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org.jetbrains.kotlin.load.java.sam.JavaSingleAbstractMethodUtils Maven / Gradle / Ivy
/*
* 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.sam;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.descriptors.impl.ValueParameterDescriptorImpl;
import org.jetbrains.kotlin.load.java.descriptors.JavaClassConstructorDescriptor;
import org.jetbrains.kotlin.load.java.descriptors.JavaMethodDescriptor;
import org.jetbrains.kotlin.load.java.lazy.descriptors.LazyJavaClassDescriptor;
import org.jetbrains.kotlin.resolve.sam.*;
import org.jetbrains.kotlin.types.KotlinType;
import org.jetbrains.kotlin.types.TypeSubstitutor;
import org.jetbrains.kotlin.types.Variance;
import java.util.ArrayList;
import java.util.List;
public class JavaSingleAbstractMethodUtils {
private JavaSingleAbstractMethodUtils() {
}
public static boolean isSamClassDescriptor(@NotNull ClassDescriptor descriptor) {
if (descriptor.isFun()) return true;
if (descriptor instanceof LazyJavaClassDescriptor && descriptor.getDefaultFunctionTypeForSamInterface() != null) return true;
return false;
}
public static boolean isSamType(@NotNull KotlinType type) {
ClassifierDescriptor descriptor = type.getConstructor().getDeclarationDescriptor();
if (descriptor instanceof ClassDescriptor && ((ClassDescriptor) descriptor).isFun()) return true;
return SamConversionResolverImplKt.getFunctionTypeForSamType(
type, JavaBasedSamConversionResolver.INSTANCE, JavaBasedSamConversionOracle.INSTANCE
) != null;
}
public static boolean isSamAdapterNecessary(@NotNull FunctionDescriptor fun) {
for (ValueParameterDescriptor param : fun.getValueParameters()) {
if (isSamType(param.getType())) {
return true;
}
}
return false;
}
@NotNull
public static SamAdapterDescriptor createSamAdapterFunction(
@NotNull JavaMethodDescriptor original,
@NotNull SamConversionResolver samResolver,
@NotNull SamConversionOracle samConversionOracle,
boolean allowNonSpreadArraysForVarargAfterSam
) {
SamAdapterFunctionDescriptor result = new SamAdapterFunctionDescriptor(original);
return initSamAdapter(original, result, new FunctionInitializer() {
@Override
public void initialize(
@NotNull List typeParameters,
@NotNull List valueParameters,
@NotNull KotlinType returnType
) {
result.initialize(
null,
original.getDispatchReceiverParameter(),
typeParameters,
valueParameters,
returnType,
Modality.FINAL,
original.getVisibility()
);
}
}, samResolver, samConversionOracle, allowNonSpreadArraysForVarargAfterSam);
}
@NotNull
public static SamAdapterDescriptor createSamAdapterConstructor(
@NotNull JavaClassConstructorDescriptor original,
@NotNull SamConversionResolver samResolver,
@NotNull SamConversionOracle samConversionOracle,
boolean allowNonSpreadArraysForVarargAfterSam
) {
SamAdapterClassConstructorDescriptor result = new SamAdapterClassConstructorDescriptor(original);
return initSamAdapter(original, result, new FunctionInitializer() {
@Override
public void initialize(
@NotNull List typeParameters,
@NotNull List valueParameters,
@NotNull KotlinType returnType
) {
result.initialize(valueParameters, original.getVisibility());
result.setReturnType(returnType);
}
}, samResolver, samConversionOracle, allowNonSpreadArraysForVarargAfterSam);
}
@NotNull
private static SamAdapterDescriptor initSamAdapter(
@NotNull F original,
@NotNull SamAdapterDescriptor adapter,
@NotNull FunctionInitializer initializer,
@NotNull SamConversionResolver samResolver,
@NotNull SamConversionOracle samConversionOracle,
boolean allowNonSpreadArraysForVarargAfterSam
) {
SamConstructorTypeParameters typeParameters;
if (adapter instanceof SamAdapterClassConstructorDescriptor) {
typeParameters = new SamConstructorTypeParameters(original.getTypeParameters(), TypeSubstitutor.EMPTY);
} else {
typeParameters = SamConstructorUtilsKt.recreateAndInitializeTypeParameters(original.getTypeParameters(), adapter);
}
KotlinType returnTypeUnsubstituted = original.getReturnType();
assert returnTypeUnsubstituted != null : "Creating SAM adapter for not initialized original: " + original;
TypeSubstitutor substitutor = typeParameters.getSubstitutor();
KotlinType returnType = substitutor.substitute(returnTypeUnsubstituted, Variance.INVARIANT);
assert returnType != null : "couldn't substitute type: " + returnTypeUnsubstituted +
", substitutor = " + substitutor;
List valueParameters =
createValueParametersForSamAdapter(original, adapter, substitutor, samResolver, samConversionOracle, allowNonSpreadArraysForVarargAfterSam);
initializer.initialize(typeParameters.getDescriptors(), valueParameters, returnType);
return adapter;
}
public static List createValueParametersForSamAdapter(
@NotNull FunctionDescriptor original,
@NotNull FunctionDescriptor samAdapter,
@NotNull TypeSubstitutor substitutor,
@NotNull SamConversionResolver samResolver,
@NotNull SamConversionOracle samConversionOracle,
boolean allowNonSpreadArraysForVarargAfterSam
) {
List originalValueParameters = original.getValueParameters();
List valueParameters = new ArrayList<>(originalValueParameters.size());
for (ValueParameterDescriptor originalParam : originalValueParameters) {
KotlinType originalType = originalParam.getType();
KotlinType functionType = SamConversionResolverImplKt.getFunctionTypeForSamType(originalType, samResolver, samConversionOracle);
KotlinType newTypeUnsubstituted = functionType != null ? functionType : originalType;
KotlinType newType = substitutor.substitute(newTypeUnsubstituted, Variance.IN_VARIANCE);
assert newType != null : "couldn't substitute type: " + newTypeUnsubstituted + ", substitutor = " + substitutor;
/*
* Before 1.5 we allowed passing non-spread arrays into vararg parameter, after sam conversion like:
* public static String foo1(Runnable r, String... strs) { }
* ...
* Test.foo1({}, arrayOf())
* For that, we don't pass `varargElementType` from the original parameter descriptor.
*/
KotlinType varargElementType = allowNonSpreadArraysForVarargAfterSam ? null : originalParam.getVarargElementType();
ValueParameterDescriptor newParam = new ValueParameterDescriptorImpl(
samAdapter, null, originalParam.getIndex(), originalParam.getAnnotations(),
originalParam.getName(), newType,
/* declaresDefaultValue = */ false,
/* isCrossinline = */ false,
/* isNoinline = */ false,
varargElementType, SourceElement.NO_SOURCE
);
valueParameters.add(newParam);
}
return valueParameters;
}
private static abstract class FunctionInitializer {
public abstract void initialize(
@NotNull List typeParameters,
@NotNull List valueParameters,
@NotNull KotlinType returnType
);
}
}
