| /* |
| * 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.samza.operators.spec; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import org.apache.samza.context.Context; |
| import org.apache.samza.operators.functions.FlatMapFunction; |
| import org.apache.samza.operators.functions.MapFunction; |
| import org.apache.samza.operators.functions.ScheduledFunction; |
| import org.apache.samza.operators.functions.WatermarkFunction; |
| |
| |
| /** |
| * The spec for an operator that transforms each input message to a single output message. |
| * |
| * @param <M> type of input message |
| * @param <OM> type of output messages |
| */ |
| class MapOperatorSpec<M, OM> extends StreamOperatorSpec<M, OM> { |
| |
| private final MapFunction<M, OM> mapFn; |
| |
| MapOperatorSpec(MapFunction<M, OM> mapFn, String opId) { |
| super(new FlatMapFunction<M, OM>() { |
| @Override |
| public Collection<OM> apply(M message) { |
| return new ArrayList<OM>() { |
| { |
| OM r = mapFn.apply(message); |
| if (r != null) { |
| this.add(r); |
| } |
| } |
| }; |
| } |
| |
| @Override |
| public void init(Context context) { |
| mapFn.init(context); |
| } |
| |
| @Override |
| public void close() { |
| mapFn.close(); |
| } |
| }, OpCode.MAP, opId); |
| this.mapFn = mapFn; |
| } |
| |
| @Override |
| public WatermarkFunction getWatermarkFn() { |
| return this.mapFn instanceof WatermarkFunction ? (WatermarkFunction) this.mapFn : null; |
| } |
| |
| @Override |
| public ScheduledFunction getScheduledFn() { |
| return this.mapFn instanceof ScheduledFunction ? (ScheduledFunction) this.mapFn : null; |
| } |
| } |