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  package org.apache.cayenne.project.compatibility;
  
  import java.util.List;
  
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.project.upgrade.DefaultUpgradeService;
  import org.apache.cayenne.project.upgrade.UpgradeUnit;
  import org.apache.cayenne.project.upgrade.handlers.UpgradeHandler;
  import org.apache.cayenne.resource.Resource;
  import org.apache.cayenne.util.Util;
  import org.w3c.dom.Document;
  
  /**
   * @since 4.1
   */
  public class CompatibilityUpgradeService extends DefaultUpgradeService {
  
      @Inject
      DocumentProvider documentProvider;
  
      public CompatibilityUpgradeService(@Inject List<UpgradeHandler> handlerList) {
          super(handlerList);
      }
  
      @Override
      public Resource upgradeProject(Resource resource) {
          List<UpgradeHandler> handlerList = getHandlersForVersion(loadProjectVersion(resource));
          List<UpgradeUnit> upgradeUnits = upgradeDOM(resource, handlerList);
  
          for(UpgradeUnit unit : upgradeUnits) {
              documentProvider.putDocument(unit.getResource().getURL(), unit.getDocument());
          }
  
          return resource;
      }
  
      public Resource upgradeDataMap(Resource resource) {
          List<UpgradeHandler> handlerList = getHandlersForVersion(loadProjectVersion(resource));
          Document document =  Util.readDocument(resource.getURL());
          UpgradeUnit upgradeUnit = new UpgradeUnit(resource, document);
          for(UpgradeHandler handler : handlerList) {
              handler.processDataMapDom(upgradeUnit);
          }
          documentProvider.putDocument(upgradeUnit.getResource().getURL(), upgradeUnit.getDocument());
          return upgradeUnit.getResource();
      }
  
      public void upgradeModel(Resource resource, DataChannelDescriptor descriptor) {
          List<UpgradeHandler> handlerList = getHandlersForVersion(loadProjectVersion(resource));
          for(UpgradeHandler handler : handlerList) {
              handler.processModel(descriptor);
          }
      }
  
  }
  