| 1 | /* |
| 2 | * Copyright (c) 2005-2012, 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.attibute.generator.groupby; |
| 19 | |
| 20 | import org.wso2.siddhi.core.event.AtomicEvent; |
| 21 | import org.wso2.siddhi.core.executor.expression.ExpressionExecutor; |
| 22 | import org.wso2.siddhi.core.projector.attibute.generator.AbstractAggregateAttributeGenerator; |
| 23 | import org.wso2.siddhi.core.util.parser.ExecutorParser; |
| 24 | import org.wso2.siddhi.query.api.definition.Attribute; |
| 25 | import org.wso2.siddhi.query.api.expression.Expression; |
| 26 | import org.wso2.siddhi.query.api.expression.Variable; |
| 27 | import org.wso2.siddhi.query.api.query.QueryEventStream; |
| 28 | |
| 29 | import java.util.List; |
| 30 | |
| 31 | public class GroupByOutputAttributeGenerator extends AbstractAggregateAttributeGenerator { |
| 32 | |
| 33 | private ExpressionExecutor[] groupByExecutors; |
| 34 | |
| 35 | //stateful |
| 36 | private GroupByAttributeGeneratorMap attributeGeneratorMap; |
| 37 | private AbstractAggregateAttributeGenerator attributeGenerator; |
| 38 | |
| 39 | public GroupByOutputAttributeGenerator(List<Variable> groupByList, |
| 40 | List<QueryEventStream> queryEventStreamList) { |
| 41 | groupByExecutors = new ExpressionExecutor[groupByList.size()]; |
| 42 | for (int i = 0, expressionsSize = groupByList.size(); i < expressionsSize; i++) { |
| 43 | groupByExecutors[i] = ExecutorParser.parseExpression(groupByList.get(i), queryEventStreamList, null); |
| 44 | } |
| 45 | |
| 46 | } |
| 47 | |
| 48 | private GroupByOutputAttributeGenerator(ExpressionExecutor[] groupByExecutors) { |
| 49 | this.groupByExecutors = groupByExecutors; |
| 50 | } |
| 51 | |
| 52 | public GroupByOutputAttributeGenerator assignAggregateAttributeGenerator( |
| 53 | AbstractAggregateAttributeGenerator attributeGenerator) { |
| 54 | this.attributeGeneratorMap = new GroupByAttributeGeneratorMap(groupByExecutors, attributeGenerator); |
| 55 | this.attributeGenerator = attributeGenerator; |
| 56 | return this; |
| 57 | } |
| 58 | |
| 59 | @Override |
| 60 | public void assignExpressions(Expression[] expressions, |
| 61 | List<QueryEventStream> queryEventStreamList) { |
| 62 | attributeGenerator.assignExpressions(expressions, queryEventStreamList); |
| 63 | } |
| 64 | |
| 65 | |
| 66 | @Override |
| 67 | public GroupByOutputAttributeGenerator createNewInstance() { |
| 68 | return new GroupByOutputAttributeGenerator(groupByExecutors); |
| 69 | |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public Attribute.Type getType() { |
| 74 | return attributeGenerator.getType(); |
| 75 | } |
| 76 | |
| 77 | @Override |
| 78 | public Object process(AtomicEvent event) { |
| 79 | return attributeGeneratorMap.get(event).process(event); |
| 80 | } |
| 81 | } |