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Scala example source code file (ApproximateNumeric.scala)

This example Scala source code file (ApproximateNumeric.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

approximatenumeric, approximatenumeric, datatype, double, double, float, precision, real, sql-99, sql-99, tuple2, tuple2

The Scala ApproximateNumeric.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |                                         **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.dbc
package datatype;


/** A type category for all SQL types that store varying-precision
 * numbers.
 */
@deprecated(DbcIsDeprecated, "2.9.0") abstract class ApproximateNumeric[Type] (
  override val nativeTypeId: DataType.Id
) extends datatype.Numeric[Type](nativeTypeId) {

  def isEquivalent(datatype: DataType) = datatype match {
    case dt: ApproximateNumeric[_] =>
      (nativeTypeId == dt.nativeTypeId &&
       precisionRadix == dt.precisionRadix &&
       precision == dt.precision &&
       signed == dt.signed)
    case _ =>
      false
  }

  def isSubtypeOf (datatype:DataType) = datatype match {
    case dt:ApproximateNumeric[_] =>
      (nativeTypeId == dt.nativeTypeId &&
       precisionRadix == dt.precisionRadix &&
       precision <= dt.precision &&
       signed == dt.signed)
    case _ =>
      false
  }

  /** A SQL-99 compliant string representation of the type.
   *  <h3>Compatibility notice This method assumes that a real
   *  uses 32 bits and a double 64. This is not defined in the
   *  standard but is usually the case.
   */
  override def sqlString: java.lang.String = Tuple2(precisionRadix,precision) match {
    case Tuple2(2,64) => "REAL"
    case Tuple2(2,128) => "DOUBLE PRECISION"
    case Tuple2(2,p) =>
      throw exception.UnsupportedFeature("SQL-99 does not support an approximate numeric type with a binary defined precision other than 16, 32 and 64 bits");
    case Tuple2(10,p) => "FLOAT (" + p.toString() + ")"
    case Tuple2(pr,_) =>
      throw exception.UnsupportedFeature("SQL-99 does not support the precision of an approximate numeric type to be defined in a radix other than 2 or 10");
  }

}

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