Code cleanups

detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/TaskPool.kt

@@ -4,13 +4,12 @@ import java.io.Closeable
 import java.util.concurrent.CompletableFuture
 import java.util.concurrent.ExecutorService
 import java.util.concurrent.Executors
-import java.util.function.Supplier
 
 typealias Task<T> = CompletableFuture<T>
 typealias TaskList<T> = List<CompletableFuture<T>>
 
 fun <T> TaskPool.task(block: () -> T): Task<T> =
-    CompletableFuture.supplyAsync(Supplier { block() }, this)
+    CompletableFuture.supplyAsync({ block() }, this)
 
 fun <T> Task<T>.recover(block: (Throwable) -> T?): Task<T?> = this.exceptionally(block)
 

detekt-gradle-plugin/src/functionalTest/resources/jvm/src/main/kotlin/Errors.kt

@@ -8,6 +8,7 @@ class Errors {
     }
 
     fun javaExit() {
+        @Suppress("ReplaceJavaStaticMethodWithKotlinAnalog")
         System.exit(1)
     }
 }

detekt-gradle-plugin/src/main/kotlin/io/gitlab/arturbosch/detekt/extensions/CustomDetektReport.kt

@@ -15,7 +15,7 @@ open class CustomDetektReport @Inject constructor(objects: ObjectFactory) {
     @Deprecated("Use outputLocation.set(value)")
     @get:Internal
     var destination: File?
-        get() = outputLocation.asFile.getOrNull()
+        get() = outputLocation.asFile.orNull
         set(value) {
             outputLocation.set(value)
         }

detekt-gradle-plugin/src/main/kotlin/io/gitlab/arturbosch/detekt/extensions/DetektReport.kt

@@ -17,7 +17,7 @@ open class DetektReport @Inject constructor(val type: DetektReportType, objects:
 
     @Deprecated("Use outputLocation.set(value)")
     var destination: File?
-        get() = outputLocation.asFile.getOrNull()
+        get() = outputLocation.asFile.orNull
         set(value) {
             outputLocation.set(value)
         }

detekt-gradle-plugin/src/testFixtures/kotlin/io/gitlab/arturbosch/detekt/testkit/DslGradleRunner.kt

@@ -122,7 +122,7 @@ class DslGradleRunner @Suppress("LongParameterList") constructor(
 
     @OptIn(ExperimentalStdlibApi::class)
     private fun buildGradleRunner(tasks: List<String>): GradleRunner {
-        val args = buildList<String> {
+        val args = buildList {
             add("--stacktrace")
             add("--info")
             add("--build-cache")

detekt-report-html/src/main/kotlin/io/github/detekt/report/html/HtmlOutputReport.kt

@@ -62,8 +62,7 @@ class HtmlOutputReport : OutputReport() {
 
     private fun renderDate(): String {
         val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
-        val now = OffsetDateTime.now(ZoneOffset.UTC).format(formatter) + " UTC"
-        return now
+        return "${OffsetDateTime.now(ZoneOffset.UTC).format(formatter)} UTC"
     }
 
     private fun renderMetrics(metrics: Collection<ProjectMetric>) = createHTML().div {

detekt-report-xml/src/main/kotlin/io/github/detekt/report/xml/XmlEscape.kt

@@ -23,7 +23,6 @@ package io.github.detekt.report.xml
 
 import java.util.ArrayList
 import java.util.Arrays
-import java.util.Collections
 
 /**
  * Adapted from Unbescape - https://github.com/unbescape/unbescape/
@@ -33,7 +32,7 @@ import java.util.Collections
 object XmlEscape {
 
     private val REFERENCE_HEXA_PREFIX = "&#x".toCharArray()
-    private val REFERENCE_SUFFIX = ';'
+    private const val REFERENCE_SUFFIX = ';'
 
     /**
      * Perform an XML 1.0 level 2 (markup-significant and all non-ASCII chars) **escape** operation
@@ -169,7 +168,7 @@ object XmlEscape {
 @Suppress("ALL")
 private object Xml10EscapeSymbolsInitializer {
 
-    internal class XmlCodepointValidator {
+    class XmlCodepointValidator {
 
         /*
          * XML 1.0 does not allow many control characters, nor unpaired surrogate chars
@@ -221,7 +220,7 @@ private object Xml10EscapeSymbolsInitializer {
         /*
          * Everything non-ASCII is level 2 unless contrary indication.
          */
-        for (c in 0x80..XmlEscapeSymbols.LEVELS_LEN - 1) {
+        for (c in 0x80 until XmlEscapeSymbols.LEVELS_LEN) {
             escapeLevels[c] = 2
         }
 
@@ -376,16 +375,16 @@ private object Xml10EscapeSymbolsInitializer {
             SORTED_CODEPOINTS_BY_CER = IntArray(structureLen)
 
             val cersOrdered = ArrayList(cers)
-            Collections.sort(cersOrdered) { o1, o2 -> String(o1).compareTo(String(o2)) }
+            cersOrdered.sortWith { o1, o2 -> String(o1).compareTo(String(o2)) }
 
             val codepointsOrdered = ArrayList(codepoints)
-            Collections.sort(codepointsOrdered)
+            codepointsOrdered.sort()
 
             // Order the CODEPOINT -> CERs (escape)structures
-            for (i in 0..structureLen - 1) {
+            for (i in 0 until structureLen) {
                 val codepoint = codepointsOrdered[i]
                 SORTED_CODEPOINTS[i] = codepoint
-                for (j in 0..structureLen - 1) {
+                for (j in 0 until structureLen) {
                     if (codepoint == codepoints[j]) {
                         SORTED_CERS_BY_CODEPOINT[i] = cers[j]
                         break
@@ -394,10 +393,10 @@ private object Xml10EscapeSymbolsInitializer {
             }
 
             // Order the CERs -> CODEPOINT (unescape)structures
-            for (i in 0..structureLen - 1) {
+            for (i in 0 until structureLen) {
                 val cer = cersOrdered[i]
                 SORTED_CERS[i] = cer
-                for (j in 0..structureLen - 1) {
+                for (j in 0 until structureLen) {
                     if (Arrays.equals(cer, cers[j])) {
                         SORTED_CODEPOINTS_BY_CER[i] = codepoints[j]
                         break
@@ -428,7 +427,7 @@ private object Xml10EscapeSymbolsInitializer {
             /*
              * Size of the array specifying the escape levels.
              */
-            val LEVELS_LEN = (0x9f + 2)
+            const val LEVELS_LEN = (0x9f + 2)
         }
     }
 }