org.scalatest.InsertionOrderSet.scala Maven / Gradle / Ivy
/*
* Copyright 2001-2016 Artima, 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 org.scalatest
private[scalatest] class InsertionOrderSet[A](elements: List[A]) extends Set[A] {
val list = elements.distinct
def contains(key: A): Boolean = list.contains(key)
def iterator: Iterator[A] = list.iterator
def +(elem: A) = InsertionOrderSet[A](list :+ elem)
def -(elem: A) = InsertionOrderSet[A](list.filter(_ != elem))
}
private[scalatest] object InsertionOrderSet {
def apply[A](elements: List[A]): InsertionOrderSet[A] = new InsertionOrderSet(elements)
}