| /* |
| * 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); |
| } |
| } |