Examples with Context com.github.javaparser.symbolsolver.core.resolution.Context used on opensource projects

Example 26 with Context

use of com.github.javaparser.symbolsolver.core.resolution.Context in project javaparser by javaparser.

the class LambdaExprContextResolutionTest method solveParameterOfLambdaInVarDecl.

@Test
public void solveParameterOfLambdaInVarDecl() {
    CompilationUnit cu = parseSample("Lambda");
    com.github.javaparser.ast.body.ClassOrInterfaceDeclaration clazz = Navigator.demandClass(cu, "Agenda");
    MethodDeclaration method = Navigator.demandMethod(clazz, "testFunctionalVar");
    VariableDeclarator varDecl = Navigator.demandVariableDeclaration(method, "a").get();
    LambdaExpr lambdaExpr = (LambdaExpr) varDecl.getInitializer().get();
    File src = adaptPath(new File("src/test/resources"));
    CombinedTypeSolver combinedTypeSolver = new CombinedTypeSolver();
    combinedTypeSolver.add(new ReflectionTypeSolver());
    combinedTypeSolver.add(new JavaParserTypeSolver(src));
    Context context = new LambdaExprContext(lambdaExpr, combinedTypeSolver);
    Optional<Value> ref = context.solveSymbolAsValue("p", typeSolver);
    assertTrue(ref.isPresent());
    assertEquals("java.lang.String", ref.get().getType().describe());
}

Example 27 with Context

use of com.github.javaparser.symbolsolver.core.resolution.Context in project javaparser by javaparser.

the class TypeExtractor method visit.

@Override
public ResolvedType visit(MethodReferenceExpr node, Boolean solveLambdas) {
    if (requireParentNode(node) instanceof MethodCallExpr) {
        MethodCallExpr callExpr = (MethodCallExpr) requireParentNode(node);
        int pos = JavaParserSymbolDeclaration.getParamPos(node);
        SymbolReference<ResolvedMethodDeclaration> refMethod = facade.solve(callExpr, false);
        if (!refMethod.isSolved()) {
            throw new com.github.javaparser.resolution.UnsolvedSymbolException(requireParentNode(node).toString(), callExpr.getName().getId());
        }
        logger.finest("getType on method reference expr " + refMethod.getCorrespondingDeclaration().getName());
        // logger.finest("Method param " + refMethod.getCorrespondingDeclaration().getParam(pos));
        if (solveLambdas) {
            MethodUsage usage = facade.solveMethodAsUsage(callExpr);
            ResolvedType result = usage.getParamType(pos);
            // We need to replace the type variables
            Context ctx = JavaParserFactory.getContext(node, typeSolver);
            result = solveGenericTypes(result, ctx, typeSolver);
            // lambdas
            if (FunctionalInterfaceLogic.getFunctionalMethod(result).isPresent()) {
                MethodReferenceExpr methodReferenceExpr = node;
                ResolvedType actualType = facade.toMethodUsage(methodReferenceExpr).returnType();
                ResolvedType formalType = FunctionalInterfaceLogic.getFunctionalMethod(result).get().returnType();
                InferenceContext inferenceContext = new InferenceContext(MyObjectProvider.INSTANCE);
                inferenceContext.addPair(formalType, actualType);
                result = inferenceContext.resolve(inferenceContext.addSingle(result));
            }
            return result;
        }
        return refMethod.getCorrespondingDeclaration().getParam(pos).getType();
    }
    throw new UnsupportedOperationException("The type of a method reference expr depends on the position and its return value");
}

Example 28 with Context

use of com.github.javaparser.symbolsolver.core.resolution.Context 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");
    }
}

Example 29 with Context

use of com.github.javaparser.symbolsolver.core.resolution.Context in project javaparser by javaparser.

the class JavaParserFacade method solve.

public SymbolReference<ResolvedAnnotationDeclaration> solve(AnnotationExpr annotationExpr) {
    Context context = JavaParserFactory.getContext(annotationExpr, typeSolver);
    SymbolReference<ResolvedTypeDeclaration> typeDeclarationSymbolReference = context.solveType(annotationExpr.getNameAsString(), typeSolver);
    ResolvedAnnotationDeclaration annotationDeclaration = (ResolvedAnnotationDeclaration) typeDeclarationSymbolReference.getCorrespondingDeclaration();
    if (typeDeclarationSymbolReference.isSolved()) {
        return SymbolReference.solved(annotationDeclaration);
    } else {
        return SymbolReference.unsolved(ResolvedAnnotationDeclaration.class);
    }
}

Example 30 with Context

use of com.github.javaparser.symbolsolver.core.resolution.Context in project javaparser by javaparser.

the class JavaParserFacade method convertToUsage.

protected ResolvedType convertToUsage(com.github.javaparser.ast.type.Type type, Context context) {
    if (context == null) {
        throw new NullPointerException("Context should not be null");
    }
    if (type instanceof ClassOrInterfaceType) {
        ClassOrInterfaceType classOrInterfaceType = (ClassOrInterfaceType) type;
        String name = qName(classOrInterfaceType);
        SymbolReference<ResolvedTypeDeclaration> ref = context.solveType(name, typeSolver);
        if (!ref.isSolved()) {
            throw new UnsolvedSymbolException(name);
        }
        ResolvedTypeDeclaration typeDeclaration = ref.getCorrespondingDeclaration();
        List<ResolvedType> typeParameters = Collections.emptyList();
        if (classOrInterfaceType.getTypeArguments().isPresent()) {
            typeParameters = classOrInterfaceType.getTypeArguments().get().stream().map((pt) -> convertToUsage(pt, context)).collect(Collectors.toList());
        }
        if (typeDeclaration.isTypeParameter()) {
            if (typeDeclaration instanceof ResolvedTypeParameterDeclaration) {
                return new ResolvedTypeVariable((ResolvedTypeParameterDeclaration) typeDeclaration);
            } else {
                JavaParserTypeVariableDeclaration javaParserTypeVariableDeclaration = (JavaParserTypeVariableDeclaration) typeDeclaration;
                return new ResolvedTypeVariable(javaParserTypeVariableDeclaration.asTypeParameter());
            }
        } else {
            return new ReferenceTypeImpl((ResolvedReferenceTypeDeclaration) typeDeclaration, typeParameters, typeSolver);
        }
    } else if (type instanceof com.github.javaparser.ast.type.PrimitiveType) {
        return ResolvedPrimitiveType.byName(((com.github.javaparser.ast.type.PrimitiveType) type).getType().name());
    } else if (type instanceof WildcardType) {
        WildcardType wildcardType = (WildcardType) type;
        if (wildcardType.getExtendedType().isPresent() && !wildcardType.getSuperType().isPresent()) {
            // removed (ReferenceTypeImpl)
            return ResolvedWildcard.extendsBound(convertToUsage(wildcardType.getExtendedType().get(), context));
        } else if (!wildcardType.getExtendedType().isPresent() && wildcardType.getSuperType().isPresent()) {
            // removed (ReferenceTypeImpl)
            return ResolvedWildcard.superBound(convertToUsage(wildcardType.getSuperType().get(), context));
        } else if (!wildcardType.getExtendedType().isPresent() && !wildcardType.getSuperType().isPresent()) {
            return ResolvedWildcard.UNBOUNDED;
        } else {
            throw new UnsupportedOperationException(wildcardType.toString());
        }
    } else if (type instanceof com.github.javaparser.ast.type.VoidType) {
        return ResolvedVoidType.INSTANCE;
    } else if (type instanceof com.github.javaparser.ast.type.ArrayType) {
        com.github.javaparser.ast.type.ArrayType jpArrayType = (com.github.javaparser.ast.type.ArrayType) type;
        return new ResolvedArrayType(convertToUsage(jpArrayType.getComponentType(), context));
    } else if (type instanceof UnionType) {
        UnionType unionType = (UnionType) type;
        return new ResolvedUnionType(unionType.getElements().stream().map(el -> convertToUsage(el, context)).collect(Collectors.toList()));
    } else if (type instanceof VarType) {
        Node parent = type.getParentNode().get();
        if (!(parent instanceof VariableDeclarator)) {
            throw new IllegalStateException("Trying to resolve a `var` which is not in a variable declaration.");
        }
        final VariableDeclarator variableDeclarator = (VariableDeclarator) parent;
        return variableDeclarator.getInitializer().map(Expression::calculateResolvedType).orElseThrow(() -> new IllegalStateException("Cannot resolve `var` which has no initializer."));
    } else {
        throw new UnsupportedOperationException(type.getClass().getCanonicalName());
    }
}