMapSchemaAndVersion(upgradeUnit);
  
          XPath xpath = XPathFactory.newInstance().newXPath();
          try {
              Node reNode = (Node) xpath.evaluate("/data-map/reverse-engineering-config", document, XPathConstants.NODE);
  
              if (reNode != null) {
                  String reFileName = ((Element) reNode).getAttribute("name") + ".xml";
                  String directoryPath = Util.toFile(upgradeUnit.getResource().getURL()).getParent();
  
                  File file = new File(directoryPath + "/" + reFileName);
                  if (file.exists()) {
                      if(!file.delete()) {
                          logger.warn("Can't delete file " + file);
                      }
                  }
                  dataMap.removeChild(reNode);
              }
          } catch (Exception ex) {
              logger.warn("Can't process dataMap DOM: ", ex);
          }
      }
  }
  