| /* |
| * 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.utils; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.RandomAccess; |
| import java.util.Set; |
| import java.util.function.IntFunction; |
| |
| import com.google.common.collect.Maps; |
| import com.google.common.collect.Sets; |
| |
| import org.apache.cassandra.db.TypeSizes; |
| import org.apache.cassandra.io.IVersionedSerializer; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| |
| public class CollectionSerializer |
| { |
| |
| public static <V> void serializeCollection(IVersionedSerializer<V> valueSerializer, Collection<V> values, DataOutputPlus out, int version) throws IOException |
| { |
| out.writeUnsignedVInt(values.size()); |
| for (V value : values) |
| valueSerializer.serialize(value, out, version); |
| } |
| |
| public static <V, L extends List<V> & RandomAccess> void serializeList(IVersionedSerializer<V> valueSerializer, L values, DataOutputPlus out, int version) throws IOException |
| { |
| int size = values.size(); |
| out.writeUnsignedVInt(size); |
| for (int i = 0 ; i < size ; ++i) |
| valueSerializer.serialize(values.get(i), out, version); |
| } |
| |
| public static <K, V> void serializeMap(IVersionedSerializer<K> keySerializer, IVersionedSerializer<V> valueSerializer, Map<K, V> map, DataOutputPlus out, int version) throws IOException |
| { |
| out.writeUnsignedVInt(map.size()); |
| for (Map.Entry<K, V> e : map.entrySet()) |
| { |
| keySerializer.serialize(e.getKey(), out, version); |
| valueSerializer.serialize(e.getValue(), out, version); |
| } |
| } |
| |
| public static <V, C extends Collection<? super V>> C deserializeCollection(IVersionedSerializer<V> serializer, IntFunction<C> factory, DataInputPlus in, int version) throws IOException |
| { |
| int size = (int) in.readUnsignedVInt(); |
| C result = factory.apply(size); |
| while (size-- > 0) |
| result.add(serializer.deserialize(in, version)); |
| return result; |
| } |
| |
| public static <K, V, M extends Map<K, V>> M deserializeMap(IVersionedSerializer<K> keySerializer, IVersionedSerializer<V> valueSerializer, IntFunction<M> factory, DataInputPlus in, int version) throws IOException |
| { |
| int size = (int) in.readUnsignedVInt(); |
| M result = factory.apply(size); |
| while (size-- > 0) |
| { |
| K key = keySerializer.deserialize(in, version); |
| V value = valueSerializer.deserialize(in, version); |
| result.put(key, value); |
| } |
| return result; |
| } |
| |
| public static <V> long serializedSizeCollection(IVersionedSerializer<V> valueSerializer, Collection<V> values, int version) |
| { |
| long size = TypeSizes.sizeofUnsignedVInt(values.size()); |
| for (V value : values) |
| size += valueSerializer.serializedSize(value, version); |
| return size; |
| } |
| |
| public static <V, L extends List<V> & RandomAccess> long serializedSizeList(IVersionedSerializer<V> valueSerializer, L values, int version) throws IOException |
| { |
| int items = values.size(); |
| long size = TypeSizes.sizeofUnsignedVInt(items); |
| for (int i = 0 ; i < items ; ++i) |
| size += valueSerializer.serializedSize(values.get(i), version); |
| return size; |
| } |
| |
| |
| public static <K, V> long serializedSizeMap(IVersionedSerializer<K> keySerializer, IVersionedSerializer<V> valueSerializer, Map<K, V> map, int version) |
| { |
| long size = TypeSizes.sizeofUnsignedVInt(map.size()); |
| for (Map.Entry<K, V> e : map.entrySet()) |
| size += keySerializer.serializedSize(e.getKey(), version) |
| + valueSerializer.serializedSize(e.getValue(), version); |
| return size; |
| } |
| |
| public static <V> IntFunction<Set<V>> newHashSet() |
| { |
| return i -> i == 0 ? Collections.emptySet() : Sets.newHashSetWithExpectedSize(i); |
| } |
| |
| public static <K, V> IntFunction<Map<K, V>> newHashMap() |
| { |
| return i -> i == 0 ? Collections.emptyMap() : Maps.newHashMapWithExpectedSize(i); |
| } |
| |
| } |