1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017 Amdocs
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*/
package org.openecomp.datarouter.util;
import java.util.ArrayList;
import java.util.List;
public class SearchSuggestionPermutation {
/*
* Will return all the unique combinations of the suggestions provided.
* The order of the permutation is not taken into account when computing
* the uniqueness.
* e.g.: A list of A,B,C,D will return
* [[A], [A, B, C, D], [A, C, D], [A, D], [B], [B, C, D], [B, D], [C], [C, D], [D]]
*
* @param list The list of statuses to create permutations of
* @return A list which contains a array list of all possible combinations
*/
public static ArrayList<ArrayList<String>> getUniqueListForSuggestions(
List<String> originalList) {
ArrayList<ArrayList<String>> lists = new ArrayList<ArrayList<String>>();
if (originalList.isEmpty()) {
lists.add(new ArrayList<String>());
return lists;
}
List<String> list = new ArrayList<String>(originalList);
String head = list.get(0);
ArrayList<String> rest = new ArrayList<String>(list.subList(1, list.size()));
for (ArrayList<String> activeList : getUniqueListForSuggestions(rest)) {
ArrayList<String> newList = new ArrayList<String>();
newList.add(head);
newList.addAll(activeList);
lists.add(newList);
lists.add(activeList);
}
return lists;
}
public static ArrayList<ArrayList<String>> getNonEmptyUniqueLists(List<String> list){
ArrayList<ArrayList<String>> lists = getUniqueListForSuggestions(list);
// remove empty list from the power set
for (ArrayList<String> emptyList : lists ){
if ( emptyList.isEmpty() ) {
lists.remove(emptyList);
break;
}
}
return lists;
}
public static List<List<String>> getListPermutations(List<String> list) {
List<String> inputList = new ArrayList<String>();
inputList.addAll(list);
if (inputList.size() == 0) {
List<List<String>> result = new ArrayList<List<String>>();
result.add(new ArrayList<String>());
return result;
}
List<List<String>> listOfLists = new ArrayList<List<String>>();
String firstElement = inputList.remove(0);
List<List<String>> recursiveReturn = getListPermutations(inputList);
for (List<String> li : recursiveReturn) {
for (int index = 0; index <= li.size(); index++) {
List<String> temp = new ArrayList<String>(li);
temp.add(index, firstElement);
listOfLists.add(temp);
}
}
return listOfLists;
}
}
|
