borachio-core_2.9.0-1.1.5.source-code.MatchEpsilon.scala Maven / Gradle / Ivy

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// Copyright (c) 2011 Paul Butcher
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package com.borachio

import scala.math.abs

class MatchEpsilon(value: Double) extends Equals {

  override def canEqual(that: Any) = that.isInstanceOf[Number]

  override def equals(that: Any) = that match {
    case n: Number => abs(value - n.doubleValue) < MatchEpsilon.epsilon
    case _ => false
  }
  
  override def toString = "~"+ value
}

object MatchEpsilon {
  
  val epsilon = 0.001
}