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/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.load.java.typeEnhancement
import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
import org.jetbrains.kotlin.descriptors.annotations.AnnotationWithTarget
import org.jetbrains.kotlin.descriptors.annotations.Annotations
import org.jetbrains.kotlin.descriptors.annotations.CompositeAnnotations
import org.jetbrains.kotlin.load.java.JvmAnnotationNames
import org.jetbrains.kotlin.load.java.lazy.types.RawTypeImpl
import org.jetbrains.kotlin.load.java.typeEnhancement.MutabilityQualifier.MUTABLE
import org.jetbrains.kotlin.load.java.typeEnhancement.MutabilityQualifier.READ_ONLY
import org.jetbrains.kotlin.load.java.typeEnhancement.NullabilityQualifier.NOT_NULL
import org.jetbrains.kotlin.load.java.typeEnhancement.NullabilityQualifier.NULLABLE
import org.jetbrains.kotlin.name.FqName
import org.jetbrains.kotlin.platform.JavaToKotlinClassMap
import org.jetbrains.kotlin.types.*
import org.jetbrains.kotlin.types.typeUtil.createProjection
import org.jetbrains.kotlin.types.typeUtil.isTypeParameter
// The index in the lambda is the position of the type component:
// Example: for `A>`, indices go as follows: `0 - A<...>, 1 - B, 2 - C, 3 - D, 4 - E`,
// which corresponds to the left-to-right breadth-first walk of the tree representation of the type.
// For flexible types, both bounds are indexed in the same way: `(A..C)` gives `0 - (A..C), 1 - B and D`.
fun KotlinType.enhance(qualifiers: (Int) -> JavaTypeQualifiers) = unwrap().enhancePossiblyFlexible(qualifiers, 0).typeIfChanged
fun KotlinType.hasEnhancedNullability()
= annotations.findAnnotation(JvmAnnotationNames.ENHANCED_NULLABILITY_ANNOTATION) != null
private enum class TypeComponentPosition {
FLEXIBLE_LOWER,
FLEXIBLE_UPPER,
INFLEXIBLE
}
private open class Result(open val type: KotlinType, val subtreeSize: Int, val wereChanges: Boolean) {
val typeIfChanged: KotlinType? get() = type.takeIf { wereChanges }
}
private class SimpleResult(override val type: SimpleType, subtreeSize: Int, wereChanges: Boolean): Result(type, subtreeSize, wereChanges)
private fun UnwrappedType.enhancePossiblyFlexible(qualifiers: (Int) -> JavaTypeQualifiers, index: Int): Result {
if (isError) return Result(this, 1, false)
return when(this) {
is FlexibleType -> {
val lowerResult = lowerBound.enhanceInflexible(qualifiers, index, TypeComponentPosition.FLEXIBLE_LOWER)
val upperResult = upperBound.enhanceInflexible(qualifiers, index, TypeComponentPosition.FLEXIBLE_UPPER)
assert(lowerResult.subtreeSize == upperResult.subtreeSize) {
"Different tree sizes of bounds: " +
"lower = ($lowerBound, ${lowerResult.subtreeSize}), " +
"upper = ($upperBound, ${upperResult.subtreeSize})"
}
val wereChanges = lowerResult.wereChanges || upperResult.wereChanges
Result(
if (wereChanges) {
if (this is RawTypeImpl) {
RawTypeImpl(lowerResult.type, upperResult.type)
}
else {
KotlinTypeFactory.flexibleType(lowerResult.type, upperResult.type)
}
}
else
this@enhancePossiblyFlexible,
lowerResult.subtreeSize,
wereChanges
)
}
is SimpleType -> enhanceInflexible(qualifiers, index, TypeComponentPosition.INFLEXIBLE)
}
}
private fun SimpleType.enhanceInflexible(qualifiers: (Int) -> JavaTypeQualifiers, index: Int, position: TypeComponentPosition): SimpleResult {
val shouldEnhance = position.shouldEnhance()
if (!shouldEnhance && arguments.isEmpty()) return SimpleResult(this, 1, false)
val originalClass = constructor.declarationDescriptor
?: return SimpleResult(this, 1, false)
val effectiveQualifiers = qualifiers(index)
val (enhancedClassifier, enhancedMutabilityAnnotations) = originalClass.enhanceMutability(effectiveQualifiers, position)
val typeConstructor = enhancedClassifier.typeConstructor
var globalArgIndex = index + 1
var wereChanges = enhancedMutabilityAnnotations != null
val enhancedArguments = arguments.mapIndexed {
localArgIndex, arg ->
if (arg.isStarProjection) {
globalArgIndex++
TypeUtils.makeStarProjection(enhancedClassifier.typeConstructor.parameters[localArgIndex])
}
else {
val enhanced = arg.type.unwrap().enhancePossiblyFlexible(qualifiers, globalArgIndex)
wereChanges = wereChanges || enhanced.wereChanges
globalArgIndex += enhanced.subtreeSize
createProjection(enhanced.type, arg.projectionKind, typeParameterDescriptor = typeConstructor.parameters[localArgIndex])
}
}
val (enhancedNullability, enhancedNullabilityAnnotations) = this.getEnhancedNullability(effectiveQualifiers, position)
wereChanges = wereChanges || enhancedNullabilityAnnotations != null
val subtreeSize = globalArgIndex - index
if (!wereChanges) return SimpleResult(this, subtreeSize, wereChanges = false)
val newAnnotations = listOf(
annotations,
enhancedMutabilityAnnotations,
enhancedNullabilityAnnotations
).filterNotNull().compositeAnnotationsOrSingle()
val enhancedType = KotlinTypeFactory.simpleType(
newAnnotations,
typeConstructor,
enhancedArguments,
enhancedNullability
)
val result = if (effectiveQualifiers.isNotNullTypeParameter) NotNullTypeParameter(enhancedType) else enhancedType
return SimpleResult(result, subtreeSize, wereChanges = true)
}
private fun List.compositeAnnotationsOrSingle() = when (size) {
0 -> error("At least one Annotations object expected")
1 -> single()
else -> CompositeAnnotations(this.toList())
}
private fun TypeComponentPosition.shouldEnhance() = this != TypeComponentPosition.INFLEXIBLE
private data class EnhancementResult(val result: T, val enhancementAnnotations: Annotations?)
private fun T.noChange() = EnhancementResult(this, null)
private fun T.enhancedNullability() = EnhancementResult(this, ENHANCED_NULLABILITY_ANNOTATIONS)
private fun T.enhancedMutability() = EnhancementResult(this, ENHANCED_MUTABILITY_ANNOTATIONS)
private fun ClassifierDescriptor.enhanceMutability(qualifiers: JavaTypeQualifiers, position: TypeComponentPosition): EnhancementResult {
if (!position.shouldEnhance()) return this.noChange()
if (this !is ClassDescriptor) return this.noChange() // mutability is not applicable for type parameters
val mapping = JavaToKotlinClassMap
when (qualifiers.mutability) {
READ_ONLY -> {
if (position == TypeComponentPosition.FLEXIBLE_LOWER && mapping.isMutable(this)) {
return mapping.convertMutableToReadOnly(this).enhancedMutability()
}
}
MUTABLE -> {
if (position == TypeComponentPosition.FLEXIBLE_UPPER && mapping.isReadOnly(this) ) {
return mapping.convertReadOnlyToMutable(this).enhancedMutability()
}
}
}
return this.noChange()
}
private fun KotlinType.getEnhancedNullability(qualifiers: JavaTypeQualifiers, position: TypeComponentPosition): EnhancementResult {
if (!position.shouldEnhance()) return this.isMarkedNullable.noChange()
return when (qualifiers.nullability) {
NULLABLE -> true.enhancedNullability()
NOT_NULL -> false.enhancedNullability()
else -> this.isMarkedNullable.noChange()
}
}
private val ENHANCED_NULLABILITY_ANNOTATIONS = EnhancedTypeAnnotations(JvmAnnotationNames.ENHANCED_NULLABILITY_ANNOTATION)
private val ENHANCED_MUTABILITY_ANNOTATIONS = EnhancedTypeAnnotations(JvmAnnotationNames.ENHANCED_MUTABILITY_ANNOTATION)
private class EnhancedTypeAnnotations(private val fqNameToMatch: FqName) : Annotations {
override fun isEmpty() = false
override fun findAnnotation(fqName: FqName) = when (fqName) {
fqNameToMatch -> EnhancedTypeAnnotationDescriptor
else -> null
}
override fun findExternalAnnotation(fqName: FqName) = null
override fun getAllAnnotations() = this.map { AnnotationWithTarget(it, null) }
override fun getUseSiteTargetedAnnotations() = emptyList()
// Note, that this class may break Annotations contract (!isEmpty && iterator.isEmpty())
// It's a hack that we need unless we have stable "user data" in JetType
override fun iterator(): Iterator = emptyList().iterator()
}
private object EnhancedTypeAnnotationDescriptor : AnnotationDescriptor {
private fun throwError(): Nothing = error("No methods should be called on this descriptor. Only its presence matters")
override fun getType() = throwError()
override fun getAllValueArguments() = throwError()
override fun getSource() = throwError()
override fun toString() = "[EnhancedType]"
}
internal class NotNullTypeParameter(override val delegate: SimpleType) : CustomTypeVariable, DelegatingSimpleType() {
override val isTypeVariable: Boolean
get() = true
override fun substitutionResult(replacement: KotlinType): KotlinType {
val unwrappedType = replacement.unwrap()
if (!TypeUtils.isNullableType(unwrappedType) && !unwrappedType.isTypeParameter()) return unwrappedType
return when (unwrappedType) {
is SimpleType -> unwrappedType.prepareReplacement()
is FlexibleType -> KotlinTypeFactory.flexibleType(unwrappedType.lowerBound.prepareReplacement(),
unwrappedType.upperBound.prepareReplacement())
else -> error("Incorrect type: $unwrappedType")
}
}
override val isMarkedNullable: Boolean
get() = false
private fun SimpleType.prepareReplacement(): SimpleType {
val result = makeNullableAsSpecified(false)
if (!this.isTypeParameter()) return result
return NotNullTypeParameter(result)
}
override fun replaceAnnotations(newAnnotations: Annotations) = NotNullTypeParameter(delegate.replaceAnnotations(newAnnotations))
override fun makeNullableAsSpecified(newNullability: Boolean) =
if (newNullability) delegate.makeNullableAsSpecified(true) else this
}
