| /** |
| * 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 java.util.HashMap; |
| import java.util.Map; |
| import org.apache.storm.generated.StreamInfo; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.utils.Utils; |
| |
| public class OutputFieldsGetter implements OutputFieldsDeclarer { |
| private Map<String, StreamInfo> fields = new HashMap<>(); |
| |
| @Override |
| public void declare(Fields fields) { |
| declare(false, fields); |
| } |
| |
| @Override |
| public void declare(boolean direct, Fields fields) { |
| declareStream(Utils.DEFAULT_STREAM_ID, direct, fields); |
| } |
| |
| @Override |
| public void declareStream(String streamId, Fields fields) { |
| declareStream(streamId, false, fields); |
| } |
| |
| @Override |
| public void declareStream(String streamId, boolean direct, Fields fields) { |
| if (null == streamId) { |
| throw new IllegalArgumentException("streamId can't be null"); |
| } |
| if (this.fields.containsKey(streamId)) { |
| throw new IllegalArgumentException("Fields for " + streamId + " already set"); |
| } |
| this.fields.put(streamId, new StreamInfo(fields.toList(), direct)); |
| } |
| |
| |
| public Map<String, StreamInfo> getFieldsDeclaration() { |
| return fields; |
| } |
| |
| } |