UniqueList - list where each element appears only once [mixture of ArrayList and LinkedHashSet] [1029067]

< > BotCompany Repo | #1029067 // UniqueList - list where each element appears only once [mixture of ArrayList and LinkedHashSet]

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

sclass UniqueList<A> extends RandomAccessAbstractList<A> {
  new L<A> list;
  new Map<A, Int> index; // position of each element
  
  public A get(int i) { ret list.get(i); }
  public int size() { ret list.size(); }
  
  // couldn't come up with a better name here... add element or
  // get its index if it's already there
  int addOrGetIndex(A a) {
    Int i = index.get(a);
    if (i == null) {
      index.put(a, i = size());
      list.add(a);
    }
    ret i;
  }
  
  public bool add(A a) {
    int n = size();
    ret addOrGetIndex(a) == n;
  }
}

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Snippet ID:

#1029067

Snippet name:

UniqueList - list where each element appears only once [mixture of ArrayList and LinkedHashSet]

Eternal ID of this version:

#1029067/4

Text MD5:

3bfe23a6d6a0749311a98e0dec77082f

Transpilation MD5:

2ceb0355fd50cd3aef3d0fe8e32283af

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2020-07-18 23:17:28

Source code size:

576 bytes / 23 lines

Pitched / IR pitched:

No / No

Views / Downloads:

485 / 814

Version history:

3 change(s)

Referenced in:

[show references]

1	sclass UniqueList<A> extends RandomAccessAbstractList<A> {
2	new L<A> list;
3	new Map<A, Int> index; // position of each element
4
5	public A get(int i) { ret list.get(i); }
6	public int size() { ret list.size(); }
7
8	// couldn't come up with a better name here... add element or
9	// get its index if it's already there
10	int addOrGetIndex(A a) {
11	Int i = index.get(a);
12	if (i == null) {
13	index.put(a, i = size());
14	list.add(a);
15	}
16	ret i;
17	}
18
19	public bool add(A a) {
20	int n = size();
21	ret addOrGetIndex(a) == n;
22	}
23	}