Further simplify Java annotation resolution

Filter annotations by FQ name, get rid of unneeded properties, lazy values,
static import some stuff

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/LazyJavaAnnotations.kt

@@ -21,10 +21,11 @@ import org.jetbrains.kotlin.load.java.lazy.descriptors.resolveAnnotation
 import org.jetbrains.kotlin.load.java.structure.JavaAnnotation
 import org.jetbrains.kotlin.load.java.structure.JavaAnnotationOwner
 import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.resolve.DescriptorUtils
 
 class LazyJavaAnnotations(
         private val c: LazyJavaResolverContext,
-        val annotationOwner: JavaAnnotationOwner
+        private val annotationOwner: JavaAnnotationOwner
 ) : Annotations {
     private val annotationDescriptors = c.storageManager.createMemoizedFunctionWithNullableValues {
         annotation: JavaAnnotation ->
@@ -38,5 +39,25 @@ class LazyJavaAnnotations(
     override fun isEmpty() = !iterator().hasNext()
 }
 
+class FilteredAnnotations(
+        private val delegate: Annotations,
+        private val fqNameFilter: (FqName) -> Boolean
+) : Annotations {
+    override fun findAnnotation(fqName: FqName) =
+            if (fqNameFilter(fqName)) delegate.findAnnotation(fqName)
+            else null
+
+    override fun iterator() = delegate.sequence()
+            .filter { annotation ->
+                val descriptor = annotation.getType().getConstructor().getDeclarationDescriptor()
+                descriptor != null && DescriptorUtils.getFqName(descriptor).let { fqName ->
+                    fqName.isSafe() && fqNameFilter(fqName.toSafe())
+                }
+            }
+            .iterator()
+
+    override fun isEmpty() = !iterator().hasNext()
+}
+
 fun LazyJavaResolverContext.resolveAnnotations(annotationsOwner: JavaAnnotationOwner): Annotations
         = LazyJavaAnnotations(this, annotationsOwner)

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaMemberScope.kt

@@ -149,7 +149,7 @@ public abstract class LazyJavaMemberScope(
     protected fun computeMethodReturnType(method: JavaMethod, annotations: Annotations, c: LazyJavaResolverContext): JetType {
         val annotationMethod = method.getContainingClass().isAnnotationType()
         val returnTypeAttrs = LazyJavaTypeAttributes(
-                c, method, TypeUsage.MEMBER_SIGNATURE_COVARIANT, annotations,
+                TypeUsage.MEMBER_SIGNATURE_COVARIANT, annotations,
                 allowFlexible = !annotationMethod,
                 isForAnnotationParameter = annotationMethod
         )
@@ -172,7 +172,7 @@ public abstract class LazyJavaMemberScope(
             val (index, javaParameter) = pair
 
             val annotations = c.resolveAnnotations(javaParameter)
-            val typeUsage = LazyJavaTypeAttributes(c, javaParameter, TypeUsage.MEMBER_SIGNATURE_CONTRAVARIANT, annotations)
+            val typeUsage = LazyJavaTypeAttributes(TypeUsage.MEMBER_SIGNATURE_CONTRAVARIANT, annotations)
             val (outType, varargElementType) =
                     if (javaParameter.isVararg()) {
                         val paramType = javaParameter.getType() as? JavaArrayType
@@ -282,7 +282,7 @@ public abstract class LazyJavaMemberScope(
         val allowFlexible = PLATFORM_TYPES && !(finalStatic && c.javaPropertyInitializerEvaluator.isNotNullCompileTimeConstant(field))
         val propertyType = c.typeResolver.transformJavaType(
                 field.getType(),
-                LazyJavaTypeAttributes(c, field, TypeUsage.MEMBER_SIGNATURE_INVARIANT, annotations, allowFlexible)
+                LazyJavaTypeAttributes(TypeUsage.MEMBER_SIGNATURE_INVARIANT, annotations, allowFlexible)
         )
         if ((!allowFlexible || !PLATFORM_TYPES) && finalStatic) {
             return TypeUtils.makeNotNullable(propertyType)

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/types/LazyJavaTypeResolver.kt

@@ -20,10 +20,10 @@ import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
-import org.jetbrains.kotlin.descriptors.annotations.AnnotationsImpl
-import org.jetbrains.kotlin.load.java.JvmAnnotationNames
+import org.jetbrains.kotlin.load.java.JvmAnnotationNames.*
 import org.jetbrains.kotlin.load.java.components.TypeUsage
 import org.jetbrains.kotlin.load.java.components.TypeUsage.*
+import org.jetbrains.kotlin.load.java.lazy.FilteredAnnotations
 import org.jetbrains.kotlin.load.java.lazy.LazyJavaResolverContext
 import org.jetbrains.kotlin.load.java.lazy.TypeParameterResolver
 import org.jetbrains.kotlin.load.java.lazy.types.JavaTypeFlexibility.FLEXIBLE_LOWER_BOUND
@@ -34,7 +34,6 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.platform.JavaToKotlinClassMap
 import org.jetbrains.kotlin.resolve.jvm.PLATFORM_TYPES
 import org.jetbrains.kotlin.resolve.scopes.JetScope
-import org.jetbrains.kotlin.storage.get
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.Variance.INVARIANT
 import org.jetbrains.kotlin.types.Variance.IN_VARIANCE
@@ -364,35 +363,26 @@ enum class JavaTypeFlexibility {
 }
 
 class LazyJavaTypeAttributes(
-        c: LazyJavaResolverContext,
-        val annotationOwner: JavaAnnotationOwner,
         override val howThisTypeIsUsed: TypeUsage,
         annotations: Annotations,
         override val allowFlexible: Boolean = true,
         override val isForAnnotationParameter: Boolean = false
 ): JavaTypeAttributes {
-    override val typeAnnotations: Annotations by c.storageManager.createLazyValue {
-        AnnotationsImpl(JvmAnnotationNames.ANNOTATIONS_COPIED_TO_TYPES.map { fqName ->
-            annotations.findAnnotation(fqName)
-        }.filterNotNull())
-    }
+    override val typeAnnotations = FilteredAnnotations(annotations) { it in ANNOTATIONS_COPIED_TO_TYPES }
 
-    override val howThisTypeIsUsedAccordingToAnnotations: TypeUsage by c.storageManager.createLazyValue {
-        if (annotations.isMarkedReadOnly() && !annotations.isMarkedMutable())
-            TypeUsage.MEMBER_SIGNATURE_CONTRAVARIANT
-        else
-            TypeUsage.MEMBER_SIGNATURE_COVARIANT
-    }
+    override val howThisTypeIsUsedAccordingToAnnotations: TypeUsage get() =
+            if (hasAnnotation(JETBRAINS_READONLY_ANNOTATION) && !hasAnnotation(JETBRAINS_MUTABLE_ANNOTATION))
+                TypeUsage.MEMBER_SIGNATURE_CONTRAVARIANT
+            else
+                TypeUsage.MEMBER_SIGNATURE_COVARIANT
 
-    override val isMarkedNotNull: Boolean by c.storageManager.createLazyValue {
-        annotationOwner.findAnnotation(JvmAnnotationNames.JETBRAINS_NOT_NULL_ANNOTATION) != null
-    }
+    override val isMarkedNotNull: Boolean get() = typeAnnotations.isMarkedNotNull()
+
+    private fun hasAnnotation(fqName: FqName) = typeAnnotations.findAnnotation(fqName) != null
 }
 
-private fun Annotations.isMarkedReadOnly() = findAnnotation(JvmAnnotationNames.JETBRAINS_READONLY_ANNOTATION) != null
-private fun Annotations.isMarkedMutable() = findAnnotation(JvmAnnotationNames.JETBRAINS_MUTABLE_ANNOTATION) != null
-internal fun Annotations.isMarkedNotNull() = findAnnotation(JvmAnnotationNames.JETBRAINS_NOT_NULL_ANNOTATION) != null
-internal fun Annotations.isMarkedNullable() = findAnnotation(JvmAnnotationNames.JETBRAINS_NULLABLE_ANNOTATION) != null
+internal fun Annotations.isMarkedNotNull() = findAnnotation(JETBRAINS_NOT_NULL_ANNOTATION) != null
+internal fun Annotations.isMarkedNullable() = findAnnotation(JETBRAINS_NULLABLE_ANNOTATION) != null
 
 fun TypeUsage.toAttributes(allowFlexible: Boolean = true, isForAnnotationParameter: Boolean = false) = object : JavaTypeAttributes {
     override val howThisTypeIsUsed: TypeUsage = this@toAttributes