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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 java.util.Objects;
  
  import org.apache.cayenne.access.sqlbuilder.sqltree.JoinNode;
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  
  /**
   * @since 4.2
   */
  public class JoinNodeBuilder implements NodeBuilder {
  
      private final JoinType joinType;
      private final NodeBuilder table;
  
      private NodeBuilder joinExp;
  
      JoinNodeBuilder(JoinType joinType, NodeBuilder table) {
          this.joinType = Objects.requireNonNull(joinType);
          this.table = Objects.requireNonNull(table);
      }
  
      public JoinNodeBuilder on(NodeBuilder joinExp) {
          this.joinExp = Objects.requireNonNull(joinExp);
          return this;
      }
  
      @Override
      public Node build() {
          Node node = new JoinNode(joinType);
          node.addChild(table.build());
          node.addChild(joinExp.build());
          return node;
      }
  }
  