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  package org.apache.cayenne.access.sqlbuilder;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  import org.apache.cayenne.access.sqlbuilder.sqltree.ThenNode;
  
  /**
   * @since 5.0
   */
  class WhenBuilder implements NodeBuilder {
  
      NodeBuilder result;
      CaseWhenBuilder builder;
  
      public WhenBuilder(CaseWhenBuilder caseWhenBuilder) {
          this.builder = caseWhenBuilder;
      }
  
      CaseWhenBuilder then(NodeBuilder result) {
          this.result = result;
          builder.getNodeBuilders().add(this);
          return builder;
      }
      @Override
      public Node build() {
          if(result == null) {
              throw new CayenneRuntimeException("\"Then\" result must be defined after the \"When\" condition ");
          }
          ThenNode thenNode = new ThenNode();
          thenNode.addChild(result.build());
          return thenNode;
      }
  }