class DerivedSet - base set + additions [1018030]

< > BotCompany Repo | #1018030 // class DerivedSet - base set + additions

JavaX fragment (include)

static class DerivedSet<A> extends AbstractSet<A> {
  Set<A> base;
  Set<A> additions = new HashSet;
  
  *() {}
  *(Set<A> *base) {}
  *(Set<A> *base, Set<A> *additions) {}
  
  public int size() { ret base.size()+additions.size(); }
  public Iterator<A> iterator() { fail(); }
  public bool contains(O o) { ret base.contains(o) || additions.contains(o); }
  
  public bool add(A a) {
    ret !base.contains(a) && additions.add(a);
  }
  
  // does not remove from base set, only from additions
  public bool remove(O o) { ret additions.remove(o); }
  
  O mutex() { ret collectionMutex(additions); }
}

Author comment

Began life as a copy of #1017455

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Snippet ID:

#1018030

Snippet name:

class DerivedSet - base set + additions

Eternal ID of this version:

#1018030/1

Text MD5:

ffc89bfbc9eff27dd14960a78340e907

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2018-08-26 17:20:19

Source code size:

625 bytes / 21 lines

Pitched / IR pitched:

No / No

Views / Downloads:

369 / 907

Referenced in:

[show references]

1	static class DerivedSet<A> extends AbstractSet<A> {
2	Set<A> base;
3	Set<A> additions = new HashSet;
4
5	*() {}
6	(Set<A> base) {}
7	(Set<A> base, Set<A> *additions) {}
8
9	public int size() { ret base.size()+additions.size(); }
10	public Iterator<A> iterator() { fail(); }
11	public bool contains(O o) { ret base.contains(o) \|\| additions.contains(o); }
12
13	public bool add(A a) {
14	ret !base.contains(a) && additions.add(a);
15	}
16
17	// does not remove from base set, only from additions
18	public bool remove(O o) { ret additions.remove(o); }
19
20	O mutex() { ret collectionMutex(additions); }
21	}