| /* |
| * 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.cassandra.locator; |
| |
| import java.util.AbstractMap; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.stream.Stream; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Iterables; |
| |
| @VisibleForTesting |
| public abstract class ReplicaMultimap<K, C extends ReplicaCollection<?>> |
| { |
| final Map<K, C> map; |
| ReplicaMultimap(Map<K, C> map) |
| { |
| this.map = map; |
| } |
| |
| public abstract C get(K key); |
| |
| public static abstract class Builder |
| <K, B extends ReplicaCollection.Builder<?>> |
| |
| { |
| protected abstract B newBuilder(K key); |
| |
| final Map<K, B> map; |
| Builder() |
| { |
| this.map = new HashMap<>(); |
| } |
| |
| public B get(K key) |
| { |
| Preconditions.checkNotNull(key); |
| return map.computeIfAbsent(key, k -> newBuilder(key)); |
| } |
| |
| public B getIfPresent(K key) |
| { |
| Preconditions.checkNotNull(key); |
| return map.get(key); |
| } |
| |
| public void put(K key, Replica replica) |
| { |
| Preconditions.checkNotNull(key); |
| Preconditions.checkNotNull(replica); |
| get(key).add(replica); |
| } |
| } |
| |
| public Iterable<Replica> flattenValues() |
| { |
| return Iterables.concat(map.values()); |
| } |
| |
| public Iterable<Map.Entry<K, Replica>> flattenEntries() |
| { |
| return () -> { |
| Stream<Map.Entry<K, Replica>> s = map.entrySet() |
| .stream() |
| .flatMap(entry -> entry.getValue() |
| .stream() |
| .map(replica -> (Map.Entry<K, Replica>)new AbstractMap.SimpleImmutableEntry<>(entry.getKey(), replica))); |
| return s.iterator(); |
| }; |
| } |
| |
| public boolean isEmpty() |
| { |
| return map.isEmpty(); |
| } |
| |
| public boolean containsKey(Object key) |
| { |
| return map.containsKey(key); |
| } |
| |
| public Set<K> keySet() |
| { |
| return map.keySet(); |
| } |
| |
| public Set<Map.Entry<K, C>> entrySet() |
| { |
| return map.entrySet(); |
| } |
| |
| public Map<K, C> asMap() |
| { |
| return map; |
| } |
| |
| public boolean equals(Object o) |
| { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| ReplicaMultimap<?, ?> that = (ReplicaMultimap<?, ?>) o; |
| return Objects.equals(map, that.map); |
| } |
| |
| public int hashCode() |
| { |
| return map.hashCode(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return map.toString(); |
| } |
| } |