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ProductPrice.java
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| Map<String,Component> components; | |
| public List<String> getComponentNames(String product){ | |
| return productDetails.get(product); | |
| } | |
| //given a product, return the sum of prices of it's components | |
| //if anything fails, return that specific exception | |
| public Either<Exception,Double> getProductPrice(String product){ | |
| return getComponentNames(product) | |
| .stream() | |
| //from product name string, get componenet as Either<Exception,Component> | |
| .map(this::getComponent) | |
| //given an Either<Exception, Component>, return it's price as Either<Exception,Double> | |
| .map(this::getComponentPrice) | |
| //given two Either<Exception,Double> prices, add their prices and make a new Either<Exception,Double> | |
| .reduce((x,y)-> x.bind(xPrice -> y.bind(yPrice -> new Right<>(xPrice + yPrice)))) | |
| //get the final sum of prices as Either<Exception,Double> | |
| .get(); | |
| } |
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