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   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.access.sqlbuilder;
  
  import org.apache.cayenne.access.sqlbuilder.sqltree.CaseNode;
  import org.apache.cayenne.access.sqlbuilder.sqltree.ElseNode;
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  import org.apache.cayenne.access.sqlbuilder.sqltree.WhenNode;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import static org.apache.cayenne.access.sqlbuilder.SQLBuilder.aliased;
  
  class CaseWhenBuilder implements NodeBuilder {
  
      private final Node root;
      private final List<NodeBuilder> nodeBuilders;
      private NodeBuilder elseBuilder;
  
      public CaseWhenBuilder() {
          this.root = new CaseNode();
          this.nodeBuilders = new ArrayList<>();
      }
  
      public WhenBuilder when(NodeBuilder param) {
          nodeBuilders.add(() -> {
              WhenNode whenNode = new WhenNode();
              whenNode.addChild(param.build());
              return whenNode;
          });
          return new WhenBuilder(this);
      }
  
      public CaseWhenBuilder elseResult(NodeBuilder result) {
          elseBuilder = () -> {
              ElseNode elseNode = new ElseNode();
              elseNode.addChild(result.build());
              return elseNode;
          };
          return this;
      }
  
      public NodeBuilder as(String alias) {
          return aliased(this, alias);
      }
  
      @Override
      public Node build() {
          for (NodeBuilder builder : nodeBuilders) {
              root.addChild(builder.build());
          }
          if (elseBuilder != null){
              root.addChild(elseBuilder.build());
          }
          return root;
      }
  
      List<NodeBuilder> getNodeBuilders() {
          return nodeBuilders;
      }
  }