binaryoperator.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 33 行

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2006, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |                                         **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

// $Id: BinaryOperator.scala 5889 2006-03-05 00:33:02Z mihaylov $


package scala.dbc.statement.expression;


abstract class BinaryOperator extends Expression {
  
  /** The name of the operator. */
  def operator: String;
  
  /** The expression applied on the left of the operator. */
  def leftOperand: Expression;
  
  /** The expression applied on the right of the operator. */
  def rightOperand: Expression;
  
  /** A SQL-99 compliant string representation of the relation sub-
   * statement. This only has a meaning inside another statement. */
  def sqlInnerString: String = {
    leftOperand.sqlInnerString + " " + operator + " " + rightOperand.sqlInnerString
  }
  
}