Examples with MethodUsage com.github.javaparser.resolution.MethodUsage used on opensource projects

Example 26 with MethodUsage

use of com.github.javaparser.resolution.MethodUsage in project javaparser by javaparser.

the class StatementContextResolutionTest method resolveMethodOnGenericClass.

@Test
public void resolveMethodOnGenericClass() {
    CompilationUnit cu = parseSample("LocalVariableInParent");
    com.github.javaparser.ast.body.ClassOrInterfaceDeclaration referencesToField = Navigator.demandClass(cu, "LocalVariableInParent");
    MethodDeclaration method = Navigator.demandMethod(referencesToField, "foo5");
    MethodCallExpr call = Navigator.findMethodCall(method, "add").get();
    TypeSolver typeSolver = new ReflectionTypeSolver();
    SymbolReference<? extends ResolvedValueDeclaration> ref = JavaParserFacade.get(typeSolver).solve(call.getScope().get());
    assertTrue(ref.isSolved());
    assertEquals("java.util.List<Comment>", ref.getCorrespondingDeclaration().getType().describe());
    MethodUsage methodUsage = JavaParserFacade.get(typeSolver).solveMethodAsUsage(call);
    assertEquals("add", methodUsage.getName());
}

Example 27 with MethodUsage

use of com.github.javaparser.resolution.MethodUsage in project javaparser by javaparser.

the class MethodCallExprContextResolutionTest method assertCanSolveGenericMethodCallMustUseProvidedTypeArgs.

private void assertCanSolveGenericMethodCallMustUseProvidedTypeArgs(String callMethodName) {
    MethodCallExpr methodCallExpr = getMethodCallExpr("genericMethodTest", callMethodName);
    CombinedTypeSolver typeSolver = createTypeSolver();
    MethodCallExprContext context = new MethodCallExprContext(methodCallExpr, typeSolver);
    Optional<MethodUsage> ref = context.solveMethodAsUsage(callMethodName, Collections.emptyList(), typeSolver);
    assertTrue(ref.isPresent());
    assertEquals("MethodCalls", ref.get().declaringType().getQualifiedName());
    assertEquals(Collections.singletonList("java.lang.Integer"), ref.get().typeParametersMap().getTypes().stream().map(ty -> ty.asReferenceType().describe()).collect(Collectors.toList()));
}

Example 28 with MethodUsage

use of com.github.javaparser.resolution.MethodUsage 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 29 with MethodUsage

use of com.github.javaparser.resolution.MethodUsage 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 30 with MethodUsage

use of com.github.javaparser.resolution.MethodUsage in project javaparser by javaparser.

the class TypeExtractor method visit.

@Override
public ResolvedType visit(MethodCallExpr node, Boolean solveLambdas) {
    logger.finest("getType on method call " + node);
    // first solve the method
    MethodUsage ref = facade.solveMethodAsUsage(node);
    logger.finest("getType on method call " + node + " resolved to " + ref);
    logger.finest("getType on method call " + node + " return type is " + ref.returnType());
    return ref.returnType();
// the type is the return type of the method
}