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  package org.apache.cayenne.runtime;
  
  import org.apache.cayenne.access.DataDomain;
  import org.apache.cayenne.access.DataNode;
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.configuration.runtime.DataDomainProvider;
  import org.apache.cayenne.map.DataMap;
  
  /**
   * @since 4.0
   */
  class SyntheticNodeDataDomainProvider extends DataDomainProvider {
  
  	@Override
  	protected DataDomain createAndInitDataDomain() throws Exception {
  
  		DataDomain dataDomain = super.createAndInitDataDomain();
  
  		// no nodes... add a synthetic node... it will become the default
  		if (dataDomain.getDataNodes().isEmpty()) {
  
  			DataChannelDescriptor channelDescriptor = new DataChannelDescriptor();
  
  			DataNodeDescriptor nodeDescriptor = new DataNodeDescriptor(createSyntheticDataNodeName(dataDomain));
  
  			for (DataMap map : dataDomain.getDataMaps()) {
  				nodeDescriptor.getDataMapNames().add(map.getName());
  			}
  
  			nodeDescriptor.setDataChannelDescriptor(channelDescriptor);
  
  			DataNode node = addDataNode(dataDomain, nodeDescriptor);
  			dataDomain.setDefaultNode(node);
  		}
  		return dataDomain;
  	}
  
  	protected String createSyntheticDataNodeName(DataDomain domain) {
  
  		// using Domain's name for the node name..
  		// distinguishing nodes by name may be useful in case of multiple stacks used in the same transaction...
  
  		return domain.getName() != null ? domain.getName() : CayenneRuntimeBuilder.DEFAULT_NAME;
  	}
  
  }
  