| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.storm.topology; |
| |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.windowing.TimestampExtractor; |
| |
| /** |
| * A {@link TimestampExtractor} that extracts timestamp from a specific field in the tuple. |
| */ |
| public final class TupleFieldTimestampExtractor implements TimestampExtractor { |
| private static final long serialVersionUID = 5212225232807940572L; |
| private final String fieldName; |
| |
| private TupleFieldTimestampExtractor(String fieldName) { |
| this.fieldName = fieldName; |
| } |
| |
| @Override |
| public long extractTimestamp(Tuple tuple) { |
| return tuple.getLongByField(fieldName); |
| } |
| |
| public static TupleFieldTimestampExtractor of(String fieldName) { |
| return new TupleFieldTimestampExtractor(fieldName); |
| } |
| |
| @Override |
| public String toString() { |
| return "TupleFieldTimestampExtractor{" + "fieldName='" + fieldName + '\'' + '}'; |
| } |
| } |