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   *  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
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  package org.apache.cayenne.configuration.xml;
  
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.configuration.DataSourceDescriptor;
  import org.xml.sax.Attributes;
  import org.xml.sax.ContentHandler;
  
  /**
   * @since 4.1
   */
  final class DataNodeChildrenHandler extends NamespaceAwareNestedTagHandler {
  
      static final String DATA_SOURCE_TAG = "data-source";
      static final String MAP_REF_TAG = "map-ref";
  
      private XMLDataChannelDescriptorLoader xmlDataChannelDescriptorLoader;
      private DataNodeDescriptor nodeDescriptor;
  
      private DataSourceDescriptor dataSourceDescriptor;
  
      DataNodeChildrenHandler(XMLDataChannelDescriptorLoader xmlDataChannelDescriptorLoader, NamespaceAwareNestedTagHandler parentHandler, DataNodeDescriptor nodeDescriptor) {
          super(parentHandler);
          this.xmlDataChannelDescriptorLoader = xmlDataChannelDescriptorLoader;
          this.nodeDescriptor = nodeDescriptor;
      }
  
      @Override
      protected boolean processElement(String namespaceURI, String localName, Attributes attributes) {
          switch (localName) {
              case MAP_REF_TAG:
                  nodeDescriptor.getDataMapNames().add(attributes.getValue("name"));
                  return true;
  
              case DATA_SOURCE_TAG:
                  nodeDescriptor.setDataSourceDescriptor(dataSourceDescriptor);
                  return true;
          }
  
          return false;
      }
  
      @Override
      protected ContentHandler createChildTagHandler(String namespaceURI, String localName,
                                                     String name, Attributes attributes) {
          if (DATA_SOURCE_TAG.equals(localName)) {
              dataSourceDescriptor = new DataSourceDescriptor();
              return new DataSourceChildrenHandler(xmlDataChannelDescriptorLoader, this, dataSourceDescriptor);
          }
  
          return super.createChildTagHandler(namespaceURI, localName, name, attributes);
      }
  }
  