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Example 1 with ResolvedVoidType

use of com.github.javaparser.resolution.types.ResolvedVoidType in project javaparser by javaparser.

the class TypeExtractor method visit.

@Override
public ResolvedType visit(LambdaExpr node, Boolean solveLambdas) {
    if (requireParentNode(node) instanceof MethodCallExpr) {
        MethodCallExpr callExpr = (MethodCallExpr) requireParentNode(node);
        int pos = JavaParserSymbolDeclaration.getParamPos(node);
        SymbolReference<ResolvedMethodDeclaration> refMethod = facade.solve(callExpr);
        if (!refMethod.isSolved()) {
            throw new com.github.javaparser.resolution.UnsolvedSymbolException(requireParentNode(node).toString(), callExpr.getName().getId());
        }
        logger.finest("getType on lambda expr " + refMethod.getCorrespondingDeclaration().getName());
        if (solveLambdas) {
            // The type parameter referred here should be the java.util.stream.Stream.T
            ResolvedType result = refMethod.getCorrespondingDeclaration().getParam(pos).getType();
            if (callExpr.getScope().isPresent()) {
                Expression scope = callExpr.getScope().get();
                // If it is a static call we should not try to get the type of the scope
                boolean staticCall = false;
                if (scope instanceof NameExpr) {
                    NameExpr nameExpr = (NameExpr) scope;
                    try {
                        SymbolReference<ResolvedTypeDeclaration> type = JavaParserFactory.getContext(nameExpr, typeSolver).solveType(nameExpr.getName().getId(), typeSolver);
                        if (type.isSolved()) {
                            staticCall = true;
                        }
                    } catch (Exception e) {
                    }
                }
                if (!staticCall) {
                    ResolvedType scopeType = facade.getType(scope);
                    if (scopeType.isReferenceType()) {
                        result = scopeType.asReferenceType().useThisTypeParametersOnTheGivenType(result);
                    }
                }
            }
            // We need to replace the type variables
            Context ctx = JavaParserFactory.getContext(node, typeSolver);
            result = solveGenericTypes(result, ctx, typeSolver);
            // We should find out which is the functional method (e.g., apply) and replace the params of the
            // solveLambdas with it, to derive so the values. We should also consider the value returned by the
            // lambdas
            Optional<MethodUsage> functionalMethod = FunctionalInterfaceLogic.getFunctionalMethod(result);
            if (functionalMethod.isPresent()) {
                LambdaExpr lambdaExpr = node;
                InferenceContext lambdaCtx = new InferenceContext(MyObjectProvider.INSTANCE);
                InferenceContext funcInterfaceCtx = new InferenceContext(MyObjectProvider.INSTANCE);
                // At this point parameterType
                // if Function<T=? super Stream.T, ? extends map.R>
                // we should replace Stream.T
                ResolvedType functionalInterfaceType = ReferenceTypeImpl.undeterminedParameters(functionalMethod.get().getDeclaration().declaringType(), typeSolver);
                lambdaCtx.addPair(result, functionalInterfaceType);
                ResolvedType actualType;
                if (lambdaExpr.getBody() instanceof ExpressionStmt) {
                    actualType = facade.getType(((ExpressionStmt) lambdaExpr.getBody()).getExpression());
                } else if (lambdaExpr.getBody() instanceof BlockStmt) {
                    BlockStmt blockStmt = (BlockStmt) lambdaExpr.getBody();
                    // Get all the return statements in the lambda block
                    List<ReturnStmt> returnStmts = blockStmt.findAll(ReturnStmt.class);
                    if (returnStmts.size() > 0) {
                        actualType = returnStmts.stream().map(returnStmt -> returnStmt.getExpression().map(e -> facade.getType(e)).orElse(ResolvedVoidType.INSTANCE)).filter(x -> x != null && !x.isVoid() && !x.isNull()).findFirst().orElse(ResolvedVoidType.INSTANCE);
                    } else {
                        return ResolvedVoidType.INSTANCE;
                    }
                } else {
                    throw new UnsupportedOperationException();
                }
                ResolvedType formalType = functionalMethod.get().returnType();
                // Infer the functional interfaces' return vs actual type
                funcInterfaceCtx.addPair(formalType, actualType);
                // Substitute to obtain a new type
                ResolvedType functionalTypeWithReturn = funcInterfaceCtx.resolve(funcInterfaceCtx.addSingle(functionalInterfaceType));
                // we don't need to bother inferring types
                if (!(formalType instanceof ResolvedVoidType)) {
                    lambdaCtx.addPair(result, functionalTypeWithReturn);
                    result = lambdaCtx.resolve(lambdaCtx.addSingle(result));
                }
            }
            return result;
        } else {
            return refMethod.getCorrespondingDeclaration().getParam(pos).getType();
        }
    } else {
        throw new UnsupportedOperationException("The type of a lambda expr depends on the position and its return value");
    }
}
Also used : ExpressionStmt(com.github.javaparser.ast.stmt.ExpressionStmt) ReturnStmt(com.github.javaparser.ast.stmt.ReturnStmt) Navigator.requireParentNode(com.github.javaparser.symbolsolver.javaparser.Navigator.requireParentNode) Parameter(com.github.javaparser.ast.body.Parameter) MethodUsage(com.github.javaparser.resolution.MethodUsage) Value(com.github.javaparser.symbolsolver.model.resolution.Value) Level(java.util.logging.Level) VariableDeclarator(com.github.javaparser.ast.body.VariableDeclarator) ResolvedReferenceTypeDeclaration(com.github.javaparser.resolution.declarations.ResolvedReferenceTypeDeclaration) ResolvedType(com.github.javaparser.resolution.types.ResolvedType) ImmutableList(com.google.common.collect.ImmutableList) ResolvedArrayType(com.github.javaparser.resolution.types.ResolvedArrayType) Context(com.github.javaparser.symbolsolver.core.resolution.Context) CompilationUnit(com.github.javaparser.ast.CompilationUnit) JavaParserFacade.solveGenericTypes(com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.solveGenericTypes) MyObjectProvider(com.github.javaparser.symbolsolver.reflectionmodel.MyObjectProvider) JavaParserSymbolDeclaration(com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserSymbolDeclaration) UnknownType(com.github.javaparser.ast.type.UnknownType) ResolvedMethodDeclaration(com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration) UnsolvedSymbolException(com.github.javaparser.resolution.UnsolvedSymbolException) InferenceContext(com.github.javaparser.symbolsolver.logic.InferenceContext) TypeSolver(com.github.javaparser.symbolsolver.model.resolution.TypeSolver) ResolvedTypeDeclaration(com.github.javaparser.resolution.declarations.ResolvedTypeDeclaration) com.github.javaparser.symbolsolver.model.typesystem(com.github.javaparser.symbolsolver.model.typesystem) ReflectionClassDeclaration(com.github.javaparser.symbolsolver.reflectionmodel.ReflectionClassDeclaration) Logger(java.util.logging.Logger) ResolvedClassDeclaration(com.github.javaparser.resolution.declarations.ResolvedClassDeclaration) ResolvedVoidType(com.github.javaparser.resolution.types.ResolvedVoidType) FunctionalInterfaceLogic(com.github.javaparser.symbolsolver.logic.FunctionalInterfaceLogic) List(java.util.List) FieldDeclaration(com.github.javaparser.ast.body.FieldDeclaration) SymbolReference(com.github.javaparser.symbolsolver.model.resolution.SymbolReference) ResolvedPrimitiveType(com.github.javaparser.resolution.types.ResolvedPrimitiveType) ReflectionTypeSolver(com.github.javaparser.symbolsolver.resolution.typesolvers.ReflectionTypeSolver) Optional(java.util.Optional) ConsoleHandler(java.util.logging.ConsoleHandler) BlockStmt(com.github.javaparser.ast.stmt.BlockStmt) SymbolSolver(com.github.javaparser.symbolsolver.resolution.SymbolSolver) ClassOrInterfaceDeclaration(com.github.javaparser.ast.body.ClassOrInterfaceDeclaration) com.github.javaparser.ast.expr(com.github.javaparser.ast.expr) ResolvedTypeDeclaration(com.github.javaparser.resolution.declarations.ResolvedTypeDeclaration) ExpressionStmt(com.github.javaparser.ast.stmt.ExpressionStmt) ImmutableList(com.google.common.collect.ImmutableList) List(java.util.List) ResolvedType(com.github.javaparser.resolution.types.ResolvedType) UnsolvedSymbolException(com.github.javaparser.resolution.UnsolvedSymbolException) Context(com.github.javaparser.symbolsolver.core.resolution.Context) InferenceContext(com.github.javaparser.symbolsolver.logic.InferenceContext) InferenceContext(com.github.javaparser.symbolsolver.logic.InferenceContext) BlockStmt(com.github.javaparser.ast.stmt.BlockStmt) UnsolvedSymbolException(com.github.javaparser.resolution.UnsolvedSymbolException) ResolvedMethodDeclaration(com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration) MethodUsage(com.github.javaparser.resolution.MethodUsage) ReturnStmt(com.github.javaparser.ast.stmt.ReturnStmt) ResolvedVoidType(com.github.javaparser.resolution.types.ResolvedVoidType)

Aggregations

CompilationUnit (com.github.javaparser.ast.CompilationUnit)1 ClassOrInterfaceDeclaration (com.github.javaparser.ast.body.ClassOrInterfaceDeclaration)1 FieldDeclaration (com.github.javaparser.ast.body.FieldDeclaration)1 Parameter (com.github.javaparser.ast.body.Parameter)1 VariableDeclarator (com.github.javaparser.ast.body.VariableDeclarator)1 com.github.javaparser.ast.expr (com.github.javaparser.ast.expr)1 BlockStmt (com.github.javaparser.ast.stmt.BlockStmt)1 ExpressionStmt (com.github.javaparser.ast.stmt.ExpressionStmt)1 ReturnStmt (com.github.javaparser.ast.stmt.ReturnStmt)1 UnknownType (com.github.javaparser.ast.type.UnknownType)1 MethodUsage (com.github.javaparser.resolution.MethodUsage)1 UnsolvedSymbolException (com.github.javaparser.resolution.UnsolvedSymbolException)1 ResolvedClassDeclaration (com.github.javaparser.resolution.declarations.ResolvedClassDeclaration)1 ResolvedMethodDeclaration (com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration)1 ResolvedReferenceTypeDeclaration (com.github.javaparser.resolution.declarations.ResolvedReferenceTypeDeclaration)1 ResolvedTypeDeclaration (com.github.javaparser.resolution.declarations.ResolvedTypeDeclaration)1 ResolvedArrayType (com.github.javaparser.resolution.types.ResolvedArrayType)1 ResolvedPrimitiveType (com.github.javaparser.resolution.types.ResolvedPrimitiveType)1 ResolvedType (com.github.javaparser.resolution.types.ResolvedType)1 ResolvedVoidType (com.github.javaparser.resolution.types.ResolvedVoidType)1