Describe default settings for java nullability annotations depending on current kotlin version

core/util.runtime/src/org/jetbrains/kotlin/load/java/JavaNullabilityAnnotationSettings.kt

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.load.java
+
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.isChildOf
+
+val JSPECIFY_ANNOTATIONS_PACKAGE = FqName("org.jspecify.nullness")
+val CHECKER_FRAMEWORK_COMPATQUAL_ANNOTATIONS_PACKAGE = FqName("org.checkerframework.checker.nullness.compatqual")
+
+val nullabilityAnnotationSettings = mapOf(
+    FqName("org.jetbrains.annotations") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("androidx.annotation") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("android.support.annotation") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("android.annotation") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("com.android.annotations") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("org.eclipse.jdt.annotation") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("org.checkerframework.checker.nullness.qual") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    CHECKER_FRAMEWORK_COMPATQUAL_ANNOTATIONS_PACKAGE to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("javax.annotation") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("edu.umd.cs.findbugs.annotations") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("io.reactivex.annotations") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    FqName("lombok") to JavaNullabilityAnnotationsStatus.DEFAULT,
+    JSPECIFY_ANNOTATIONS_PACKAGE to JavaNullabilityAnnotationsStatus(
+        reportLevelBefore = ReportLevel.WARN,
+        sinceVersion = KotlinVersion(1, 6),
+        reportLevelAfter = ReportLevel.STRICT
+    ),
+)
+
+val jsr305Settings = JavaNullabilityAnnotationsStatus(
+    reportLevelBefore = ReportLevel.WARN,
+    sinceVersion = null
+)
+
+fun getDefaultReportLevelForAnnotation(annotationFqName: FqName) = getReportLevelForAnnotation(annotationFqName, emptyMap())
+
+fun getReportLevelForAnnotation(annotationFqName: FqName, configuredReportLevels: Map<FqName, ReportLevel>): ReportLevel {
+    val configuredReportLevel = configuredReportLevels.entries.find { (fqName, _) ->
+        annotationFqName == fqName || annotationFqName.isChildOf(fqName)
+    }?.value
+
+    if (configuredReportLevel != null) return configuredReportLevel
+
+    val defaultReportLevel = nullabilityAnnotationSettings.entries.find { (fqName, _) ->
+        annotationFqName == fqName || annotationFqName.isChildOf(fqName)
+    }?.value
+
+    require(defaultReportLevel != null) {
+        println(nullabilityAnnotationSettings)
+        "Default settings for nullability annotation ${annotationFqName.asString()} must be described"
+    }
+
+    return if (defaultReportLevel.sinceVersion != null && defaultReportLevel.sinceVersion <= KotlinVersion.CURRENT) {
+        defaultReportLevel.reportLevelAfter
+    } else {
+        defaultReportLevel.reportLevelBefore
+    }
+}
+
+

core/util.runtime/src/org/jetbrains/kotlin/load/java/JavaNullabilityAnnotationsStatus.kt

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+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.load.java
+
+data class JavaNullabilityAnnotationsStatus(
+    val reportLevelBefore: ReportLevel,
+    val sinceVersion: KotlinVersion? = KotlinVersion(1, 0),
+    val reportLevelAfter: ReportLevel = reportLevelBefore,
+) {
+    companion object {
+        val DEFAULT = JavaNullabilityAnnotationsStatus(ReportLevel.STRICT)
+    }
+}

core/util.runtime/src/org/jetbrains/kotlin/load/java/Jsr305Settings.kt

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+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.load.java
+
+import org.jetbrains.kotlin.name.FqName
+
+data class Jsr305Settings(
+    val globalLevel: ReportLevel,
+    val migrationLevel: ReportLevel? = null,
+    val userDefinedLevelForSpecificAnnotation: Map<FqName, ReportLevel> = emptyMap()
+) {
+    companion object {
+        val DEFAULT by lazy {
+            val reportLevelBefore = if (jsr305Settings.sinceVersion != null && jsr305Settings.sinceVersion <= KotlinVersion.CURRENT) {
+                jsr305Settings.reportLevelBefore
+            } else jsr305Settings.reportLevelAfter
+
+            Jsr305Settings(reportLevelBefore, if (reportLevelBefore == ReportLevel.WARN) null else reportLevelBefore)
+        }
+    }
+
+    @OptIn(ExperimentalStdlibApi::class)
+    val description by lazy {
+        buildList {
+            add(globalLevel.description)
+            migrationLevel?.let { add("under-migration:${it.description}") }
+            userDefinedLevelForSpecificAnnotation.forEach { add("@${it.key}:${it.value.description}") }
+        }.toTypedArray()
+    }
+
+    val isDisabled = globalLevel == ReportLevel.IGNORE
+            && migrationLevel == ReportLevel.IGNORE
+            && userDefinedLevelForSpecificAnnotation.isEmpty()
+}