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Example 1 with Optional.empty

use of java.util.Optional.empty in project drools by kiegroup.

the class ExpressionTyper method toTypedExpressionRec.

private Optional<TypedExpression> toTypedExpressionRec(Expression drlxExpr) {
    Class<?> typeCursor = patternType;
    if (drlxExpr instanceof FullyQualifiedInlineCastExpr) {
        return toTypedExpressionRec(transformFullyQualifiedInlineCastExpr(ruleContext.getTypeResolver(), (FullyQualifiedInlineCastExpr) drlxExpr));
    }
    if (drlxExpr instanceof EnclosedExpr) {
        Expression inner = ((EnclosedExpr) drlxExpr).getInner();
        Optional<TypedExpression> typedExpression = toTypedExpressionRec(inner);
        return typedExpression.map(t -> t.cloneWithNewExpression(new EnclosedExpr(t.getExpression())));
    }
    if (drlxExpr instanceof MethodCallExpr) {
        MethodCallExpr methodExpr = (MethodCallExpr) drlxExpr;
        Expression expr = methodExpr;
        if (isEval(methodExpr.getNameAsString(), methodExpr.getScope(), methodExpr.getArguments())) {
            expr = methodExpr.getArgument(0);
        }
        drlxExpr = expr;
    }
    if (drlxExpr instanceof NullSafeMethodCallExpr) {
        NullSafeMethodCallExpr methodExpr = (NullSafeMethodCallExpr) drlxExpr;
        Expression expr = methodExpr;
        if (isEval(methodExpr.getNameAsString(), methodExpr.getScope(), methodExpr.getArguments())) {
            expr = methodExpr.getArgument(0);
        }
        drlxExpr = expr;
    }
    if (drlxExpr instanceof UnaryExpr) {
        UnaryExpr unaryExpr = (UnaryExpr) drlxExpr;
        Optional<TypedExpression> optTypedExpr = toTypedExpressionRec(unaryExpr.getExpression());
        return optTypedExpr.map(typedExpr -> new TypedExpression(new UnaryExpr(typedExpr.getExpression(), unaryExpr.getOperator()), typedExpr.getType()));
    }
    if (drlxExpr instanceof BinaryExpr) {
        BinaryExpr binaryExpr = (BinaryExpr) drlxExpr;
        BinaryExpr.Operator operator = binaryExpr.getOperator();
        Optional<TypedExpression> optLeft = toTypedExpressionRec(binaryExpr.getLeft());
        Optional<TypedExpression> optRight = toTypedExpressionRec(binaryExpr.getRight());
        return optLeft.flatMap(left -> optRight.flatMap(right -> {
            final BinaryExpr combo = new BinaryExpr(left.getExpression(), right.getExpression(), operator);
            return of(new TypedExpression(combo, left.getType()));
        }));
    }
    if (drlxExpr instanceof HalfBinaryExpr) {
        final Expression binaryExpr = trasformHalfBinaryToBinary(drlxExpr);
        if (binaryExpr instanceof BinaryExpr && ((BinaryExpr) binaryExpr).getLeft() == drlxExpr) {
            throw new CannotTypeExpressionException("left leaf is the same : drlxExpr = " + drlxExpr + ", originalExpression = " + context.getOriginalExpression());
        }
        return toTypedExpressionRec(binaryExpr);
    }
    if (drlxExpr instanceof LiteralExpr) {
        drlxExpr = normalizeDigit(drlxExpr);
        return of(new TypedExpression(drlxExpr, getLiteralExpressionType((LiteralExpr) drlxExpr)));
    }
    if (drlxExpr instanceof ThisExpr || (drlxExpr instanceof NameExpr && THIS_PLACEHOLDER.equals(printNode(drlxExpr)))) {
        return of(new TypedExpression(new NameExpr(THIS_PLACEHOLDER), patternType));
    }
    if (drlxExpr instanceof CastExpr) {
        CastExpr castExpr = (CastExpr) drlxExpr;
        Optional<TypedExpression> optTypedExpr = toTypedExpressionRec(castExpr.getExpression());
        return optTypedExpr.map(typedExpr -> new TypedExpression(new CastExpr(castExpr.getType(), typedExpr.getExpression()), getClassFromContext(ruleContext.getTypeResolver(), castExpr.getType().asString())));
    }
    if (drlxExpr instanceof NameExpr) {
        return nameExpr(((NameExpr) drlxExpr).getNameAsString(), typeCursor);
    }
    if (drlxExpr instanceof FieldAccessExpr || drlxExpr instanceof MethodCallExpr || drlxExpr instanceof ObjectCreationExpr || drlxExpr instanceof NullSafeFieldAccessExpr || drlxExpr instanceof NullSafeMethodCallExpr || drlxExpr instanceof MapCreationLiteralExpression || drlxExpr instanceof ListCreationLiteralExpression) {
        return toTypedExpressionFromMethodCallOrField(drlxExpr).getTypedExpression();
    }
    if (drlxExpr instanceof PointFreeExpr) {
        final PointFreeExpr pointFreeExpr = (PointFreeExpr) drlxExpr;
        Optional<TypedExpression> optLeft = toTypedExpressionRec(pointFreeExpr.getLeft());
        Optional<TypedExpression> optRight = pointFreeExpr.getRight().size() == 1 ? toTypedExpressionRec(pointFreeExpr.getRight().get(0)) : Optional.empty();
        OperatorSpec opSpec = getOperatorSpec(pointFreeExpr.getRight(), pointFreeExpr.getOperator());
        return optLeft.map(left -> new TypedExpression(opSpec.getExpression(ruleContext, pointFreeExpr, left, this), left.getType()).setStatic(opSpec.isStatic()).setLeft(left).setRight(optRight.orElse(null)));
    }
    if (drlxExpr instanceof HalfPointFreeExpr) {
        final HalfPointFreeExpr halfPointFreeExpr = (HalfPointFreeExpr) drlxExpr;
        Expression parentLeft = findLeftLeafOfNameExprTraversingParent(halfPointFreeExpr);
        if (parentLeft == halfPointFreeExpr) {
            throw new CannotTypeExpressionException("left leaf is the same : halfPointFreeExpr = " + halfPointFreeExpr + ", originalExpression = " + context.getOriginalExpression());
        }
        Optional<TypedExpression> optLeft = toTypedExpressionRec(parentLeft);
        OperatorSpec opSpec = getOperatorSpec(halfPointFreeExpr.getRight(), halfPointFreeExpr.getOperator());
        final PointFreeExpr transformedToPointFree = new PointFreeExpr(halfPointFreeExpr.getTokenRange().orElseThrow(() -> new IllegalStateException("Token range is not present!")), parentLeft, halfPointFreeExpr.getRight(), halfPointFreeExpr.getOperator(), halfPointFreeExpr.isNegated(), halfPointFreeExpr.getArg1(), halfPointFreeExpr.getArg2(), halfPointFreeExpr.getArg3(), halfPointFreeExpr.getArg4());
        return optLeft.map(left -> new TypedExpression(opSpec.getExpression(ruleContext, transformedToPointFree, left, this), left.getType()).setStatic(opSpec.isStatic()).setLeft(left));
    }
    if (drlxExpr instanceof ArrayAccessExpr) {
        final ArrayAccessExpr arrayAccessExpr = (ArrayAccessExpr) drlxExpr;
        if (Map.class.isAssignableFrom(typeCursor)) {
            return createMapAccessExpression(arrayAccessExpr.getIndex(), arrayAccessExpr.getName() instanceof ThisExpr ? new NameExpr(THIS_PLACEHOLDER) : arrayAccessExpr.getName(), Map.class);
        } else if (arrayAccessExpr.getName() instanceof FieldAccessExpr) {
            Optional<TypedExpression> typedExpression = toTypedExpressionFromMethodCallOrField(drlxExpr).getTypedExpression();
            typedExpression.ifPresent(te -> {
                final Expression originalExpression = te.getExpression();
                DrlxParseUtil.removeRootNode(originalExpression);
            });
            return typedExpression;
        } else {
            String name = printNode(drlxExpr.asArrayAccessExpr().getName());
            final Optional<TypedExpression> nameExpr = nameExpr(name, typeCursor);
            Expression indexExpr = toTypedExpressionFromMethodCallOrField(arrayAccessExpr.getIndex()).getTypedExpression().orElseThrow(() -> new NoSuchElementException("TypedExpressionResult doesn't contain TypedExpression!")).getExpression();
            return nameExpr.flatMap(te -> transformToArrayOrMapExpressionWithType(indexExpr, te));
        }
    }
    if (drlxExpr instanceof InstanceOfExpr) {
        InstanceOfExpr instanceOfExpr = (InstanceOfExpr) drlxExpr;
        ruleContext.addInlineCastType(printNode(instanceOfExpr.getExpression()), instanceOfExpr.getType());
        return toTypedExpressionRec(instanceOfExpr.getExpression()).map(e -> new TypedExpression(new InstanceOfExpr(e.getExpression(), instanceOfExpr.getType()), boolean.class));
    }
    if (drlxExpr instanceof ClassExpr) {
        return of(new TypedExpression(drlxExpr, Class.class));
    }
    if (drlxExpr instanceof InlineCastExpr) {
        return toTypedExpressionFromMethodCallOrField(drlxExpr).getTypedExpression();
    }
    if (drlxExpr instanceof OOPathExpr) {
        Class<?> type = patternType;
        for (OOPathChunk chunk : ((OOPathExpr) drlxExpr).getChunks()) {
            final String fieldName = chunk.getField().toString();
            final TypedExpression callExpr = DrlxParseUtil.nameExprToMethodCallExpr(fieldName, type, null, ruleContext);
            if (callExpr == null) {
                return empty();
            }
            Class<?> fieldType = (chunk.getInlineCast() != null) ? DrlxParseUtil.getClassFromContext(ruleContext.getTypeResolver(), chunk.getInlineCast().toString()) : callExpr.getRawClass();
            if (!chunk.isSingleValue() && Iterable.class.isAssignableFrom(fieldType) || isDataSource(fieldType)) {
                type = extractGenericType(type, ((MethodCallExpr) callExpr.getExpression()).getName().toString());
            } else {
                type = fieldType;
            }
        }
        return of(new TypedExpression(drlxExpr, type));
    }
    if (drlxExpr.isAssignExpr()) {
        AssignExpr assignExpr = drlxExpr.asAssignExpr();
        final Expression rightSide = assignExpr.getValue();
        return toTypedExpressionRec(rightSide).map(e -> {
            final AssignExpr newExpression = new AssignExpr(assignExpr.getTarget(), e.getExpression(), assignExpr.getOperator());
            return new TypedExpression(newExpression, e.getType());
        });
    }
    throw new UnsupportedOperationException();
}
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Aggregations

Node (com.github.javaparser.ast.Node)1 NodeList (com.github.javaparser.ast.NodeList)1 NodeList.nodeList (com.github.javaparser.ast.NodeList.nodeList)1 InitializerDeclaration (com.github.javaparser.ast.body.InitializerDeclaration)1 ArrayAccessExpr (com.github.javaparser.ast.expr.ArrayAccessExpr)1 ArrayCreationExpr (com.github.javaparser.ast.expr.ArrayCreationExpr)1 ArrayInitializerExpr (com.github.javaparser.ast.expr.ArrayInitializerExpr)1 AssignExpr (com.github.javaparser.ast.expr.AssignExpr)1 BinaryExpr (com.github.javaparser.ast.expr.BinaryExpr)1 CastExpr (com.github.javaparser.ast.expr.CastExpr)1 CharLiteralExpr (com.github.javaparser.ast.expr.CharLiteralExpr)1 ClassExpr (com.github.javaparser.ast.expr.ClassExpr)1 DoubleLiteralExpr (com.github.javaparser.ast.expr.DoubleLiteralExpr)1 EnclosedExpr (com.github.javaparser.ast.expr.EnclosedExpr)1 Expression (com.github.javaparser.ast.expr.Expression)1 FieldAccessExpr (com.github.javaparser.ast.expr.FieldAccessExpr)1 InstanceOfExpr (com.github.javaparser.ast.expr.InstanceOfExpr)1 LiteralExpr (com.github.javaparser.ast.expr.LiteralExpr)1 MethodCallExpr (com.github.javaparser.ast.expr.MethodCallExpr)1 NameExpr (com.github.javaparser.ast.expr.NameExpr)1