OneMap - exactly one-element map, immutable [1030858]

< > BotCompany Repo | #1030858 // OneMap - exactly one-element map, immutable

JavaX fragment (include) [tags: use-pretranspiled]

sclass OneMap<A, B> extends CompactAbstractMap<A, B> {
  A key;
  B value;
  
  *() {}
  *(A *key, B *value) {}
  *(Map<A, B> map) {
    Iterator<Map.Entry<A, B>> it = map.entrySet().iterator();
    Map.Entry<A, B> e = it.next();
    key = e.getKey();
    value = e.getValue();
    assertFalse(it.hasNext());
  }
  
  public int size() { ret 1; }
  public Set<Map.Entry<A, B>> entrySet() {
    ret litset(simpleMapEntry(key, value));
  }
  
  public bool containsKey(O o) {
    ret isKey(o);
  }
  
  bool isKey(O o) { ret eq(o, key); }
  
  @Override
  public B get(O o) {
    ret isKey(o) ?  value : null;
  }
}

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Snippet ID:

#1030858

Snippet name:

OneMap - exactly one-element map, immutable

Eternal ID of this version:

#1030858/7

Text MD5:

896657788fe68cc806df55fff3d51eb2

Transpilation MD5:

945556a737c936e7735b2439c4af14b8

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2021-04-25 23:01:54

Source code size:

642 bytes / 30 lines

Pitched / IR pitched:

No / No

Views / Downloads:

132 / 329

Version history:

6 change(s)

Referenced in:

[show references]

1	sclass OneMap<A, B> extends CompactAbstractMap<A, B> {
2	A key;
3	B value;
4
5	*() {}
6	(A key, B *value) {}
7	*(Map<A, B> map) {
8	Iterator<Map.Entry<A, B>> it = map.entrySet().iterator();
9	Map.Entry<A, B> e = it.next();
10	key = e.getKey();
11	value = e.getValue();
12	assertFalse(it.hasNext());
13	}
14
15	public int size() { ret 1; }
16	public Set<Map.Entry<A, B>> entrySet() {
17	ret litset(simpleMapEntry(key, value));
18	}
19
20	public bool containsKey(O o) {
21	ret isKey(o);
22	}
23
24	bool isKey(O o) { ret eq(o, key); }
25
26	@Override
27	public B get(O o) {
28	ret isKey(o) ? value : null;
29	}
30	}