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path: root/plugins/kotlin/analysis/src/org/jetbrains/kotlin/idea/decompiler/common/AnnotationLoaderForStubBuilderImpl.kt
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// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.

package org.jetbrains.kotlin.idea.decompiler.common

import org.jetbrains.kotlin.metadata.ProtoBuf
import org.jetbrains.kotlin.metadata.deserialization.NameResolver
import org.jetbrains.kotlin.name.ClassId
import org.jetbrains.kotlin.protobuf.MessageLite
import org.jetbrains.kotlin.serialization.SerializerExtensionProtocol
import org.jetbrains.kotlin.serialization.deserialization.AnnotatedCallableKind
import org.jetbrains.kotlin.serialization.deserialization.AnnotationAndConstantLoader
import org.jetbrains.kotlin.serialization.deserialization.ProtoContainer
import org.jetbrains.kotlin.serialization.deserialization.getClassId
import org.jetbrains.kotlin.types.KotlinType

class AnnotationLoaderForStubBuilderImpl(
    private val protocol: SerializerExtensionProtocol
) : AnnotationAndConstantLoader<ClassId, Unit> {

    override fun loadClassAnnotations(container: ProtoContainer.Class): List<ClassId> =
        container.classProto.getExtension(protocol.classAnnotation).orEmpty().map { container.nameResolver.getClassId(it.id) }

    override fun loadCallableAnnotations(
        container: ProtoContainer,
        proto: MessageLite,
        kind: AnnotatedCallableKind
    ): List<ClassId> {
        val annotations = when (proto) {
            is ProtoBuf.Constructor -> proto.getExtension(protocol.constructorAnnotation)
            is ProtoBuf.Function -> proto.getExtension(protocol.functionAnnotation)
            is ProtoBuf.Property -> when (kind) {
                AnnotatedCallableKind.PROPERTY -> proto.getExtension(protocol.propertyAnnotation)
                AnnotatedCallableKind.PROPERTY_GETTER -> proto.getExtension(protocol.propertyGetterAnnotation)
                AnnotatedCallableKind.PROPERTY_SETTER -> proto.getExtension(protocol.propertySetterAnnotation)
                else -> error("Unsupported callable kind with property proto")
            }
            else -> error("Unknown message: $proto")
        }.orEmpty()
        return annotations.map { container.nameResolver.getClassId(it.id) }
    }

    override fun loadPropertyBackingFieldAnnotations(container: ProtoContainer, proto: ProtoBuf.Property): List<ClassId> =
        emptyList()

    override fun loadPropertyDelegateFieldAnnotations(container: ProtoContainer, proto: ProtoBuf.Property): List<ClassId> =
        emptyList()

    override fun loadEnumEntryAnnotations(container: ProtoContainer, proto: ProtoBuf.EnumEntry): List<ClassId> =
        proto.getExtension(protocol.enumEntryAnnotation).orEmpty().map { container.nameResolver.getClassId(it.id) }

    override fun loadValueParameterAnnotations(
        container: ProtoContainer,
        callableProto: MessageLite,
        kind: AnnotatedCallableKind,
        parameterIndex: Int,
        proto: ProtoBuf.ValueParameter
    ): List<ClassId> =
        proto.getExtension(protocol.parameterAnnotation).orEmpty().map { container.nameResolver.getClassId(it.id) }

    override fun loadExtensionReceiverParameterAnnotations(
        container: ProtoContainer,
        proto: MessageLite,
        kind: AnnotatedCallableKind
    ): List<ClassId> = emptyList()

    override fun loadTypeAnnotations(
        proto: ProtoBuf.Type,
        nameResolver: NameResolver
    ): List<ClassId> =
        proto.getExtension(protocol.typeAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }

    override fun loadTypeParameterAnnotations(proto: ProtoBuf.TypeParameter, nameResolver: NameResolver): List<ClassId> =
        proto.getExtension(protocol.typeParameterAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }

    override fun loadPropertyConstant(
        container: ProtoContainer,
        proto: ProtoBuf.Property,
        expectedType: KotlinType
    ) {
    }

    override fun loadAnnotationDefaultValue(container: ProtoContainer, proto: ProtoBuf.Property, expectedType: KotlinType): Unit? = null
}