| /** |
| * 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.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 final String fieldName; |
| |
| private TupleFieldTimestampExtractor(String fieldName) { |
| this.fieldName = fieldName; |
| } |
| |
| public static TupleFieldTimestampExtractor of(String fieldName) { |
| return new TupleFieldTimestampExtractor(fieldName); |
| } |
| |
| @Override |
| public long extractTimestamp(Tuple tuple) { |
| return tuple.getLongByField(fieldName); |
| } |
| |
| @Override |
| public String toString() { |
| return "TupleFieldTimestampExtractor{" |
| + "fieldName='" + fieldName + '\'' |
| + '}'; |
| } |
| } |