Filter products by category and price range

ProductResource.java

@RequestMapping("")
    public List<Product> filterProducts(@Param("category") final Optional<String> category,
                                        @Param("lower-price-limit") final Optional<Double> lowerLimitPrice,
                                        @RequestParam("upper-price-limit") final Optional<Double> upperLimitPrice ) {


        return productRepos.findAll().stream().
                filter(p -> {
                    if (category.isEmpty()) {
                        return true;
                    }
                    return category.get().equals(p.getCategory());
                }).
                filter(p -> {
                    if (lowerLimitPrice.isEmpty()) {
                        return true;
                    }
                    return lowerLimitPrice.get() < p.getPrice();
                }).
                filter(p -> {
                    if (upperLimitPrice.isEmpty()) {
                        return true;
                    }
                    return upperLimitPrice.get() > p.getPrice();
                }).
                map(p -> {
                        return new Product(p.getId(), p.getName(), p.getPrice(), p.getCategory());
                    }
                ).collect(Collectors.toList());
    }