@Test
public void P17_havingEnoughMoney() {
// when
Map<String, Integer> items = shopList.stream()
.map(Shop::getItemList)
.flatMap(List::stream)
.distinct()
.collect(Collectors.toMap(i -> i.getName(), i -> i.getPrice(), (a, b) -> Math.min(a, b)));
final List<String> customerNameList = customerList.stream()
.filter(i -> sum(i.getWantToBuy(), items) <= i.getBudget())
.filter(i -> haveall(i.getWantToBuy(), items))
.map(Customer::getName)
.collect(Collectors.toList());
// then
assertThat(customerNameList).hasSize(8);
assertThat(customerNameList).containsOnly("Joe", "Steven", "Patrick", "Diana", "Kathy", "Alice", "Martin",
"Amy");
}
private Long sum(List<ItemEntry> itemList, Map<String, Integer> priceLookup) {
return itemList.stream()
.collect(Collectors.summingLong(i -> priceLookup.getOrDefault(i.getName(), 0)));
}
private Boolean haveall(List<ItemEntry> itemList, Map<String, Integer> priceLookup) {
return itemList.stream()
.allMatch(i -> priceLookup.containsKey(i.getName()));
}
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