| // Copyright (C) 2022 The Android Open Source Project |
| // |
| // 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. |
| |
| package com.googlesource.gerrit.plugins.task; |
| |
| import static java.util.stream.Collectors.toList; |
| |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.function.BiFunction; |
| import java.util.function.Function; |
| |
| public class HitHashMap<K, V> extends HashMap<K, V> implements StatisticsMap<K, V> { |
| public static class Statistics { |
| public long hits; |
| public int size; |
| public List<Object> elements; |
| } |
| |
| public static final long serialVersionUID = 1; |
| |
| protected Statistics statistics; |
| |
| public HitHashMap() {} |
| |
| public HitHashMap(boolean initStatistics) { |
| if (initStatistics) { |
| initStatistics(); |
| } |
| } |
| |
| @Override |
| public V get(Object key) { |
| V v = super.get(key); |
| if (statistics != null && v != null) { |
| statistics.hits++; |
| } |
| return v; |
| } |
| |
| @Override |
| public V getOrDefault(Object key, V dv) { |
| V v = get(key); |
| if (v == null) { |
| return dv; |
| } |
| return v; |
| } |
| |
| @Override |
| public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) { |
| V v = get(key); |
| if (v == null) { |
| v = mappingFunction.apply(key); |
| if (v != null) { |
| put(key, v); |
| } |
| } |
| return v; |
| } |
| |
| @Override |
| public V put(K key, V value) { |
| if (statistics != null && value instanceof TracksStatistics) { |
| ((TracksStatistics) value).ensureStatistics(); |
| } |
| return super.put(key, value); |
| } |
| |
| @Override |
| public void putAll(Map<? extends K, ? extends V> m) { |
| m.entrySet().stream().forEach(e -> put(e.getKey(), e.getValue())); |
| } |
| |
| @Override |
| public V putIfAbsent(K key, V value) { |
| if (!containsKey(key)) { |
| put(key, value); |
| return null; |
| } |
| return get(key); |
| } |
| |
| @Override |
| public V computeIfPresent( |
| K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { |
| throw new UnsupportedOperationException(); // Todo if needed |
| } |
| |
| @Override |
| public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { |
| throw new UnsupportedOperationException(); // Todo if needed |
| } |
| |
| @Override |
| public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) { |
| throw new UnsupportedOperationException(); // Todo if needed |
| } |
| |
| @Override |
| public V replace(K key, V value) { |
| throw new UnsupportedOperationException(); // Todo if needed |
| } |
| |
| @Override |
| public boolean replace(K key, V oldValue, V newValue) { |
| throw new UnsupportedOperationException(); // Todo if needed |
| } |
| |
| @Override |
| public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) { |
| throw new UnsupportedOperationException(); // Todo if needed |
| } |
| |
| @Override |
| public void initStatistics() { |
| statistics = new Statistics(); |
| } |
| |
| @Override |
| public void ensureStatistics() { |
| if (statistics == null) { |
| initStatistics(); |
| } |
| } |
| |
| @Override |
| public Object getStatistics() { |
| statistics.size = size(); |
| List<Object> elementStatistics = |
| values().stream() |
| .filter(e -> e instanceof TracksStatistics) |
| .map(e -> ((TracksStatistics) e).getStatistics()) |
| .collect(toList()); |
| if (!elementStatistics.isEmpty()) { |
| statistics.elements = elementStatistics; |
| } |
| return statistics; |
| } |
| } |