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  package org.apache.cayenne.access.sqlbuilder;
  
  import org.apache.cayenne.access.sqlbuilder.sqltree.FunctionNode;
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  
  /**
   * @since 4.2
   */
  public class FunctionNodeBuilder implements ExpressionTrait {
  
      private final String functionName;
      private final NodeBuilder[] args;
  
      private String alias;
  
      FunctionNodeBuilder(String functionName, NodeBuilder... args) {
          this.functionName = functionName;
          this.args = args;
      }
  
      public FunctionNodeBuilder as(String alias) {
          this.alias = alias;
          return this;
      }
  
      public OrderingNodeBuilder desc() {
          return new OrderingNodeBuilder(this).desc();
      }
  
      public OrderingNodeBuilder asc() {
          return new OrderingNodeBuilder(this).asc();
      }
  
      @Override
      public Node build() {
          Node functionNode = new FunctionNode(functionName, alias, true);
  
          for(NodeBuilder arg : args) {
              functionNode.addChild(arg.build());
          }
  
          return functionNode;
      }
  
  }
  