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// allows null keys but not null values static <A, B> B getOrCreate(Map<A, B> map, A key, Class<? extends B> c) ctex { B b = map.get(key); if (b == null) map.put(key, b = c.newInstance()); ret b; } // f : func -> B static <A, B> B getOrCreate(Map<A, B> map, A key, O f) ctex { B b = map.get(key); if (b == null) map.put(key, b = (B) callF(f)); ret b; } static <A, B> B getOrCreate(IF0<B> f, Map<A, B> map, A key) { ret getOrCreate(map, key, f); } static <A, B> B getOrCreate(Map<A, B> map, A key, IF0<B> f) { B b = map.get(key); if (b == null) map.put(key, b = f!); ret b; } static <A, B> B nuLike getOrCreate(Class<? extends B> c, Map<A, B> map, A key) { ret getOrCreate(map, key, c); }
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Snippet ID: | #1013935 |
Snippet name: | getOrCreate - map lookup or create from class |
Eternal ID of this version: | #1013935/12 |
Text MD5: | c8e1aa1765798e0d379e4436ee7d2d1e |
Transpilation MD5: | ab872c665638ad04b8f3adce12cfa3e4 |
Author: | stefan |
Category: | javax |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2021-07-23 19:36:39 |
Source code size: | 756 bytes / 31 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 566 / 671 |
Version history: | 11 change(s) |
Referenced in: | [show references] |