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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. | ||
| */ | ||
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| package com.github.javaparser.symbolsolver.declarations.common; | ||
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| import com.github.javaparser.symbolsolver.core.resolution.Context; | ||
| import com.github.javaparser.symbolsolver.logic.InferenceContext; | ||
| import com.github.javaparser.symbolsolver.model.declarations.MethodDeclaration; | ||
| import com.github.javaparser.symbolsolver.model.declarations.TypeParameterDeclaration; | ||
| import com.github.javaparser.symbolsolver.model.methods.MethodUsage; | ||
| import com.github.javaparser.symbolsolver.model.resolution.TypeSolver; | ||
| import com.github.javaparser.symbolsolver.model.typesystem.Type; | ||
| import com.github.javaparser.symbolsolver.model.typesystem.TypeVariable; | ||
| import com.github.javaparser.symbolsolver.reflectionmodel.MyObjectProvider; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
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| /** | ||
| * @author Federico Tomassetti | ||
| */ | ||
| public class MethodDeclarationCommonLogic { | ||
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| private MethodDeclaration methodDeclaration; | ||
| private TypeSolver typeSolver; | ||
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| public MethodDeclarationCommonLogic(MethodDeclaration methodDeclaration, TypeSolver typeSolver) { | ||
| this.methodDeclaration = methodDeclaration; | ||
| this.typeSolver = typeSolver; | ||
| } | ||
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| public MethodUsage resolveTypeVariables(Context context, List<Type> parameterTypes) { | ||
| Type returnType = replaceTypeParams(methodDeclaration.getReturnType(), typeSolver, context); | ||
| List<Type> params = new ArrayList<>(); | ||
| for (int i = 0; i < methodDeclaration.getNumberOfParams(); i++) { | ||
| Type replaced = replaceTypeParams(methodDeclaration.getParam(i).getType(), typeSolver, context); | ||
| params.add(replaced); | ||
| } | ||
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| // 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++) { | ||
| Type formalParamType = methodDeclaration.getParam(i).getType(); | ||
| Type actualParamType = parameterTypes.get(i); | ||
| inferenceContext.addPair(formalParamType, actualParamType); | ||
| } | ||
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| returnType = inferenceContext.resolve(inferenceContext.addSingle(returnType)); | ||
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| return new MethodUsage(methodDeclaration, params, returnType); | ||
| } | ||
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| private Type replaceTypeParams(Type type, TypeSolver typeSolver, Context context) { | ||
| if (type.isTypeVariable()) { | ||
| TypeParameterDeclaration typeParameter = type.asTypeParameter(); | ||
| if (typeParameter.declaredOnType()) { | ||
| Optional<Type> typeParam = typeParamByName(typeParameter.getName(), typeSolver, context); | ||
| if (typeParam.isPresent()) { | ||
| type = typeParam.get(); | ||
| } | ||
| } | ||
| } | ||
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| if (type.isReferenceType()) { | ||
| type.asReferenceType().transformTypeParameters(tp -> replaceTypeParams(tp, typeSolver, context)); | ||
| } | ||
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| return type; | ||
| } | ||
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| protected Optional<Type> typeParamByName(String name, TypeSolver typeSolver, Context context) { | ||
| return methodDeclaration.getTypeParameters().stream().filter(tp -> tp.getName().equals(name)).map(tp -> toType(tp)).findFirst(); | ||
| } | ||
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| protected Type toType(TypeParameterDeclaration typeParameterDeclaration) { | ||
| return new TypeVariable(typeParameterDeclaration); | ||
| } | ||
| } |
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