| /* |
| * Copyright (c) 2013 DataTorrent, Inc. 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.datatorrent.lib.streamquery; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import com.datatorrent.api.BaseOperator; |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.lib.streamquery.condition.Condition; |
| |
| /** |
| * An implementation of BaseOperator that provides sql update query semantic on live data stream. <br> |
| * <p> |
| * Stream rows passing condition are emitted on output port stream. <br> |
| * <br> |
| * <b>StateFull : NO,</b> all row data is processed in current time window. <br> |
| * <b>Partitions : Yes, </b> No Input dependency among input rows. <br> |
| * <br> |
| * <b>Ports</b>:<br> |
| * <b> inport : </b> Input hash map(row) port, expects HashMap<String,Object><<br> |
| * <b> outport : </b> Output hash map(row) port, emits HashMap<String,Object><br> |
| * <br> |
| * <b> Properties : <b> <br> |
| * <b> condition : </b> Select condition for selecting rows. <br> |
| * <b> columns : </b> Column names/aggregate functions for select. <br> |
| * <br> |
| * @displayName: Update |
| * @category: streamquery |
| * @tag: sql update operator, sql condition |
| * @since 0.3.3 |
| */ |
| public class UpdateOperator extends BaseOperator |
| { |
| /** |
| * Update value map. |
| */ |
| Map<String, Object> updates = new HashMap<String, Object>(); |
| |
| /** |
| * condition. |
| */ |
| private Condition condition = null; |
| |
| /** |
| * set condition. |
| */ |
| public void setCondition(Condition condition) |
| { |
| this.condition = condition; |
| } |
| |
| /** |
| * Input port that takes a map of <string,object>. |
| */ |
| public final transient DefaultInputPort<Map<String, Object>> inport = new DefaultInputPort<Map<String, Object>>() { |
| @Override |
| public void process(Map<String, Object> tuple) |
| { |
| if ((condition != null)&&(!condition.isValidRow(tuple)))return; |
| if (updates.size() == 0) { |
| outport.emit(tuple); |
| return; |
| } |
| Map<String, Object> result = new HashMap<String, Object>(); |
| for(Map.Entry<String, Object> entry : tuple.entrySet()) { |
| if (updates.containsKey(entry.getKey())) { |
| result.put(entry.getKey(), updates.get(entry.getKey())); |
| } else { |
| result.put(entry.getKey(), entry.getValue()); |
| } |
| } |
| outport.emit(result); |
| } |
| }; |
| |
| /** |
| * Output port that emits a map of <string,object>. |
| */ |
| public final transient DefaultOutputPort<Map<String, Object>> outport = new DefaultOutputPort<Map<String, Object>>(); |
| |
| /** |
| * Add update value. |
| */ |
| public void addUpdate(String name, Object value) |
| { |
| updates.put(name, value); |
| } |
| } |