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  package org.apache.cayenne.modeler.graph.extension;
  
  import org.apache.cayenne.configuration.ConfigurationNodeVisitor;
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.di.Provider;
  import org.apache.cayenne.modeler.Application;
  import org.apache.cayenne.modeler.graph.GraphRegistry;
  import org.apache.cayenne.project.Project;
  import org.apache.cayenne.project.extension.BaseNamingDelegate;
  import org.apache.cayenne.project.extension.LoaderDelegate;
  import org.apache.cayenne.project.extension.ProjectExtension;
  import org.apache.cayenne.project.extension.SaverDelegate;
  
  /**
   * @since 4.1
   */
  public class GraphExtension implements ProjectExtension {
  
      static final String NAMESPACE = "http://cayenne.apache.org/schema/" + Project.VERSION + "/graph";
  
      static final String GRAPH_SUFFIX = ".graph.xml";
  
      @Inject
      protected Provider<Application> applicationProvider;
  
      @Override
      public LoaderDelegate createLoaderDelegate() {
          return new GraphLoaderDelegate(applicationProvider.get());
      }
  
      @Override
      public SaverDelegate createSaverDelegate() {
          return new GraphSaverDelegate(applicationProvider.get().getMetaData());
      }
  
      @Override
      public ConfigurationNodeVisitor<String> createNamingDelegate() {
          return new BaseNamingDelegate() {
              @Override
              public String visitDataChannelDescriptor(DataChannelDescriptor channelDescriptor) {
                  // if there is no registry, than there is no need to save anything
                  GraphRegistry registry = applicationProvider.get().getMetaData()
                          .get(channelDescriptor, GraphRegistry.class);
                  if (registry == null) {
                      return null;
                  }
                  return channelDescriptor.getName() + GRAPH_SUFFIX;
              }
          };
      }
  }
  