| 1 | /* |
| 2 | * Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. |
| 3 | * |
| 4 | * WSO2 Inc. licenses this file to you under the Apache License, |
| 5 | * Version 2.0 (the "License"); you may not use this file except |
| 6 | * in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, |
| 12 | * software distributed under the License is distributed on an |
| 13 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 14 | * KIND, either express or implied. See the License for the |
| 15 | * specific language governing permissions and limitations |
| 16 | * under the License. |
| 17 | */ |
| 18 | package org.wso2.siddhi.core.projector; |
| 19 | |
| 20 | import org.wso2.siddhi.core.event.AtomicEvent; |
| 21 | import org.wso2.siddhi.core.event.Event; |
| 22 | import org.wso2.siddhi.core.event.ListEvent; |
| 23 | import org.wso2.siddhi.core.event.StreamEvent; |
| 24 | import org.wso2.siddhi.core.event.in.InEvent; |
| 25 | import org.wso2.siddhi.core.event.in.InStream; |
| 26 | import org.wso2.siddhi.core.event.remove.RemoveEvent; |
| 27 | import org.wso2.siddhi.core.event.remove.RemoveStream; |
| 28 | import org.wso2.siddhi.core.executor.conditon.ConditionExecutor; |
| 29 | import org.wso2.siddhi.core.projector.attibute.generator.AbstractAggregateAttributeGenerator; |
| 30 | import org.wso2.siddhi.core.projector.attibute.generator.SimpleOutputAttributeGenerator; |
| 31 | import org.wso2.siddhi.core.projector.attibute.generator.groupby.GroupByOutputAttributeGenerator; |
| 32 | import org.wso2.siddhi.core.stream.StreamJunction; |
| 33 | import org.wso2.siddhi.core.util.parser.AggregatorParser; |
| 34 | import org.wso2.siddhi.core.util.parser.ExecutorParser; |
| 35 | import org.wso2.siddhi.query.api.condition.Condition; |
| 36 | import org.wso2.siddhi.query.api.definition.StreamDefinition; |
| 37 | import org.wso2.siddhi.query.api.expression.Variable; |
| 38 | import org.wso2.siddhi.query.api.query.QueryEventStream; |
| 39 | import org.wso2.siddhi.query.api.query.projection.Projector; |
| 40 | import org.wso2.siddhi.query.api.query.projection.attribute.AggregationAttribute; |
| 41 | import org.wso2.siddhi.query.api.query.projection.attribute.OutputAttribute; |
| 42 | import org.wso2.siddhi.query.api.query.projection.attribute.SimpleAttribute; |
| 43 | |
| 44 | import java.util.ArrayList; |
| 45 | import java.util.List; |
| 46 | |
| 47 | public class QueryProjector { |
| 48 | |
| 49 | // private List<Object[]> dataList = new ArrayList<Object[]>(); |
| 50 | private List<OutputAttributeGenerator> outputAttributeGeneratorList; |
| 51 | private List<OutputAttributeGenerator> aggregateOutputAttributeGeneratorList; |
| 52 | private int outputSize; |
| 53 | private String outputStreamId; |
| 54 | private StreamDefinition outputStreamDefinition = new StreamDefinition(); |
| 55 | private StreamJunction outputStreamJunction; |
| 56 | private Projector projector; |
| 57 | private ConditionExecutor havingConditionExecutor = null; |
| 58 | |
| 59 | public QueryProjector(String outputStreamId, Projector projector, |
| 60 | List<QueryEventStream> queryEventStreamList) { |
| 61 | this.outputStreamId = outputStreamId; |
| 62 | outputStreamDefinition.name(outputStreamId); |
| 63 | this.projector = projector; |
| 64 | outputSize = projector.getProjectionList().size(); |
| 65 | outputAttributeGeneratorList = new ArrayList<OutputAttributeGenerator>(outputSize); |
| 66 | aggregateOutputAttributeGeneratorList = new ArrayList<OutputAttributeGenerator>(outputSize); |
| 67 | generateOutputAttributeGenerators(queryEventStreamList, generateGroupByOutputAttributeGenerator(projector.getGroupByList(), queryEventStreamList)); |
| 68 | generateHavingExecutor(projector.getHavingCondition()); |
| 69 | |
| 70 | } |
| 71 | |
| 72 | private void generateHavingExecutor(Condition condition) { |
| 73 | if (condition != null) { |
| 74 | List<QueryEventStream> queryEventStreamList = new ArrayList<QueryEventStream>(); |
| 75 | queryEventStreamList.add(new QueryEventStream(outputStreamId, outputStreamId, outputStreamDefinition)); |
| 76 | havingConditionExecutor = ExecutorParser.parseCondition(condition, queryEventStreamList, outputStreamId); |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | private GroupByOutputAttributeGenerator generateGroupByOutputAttributeGenerator( |
| 81 | List<Variable> groupByList, |
| 82 | List<QueryEventStream> queryEventStreamList) { |
| 83 | |
| 84 | if (groupByList.size() > 0) { |
| 85 | return new GroupByOutputAttributeGenerator(projector.getGroupByList(), queryEventStreamList); |
| 86 | } else { |
| 87 | return null; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | private void generateOutputAttributeGenerators(List<QueryEventStream> queryEventStreamList, |
| 92 | GroupByOutputAttributeGenerator groupByOutputAttributeGenerator) { |
| 93 | for (OutputAttribute outputAttribute : projector.getProjectionList()) { |
| 94 | if (outputAttribute instanceof SimpleAttribute) { |
| 95 | SimpleOutputAttributeGenerator attributeGenerator = new SimpleOutputAttributeGenerator(ExecutorParser.parseExpression(((SimpleAttribute) outputAttribute).getExpression(), queryEventStreamList, null)); |
| 96 | outputAttributeGeneratorList.add(attributeGenerator); |
| 97 | outputStreamDefinition.attribute(outputAttribute.getRename(), attributeGenerator.getType()); |
| 98 | } else { //Aggregations |
| 99 | AbstractAggregateAttributeGenerator attributeGenerator = AggregatorParser.loadAggregatorClass(((AggregationAttribute) outputAttribute).getAggregationName()); |
| 100 | if (groupByOutputAttributeGenerator != null) { //for group |
| 101 | attributeGenerator = groupByOutputAttributeGenerator.createNewInstance().assignAggregateAttributeGenerator(attributeGenerator); |
| 102 | } |
| 103 | attributeGenerator.assignExpressions(((AggregationAttribute) outputAttribute).getExpressions(), queryEventStreamList); |
| 104 | outputAttributeGeneratorList.add(attributeGenerator); |
| 105 | aggregateOutputAttributeGeneratorList.add(attributeGenerator); |
| 106 | outputStreamDefinition.attribute(outputAttribute.getRename(), attributeGenerator.getType()); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | } |
| 111 | |
| 112 | |
| 113 | public StreamDefinition getOutputStreamDefinition() { |
| 114 | return outputStreamDefinition; |
| 115 | } |
| 116 | |
| 117 | public void setStreamJunction(StreamJunction streamJunction) { |
| 118 | this.outputStreamJunction = streamJunction; |
| 119 | } |
| 120 | |
| 121 | public void process(AtomicEvent atomicEvent) { |
| 122 | // System.out.println("Arrived "); |
| 123 | Object[] data = new Object[outputSize]; |
| 124 | for (int i = 0, outputAttributeGeneratorListSize = outputAttributeGeneratorList.size(); i < outputAttributeGeneratorListSize; i++) { |
| 125 | OutputAttributeGenerator outputAttributeGenerator = outputAttributeGeneratorList.get(i); |
| 126 | data[i] = outputAttributeGenerator.process(atomicEvent); |
| 127 | } |
| 128 | // dataList.add(data); |
| 129 | try { |
| 130 | if (havingConditionExecutor == null) { |
| 131 | if (atomicEvent instanceof InStream) { |
| 132 | outputStreamJunction.send(new InEvent(outputStreamId, atomicEvent.getTimeStamp(), data)); |
| 133 | } else { |
| 134 | outputStreamJunction.send(new RemoveEvent(outputStreamId, atomicEvent.getTimeStamp(), data,((RemoveStream)atomicEvent).getExpiryTime())); |
| 135 | } |
| 136 | } else { |
| 137 | StreamEvent event; |
| 138 | if (atomicEvent instanceof InStream) { |
| 139 | event = new InEvent(outputStreamId, atomicEvent.getTimeStamp(), data); |
| 140 | } else { |
| 141 | event = new RemoveEvent(outputStreamId, atomicEvent.getTimeStamp(), data,((RemoveStream)atomicEvent).getExpiryTime()); |
| 142 | } |
| 143 | if (havingConditionExecutor.execute((AtomicEvent) event)) { |
| 144 | outputStreamJunction.send(event); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | } catch (InterruptedException e) { |
| 149 | e.printStackTrace(); //todo handle |
| 150 | } |
| 151 | |
| 152 | } |
| 153 | |
| 154 | public void process(List<AtomicEvent> atomicEventList) { |
| 155 | //todo |
| 156 | } |
| 157 | |
| 158 | public void process(ListEvent listEvent) { |
| 159 | Event[] events = listEvent.getEvents(); |
| 160 | for (int i = 0, iterateLength = events.length - 1; i < iterateLength; i++) { |
| 161 | for (OutputAttributeGenerator outputAttributeGenerator : aggregateOutputAttributeGeneratorList) { |
| 162 | outputAttributeGenerator.process(events[i]); |
| 163 | } |
| 164 | } |
| 165 | process(events[events.length - 1]); |
| 166 | } |
| 167 | |
| 168 | } |
| 169 | |