org.jetbrains.kotlin.load.java.sam.SamConversionResolverImpl.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.load.java.sam
import org.jetbrains.kotlin.load.java.components.SamConversionResolver
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.resolve.scopes.JetScope
import org.jetbrains.kotlin.load.java.descriptors.*
import org.jetbrains.kotlin.load.java.lazy.descriptors.LazyJavaClassDescriptor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.load.java.structure.JavaMethod
import org.jetbrains.kotlin.types.JetType
import org.jetbrains.kotlin.load.java.sources.JavaSourceElement
import org.jetbrains.kotlin.load.java.structure.JavaClass
import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
import org.jetbrains.kotlin.types.TypeUtils
import java.util.ArrayList
import org.jetbrains.kotlin.types.checker.JetTypeChecker
public object SamConversionResolverImpl : SamConversionResolver {
override fun resolveSamConstructor(name: Name, scope: JetScope): SamConstructorDescriptor? {
val classifier = scope.getClassifier(name) as? LazyJavaClassDescriptor ?: return null
if (classifier.getFunctionTypeForSamInterface() == null) return null
return SingleAbstractMethodUtils.createSamConstructorFunction(scope.getContainingDeclaration(), classifier)
}
@Suppress("UNCHECKED_CAST")
override fun resolveSamAdapter(original: D): D? {
return when {
!SingleAbstractMethodUtils.isSamAdapterNecessary(original) -> null
original is JavaConstructorDescriptor -> SingleAbstractMethodUtils.createSamAdapterConstructor(original) as D
original is JavaMethodDescriptor -> SingleAbstractMethodUtils.createSamAdapterFunction(original) as D
else -> null
}
}
override fun resolveFunctionTypeIfSamInterface(
classDescriptor: JavaClassDescriptor,
resolveMethod: (JavaMethod) -> FunctionDescriptor
): JetType? {
val jClass = (classDescriptor.getSource() as? JavaSourceElement)?.javaElement as? JavaClass ?: return null
val samInterfaceMethod = SingleAbstractMethodUtils.getSamInterfaceMethod(jClass) ?: return null
val abstractMethod = if (jClass.getFqName() == samInterfaceMethod.getContainingClass().getFqName()) {
resolveMethod(samInterfaceMethod)
}
else {
findFunctionWithMostSpecificReturnType(TypeUtils.getAllSupertypes(classDescriptor.getDefaultType()))
}
return SingleAbstractMethodUtils.getFunctionTypeForAbstractMethod(abstractMethod)
}
private fun findFunctionWithMostSpecificReturnType(supertypes: Set): SimpleFunctionDescriptor {
val candidates = ArrayList(supertypes.size())
for (supertype in supertypes) {
val abstractMembers = SingleAbstractMethodUtils.getAbstractMembers(supertype)
if (!abstractMembers.isEmpty()) {
candidates.add((abstractMembers[0] as SimpleFunctionDescriptor))
}
}
if (candidates.isEmpty()) {
throw IllegalStateException("Couldn't find abstract method in supertypes " + supertypes)
}
var currentMostSpecificType = candidates[0]
for (candidate in candidates) {
val candidateReturnType = candidate.getReturnType()
val currentMostSpecificReturnType = currentMostSpecificType.getReturnType()
assert(candidateReturnType != null && currentMostSpecificReturnType != null) { "$candidate, $currentMostSpecificReturnType" }
if (JetTypeChecker.DEFAULT.isSubtypeOf(candidateReturnType!!, currentMostSpecificReturnType!!)) {
currentMostSpecificType = candidate
}
}
return currentMostSpecificType
}
}