| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| package org.apache.tinkerpop.gremlin.process.traversal.step.util; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class MapHelper { |
| |
| private MapHelper() { |
| } |
| |
| public static <T> void incr(final Map<T, Long> map, final T key, final Long value) { |
| map.put(key, value + map.getOrDefault(key, 0l)); |
| } |
| |
| public static <T> void incr(final Map<T, Double> map, final T key, final Double value) { |
| map.put(key, value + map.getOrDefault(key, 0.0d)); |
| } |
| |
| public static <T, U> void incr(final Map<T, List<U>> map, final T key, final U value) { |
| map.compute(key, (k, v) -> { |
| if (null == v) v = new ArrayList<>(); |
| v.add(value); |
| return v; |
| }); |
| } |
| } |