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Move SAM function type calculation to SamConversionResolver

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This commit is contained in:
Alexander Udalov
2014-11-10 14:21:18 +03:00
parent 344c6f0b3f
commit 0b6bb38bb3
3 changed files with 57 additions and 45 deletions
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compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/resolver/SamConversionResolverImpl.kt
+47
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@@ -24,6 +24,15 @@ import org.jetbrains.jet.lang.resolve.java.sam.SingleAbstractMethodUtils
import org.jetbrains.jet.lang.descriptors.FunctionDescriptor
import org.jetbrains.jet.lang.resolve.java.descriptor.JavaConstructorDescriptor
import org.jetbrains.jet.lang.resolve.java.descriptor.JavaMethodDescriptor
import org.jetbrains.jet.lang.types.JetType
import org.jetbrains.jet.lang.types.TypeUtils
import org.jetbrains.jet.lang.descriptors.SimpleFunctionDescriptor
import java.util.ArrayList
import org.jetbrains.jet.lang.types.checker.JetTypeChecker
import org.jetbrains.jet.lang.resolve.java.structure.JavaMethod
import org.jetbrains.jet.lang.resolve.java.descriptor.JavaClassDescriptor
import org.jetbrains.jet.lang.resolve.java.structure.JavaClass
import org.jetbrains.jet.lang.resolve.java.sources.JavaSourceElement
public object SamConversionResolverImpl : SamConversionResolver {
override fun resolveSamConstructor(name: Name, scope: JetScope): SamConstructorDescriptor? {
@@ -41,4 +50,42 @@ public object SamConversionResolverImpl : SamConversionResolver {
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<JetType>): SimpleFunctionDescriptor {
val candidates = ArrayList<SimpleFunctionDescriptor>(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
}
}