Examples with InferenceContext com.github.javaparser.symbolsolver.logic.InferenceContext used on opensource projects

Example 6 with InferenceContext

use of com.github.javaparser.symbolsolver.logic.InferenceContext in project javaparser by javaparser.

the class LambdaExprContext method solveSymbolAsValue.

@Override
public Optional<Value> solveSymbolAsValue(String name, TypeSolver typeSolver) {
    for (Parameter parameter : wrappedNode.getParameters()) {
        SymbolDeclarator sb = JavaParserFactory.getSymbolDeclarator(parameter, typeSolver);
        int index = 0;
        for (ResolvedValueDeclaration decl : sb.getSymbolDeclarations()) {
            if (decl.getName().equals(name)) {
                if (requireParentNode(wrappedNode) instanceof MethodCallExpr) {
                    MethodCallExpr methodCallExpr = (MethodCallExpr) requireParentNode(wrappedNode);
                    MethodUsage methodUsage = JavaParserFacade.get(typeSolver).solveMethodAsUsage(methodCallExpr);
                    int i = pos(methodCallExpr, wrappedNode);
                    ResolvedType lambdaType = methodUsage.getParamTypes().get(i);
                    // Get the functional method in order for us to resolve it's type arguments properly
                    Optional<MethodUsage> functionalMethodOpt = FunctionalInterfaceLogic.getFunctionalMethod(lambdaType);
                    if (functionalMethodOpt.isPresent()) {
                        MethodUsage functionalMethod = functionalMethodOpt.get();
                        InferenceContext inferenceContext = new InferenceContext(MyObjectProvider.INSTANCE);
                        // Resolve each type variable of the lambda, and use this later to infer the type of each
                        // implicit parameter
                        inferenceContext.addPair(lambdaType, new ReferenceTypeImpl(lambdaType.asReferenceType().getTypeDeclaration(), typeSolver));
                        // Find the position of this lambda argument
                        boolean found = false;
                        int lambdaParamIndex;
                        for (lambdaParamIndex = 0; lambdaParamIndex < wrappedNode.getParameters().size(); lambdaParamIndex++) {
                            if (wrappedNode.getParameter(lambdaParamIndex).getName().getIdentifier().equals(name)) {
                                found = true;
                                break;
                            }
                        }
                        if (!found) {
                            return Optional.empty();
                        }
                        // Now resolve the argument type using the inference context
                        ResolvedType argType = inferenceContext.resolve(inferenceContext.addSingle(functionalMethod.getParamType(lambdaParamIndex)));
                        ResolvedLambdaConstraintType conType;
                        if (argType.isWildcard()) {
                            conType = ResolvedLambdaConstraintType.bound(argType.asWildcard().getBoundedType());
                        } else {
                            conType = ResolvedLambdaConstraintType.bound(argType);
                        }
                        Value value = new Value(conType, name);
                        return Optional.of(value);
                    } else {
                        return Optional.empty();
                    }
                } else if (requireParentNode(wrappedNode) instanceof VariableDeclarator) {
                    VariableDeclarator variableDeclarator = (VariableDeclarator) requireParentNode(wrappedNode);
                    ResolvedType t = JavaParserFacade.get(typeSolver).convertToUsageVariableType(variableDeclarator);
                    Optional<MethodUsage> functionalMethod = FunctionalInterfaceLogic.getFunctionalMethod(t);
                    if (functionalMethod.isPresent()) {
                        ResolvedType lambdaType = functionalMethod.get().getParamType(index);
                        // Replace parameter from declarator
                        Map<ResolvedTypeParameterDeclaration, ResolvedType> inferredTypes = new HashMap<>();
                        if (lambdaType.isReferenceType()) {
                            for (com.github.javaparser.utils.Pair<ResolvedTypeParameterDeclaration, ResolvedType> entry : lambdaType.asReferenceType().getTypeParametersMap()) {
                                if (entry.b.isTypeVariable() && entry.b.asTypeParameter().declaredOnType()) {
                                    ResolvedType ot = t.asReferenceType().typeParametersMap().getValue(entry.a);
                                    lambdaType = lambdaType.replaceTypeVariables(entry.a, ot, inferredTypes);
                                }
                            }
                        } else if (lambdaType.isTypeVariable() && lambdaType.asTypeParameter().declaredOnType()) {
                            lambdaType = t.asReferenceType().typeParametersMap().getValue(lambdaType.asTypeParameter());
                        }
                        Value value = new Value(lambdaType, name);
                        return Optional.of(value);
                    } else {
                        throw new UnsupportedOperationException();
                    }
                } else {
                    throw new UnsupportedOperationException();
                }
            }
            index++;
        }
    }
    // if nothing is found we should ask the parent context
    return getParent().solveSymbolAsValue(name, typeSolver);
}