Java Map Merge mergeListWithMap(List from, Map to)

Description

merge List With Map

License

Open Source License

Declaration

public static Map<Integer, Integer> mergeListWithMap(List<Integer> from, Map<Integer, Integer> to) 

Method Source Code

//package com.java2s;
/*/*from w w w .  j  a v a 2  s .  c o  m*/
 TagRecommender:
 A framework to implement and evaluate algorithms for the recommendation
 of tags.
 Copyright (C) 2013 Dominik Kowald
     
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as
 published by the Free Software Foundation, either version 3 of the
 License, or (at your option) any later version.
     
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Affero General Public License for more details.
     
 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.List;
import java.util.Map;

public class Main {
    public static Map<Integer, Integer> mergeListWithMap(List<Integer> from, Map<Integer, Integer> to) {
        for (Integer value : from) {
            Integer count = to.get(value);
            to.put(value, (count != null ? count + 1 : 1));
        }
        return to;
    }
}

Related

1. mergeEnvironmentVariables(Map environmentSource, Map environmentDestination, String environmentVariable)
2. mergeFamilies(Map familySource, Map familyTarget)
3. mergeFixedValueConditions(Map> left, Map> right)
4. mergeIfAbsent(Map map, Map toMerge)
5. mergeImportedPermissionsWithExistingPermissions( Map> existingRoleIdsToActionIds, Map importedRoleIdsToActionIds)
6. mergeMap(Map map, Object[]... pairs)
7. mergeMap(Map primaryValues, Map defaultValues)
8. mergeMap(Map first, Map second)
9. mergeMapIntoMap(Map> source, Map> destination)