com.twitter.bijection.NumericBijections.scala Maven / Gradle / Ivy

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/*
Copyright 2012 Twitter, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 */

package com.twitter.bijection

import java.lang.{
  Short => JShort,
  Integer => JInt,
  Long => JLong,
  Float => JFloat,
  Double => JDouble,
  Byte => JByte
}

import java.math.BigInteger
import java.util.UUID

trait NumericBijections extends GeneratedTupleBijections {

  /**
    * Bijections between the numeric types and their java versions.
    */
  implicit val byte2Boxed: Bijection[Byte, JByte] =
    new AbstractBijection[Byte, JByte] {
      def apply(b: Byte) = JByte.valueOf(b)
      override def invert(b: JByte) = b.byteValue
    }

  implicit val short2Boxed: Bijection[Short, JShort] =
    new AbstractBijection[Short, JShort] {
      def apply(s: Short) = JShort.valueOf(s)
      override def invert(s: JShort) = s.shortValue
    }

  implicit val short2ByteByte: Bijection[Short, (Byte, Byte)] =
    new AbstractBijection[Short, (Byte, Byte)] {
      def apply(l: Short) = ((l >>> 8).toByte, l.toByte)
      override def invert(tup: (Byte, Byte)) = {
        val lowbits = tup._2.toInt & 0xff
        (((tup._1 << 8) | lowbits)).toShort
      }
    }

  implicit val int2Boxed: Bijection[Int, JInt] =
    new AbstractBijection[Int, JInt] {
      def apply(i: Int) = JInt.valueOf(i)
      override def invert(i: JInt) = i.intValue
    }

  implicit val int2ShortShort: Bijection[Int, (Short, Short)] =
    new AbstractBijection[Int, (Short, Short)] {
      def apply(l: Int) = ((l >>> 16).toShort, l.toShort)
      override def invert(tup: (Short, Short)) =
        ((tup._1.toInt << 16) | ((tup._2.toInt << 16) >>> 16))
    }

  implicit val long2Boxed: Bijection[Long, JLong] =
    new AbstractBijection[Long, JLong] {
      def apply(l: Long) = JLong.valueOf(l)
      override def invert(l: JLong) = l.longValue
    }

  implicit val long2IntInt: Bijection[Long, (Int, Int)] =
    new AbstractBijection[Long, (Int, Int)] {
      def apply(l: Long) = ((l >>> 32).toInt, l.toInt)
      override def invert(tup: (Int, Int)) =
        ((tup._1.toLong << 32) | ((tup._2.toLong << 32) >>> 32))
    }

  implicit val float2Boxed: Bijection[Float, JFloat] =
    new AbstractBijection[Float, JFloat] {
      def apply(f: Float) = JFloat.valueOf(f)
      override def invert(f: JFloat) = f.floatValue
    }

  implicit val double2Boxed: Bijection[Double, JDouble] =
    new AbstractBijection[Double, JDouble] {
      def apply(d: Double) = JDouble.valueOf(d)
      override def invert(d: JDouble) = d.doubleValue
    }

  val float2IntIEEE754: Bijection[Float, Int] =
    new AbstractBijection[Float, Int] {
      def apply(f: Float) = JFloat.floatToIntBits(f)
      override def invert(i: Int) = JFloat.intBitsToFloat(i)
    }

  val double2LongIEEE754: Bijection[Double, Long] =
    new AbstractBijection[Double, Long] {
      def apply(d: Double) = JDouble.doubleToLongBits(d)
      override def invert(l: Long) = JDouble.longBitsToDouble(l)
    }

  implicit val bigInt2BigInteger: Bijection[BigInt, BigInteger] =
    new AbstractBijection[BigInt, BigInteger] {
      def apply(bi: BigInt) = bi.bigInteger
      override def invert(jbi: BigInteger) = new BigInt(jbi)
    }

  /* Other types to and from Numeric types */
  implicit val uid2LongLong: Bijection[UUID, (Long, Long)] =
    new AbstractBijection[UUID, (Long, Long)] { uid =>
      def apply(uid: UUID) =
        (uid.getMostSignificantBits, uid.getLeastSignificantBits)
      override def invert(ml: (Long, Long)) = new UUID(ml._1, ml._2)
    }

  implicit val date2Long: Bijection[java.util.Date, Long] =
    new AbstractBijection[java.util.Date, Long] {
      def apply(d: java.util.Date) = d.getTime
      override def invert(l: Long) = new java.util.Date(l)
    }
}