[jira] [Created] (COLLECTIONS-707) New collection type: PrefixMap

["Niels Basjes (JIRA)" <ji...@apache.org>]

Niels Basjes created COLLECTIONS-707:
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             Summary: New collection type: PrefixMap
                 Key: COLLECTIONS-707
                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-707
             Project: Commons Collections
          Issue Type: Improvement
            Reporter: Niels Basjes


I was working on a project ( https://github.com/nielsbasjes/yauaa ) where I ran into the situation that I needed a type of collection that was not yet present in either Java or commons-collections.

So I wrote my own implementation and I think this may be a useful addition to commons-collections.

At this point we have
- the Map that allows retrieval of a single value based on an exact key.
- the Trie that allows retrieval of a set of values based where the keys all start with the same prefix.

What I needed a structure where it holds the prefixes and associated values and I want to retrieve the 'best matching prefix' for a given input.


To illustrate what I mean using the original use case:
PrefixMap<String> prefixMap = new ASCIIPrefixMap<>(false); // false == match case insensitive
prefixMap.put("SM-", "Samsung");
prefixMap.put("Mi-", "Xiaomi");
prefixMap.getLongestMatch("SM-1234"); // ---> "Samsung"



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