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   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.modeler.graph.extension;
  
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.configuration.xml.DataChannelMetaData;
  import org.apache.cayenne.modeler.graph.GraphMap;
  import org.apache.cayenne.modeler.graph.GraphRegistry;
  import org.apache.cayenne.project.extension.BaseSaverDelegate;
  
  /**
   * @since 4.1
   */
  class GraphSaverDelegate extends BaseSaverDelegate {
  
      DataChannelMetaData metaData;
  
      GraphSaverDelegate(DataChannelMetaData metaData) {
          this.metaData = metaData;
      }
  
      @Override
      public Void visitDataChannelDescriptor(DataChannelDescriptor channelDescriptor) {
          GraphRegistry registry = metaData.get(channelDescriptor, GraphRegistry.class);
          if (registry == null) {
              return null;
          }
  
          if(isStandalone()) {
              printGraphs(channelDescriptor);
          } else {
              printInclude(channelDescriptor);
          }
  
          return null;
      }
  
      private void printGraphs(DataChannelDescriptor channelDescriptor) {
          GraphRegistry registry = metaData.get(channelDescriptor, GraphRegistry.class);
          GraphMap map = registry.getGraphMap(channelDescriptor);
          encoder.start("graphs")
                  .attribute("xmlns", GraphExtension.NAMESPACE)
                  .nested(map, getParentDelegate())
                  .end();
      }
  
      private void printInclude(DataChannelDescriptor channelDescriptor) {
          encoder.start("xi:include")
                  .attribute("xmlns:xi", "http://www.w3.org/2001/XInclude")
                  .attribute("href", channelDescriptor.getName() + GraphExtension.GRAPH_SUFFIX)
                  .end();
      }
  
  
  }
  