| /* |
| * 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.beam.runners.core; |
| |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.transforms.Materializations; |
| import org.apache.beam.sdk.transforms.Materializations.MultimapView; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ArrayListMultimap; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Multimap; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Multimaps; |
| |
| /** An in-memory representation of {@link MultimapView}. */ |
| public class InMemoryMultimapSideInputView<K, V> implements Materializations.MultimapView<K, V> { |
| |
| /** |
| * Creates a {@link MultimapView} from the provided values. The provided {@link Coder} is used to |
| * guarantee structural equality for keys instead of assuming Java object equality. |
| */ |
| public static <K, V> MultimapView<K, V> fromIterable( |
| Coder<K> keyCoder, Iterable<KV<K, V>> values) { |
| // We specifically use an array list multimap to allow for: |
| // * null keys |
| // * null values |
| // * duplicate values |
| Multimap<Object, Object> multimap = ArrayListMultimap.create(); |
| for (KV<K, V> value : values) { |
| multimap.put(keyCoder.structuralValue(value.getKey()), value.getValue()); |
| } |
| return new InMemoryMultimapSideInputView(keyCoder, Multimaps.unmodifiableMultimap(multimap)); |
| } |
| |
| private final Coder<K> keyCoder; |
| private final Multimap<Object, V> structuralKeyToValuesMap; |
| |
| private InMemoryMultimapSideInputView(Coder<K> keyCoder, Multimap<Object, V> data) { |
| this.keyCoder = keyCoder; |
| this.structuralKeyToValuesMap = data; |
| } |
| |
| @Override |
| public Iterable<V> get(K k) { |
| return structuralKeyToValuesMap.get(keyCoder.structuralValue(k)); |
| } |
| } |