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   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.access.sqlbuilder;
  
  import java.util.Objects;
  
  import org.apache.cayenne.access.sqlbuilder.sqltree.ColumnNode;
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  import org.apache.cayenne.access.sqlbuilder.sqltree.UnescapedColumnNode;
  import org.apache.cayenne.map.DbAttribute;
  
  /**
   * @since 4.2
   */
  public class ColumnNodeBuilder implements ExpressionTrait {
  
      private final String table;
      private final String column;
  
      private boolean unescaped;
      private String alias;
      private DbAttribute attribute;
  
      ColumnNodeBuilder(String table, String field) {
          this.table = table;
          this.column = Objects.requireNonNull(field);
      }
  
      ColumnNodeBuilder(String table, DbAttribute attribute) {
          this.table = table;
          this.column = Objects.requireNonNull(attribute).getName();
          this.attribute = attribute;
      }
  
      public ColumnNodeBuilder as(String alias) {
          this.alias = alias;
          return this;
      }
  
      public ColumnNodeBuilder unescaped() {
          this.unescaped = true;
          return this;
      }
  
      public ColumnNodeBuilder attribute(DbAttribute attribute) {
          this.attribute = attribute;
          return this;
      }
  
      public OrderingNodeBuilder desc() {
          return new OrderingNodeBuilder(this).desc();
      }
  
      public OrderingNodeBuilder asc() {
          return new OrderingNodeBuilder(this).asc();
      }
  
      @Override
      public Node build() {
          if(unescaped) {
              return new UnescapedColumnNode(table, column, alias, attribute);
          }
          return new ColumnNode(table, column, alias, attribute);
      }
  
  }
  