how to simply get a field in a java Map hierarchy?

Question

Suppose I have a java.util.Map named rootMap. rootMap["level1"] is another Map (let's call it map1) map1["level2] is another Map etc...In short words, I have a Map hierarchy.

My need : simply and directly get a deep field with a short API like : get(rootMap, "level1.level2.field") I thought leveraging Dozer but does something simpler exist ? Thanks !

I think you should write your own method to do it step by step. J — Antony Dao, Nov 23 '16 at 10:15
ok, I know that, I just wanted no know if a simple library would do that for me. — user1458153, Nov 23 '16 at 13:14

score 2 · Answer 1 · answered Nov 23 '16 at 10:15

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If you have a map of maps

HashMap<String, HashMap<String, String>> outerMap = new HashMap<String, HashMap<String, String>>();

You can access some inner map by

outerMap.get("inner map key");

And to get a value of inner map you do

outerMap.get("inner map key").get("the key");

So, as you can see, you have to pipe calls to Map.get in order to get inner maps.

answered Nov 23 '16 at 10:15

Gabriel

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ok, I know that, I just wanted no know if a simple library would do that for me. – user1458153 Nov 23 '16 at 13:14

score 0 · Answer 2 · edited May 23 '17 at 12:30

0

I actually need a Map2POJO mapping, so I finally used Dozer to do that, as previously suggested in Dozer, how to map from java.util.Map to complex type?

edited May 23 '17 at 12:30

Community

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answered Nov 23 '16 at 13:16

user1458153

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how to simply get a field in a java Map hierarchy?

2 Answers2