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JAVA-911 Need to move existing scala code from java to scala repository

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catalin-burcea 2020-03-14 22:07:49 +02:00
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2
.gitignore vendored
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@ -73,8 +73,6 @@ ninja/devDb.mv.db
**/out-tsc **/out-tsc
**/nbproject/ **/nbproject/
**/nb-configuration.xml **/nb-configuration.xml
core-scala/.cache-main
core-scala/.cache-tests
persistence-modules/hibernate5/transaction.log persistence-modules/hibernate5/transaction.log

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core-scala/README.md
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## Core Scala
This module contains articles about Scala's core features
### Relevant Articles:
- [Introduction to Scala](https://www.baeldung.com/scala-intro)
- [Regular Expressions in Scala](https://www.baeldung.com/scala/regular-expressions)

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core-scala/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-scala</artifactId>
<version>1.0-SNAPSHOT</version>
<name>core-scala</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>${scala.plugin.version}</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
<configuration>
<args>
<arg>-dependencyfile</arg>
<arg>${project.build.directory}/.scala_dependencies</arg>
</args>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<properties>
<scala.version>2.12.7</scala.version>
<scala.plugin.version>3.3.2</scala.plugin.version>
</properties>
</project>

44
core-scala/src/main/scala/com/baeldung/scala/ControlStructuresDemo.scala
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package com.baeldung.scala
/**
* Sample code demonstrating the various control structured.
*
* @author Chandra Prakash
*
*/
object ControlStructuresDemo {
def gcd(x : Int, y : Int) : Int = {
if (y == 0) x else gcd(y, x % y)
}
def gcdIter(x : Int, y : Int) : Int = {
var a = x
var b = y
while (b > 0) {
a = a % b
val t = a
a = b
b = t
}
a
}
def rangeSum(a : Int, b : Int) = {
var sum = 0;
for (i <- a to b) {
sum += i
}
sum
}
def factorial(a : Int) : Int = {
var result = 1;
var i = 1;
do {
result *= i
i = i + 1
} while (i <= a)
result
}
}

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core-scala/src/main/scala/com/baeldung/scala/Employee.scala
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package com.baeldung.scala
/**
* Sample Code demonstrating a class.
*
* @author Chandra Prakash
*
*/
class Employee(val name : String,
var salary : Int,
annualIncrement : Int = 20) {
def incrementSalary() : Unit = {
salary += annualIncrement
}
override def toString =
s"Employee(name=$name, salary=$salary)"
}
/**
* A Trait which will make the toString return upper case value.
*/
trait UpperCasePrinter {
override def toString: String = super.toString toUpperCase
}

6
core-scala/src/main/scala/com/baeldung/scala/HelloWorld.scala
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package com.baeldung.scala
object HelloWorld extends App {
println("Hello World!")
args foreach println
}

27
core-scala/src/main/scala/com/baeldung/scala/HigherOrderFunctions.scala
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package com.baeldung.scala
/**
* Sample higher order functions.
*
* @author Chandra Prakash
*
*/
object HigherOrderFunctions {
def mapReduce(r : (Int, Int) => Int,
i : Int,
m : Int => Int,
a : Int, b : Int): Int = {
def iter(a : Int, result : Int) : Int = {
if (a > b) result
else iter(a + 1, r(m(a), result))
}
iter(a, i)
}
def whileLoop(condition : => Boolean)(body : => Unit) : Unit =
if (condition) {
body
whileLoop(condition)(body)
}
}

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core-scala/src/main/scala/com/baeldung/scala/IntSet.scala
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package com.baeldung.scala
/**
* An abstract class for set of integers and its implementation.
*
* @author Chandra Prakash
*
*/
abstract class IntSet {
// add an element to the set
def incl(x : Int) : IntSet
// whether an element belongs to the set
def contains(x : Int) : Boolean
}
class EmptyIntSet extends IntSet {
def contains(x : Int) : Boolean = false
def incl(x : Int) =
new NonEmptyIntSet(x, this)
}
class NonEmptyIntSet(val head : Int, val tail : IntSet)
extends IntSet {
def contains(x : Int) : Boolean =
head == x || (tail contains x)
def incl(x : Int) : IntSet =
if (this contains x) this
else new NonEmptyIntSet(x, this)
}

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core-scala/src/main/scala/com/baeldung/scala/PatternMatching.scala
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@ -1,137 +0,0 @@
package com.baeldung.scala
// Case Class
abstract class Animal
case class Mammal(name: String, fromSea: Boolean) extends Animal
case class Bird(name: String) extends Animal
case class Fish(name: String) extends Animal
// Sealed Class
sealed abstract class CardSuit
case class Spike() extends CardSuit
case class Diamond() extends CardSuit
case class Heart() extends CardSuit
case class Club() extends CardSuit
object Person {
def apply(fullName: String) = fullName
def unapply(fullName: String): Option[String] = {
if (!fullName.isEmpty)
Some(fullName.replaceAll("(?<=\\w)(\\w+)", "."))
else
None
}
}
class PatternMatching {
def caseClassesPatternMatching(animal: Animal): String = {
animal match {
case Mammal(name, fromSea) => s"I'm a $name, a kind of mammal. Am I from the sea? $fromSea"
case Bird(name) => s"I'm a $name, a kind of bird"
case _ => "I'm an unknown animal"
}
}
def constantsPatternMatching(constant: Any): String = {
constant match {
case 0 => "I'm equal to zero"
case 4.5d => "I'm a double"
case false => "I'm the contrary of true"
case _ => s"I'm unknown and equal to $constant"
}
}
def sequencesPatternMatching(sequence: Any): String = {
sequence match {
case List(singleElement) => s"I'm a list with one element: $singleElement"
case List(_, _*) => s"I'm a list with one or multiple elements: $sequence"
case Vector(1, 2, _*) => s"I'm a vector: $sequence"
case _ => s"I'm an unrecognized sequence. My value: $sequence"
}
}
def tuplesPatternMatching(tuple: Any): String = {
tuple match {
case (first, second) => s"I'm a tuple with two elements: $first & $second"
case (first, second, third) => s"I'm a tuple with three elements: $first & $second & $third"
case _ => s"Unrecognized pattern. My value: $tuple"
}
}
def typedPatternMatching(any: Any): String = {
any match {
case string: String => s"I'm a string. My value: $string"
case integer: Int => s"I'm an integer. My value: $integer"
case _ => s"I'm from an unknown type. My value: $any"
}
}
def regexPatterns(toMatch: String): String = {
val numeric = """([0-9]+)""".r
val alphabetic = """([a-zA-Z]+)""".r
val alphanumeric = """([a-zA-Z0-9]+)""".r
toMatch match {
case numeric(value) => s"I'm a numeric with value $value"
case alphabetic(value) => s"I'm an alphabetic with value $value"
case alphanumeric(value) => s"I'm an alphanumeric with value $value"
case _ => s"I contain other characters than alphanumerics. My value $toMatch"
}
}
def optionsPatternMatching(option: Option[String]): String = {
option match {
case Some(value) => s"I'm not an empty option. Value $value"
case None => "I'm an empty option"
}
}
def patternGuards(toMatch: Any, maxLength: Int): String = {
toMatch match {
case list: List[Any] if (list.size <= maxLength) => "List is of acceptable size"
case list: List[Any] => "List has not an acceptable size"
case string: String if (string.length <= maxLength) => "String is of acceptable size"
case string: String => "String has not an acceptable size"
case _ => "Input is neither a List or a String"
}
}
def sealedClass(cardSuit: CardSuit): String = {
cardSuit match {
case Spike() => "Card is spike"
case Club() => "Card is club"
case Heart() => "Card is heart"
case Diamond() => "Card is diamond"
}
}
def extractors(person: Any): String = {
person match {
case Person(initials) => s"My initials are $initials"
case _ => "Could not extract initials"
}
}
def closuresPatternMatching(list: List[Any]): List[Any] = {
list.collect { case i: Int if (i < 10) => i }
}
def catchBlocksPatternMatching(exception: Exception): String = {
try {
throw exception
} catch {
case ex: IllegalArgumentException => "It's an IllegalArgumentException"
case ex: RuntimeException => "It's a RuntimeException"
case _ => "It's an unknown kind of exception"
}
}
}

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core-scala/src/main/scala/com/baeldung/scala/Utils.scala
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package com.baeldung.scala
/**
* Some utility methods.
*
* @author Chandra Prakash
*
*/
object Utils {
def average(x : Double, y : Double): Double = (x + y) / 2
def randomLessThan(d : Double): Double = {
var random = 0d
do {
random = Math.random()
} while (random >= d)
random
}
def power(x : Int, y : Int) : Int = {
def powNested(i : Int, accumulator : Int) : Int = {
if (i <= 0) accumulator
else powNested(i - 1, x * accumulator)
}
powNested(y, 1)
}
def fibonacci(n : Int) : Int = n match {
case 0 | 1 => 1
case x if x > 1 =>
fibonacci(x - 1) + fibonacci(x - 2)
}
}

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core-scala/src/test/scala/com/baeldung/scala/ControlStructuresDemoUnitTest.scala
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@ -1,33 +0,0 @@
package com.baeldung.scala
import com.baeldung.scala.ControlStructuresDemo._
import org.junit.Assert.assertEquals
import org.junit.Test
class ControlStructuresDemoUnitTest {
@Test
def givenTwoIntegers_whenGcdCalled_thenCorrectValueReturned() = {
assertEquals(3, gcd(15, 27))
}
@Test
def givenTwoIntegers_whenGcdIterCalled_thenCorrectValueReturned() = {
assertEquals(3, gcdIter(15, 27))
}
@Test
def givenTwoIntegers_whenRangeSumcalled_thenCorrectValueReturned() = {
assertEquals(55, rangeSum(1, 10))
}
@Test
def givenPositiveInteger_whenFactorialInvoked_thenCorrectValueReturned() = {
assertEquals(720, factorial(6))
}
@Test
def whenFactorialOf0Invoked_then1Returned() = {
assertEquals(1, factorial(0))
}
}

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core-scala/src/test/scala/com/baeldung/scala/EmployeeUnitTest.scala
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package com.baeldung.scala
import org.junit.Assert.assertEquals
import org.junit.Test
class EmployeeUnitTest {
@Test
def whenEmployeeSalaryIncremented_thenCorrectSalary() = {
val employee = new Employee("John Doe", 1000)
employee.incrementSalary()
assertEquals(1020, employee.salary)
}
@Test
def givenEmployee_whenToStringCalled_thenCorrectStringReturned() = {
val employee = new Employee("John Doe", 1000)
assertEquals("Employee(name=John Doe, salary=1000)", employee.toString)
}
@Test
def givenEmployeeWithTrait_whenToStringCalled_thenCorrectStringReturned() = {
val employee =
new Employee("John Doe", 1000) with UpperCasePrinter
assertEquals("EMPLOYEE(NAME=JOHN DOE, SALARY=1000)", employee.toString)
}
}

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core-scala/src/test/scala/com/baeldung/scala/HigherOrderFunctionsExamplesUnitTest.scala
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package com.baeldung.scala
import org.junit.Assert.assertEquals
import org.junit.Test
class HigherOrderFunctionsExamplesUnitTest {
@Test
def whenCallingMapWithAnonymousFunction_thenTransformationIsApplied() = {
val expected = Seq("sir Alex Ferguson", "sir Bobby Charlton", "sir Frank Lampard")
val names = Seq("Alex Ferguson", "Bobby Charlton", "Frank Lampard")
val sirNames = names.map(name => "sir " + name)
assertEquals(expected, sirNames)
}
@Test
def whenCallingMapWithDefined_thenTransformationIsApplied() = {
val expected = Seq("sir Alex Ferguson", "sir Bobby Charlton", "sir Frank Lampard")
val names = Seq("Alex Ferguson", "Bobby Charlton", "Frank Lampard")
def prefixWithSir(name: String) = "sir " + name
val sirNames = names.map(prefixWithSir)
assertEquals(expected, sirNames)
}
@Test
def whenCallingFilter_thenUnecessaryElementsAreRemoved() = {
val expected = Seq("John O'Shea", "John Hartson")
val names = Seq("John O'Shea", "Aiden McGeady", "John Hartson")
val johns = names.filter(name => name.matches("^John .*"))
assertEquals(expected, johns)
}
@Test
def whenCallingReduce_thenProperSumIsCalculated() = {
val expected = 2750
val earnings = Seq(1000, 1300, 450)
val sumEarnings = earnings.reduce((acc, x) => acc + x)
assertEquals(expected, sumEarnings)
}
@Test
def whenCallingFold_thenNumberOfWordsShouldBeCalculated() = {
val expected = 6
val strings = Seq("bunch of words", "just me", "it")
val sumEarnings = strings.foldLeft(0)((acc, x) => acc + x.split(" ").size)
assertEquals(expected, sumEarnings)
}
@Test
def whenCallingOwnHigherOrderFunction_thenProperFunctionIsReturned() = {
def mathOperation(name: String): (Int, Int) => Int = (x: Int, y: Int) => {
name match {
case "addition" => x + y
case "multiplication" => x * y
case "division" => x/y
case "subtraction" => x - y
}
}
def add: (Int, Int) => Int = mathOperation("addition")
def mul: (Int, Int) => Int = mathOperation("multiplication")
def div: (Int, Int) => Int = mathOperation("division")
def sub: (Int, Int) => Int = mathOperation("subtraction")
assertEquals(15, add(10, 5))
assertEquals(50, mul(10, 5))
assertEquals(2, div(10, 5))
assertEquals(5, sub(10, 5))
}
}

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core-scala/src/test/scala/com/baeldung/scala/HigherOrderFunctionsUnitTest.scala
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package com.baeldung.scala
import com.baeldung.scala.HigherOrderFunctions.mapReduce
import org.junit.Assert.assertEquals
import org.junit.Test
class HigherOrderFunctionsUnitTest {
@Test
def whenCalledWithSumAndSquareFunctions_thenCorrectValueReturned() = {
def square(x : Int) = x * x
def sum(x : Int, y : Int) = x + y
def sumSquares(a : Int, b : Int) =
mapReduce(sum, 0, square, a, b)
assertEquals(385, sumSquares(1, 10))
}
@Test
def whenComputingSumOfSquaresWithAnonymousFunctions_thenCorrectValueReturned() = {
def sumSquares(a : Int, b : Int) =
mapReduce((x, y) => x + y, 0, x => x * x, a, b)
assertEquals(385, sumSquares(1, 10))
}
@Test
def givenCurriedFunctions_whenInvoked_thenCorrectValueReturned() = {
// a curried function
def sum(f : Int => Int)(a : Int,
b : Int) : Int =
if (a > b) 0 else f(a) + sum(f)(a + 1, b)
// another curried function
def mod(n : Int)(x : Int) = x % n
// application of a curried function
assertEquals(1, mod(5)(6))
// partial application of curried function
// trailing underscore is required to make function type explicit
val sumMod5 = sum(mod(5)) _
assertEquals(10, sumMod5(6, 10))
}
}

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core-scala/src/test/scala/com/baeldung/scala/IntSetUnitTest.scala
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package com.baeldung.scala
import org.junit.Assert.assertFalse
import org.junit.Test
class IntSetUnitTest {
@Test
def givenSetof1To10_whenContains11Called_thenFalse() = {
// Set up a set containing integers 1 to 10.
val set1To10 =
Range(1, 10)
.foldLeft(new EmptyIntSet() : IntSet) {
(x, y) => x incl y
}
assertFalse(set1To10 contains 11)
}
}

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core-scala/src/test/scala/com/baeldung/scala/PatternMatchingUnitTest.scala
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package com.baeldung.scala
import java.io.FileNotFoundException
import org.junit.Assert.assertEquals
import org.junit.Test
class PatternMatchingUnitTest {
@Test
def whenAMammalIsGivenToTheMatchExpression_ThenItsRecognizedAsMammal(): Unit = {
val result = new PatternMatching().caseClassesPatternMatching(Mammal("Lion", fromSea = false))
assertEquals("I'm a Lion, a kind of mammal. Am I from the sea? false", result)
}
@Test
def whenABirdIsGivenToTheMatchExpression_ThenItsRecognizedAsBird(): Unit = {
val result = new PatternMatching().caseClassesPatternMatching(Bird("Pigeon"))
assertEquals("I'm a Pigeon, a kind of bird", result)
}
@Test
def whenAnUnkownAnimalIsGivenToTheMatchExpression_TheDefaultClauseIsUsed(): Unit = {
val result = new PatternMatching().caseClassesPatternMatching(Fish("Tuna"))
assertEquals("I'm an unknown animal", result)
}
@Test
def whenTheConstantZeroIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().constantsPatternMatching(0)
assertEquals("I'm equal to zero", result)
}
@Test
def whenFourAndAHalfIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().constantsPatternMatching(4.5d)
assertEquals("I'm a double", result)
}
@Test
def whenTheBooleanFalseIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().constantsPatternMatching(false)
assertEquals("I'm the contrary of true", result)
}
@Test
def whenAnUnkownConstantIsPassed_ThenTheDefaultPatternIsUsed(): Unit = {
val result = new PatternMatching().constantsPatternMatching(true)
assertEquals("I'm unknown and equal to true", result)
}
@Test
def whenASingleElementListIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().sequencesPatternMatching(List("String"))
assertEquals("I'm a list with one element: String", result)
}
@Test
def whenAMultipleElementsListIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().sequencesPatternMatching(List("Multiple", "Elements"))
assertEquals("I'm a list with one or multiple elements: List(Multiple, Elements)", result)
}
@Test
def whenAVectorBeginningWithOneAndTwoIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().sequencesPatternMatching(Vector(1, 2, 3))
assertEquals("I'm a vector: Vector(1, 2, 3)", result)
}
@Test
def whenANotMatchingVectorIsPassed_ThenItShouldntMatchAndEnterTheDefaultClause(): Unit = {
val result = new PatternMatching().sequencesPatternMatching(Vector(2, 1))
assertEquals("I'm an unrecognized sequence. My value: Vector(2, 1)", result)
}
@Test
def whenAnEmptyListIsPassed_ThenItShouldntMatchAndEnterTheDefaultClause(): Unit = {
val result = new PatternMatching().sequencesPatternMatching(List())
assertEquals("I'm an unrecognized sequence. My value: List()", result)
}
@Test
def whenATwoElementsTupleIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().tuplesPatternMatching(("First", "Second"))
assertEquals("I'm a tuple with two elements: First & Second", result)
}
@Test
def whenAThreeElementsTupleIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
val result = new PatternMatching().tuplesPatternMatching(("First", "Second", "Third"))
assertEquals("I'm a tuple with three elements: First & Second & Third", result)
}
@Test
def whenAnoterKindOfTupleIsPassed_ThenItShouldntMatchAndReturnTheDefaultPattern(): Unit = {
val result = new PatternMatching().tuplesPatternMatching(("First"))
assertEquals("Unrecognized pattern. My value: First", result)
}
@Test
def whenAStringConsistingOfNumericsOnlyIsPassed_ThenItShouldMatchTheNumericRegex(): Unit = {
val result = new PatternMatching().regexPatterns("123")
assertEquals("I'm a numeric with value 123", result)
}
@Test
def whenAStringConsistignOfAlphabeticsOnlyIsPassed_ThenItShouldMatchTheAlphabeticRegex(): Unit = {
val result = new PatternMatching().regexPatterns("abc")
assertEquals("I'm an alphabetic with value abc", result)
}
@Test
def whenAStringConsistignOfAlphanumericsOnlyIsPassed_ThenItShouldMatchTheAlphanumericRegex(): Unit = {
val result = new PatternMatching().regexPatterns("abc123")
assertEquals("I'm an alphanumeric with value abc123", result)
}
@Test
def whenAnotherTypeOfStringIsPassed_ThenItShouldntMatchAndReturnTheDefaultPattern(): Unit = {
val result = new PatternMatching().regexPatterns("abc_123")
assertEquals("I contain other characters than alphanumerics. My value abc_123", result)
}
@Test
def whenAFilledOptionIsPassed_ThenItShouldMatchTheSomeClause(): Unit = {
val result = new PatternMatching().optionsPatternMatching(Option.apply("something"))
assertEquals("I'm not an empty option. Value something", result)
}
@Test
def whenAnEmptyOptionIsPassed_ThenItShouldMatchTheNoneClause(): Unit = {
val result = new PatternMatching().optionsPatternMatching(Option.empty)
assertEquals("I'm an empty option", result)
}
@Test
def whenAListWithAcceptedSizeIsPassed_ThenThePositiveMessageIsSent(): Unit = {
val result = new PatternMatching().patternGuards(List(1, 2), 3)
assertEquals("List is of acceptable size", result)
}
@Test
def whenAListWithAnUnacceptedSizeIsPassed_ThenTheNegativeMessageIsSent(): Unit = {
val result = new PatternMatching().patternGuards(List(1, 2, 3, 4), 3)
assertEquals("List has not an acceptable size", result)
}
@Test
def whenAStringWithAcceptedSizeIsPassed_ThenThePositiveMessageIsSent(): Unit = {
val result = new PatternMatching().patternGuards("OK", 3)
assertEquals("String is of acceptable size", result)
}
@Test
def whenAStringWithAnUnacceptedSizeIsPassed_ThenTheNegativeMessageIsSent(): Unit = {
val result = new PatternMatching().patternGuards("Not OK", 3)
assertEquals("String has not an acceptable size", result)
}
@Test
def whenAnObjectWhichIsNotAListOrAStringIsPassed_thenTheDefaultClauseIsUsed(): Unit = {
val result = new PatternMatching().patternGuards(1, 1)
assertEquals("Input is neither a List or a String", result)
}
@Test
def whenACardSuitIsPassed_ThenTheCorrespondingMatchCaseClauseIsUsed(): Unit = {
assertEquals("Card is spike", new PatternMatching().sealedClass(Spike()))
assertEquals("Card is club", new PatternMatching().sealedClass(Club()))
assertEquals("Card is heart", new PatternMatching().sealedClass(Heart()))
assertEquals("Card is diamond", new PatternMatching().sealedClass(Diamond()))
}
@Test
def whenAnObjectWithExtractorIsPassed_ThenTheExtractedValueIsUsedInTheCaseClause(): Unit = {
val person = Person("John Smith")
val result = new PatternMatching().extractors(person)
assertEquals("My initials are J. S.", result)
}
@Test
def whenAnObjectWithExtractorIsPassed_AndTheValueIsEmpty_ThenTheDefaultCaseClauseIsUsed(): Unit = {
val person = Person("")
val result = new PatternMatching().extractors(person)
assertEquals("Could not extract initials", result)
}
@Test
def whenAListOfRandomElementsIsPassed_ThenOnlyTheIntegersBelowTenAreReturned(): Unit = {
val input = List(1, 2, "5", 11, true)
val result = new PatternMatching().closuresPatternMatching(input)
assertEquals(List(1, 2), result)
}
@Test
def whenAnExceptionIsPassed_ThenTheCorrespondingMessageIsReturned(): Unit = {
val pm = new PatternMatching()
val iae = new IllegalArgumentException()
val re = new RuntimeException()
val fnfe = new FileNotFoundException()
assertEquals("It's an IllegalArgumentException", pm.catchBlocksPatternMatching(iae))
assertEquals("It's a RuntimeException", pm.catchBlocksPatternMatching(re))
assertEquals("It's an unknown kind of exception", pm.catchBlocksPatternMatching(fnfe))
}
}

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core-scala/src/test/scala/com/baeldung/scala/UtilsUnitTest.scala
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@ -1,32 +0,0 @@
package com.baeldung.scala
import com.baeldung.scala.Utils.{average, fibonacci, power, randomLessThan}
import org.junit.Assert.{assertEquals, assertTrue}
import org.junit.Test
class UtilsUnitTest {
@Test
def whenAverageCalled_thenCorrectValueReturned(): Unit = {
assertEquals(15.0, average(10, 20), 1e-5)
}
@Test
def whenRandomLessThanInvokedWithANumber_thenARandomLessThanItReturned: Unit = {
val d = 0.1
assertTrue(randomLessThan(d) < d)
}
@Test
def whenPowerInvokedWith2And3_then8Returned: Unit = {
assertEquals(8, power(2, 3))
}
@Test
def whenFibonacciCalled_thenCorrectValueReturned: Unit = {
assertEquals(1, fibonacci(0))
assertEquals(1, fibonacci(1))
assertEquals(fibonacci(6),
fibonacci(4) + fibonacci(5))
}
}

73
core-scala/src/test/scala/com/baeldung/scala/regex/RegexUnitTest.scala
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@ -1,73 +0,0 @@
package com.baeldung.scala.regex
import org.junit.Test
import org.junit.Assert.assertEquals
class RegexUnitTest {
private val polishPostalCode = "([0-9]{2})\\-([0-9]{3})".r
private val timestamp = "([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{3})".r
private val timestampUnanchored = timestamp.unanchored
@Test
def givenRegularExpression_whenCallingFindFirstIn_thenShouldFindCorrectMatches(): Unit = {
val postCode = polishPostalCode.findFirstIn("Warsaw 01-011, Jerusalem Avenue")
assertEquals(Some("01-011"), postCode)
}
@Test
def givenRegularExpression_whenCallingFindFirstMatchIn_thenShouldFindCorrectMatches(): Unit = {
val postCodes = polishPostalCode.findFirstMatchIn("Warsaw 01-011, Jerusalem Avenue")
assertEquals(Some("011"), for (m <- postCodes) yield m.group(2))
}
@Test
def givenRegularExpression_whenCallingFindAllIn_thenShouldFindCorrectMatches(): Unit = {
val postCodes = polishPostalCode.findAllIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
.toList
assertEquals(List("01-011", "30-059"), postCodes)
polishPostalCode.findAllIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
}
@Test
def givenRegularExpression_whenCallingFindAlMatchlIn_thenShouldFindCorrectMatches(): Unit = {
val postCodes = polishPostalCode.findAllMatchIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
.toList
val postalDistricts = for (m <- postCodes) yield m.group(1)
assertEquals(List("01", "30"), postalDistricts)
}
@Test
def givenRegularExpression_whenExtractingValues_thenShouldExtractCorrectValues(): Unit = {
val description = "11:34:01.411" match {
case timestamp(hour, minutes, _, _) => s"It's $minutes minutes after $hour"
}
assertEquals("It's 34 minutes after 11", description)
}
@Test
def givenUnanchoredRegularExpression_whenExtractingValues_thenShouldExtractCorrectValues(): Unit = {
val description = "Timestamp: 11:34:01.411 error appeared" match {
case timestampUnanchored(hour, minutes, _, _) => s"It's $minutes minutes after $hour"
}
assertEquals("It's 34 minutes after 11", description)
}
@Test
def givenRegularExpression_whenCallingReplaceAllIn_thenShouldReplaceText(): Unit = {
val minutes = timestamp.replaceAllIn("11:34:01.311", m => m.group(2))
assertEquals("34", minutes)
}
@Test
def givenRegularExpression_whenCallingReplaceAllInWithMatcher_thenShouldReplaceText(): Unit = {
val secondsThatDayInTotal = timestamp.replaceAllIn("11:34:01.311", _ match {
case timestamp(hours, minutes, seconds, _) => s"$hours-$minutes"
})
assertEquals("11-34", secondsThatDayInTotal)
}
}

2
pom.xml
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@ -394,7 +394,6 @@
<module>core-java-modules</module> <module>core-java-modules</module>
<module>core-kotlin-modules</module> <module>core-kotlin-modules</module>
<module>core-scala</module>
<module>couchbase</module> <module>couchbase</module>
<module>custom-pmd</module> <module>custom-pmd</module>
@ -907,7 +906,6 @@
<module>core-java-modules</module> <module>core-java-modules</module>
<module>core-kotlin-modules</module> <module>core-kotlin-modules</module>
<module>core-scala</module>
<module>couchbase</module> <module>couchbase</module>
<module>custom-pmd</module> <module>custom-pmd</module>