What's the simplest and most elegant way to serialize an array of
JSON objects into a Java map with jackson?
I've just used the jackson deserializer by creating beans matching the
JSON objects to be deserialized.
Ie. this
{
"id": "something",
"year": 2016,
"items": [
{
"id": "something_else",
"amount": 123445,
"specification": "something"
}
]
}
Into
public class TopLevel {
private String id;
private int year;
private List<Item> items;
// + public getters for all fields
}
and
public class Item {
private String id;
private long amount;
private String specification;
}
When I started to use the parsed objects I quickly found out that I
would prefer TopLevel.items to be a Map<String,Item>, keyed on the
Item.id values, instead of a List<Item>.
So I googled "serializing JSON array into map with Jackson", and got
answers... but they seemed awfully complicated compared to the existing
configuration-free parsing.
So I rewrote the TopLevel.getItems() method to return Map<String,Item>,
added a Map<String,Item> field with lazy initialization.
Ie. the pragmatic solution, and I can live fine with the pragmatic
solution.
But if there is a more elegant and correct jacksonian way of
deserializing the array directly into a map I could switch to that.
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