add BranchAndMerge
- add mockk to test dependencies
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96185eed8e
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GPG Key ID:
F5255658CB220573
@ -19,6 +19,7 @@ dependencies {
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testImplementation(Config.Libs.junit)
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testImplementation(Config.Libs.kluent)
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testImplementation(Config.Libs.mockk)
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// testImplementation(Config.Libs.spekDsl)
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// testRuntimeOnly(Config.Libs.kotlinReflect)
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@ -31,6 +31,7 @@ object Config {
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val junit = "5.1.0"
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val spek = "2.0.1"
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val kotlin = "1.3.21."
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val mockk = "1.9.2"
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}
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object Libs {
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@ -41,5 +42,6 @@ object Config {
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val spekDsl = "org.spekframework.spek2:spek-dsl-jvm:${Versions.spek}"
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val kotlinReflect = "org.jetbrains.kotlin:kotlin-reflect:${Versions.kotlin}"
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val spekRunner = "org.spekframework.spek2:spek-runner-junit5:${Versions.spek}"
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val mockk = "io.mockk:mockk:${Versions.mockk}"
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}
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}
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@ -0,0 +1,163 @@
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/*
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* MIT License
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*
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* Copyright (c) 2019 norangebit
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, tryMerge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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package it.norangeb.algorithms.exercises
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import java.io.File
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import java.io.PrintStream
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import java.util.Scanner
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object BranchAndMerge {
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private const val TMP_FILE_PATH_1 = "/tmp/file1"
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private const val TMP_FILE_PATH_2 = "/tmp/file2"
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fun run(source: File) {
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tryBranch(source)
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while (!isSorted()) {
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tryMerge(source)
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tryBranch(source)
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}
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}
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private fun isSorted(): Boolean {
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val sc1 = Scanner(File(TMP_FILE_PATH_1))
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val sc2 = Scanner(File(TMP_FILE_PATH_2))
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return !sc1.hasNextInt() || !sc2.hasNextInt()
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}
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private fun tryBranch(fileToSort: File) {
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try {
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val destination1 = PrintStream(File(TMP_FILE_PATH_1))
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val destination2 = PrintStream(File(TMP_FILE_PATH_2))
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val source = Scanner(fileToSort)
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branch(source, destination1, destination2)
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destination1.close()
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destination2.close()
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source.close()
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} catch (e: Exception) {
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e.printStackTrace()
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}
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}
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private fun branch(
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source: Scanner,
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destination1: PrintStream,
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destination2: PrintStream
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) {
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var destination = destination1
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var current: Int
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var last: Int? = null
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while (source.hasNextInt()) {
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current = source.nextInt()
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if (isLess(current, last))
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destination = switchDestination(
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destination, destination1, destination2
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)
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destination.println(current)
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last = current
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}
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}
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private fun tryMerge(fileToSort: File) {
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try {
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val source1 = Scanner(File(TMP_FILE_PATH_1))
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val source2 = Scanner(File(TMP_FILE_PATH_2))
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val destination = PrintStream(fileToSort)
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merge(source1, source2, destination)
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source1.close()
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source2.close()
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destination.close()
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} catch (e: Exception) {
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e.printStackTrace()
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}
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}
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private fun merge(source1: Scanner, source2: Scanner, destination: PrintStream) {
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var source = source1
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var current: Int
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var cache: Int? = null
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while (source1.hasNextInt() && source2.hasNextInt()) {
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if (cache == null)
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cache = switchSource(source, source1, source2).nextInt()
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current = source.nextInt()
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if (!isLess(current, cache)) {
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source = switchSource(source, source1, source2)
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current = cache.also { cache = current }
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}
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destination.println(current)
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}
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destination.println(cache)
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mergeTail(source1, source2, destination)
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}
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private fun mergeTail(
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source1: Scanner,
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source2: Scanner,
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destination: PrintStream
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) {
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while (source1.hasNextInt())
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destination.println(source1.nextInt())
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while (source2.hasNextInt())
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destination.println(source2.nextInt())
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}
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private fun isLess(current: Int, last: Int?): Boolean {
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if (last == null)
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return false
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return current < last
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}
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private fun switchDestination(
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currentDestination: PrintStream,
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destination1: PrintStream,
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destination2: PrintStream
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) = when (currentDestination) {
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destination1 -> destination2
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else -> destination1
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}
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private fun switchSource(
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currentSource: Scanner,
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source1: Scanner,
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source2: Scanner
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) = when (currentSource) {
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source1 -> source2
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else -> source1
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}
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}
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@ -0,0 +1,247 @@
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/*
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* MIT License
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*
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* Copyright (c) 2019 norangebit
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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package it.norangeb.algorithms.exercises
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import io.mockk.every
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import io.mockk.mockk
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import org.amshove.kluent.`should equal`
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import org.junit.jupiter.api.Test
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import java.io.File
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import java.io.PrintStream
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import java.util.Scanner
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import kotlin.reflect.full.memberFunctions
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import kotlin.reflect.jvm.isAccessible
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class BranchAndMergeTest {
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@Test
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fun branchTest() {
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val branch = BranchAndMerge::class.memberFunctions
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.find { it.name == "branch" }
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.also { it?.isAccessible = true }
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val list1 = arrayListOf<Int>()
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val list2 = arrayListOf<Int>()
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val source = mockk<Scanner>()
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val destination1 = mockk<PrintStream>()
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val destination2 = mockk<PrintStream>()
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every { source.hasNextInt() } returnsMany
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listOf(true, true, true, true, true, false)
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every { source.nextInt() } returnsMany listOf(3, 1, 4, 2, 0)
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every { destination1.println(any() as Int) } answers { list1.add(arg(0)) }
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every { destination2.println(any() as Int) } answers { list2.add(arg(0)) }
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branch?.call(BranchAndMerge, source, destination1, destination2)
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list1.toIntArray() `should equal` intArrayOf(3, 2)
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list2.toIntArray() `should equal` intArrayOf(1, 4, 0)
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}
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@Test
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fun noBranchTest() {
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val branch = BranchAndMerge::class.memberFunctions
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.find { it.name == "branch" }
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.also { it?.isAccessible = true }
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val list1 = arrayListOf<Int>()
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val list2 = arrayListOf<Int>()
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val source = mockk<Scanner>()
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val destination1 = mockk<PrintStream>()
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val destination2 = mockk<PrintStream>()
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every { source.hasNextInt() } returnsMany
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listOf(true, true, true, true, true, false)
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every { source.nextInt() } returnsMany listOf(1, 2, 3, 10, 12)
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every { destination1.println(any() as Int) } answers { list1.add(arg(0)) }
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branch?.call(BranchAndMerge, source, destination1, destination2)
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list1.toIntArray() `should equal` intArrayOf(1, 2, 3, 10, 12)
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list2.toIntArray() `should equal` intArrayOf()
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}
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@Test
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fun mergeTest() {
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val merge = BranchAndMerge::class.memberFunctions
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.find { it.name == "merge" }
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.also { it?.isAccessible = true }
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val list = arrayListOf<Int>()
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val source1 = mockk<Scanner>()
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val source2 = mockk<Scanner>()
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val destination = mockk<PrintStream>()
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every { source1.hasNextInt() } returnsMany
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listOf(true, true, true, false)
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every { source1.nextInt() } returnsMany listOf(3, 2)
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every { source2.hasNextInt() } returnsMany
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listOf(true, true, true, true, false)
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every { source2.nextInt() } returnsMany listOf(1, 4, 0)
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every { destination.println(any() as Int) } answers { list.add(arg(0)) }
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every { destination.println(any() as Int?) } answers { list.add(arg(0)) }
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merge?.call(BranchAndMerge, source1, source2, destination)
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list.toIntArray() `should equal` intArrayOf(1, 3, 2, 4, 0)
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}
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@Test
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fun switchSourceTest() {
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val switchSource = BranchAndMerge::class.memberFunctions
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.find { it.name == "switchSource" }
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.also { it?.isAccessible = true }
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val source1 = mockk<Scanner>()
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val source2 = mockk<Scanner>()
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val result1 = switchSource?.call(
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BranchAndMerge, source1, source1, source2
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)
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val result2 = switchSource?.call(
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BranchAndMerge, source2, source1, source2
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)
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result1 `should equal` source2
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result2 `should equal` source1
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}
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@Test
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fun switchDestinationTest() {
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val switchDestination = BranchAndMerge::class.memberFunctions
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.find { it.name == "switchDestination" }
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.also { it?.isAccessible = true }
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val destination1 = mockk<PrintStream>()
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val destination2 = mockk<PrintStream>()
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val result1 = switchDestination?.call(
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BranchAndMerge, destination1, destination1, destination2
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)
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val result2 = switchDestination?.call(
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BranchAndMerge, destination2, destination1, destination2
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)
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result1 `should equal` destination2
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result2 `should equal` destination1
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}
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@Test
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fun mergeTailEmptyTest() {
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val mergeTail = BranchAndMerge::class.memberFunctions
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.find { it.name == "mergeTail" }
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.also { it?.isAccessible = true }
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val list = arrayListOf<Int>()
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val source1 = mockk<Scanner>()
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val source2 = mockk<Scanner>()
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val destination = mockk<PrintStream>()
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every { source1.hasNextInt() } returns false
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every { source2.hasNextInt() } returns false
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every { destination.println(any() as Int) } answers { list.add(arg(0)) }
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mergeTail?.call(
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BranchAndMerge, source1, source2, destination
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)
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list.toIntArray() `should equal` intArrayOf()
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}
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@Test
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fun mergeTailFirstEmptyTest() {
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val mergeTail = BranchAndMerge::class.memberFunctions
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.find { it.name == "mergeTail" }
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.also { it?.isAccessible = true }
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val list = arrayListOf<Int>()
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val source1 = mockk<Scanner>()
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val source2 = mockk<Scanner>()
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val destination = mockk<PrintStream>()
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every { source1.hasNextInt() } returns false
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every { source2.hasNextInt() } returnsMany listOf(true, true, false)
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every { source2.nextInt() } returnsMany listOf(3, 7)
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every { destination.println(any() as Int) } answers { list.add(arg(0)) }
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mergeTail?.call(
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BranchAndMerge, source1, source2, destination
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)
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list.toIntArray() `should equal` intArrayOf(3, 7)
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}
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@Test
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fun mergeTailSecondEmptyTest() {
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val mergeTail = BranchAndMerge::class.memberFunctions
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.find { it.name == "mergeTail" }
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.also { it?.isAccessible = true }
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val list = arrayListOf<Int>()
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val source1 = mockk<Scanner>()
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val source2 = mockk<Scanner>()
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val destination = mockk<PrintStream>()
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every { source1.hasNextInt() } returnsMany listOf(true, false)
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every { source1.nextInt() } returns 1
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every { source2.hasNextInt() } returns false
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every { destination.println(any() as Int) } answers { list.add(arg(0)) }
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mergeTail?.call(
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BranchAndMerge, source1, source2, destination
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)
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list.toIntArray() `should equal` intArrayOf(1)
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}
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@Test
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fun sortAlreadySortedTest() {
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val path = "/tmp/test"
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val ps = PrintStream(path)
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val testSet = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 16, 21, 34, 45)
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testSet.forEach { ps.println(it) }
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ps.close()
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BranchAndMerge.run(File(path))
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File(path).readLines().map { it.toInt() } `should equal` testSet
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}
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@Test
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fun sortTest() {
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val path = "/tmp/test"
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val ps = PrintStream(path)
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val testSet = listOf(6, 2, 39, 4, 5, 11, 7, 99, 9, 10, 3, 16, 1, 45, 44)
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testSet.forEach { ps.println(it) }
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ps.close()
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BranchAndMerge.run(File(path))
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File(path).readLines().map { it.toInt() } `should equal` testSet.sorted()
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}
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}
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