Splitter2 - sorts things in many categories, collects examples with occurrence count [1009691]

< > BotCompany Repo | #1009691 // Splitter2 - sorts things in many categories, collects examples with occurrence count

JavaX fragment (include)

sclass Splitter2<A, B> {
  HashMap<A, MultiSet<B>> map = new HashMap;

  // may return null if unknown
  B get(A a) {
    MultiSet<B> ms = map.get(a);
    ret ms == null ? null : ms.getMostPopularEntry();
  }
  
  void learn(A a, B b) {
    MultiSet<B> ms = map.get(a);
    if (ms == null) map.put(a, ms = new MultiSet);
    ms.add(internIfString(b));
  }
  
  void unlearn(A a, B b) {
    MultiSet<B> ms = map.get(a);
    if (ms == null) ret;
    ms.remove(b);
    if (empty(ms)) map.remove(a);
  }
  
  void clear { map.clear(); }
}

Author comment

Began life as a copy of #1009690

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Snippet ID:

#1009691

Snippet name:

Splitter2 - sorts things in many categories, collects examples with occurrence count

Eternal ID of this version:

#1009691/4

Text MD5:

c6793c59ecf9a8004a94451cc784351f

Author:

stefan

Category:

javax / a.i.

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2017-08-14 17:21:38

Source code size:

557 bytes / 24 lines

Pitched / IR pitched:

No / No

Views / Downloads:

453 / 1029

Version history:

3 change(s)

Referenced in:

[show references]

1	sclass Splitter2<A, B> {
2	HashMap<A, MultiSet<B>> map = new HashMap;
3
4	// may return null if unknown
5	B get(A a) {
6	MultiSet<B> ms = map.get(a);
7	ret ms == null ? null : ms.getMostPopularEntry();
8	}
9
10	void learn(A a, B b) {
11	MultiSet<B> ms = map.get(a);
12	if (ms == null) map.put(a, ms = new MultiSet);
13	ms.add(internIfString(b));
14	}
15
16	void unlearn(A a, B b) {
17	MultiSet<B> ms = map.get(a);
18	if (ms == null) ret;
19	ms.remove(b);
20	if (empty(ms)) map.remove(a);
21	}
22
23	void clear { map.clear(); }
24	}