norangebit-unisannio-computer-science/lm-tecniche-di-programmazione
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BranchAndMerge now work with generics

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- add gson dependencies
This commit is contained in:
Raffaele Mignone 2019-03-24 17:39:13 +01:00
parent 845779b71a
commit 47158bac88
Signed by: norangebit
GPG Key ID: F5255658CB220573
4 changed files with 210 additions and 85 deletions
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3
build.gradle.kts
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@ -1,7 +1,7 @@
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
plugins {
kotlin("jvm") version "1.3.21"
kotlin("jvm") version Config.Versions.kotlin
}
group = "norangebit"
@ -16,6 +16,7 @@ dependencies {
implementation(kotlin("stdlib-jdk8"))
implementation(Config.Libs.arrowCore)
implementation(Config.Libs.koin)
implementation(Config.Libs.gson)
testImplementation(Config.Libs.junit)
testImplementation(Config.Libs.kluent)

4
buildSrc/src/main/java/Config.kt
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@ -30,8 +30,9 @@ object Config {
val koin = "1.0.2"
val junit = "5.1.0"
val spek = "2.0.1"
val kotlin = "1.3.21."
val kotlin = "1.3.21"
val mockk = "1.9.2"
val gson = "2.8.5"
}
object Libs {
@ -43,5 +44,6 @@ object Config {
val kotlinReflect = "org.jetbrains.kotlin:kotlin-reflect:${Versions.kotlin}"
val spekRunner = "org.spekframework.spek2:spek-runner-junit5:${Versions.spek}"
val mockk = "io.mockk:mockk:${Versions.mockk}"
val gson = "com.google.code.gson:gson:${Versions.gson}"
}
}

63
src/main/kotlin/it/norangeb/algorithms/exercises/BranchAndMerge.kt
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@ -6,7 +6,7 @@
* 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, tryMerge, publish, distribute, sublicense, and/or sell
* 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:
*
@ -25,13 +25,20 @@
package it.norangeb.algorithms.exercises
import com.google.gson.Gson
import java.io.File
import java.io.PrintStream
import java.util.Scanner
object BranchAndMerge {
private const val TMP_FILE_PATH_1 = "/tmp/file1"
private const val TMP_FILE_PATH_2 = "/tmp/file2"
class BranchAndMerge<T>(
private val typeClass: Class<T>,
var compare: (obj1: T, obj2: T) -> Int
) {
companion object {
private const val TMP_FILE_PATH_1 = "/tmp/file1"
private const val TMP_FILE_PATH_2 = "/tmp/file2"
}
private val GSON = Gson()
fun run(source: File) {
tryBranch(source)
@ -45,7 +52,7 @@ object BranchAndMerge {
private fun isSorted(): Boolean {
val sc1 = Scanner(File(TMP_FILE_PATH_1))
val sc2 = Scanner(File(TMP_FILE_PATH_2))
return !sc1.hasNextInt() || !sc2.hasNextInt()
return !sc1.hasNextLine() || !sc2.hasNextLine()
}
private fun tryBranch(fileToSort: File) {
@ -70,16 +77,16 @@ object BranchAndMerge {
destination2: PrintStream
) {
var destination = destination1
var current: Int
var last: Int? = null
var current: T
var last: T? = null
while (source.hasNextInt()) {
current = source.nextInt()
while (source.hasNextLine()) {
current = fromJson(source.nextLine())
if (isLess(current, last))
destination = switchDestination(
destination, destination1, destination2
)
destination.println(current)
destination.println(toJson(current))
last = current
}
}
@ -103,23 +110,25 @@ object BranchAndMerge {
private fun merge(source1: Scanner, source2: Scanner, destination: PrintStream) {
var source = source1
var current: Int
var cache: Int? = null
var current: T
var cache: T? = null
while (source1.hasNextInt() && source2.hasNextInt()) {
while (source1.hasNextLine() && source2.hasNextLine()) {
if (cache == null)
cache = switchSource(source, source1, source2).nextInt()
cache = fromJson(
switchSource(source, source1, source2).nextLine()
)
current = source.nextInt()
current = fromJson(source.nextLine())
if (!isLess(current, cache)) {
source = switchSource(source, source1, source2)
current = cache.also { cache = current }
current = cache!!.also { cache = current }
}
destination.println(current)
destination.println(toJson(current))
}
destination.println(cache)
destination.println(toJson(cache!!))
mergeTail(source1, source2, destination)
}
@ -129,18 +138,18 @@ object BranchAndMerge {
source2: Scanner,
destination: PrintStream
) {
while (source1.hasNextInt())
destination.println(source1.nextInt())
while (source1.hasNextLine())
destination.println(source1.nextLine())
while (source2.hasNextInt())
destination.println(source2.nextInt())
while (source2.hasNextLine())
destination.println(source2.nextLine())
}
private fun isLess(current: Int, last: Int?): Boolean {
if (last == null)
private fun isLess(first: T, second: T?): Boolean {
if (second == null)
return false
return current < last
return compare(first, second) < 0
}
private fun switchDestination(
@ -160,4 +169,8 @@ object BranchAndMerge {
source1 -> source2
else -> source1
}
private fun fromJson(json: String) = GSON.fromJson(json, typeClass)
private fun toJson(obj: T) = GSON.toJson(obj)
}

225
src/test/kotlin/it/norangeb/algorithms/exercises/BranchAndMergeTest.kt
View File

@ -25,6 +25,7 @@
package it.norangeb.algorithms.exercises
import com.google.gson.Gson
import io.mockk.every
import io.mockk.mockk
import org.amshove.kluent.`should equal`
@ -43,22 +44,30 @@ class BranchAndMergeTest {
.find { it.name == "branch" }
.also { it?.isAccessible = true }
val list1 = arrayListOf<Int>()
val list2 = arrayListOf<Int>()
val list1 = arrayListOf<String>()
val list2 = arrayListOf<String>()
val source = mockk<Scanner>()
val destination1 = mockk<PrintStream>()
val destination2 = mockk<PrintStream>()
every { source.hasNextInt() } returnsMany
every { source.hasNextLine() } returnsMany
listOf(true, true, true, true, true, false)
every { source.nextInt() } returnsMany listOf(3, 1, 4, 2, 0)
every { destination1.println(any() as Int) } answers { list1.add(arg(0)) }
every { destination2.println(any() as Int) } answers { list2.add(arg(0)) }
every { source.nextLine() } returnsMany
listOf(3, 1, 4, 2, 0).map { it.toString() }
every { destination1.println(any() as String) } answers { list1.add(arg(0)) }
every { destination2.println(any() as String) } answers { list2.add(arg(0)) }
branch?.call(BranchAndMerge, source, destination1, destination2)
branch?.call(
BranchAndMerge(Int::class.java, this::defaultComparator),
source,
destination1,
destination2
)
list1.toIntArray() `should equal` intArrayOf(3, 2)
list2.toIntArray() `should equal` intArrayOf(1, 4, 0)
list1.map { it.toInt() }
.toIntArray() `should equal` intArrayOf(3, 2)
list2.map { it.toInt() }
.toIntArray() `should equal` intArrayOf(1, 4, 0)
}
@Test
@ -67,21 +76,29 @@ class BranchAndMergeTest {
.find { it.name == "branch" }
.also { it?.isAccessible = true }
val list1 = arrayListOf<Int>()
val list2 = arrayListOf<Int>()
val list1 = arrayListOf<String>()
val list2 = arrayListOf<String>()
val source = mockk<Scanner>()
val destination1 = mockk<PrintStream>()
val destination2 = mockk<PrintStream>()
every { source.hasNextInt() } returnsMany
every { source.hasNextLine() } returnsMany
listOf(true, true, true, true, true, false)
every { source.nextInt() } returnsMany listOf(1, 2, 3, 10, 12)
every { destination1.println(any() as Int) } answers { list1.add(arg(0)) }
every { source.nextLine() } returnsMany
listOf(1, 2, 3, 10, 12).map { it.toString() }
every { destination1.println(any() as String) } answers { list1.add(arg(0)) }
branch?.call(BranchAndMerge, source, destination1, destination2)
branch?.call(
BranchAndMerge(Int::class.java, this::defaultComparator),
source,
destination1,
destination2
)
list1.toIntArray() `should equal` intArrayOf(1, 2, 3, 10, 12)
list2.toIntArray() `should equal` intArrayOf()
list1.map { it.toInt() }
.toIntArray() `should equal` intArrayOf(1, 2, 3, 10, 12)
list2.map { it.toInt() }
.toIntArray() `should equal` intArrayOf()
}
@Test
@ -90,23 +107,33 @@ class BranchAndMergeTest {
.find { it.name == "merge" }
.also { it?.isAccessible = true }
val list = arrayListOf<Int>()
val list = arrayListOf<String>()
val source1 = mockk<Scanner>()
val source2 = mockk<Scanner>()
val destination = mockk<PrintStream>()
every { source1.hasNextInt() } returnsMany
every { source1.hasNextLine() } returnsMany
listOf(true, true, true, false)
every { source1.nextInt() } returnsMany listOf(3, 2)
every { source2.hasNextInt() } returnsMany
every { source1.nextLine() } returnsMany
listOf(3, 2).map { it.toString() }
every { source2.hasNextLine() } returnsMany
listOf(true, true, true, true, false)
every { source2.nextInt() } returnsMany listOf(1, 4, 0)
every { destination.println(any() as Int) } answers { list.add(arg(0)) }
every { destination.println(any() as Int?) } answers { list.add(arg(0)) }
every { source2.nextLine() } returnsMany
listOf(1, 4, 0).map { it.toString() }
every { destination.println(any() as String) }
.answers { list.add(arg(0)) }
every { destination.println(any() as String?) }
.answers { list.add(arg(0)) }
merge?.call(BranchAndMerge, source1, source2, destination)
merge?.call(
BranchAndMerge(Int::class.java, this::defaultComparator),
source1,
source2,
destination
)
list.toIntArray() `should equal` intArrayOf(1, 3, 2, 4, 0)
list.map { it.toInt() }
.toIntArray() `should equal` intArrayOf(1, 3, 2, 4, 0)
}
@Test
@ -119,10 +146,16 @@ class BranchAndMergeTest {
val source2 = mockk<Scanner>()
val result1 = switchSource?.call(
BranchAndMerge, source1, source1, source2
BranchAndMerge(Int::class.java, this::defaultComparator),
source1,
source1,
source2
)
val result2 = switchSource?.call(
BranchAndMerge, source2, source1, source2
BranchAndMerge(Int::class.java, this::defaultComparator),
source2,
source1,
source2
)
result1 `should equal` source2
@ -139,10 +172,16 @@ class BranchAndMergeTest {
val destination2 = mockk<PrintStream>()
val result1 = switchDestination?.call(
BranchAndMerge, destination1, destination1, destination2
BranchAndMerge(Int::class.java, this::defaultComparator),
destination1,
destination1,
destination2
)
val result2 = switchDestination?.call(
BranchAndMerge, destination2, destination1, destination2
BranchAndMerge(Int::class.java, this::defaultComparator),
destination2,
destination1,
destination2
)
result1 `should equal` destination2
@ -155,20 +194,24 @@ class BranchAndMergeTest {
.find { it.name == "mergeTail" }
.also { it?.isAccessible = true }
val list = arrayListOf<Int>()
val list = arrayListOf<String>()
val source1 = mockk<Scanner>()
val source2 = mockk<Scanner>()
val destination = mockk<PrintStream>()
every { source1.hasNextInt() } returns false
every { source2.hasNextInt() } returns false
every { destination.println(any() as Int) } answers { list.add(arg(0)) }
every { source1.hasNextLine() } returns false
every { source2.hasNextLine() } returns false
every { destination.println(any() as String) } answers { list.add(arg(0)) }
mergeTail?.call(
BranchAndMerge, source1, source2, destination
BranchAndMerge(Int::class.java, this::defaultComparator),
source1,
source2,
destination
)
list.toIntArray() `should equal` intArrayOf()
list.map { it.toInt() }
.toIntArray() `should equal` intArrayOf()
}
@Test
@ -177,21 +220,27 @@ class BranchAndMergeTest {
.find { it.name == "mergeTail" }
.also { it?.isAccessible = true }
val list = arrayListOf<Int>()
val list = arrayListOf<String>()
val source1 = mockk<Scanner>()
val source2 = mockk<Scanner>()
val destination = mockk<PrintStream>()
every { source1.hasNextInt() } returns false
every { source2.hasNextInt() } returnsMany listOf(true, true, false)
every { source2.nextInt() } returnsMany listOf(3, 7)
every { destination.println(any() as Int) } answers { list.add(arg(0)) }
every { source1.hasNextLine() } returns false
every { source2.hasNextLine() } returnsMany listOf(true, true, false)
every { source2.nextLine() } returnsMany
listOf(3, 7).map { it.toString() }
every { destination.println(any() as String) }
.answers { list.add(arg(0)) }
mergeTail?.call(
BranchAndMerge, source1, source2, destination
BranchAndMerge(Int::class.java, this::defaultComparator),
source1,
source2,
destination
)
list.toIntArray() `should equal` intArrayOf(3, 7)
list.map { it.toInt() }
.toIntArray() `should equal` intArrayOf(3, 7)
}
@Test
@ -200,48 +249,108 @@ class BranchAndMergeTest {
.find { it.name == "mergeTail" }
.also { it?.isAccessible = true }
val list = arrayListOf<Int>()
val list = arrayListOf<String>()
val source1 = mockk<Scanner>()
val source2 = mockk<Scanner>()
val destination = mockk<PrintStream>()
every { source1.hasNextInt() } returnsMany listOf(true, false)
every { source1.nextInt() } returns 1
every { source2.hasNextInt() } returns false
every { destination.println(any() as Int) } answers { list.add(arg(0)) }
every { source1.hasNextLine() } returnsMany listOf(true, false)
every { source1.nextLine() } returns "1"
every { source2.hasNextLine() } returns false
every { destination.println(any() as String) }
.answers { list.add(arg(0)) }
mergeTail?.call(
BranchAndMerge, source1, source2, destination
BranchAndMerge(Int::class.java, this::defaultComparator),
source1,
source2,
destination
)
list.toIntArray() `should equal` intArrayOf(1)
list.map { it.toInt() }
.toIntArray() `should equal` intArrayOf(1)
}
@Test
fun sortAlreadySortedTest() {
val path = "/tmp/test"
val ps = PrintStream(path)
val filePath = "/tmp/test"
val ps = PrintStream(filePath)
val testSet = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 16, 21, 34, 45)
testSet.forEach { ps.println(it) }
ps.close()
BranchAndMerge.run(File(path))
BranchAndMerge(Int::class.java, this::defaultComparator)
.run(File(filePath))
File(path).readLines().map { it.toInt() } `should equal` testSet
File(filePath).readLines()
.map { it.toInt() } `should equal` testSet
}
@Test
fun sortTest() {
val path = "/tmp/test"
val ps = PrintStream(path)
val filePath = "/tmp/test"
val ps = PrintStream(filePath)
val testSet = listOf(6, 2, 39, 4, 5, 11, 7, 99, 9, 10, 3, 16, 1, 45, 44)
testSet.forEach { ps.println(it) }
ps.close()
BranchAndMerge.run(File(path))
BranchAndMerge(Int::class.java, this::defaultComparator)
.run(File(filePath))
File(path).readLines().map { it.toInt() } `should equal` testSet.sorted()
File(filePath).readLines()
.map { it.toInt() } `should equal` testSet.sorted()
}
@Test
fun reverseSortTest() {
val filePath = "/tmp/test"
val ps = PrintStream(filePath)
val testSet = listOf(6, 2, 39, 4, 5, 11, 7, 99, 9, 10, 3, 16, 1, 45, 44)
testSet.forEach { ps.println(it) }
ps.close()
BranchAndMerge(Int::class.java) { it1, it2 -> it2.compareTo(it1) }
.run(File(filePath))
File(filePath).readLines()
.map { it.toInt() } `should equal` testSet.sorted().reversed()
}
data class Person(val firstName: String, val lastName: String, val age: Int)
@Test
fun sortPersonsByAge() {
val filePath = "/tmp/test"
val ps = PrintStream(filePath)
val gson = Gson()
val testSet = listOf(
Person("Name1", "Surname1", 25),
Person("Name2", "Surname2", 15),
Person("Name3", "Surname3", 39),
Person("Name4", "Surname4", 10),
Person("Name5", "Surname5", 4)
)
testSet.map { gson.toJson(it) }
.forEach { ps.println(it) }
ps.close()
val sortByAge = { p1: Person, p2: Person ->
p1.age.compareTo(p2.age)
}
BranchAndMerge(Person::class.java, sortByAge)
.run(File(filePath))
File(filePath).readLines()
.map { gson.fromJson(it, Person::class.java) } `should equal`
testSet.sortedBy { it.age }
}
private fun <T> defaultComparator(obj1: T, obj2: T): Int {
return (obj1 as Comparable<T>).compareTo(obj2)
}
}