org.scalatest.enablers.Size.scala Maven / Gradle / Ivy
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/*
* Copyright 2001-2013 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.enablers
/**
* Supertrait for Size typeclasses.
*
*
* Trait Size is a typeclass trait for objects that can be queried for size.
* Objects of type T for which an implicit Size[T] is available can be used
* with the should have size syntax.
* In other words, this trait enables you to use the size checking
* syntax with arbitrary objects. As an example, the following Bridge class:
*
*
*
* scala> import org.scalatest._
* import org.scalatest._
*
* scala> import enablers.Size
* import enablers.Size
*
* scala> import Matchers._
* import Matchers._
*
* scala> case class Bridge(span: Int)
* defined class Bridge
*
*
*
* Out of the box you can't use the should have size syntax with Bridge,
* because ScalaTest doesn't know that a bridge's span means its size:
*
*
*
* scala> val bridge = new Bridge(2000)
* bridge: Bridge = Bridge(2000)
*
* scala> bridge should have size 2000
* <console>:34: error: could not find implicit value for
* parameter sz: org.scalatest.enablers.Size[Bridge]
* bridge should have size 2000
* ^
*
*
*
* You can teach this to ScalaTest, however, by defining an implicit Size[Bridge].
*
*
*
* scala> implicit val sizeOfBridge: Size[Bridge] =
* | new Size[Bridge] {
* | def sizeOf(b: Bridge): Long = b.span
* | }
* sizeOfBridge: org.scalatest.enablers.Size[Bridge] = $anon$1@3fa27a4a
*
*
*
* With the implicit Size[Bridge] in scope, you can now use ScalaTest's should have size
* syntax with Bridge instances:
*
*
*
* scala> bridge should have size 2000
* res4: org.scalatest.Assertion = Succeeded
*
* scala> bridge should have size 2001
* org.scalatest.exceptions.TestFailedException: Bridge(2000) had size 2000 instead of expected size 2001
* at org.scalatest.MatchersHelper$.newTestFailedException(MatchersHelper.scala:148)
* at org.scalatest.MatchersHelper$.indicateFailure(MatchersHelper.scala:366)
* at org.scalatest.Matchers$ResultOfHaveWordForExtent.size(Matchers.scala:2720)
* ... 43 elided
*
*
* @author Bill Venners
*/
trait Size[T] {
/**
* Returns the size of the passed object.
*
* @param obj the object whose size to return
* @return the size of the passed object
*/
def sizeOf(obj: T): Long
}
/**
* Companion object for Size that provides implicit implementations for the following types:
*
*
* scala.collection.GenTraversableStringArrayjava.util.Collectionjava.util.Map- arbitary object with a
size() method that returns Int
* - arbitary object with a parameterless
size method that returns Int
* - arbitary object with a
getSize() method that returns Int
* - arbitary object with a parameterless
getSize method that returns Int
* - arbitary object with a
size() method that returns Long
* - arbitary object with a parameterless
size method that returns Long
* - arbitary object with a
getSize() method that returns Long
* - arbitary object with a parameterless
getSize method that returns Long
*
*/
object Size {
/**
* Enable Size implementation for java.util.Collection
*
* @tparam JCOL any subtype of java.util.Collection
* @return Size[JCOL] that supports java.util.Collection in have size syntax
*/
implicit def sizeOfJavaCollection[JCOL <: java.util.Collection[_]]: Size[JCOL] =
new Size[JCOL] {
def sizeOf(javaColl: JCOL): Long = javaColl.size
}
/**
* Enable Size implementation for java.util.Map
*
* @tparam JMAP any subtype of java.util.Map
* @return Size[JMAP] that supports java.util.Map in have size syntax
*/
implicit def sizeOfJavaMap[JMAP <: java.util.Map[_, _]]: Size[JMAP] =
new Size[JMAP] {
def sizeOf(javaMap: JMAP): Long = javaMap.size
}
/**
* Enable Size implementation for scala.collection.GenTraversable
*
* @tparam TRAV any subtype of scala.collection.GenTraversable
* @return Size[TRAV] that supports scala.collection.GenTraversable in have size syntax
*/
implicit def sizeOfGenTraversable[TRAV <: scala.collection.GenTraversable[_]]: Size[TRAV] =
new Size[TRAV] {
def sizeOf(trav: TRAV): Long = trav.size
}
/**
* Enable Size implementation for Array
*
* @tparam E the type of the element in the Array
* @return Size[Array[E]] that supports Array in have size syntax
*/
implicit def sizeOfArray[E]: Size[Array[E]] =
new Size[Array[E]] {
def sizeOf(arr: Array[E]): Long = arr.length
}
/**
* Enable Size implementation for String
*
* @return Size[String] that supports String in have size syntax
*/
implicit val sizeOfString: Size[String] =
new Size[String] {
def sizeOf(str: String): Long = str.length
}
import scala.language.reflectiveCalls
/**
* Enable Size implementation for arbitary object with size() method that returns Int.
*
* @tparam T any type with size() method that returns Int
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithSizeMethodForInt[T <: AnyRef { def size(): Int}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.size
}
/**
* Enable Size implementation for arbitary object with parameterless size method that returns Int.
*
* @tparam T any type with parameterless size method that returns Int
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithParameterlessSizeMethodForInt[T <: AnyRef { def size: Int}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.size
}
/**
* Enable Size implementation for arbitary object with getSize() method that returns Int.
*
* @tparam T any type with getSize() method that returns Int
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithGetSizeMethodForInt[T <: AnyRef { def getSize(): Int}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.getSize
}
/**
* Enable Size implementation for arbitary object with parameterless getSize method that returns Int.
*
* @tparam T any type with parameterless getSize method that returns Int
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithParameterlessGetSizeMethodForInt[T <: AnyRef { def getSize: Int}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.getSize
}
/**
* Enable Size implementation for arbitary object with size() method that returns Long.
*
* @tparam T any type with size() method that returns Long
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithSizeMethodForLong[T <: AnyRef { def size(): Long}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.size
}
/**
* Enable Size implementation for arbitary object with parameterless size method that returns Long.
*
* @tparam T any type with parameterless size method that returns Long
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithParameterlessSizeMethodForLong[T <: AnyRef { def size: Long}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.size
}
/**
* Enable Size implementation for arbitary object with getSize() method that returns Long.
*
* @tparam T any type with getSize() method that returns Long
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithGetSizeMethodForLong[T <: AnyRef { def getSize(): Long}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.getSize
}
/**
* Enable Size implementation for arbitary object with getSize method that returns Long.
*
* @tparam T any type with getSize method that returns Long
* @return Size[T] that supports T in have size syntax
*/
implicit def sizeOfAnyRefWithParameterlessGetSizeMethodForLong[T <: AnyRef { def getSize: Long}]: Size[T] =
new Size[T] {
def sizeOf(obj: T): Long = obj.getSize
}
}
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