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/**
* ============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.sparky.util;
import java.util.ArrayList;
import java.util.List;
public class SuggestionsPermutation {
/*
* Will return all the unique combinations of the suggestions provided.
* The order of the permutation is not taken into account when computing
* the uniqueness.
* eg: 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 to create the unique permutations
* @return A Arraylist which contains a array list of all possible combinations
*/
@SuppressWarnings("serial")
public ArrayList<ArrayList<String>> getSuggestionsPermutation(List<String> list) {
List<String> statusList = new ArrayList<>(list);
List<String> dupStatusList;
ArrayList<ArrayList<String>> uniqueList = new ArrayList<ArrayList<String>>();
int mainLoopIndexCounter = 0;
for (String status : statusList) {
// Add the single entity subset
uniqueList.add(new ArrayList<String>() {
{
add(status);
}
});
// Remove all the elements to left till the current index
dupStatusList = truncateListUntill(statusList, mainLoopIndexCounter);
while (dupStatusList.size() > 0) {
ArrayList<String> suggListInIterate= new ArrayList<>();
suggListInIterate.add(status);
for (String dupStatus : dupStatusList) {
suggListInIterate.add(dupStatus);
}
uniqueList.add(suggListInIterate);
dupStatusList.remove(0);
}
mainLoopIndexCounter++;
}
return uniqueList;
}
private List<String> truncateListUntill(List<String> lists, int index) {
List<String> truncatedList = new ArrayList<>(lists);
int counter = 0;
while (counter <= index) {
truncatedList.remove(0);
counter++;
}
return truncatedList;
}
}
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