org.jetbrains.kotlin.types.StarProjectionImpl.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2015 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.types
import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
class StarProjectionImpl(
private val typeParameter: TypeParameterDescriptor
) : TypeProjectionBase() {
override fun isStarProjection() = true
override fun getProjectionKind() = Variance.OUT_VARIANCE
// No synchronization here: there's no problem in accidentally computing this twice
private val _type: JetType by lazy(LazyThreadSafetyMode.NONE) {
typeParameter.starProjectionType()
}
override fun getType() = _type
}
public fun TypeParameterDescriptor.starProjectionType(): JetType {
val classDescriptor = this.getContainingDeclaration() as ClassDescriptor
val typeParameters = classDescriptor.getTypeConstructor().getParameters().map { it.getTypeConstructor() }
return TypeSubstitutor.create(
object : TypeConstructorSubstitution() {
override fun get(key: TypeConstructor) =
if (key in typeParameters)
TypeUtils.makeStarProjection(key.getDeclarationDescriptor() as TypeParameterDescriptor)
else null
}
).substitute(this.getUpperBounds().first(), Variance.OUT_VARIANCE)!!
}
class TypeBasedStarProjectionImpl(
private val _type: JetType
) : TypeProjectionBase() {
override fun isStarProjection() = true
override fun getProjectionKind() = Variance.OUT_VARIANCE
override fun getType() = _type
}