| // Copyright 2017 Twitter. All rights reserved. |
| // |
| // Licensed 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 com.twitter.heron.api.windowing; |
| |
| import com.twitter.heron.api.tuple.Tuple; |
| |
| /** |
| * A {@link TimestampExtractor} that extracts timestamp from a specific field in the tuple. |
| */ |
| public final class TupleFieldTimestampExtractor implements TimestampExtractor { |
| private static final long serialVersionUID = 6302970084936569305L; |
| 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 + '\'' + '}'; |
| } |
| } |