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/*
* Copyright 2016 Federico Tomassetti
*
* 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 com.github.javaparser.symbolsolver.declarations.common;
import com.github.javaparser.resolution.MethodUsage;
import com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration;
import com.github.javaparser.resolution.declarations.ResolvedTypeParameterDeclaration;
import com.github.javaparser.resolution.types.ResolvedType;
import com.github.javaparser.resolution.types.ResolvedTypeVariable;
import com.github.javaparser.symbolsolver.core.resolution.Context;
import com.github.javaparser.symbolsolver.logic.InferenceContext;
import com.github.javaparser.symbolsolver.model.resolution.TypeSolver;
import com.github.javaparser.symbolsolver.reflectionmodel.MyObjectProvider;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
/**
* @author Federico Tomassetti
*/
public class MethodDeclarationCommonLogic {
private ResolvedMethodDeclaration methodDeclaration;
private TypeSolver typeSolver;
public MethodDeclarationCommonLogic(ResolvedMethodDeclaration methodDeclaration, TypeSolver typeSolver) {
this.methodDeclaration = methodDeclaration;
this.typeSolver = typeSolver;
}
public MethodUsage resolveTypeVariables(Context context, List<ResolvedType> parameterTypes) {
ResolvedType returnType = replaceTypeParams(methodDeclaration.getReturnType(), typeSolver, context);
List<ResolvedType> params = new ArrayList<>();
for (int i = 0; i < methodDeclaration.getNumberOfParams(); i++) {
ResolvedType replaced = replaceTypeParams(methodDeclaration.getParam(i).getType(), typeSolver, context);
params.add(replaced);
}
// We now look at the type parameter for the method which we can derive from the parameter types
// and then we replace them in the return type
// Map<TypeParameterDeclaration, Type> determinedTypeParameters = new HashMap<>();
InferenceContext inferenceContext = new InferenceContext(MyObjectProvider.INSTANCE);
for (int i = 0; i < methodDeclaration.getNumberOfParams() - (methodDeclaration.hasVariadicParameter() ? 1 : 0); i++) {
ResolvedType formalParamType = methodDeclaration.getParam(i).getType();
ResolvedType actualParamType = parameterTypes.get(i);
inferenceContext.addPair(formalParamType, actualParamType);
}
returnType = inferenceContext.resolve(inferenceContext.addSingle(returnType));
return new MethodUsage(methodDeclaration, params, returnType);
}
private ResolvedType replaceTypeParams(ResolvedType type, TypeSolver typeSolver, Context context) {
if (type.isTypeVariable()) {
ResolvedTypeParameterDeclaration typeParameter = type.asTypeParameter();
if (typeParameter.declaredOnType()) {
Optional<ResolvedType> typeParam = typeParamByName(typeParameter.getName(), typeSolver, context);
if (typeParam.isPresent()) {
type = typeParam.get();
}
}
}
if (type.isReferenceType()) {
type.asReferenceType().transformTypeParameters(tp -> replaceTypeParams(tp, typeSolver, context));
}
return type;
}
protected Optional<ResolvedType> typeParamByName(String name, TypeSolver typeSolver, Context context) {
return methodDeclaration.getTypeParameters().stream().filter(tp -> tp.getName().equals(name)).map(tp -> toType(tp)).findFirst();
}
protected ResolvedType toType(ResolvedTypeParameterDeclaration typeParameterDeclaration) {
return new ResolvedTypeVariable(typeParameterDeclaration);
}
}
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