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1 | // get() works as expected (calculating the element on demand). |
2 | // containsKey(), entrySet(), size() etc. only refer to the elements |
3 | // already made. |
4 | // Also allows put(). |
5 | // Not synchronized |
6 | sclass AutoMap<A, B> extends AbstractMap<A, B> {
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7 | Map<A, B> map = new HashMap; |
8 | IF1<A, B> f; |
9 | |
10 | *() {}
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11 | *(IF1<A, B> *f) {}
|
12 | *(IF0<B> f) { this.f = if0ToIF1(f); }
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13 | *(Class<B> c) { this.f = a -> nu(c); }
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14 | |
15 | public B get(O a) {
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16 | if (map.containsKey(a)) |
17 | ret map.get(a); |
18 | cast a to A; |
19 | B b = f.get(a); |
20 | map.put(a, b); |
21 | ret b; |
22 | } |
23 | |
24 | // unclear semantics |
25 | public bool containsKey(O a) {
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26 | ret map.containsKey(a); |
27 | } |
28 | |
29 | public Set<Map.Entry<A, B>> entrySet() {
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30 | ret map.entrySet(); |
31 | } |
32 | |
33 | public int size() { ret map.size(); }
|
34 | |
35 | public B put(A a, B b) {
|
36 | ret map.put(a, b); |
37 | } |
38 | } |
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| Snippet ID: | #1008575 |
| Snippet name: | AutoMap - map with automatic element creation |
| Eternal ID of this version: | #1008575/18 |
| Text MD5: | 411501a882e32e3955287e27c05ee205 |
| Transpilation MD5: | ee36378d9a01f080d6df2929d71cb9fd |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2021-10-29 02:08:09 |
| Source code size: | 850 bytes / 38 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 640 / 2166 |
| Version history: | 17 change(s) |
| Referenced in: | [show references] |