| 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.attibute.generator; |
| 19 | |
| 20 | import org.wso2.siddhi.core.event.AtomicEvent; |
| 21 | import org.wso2.siddhi.core.event.remove.RemoveStream; |
| 22 | import org.wso2.siddhi.core.executor.expression.ExpressionExecutor; |
| 23 | import org.wso2.siddhi.core.projector.attibute.aggregator.Aggregator; |
| 24 | import org.wso2.siddhi.core.util.parser.AggregatorParser; |
| 25 | import org.wso2.siddhi.core.util.parser.ExecutorParser; |
| 26 | import org.wso2.siddhi.query.api.definition.Attribute; |
| 27 | import org.wso2.siddhi.query.api.expression.Expression; |
| 28 | import org.wso2.siddhi.query.api.query.QueryEventStream; |
| 29 | |
| 30 | import java.util.List; |
| 31 | |
| 32 | public class MaxAggregateAttributeGenerator extends AbstractAggregateAttributeGenerator { |
| 33 | private ExpressionExecutor expressionExecutor; |
| 34 | private Aggregator aggregator; |
| 35 | |
| 36 | public MaxAggregateAttributeGenerator() { |
| 37 | } |
| 38 | |
| 39 | private MaxAggregateAttributeGenerator(Aggregator aggregator, |
| 40 | ExpressionExecutor expressionExecutor) { |
| 41 | this.aggregator = aggregator; |
| 42 | this.expressionExecutor = expressionExecutor; |
| 43 | } |
| 44 | |
| 45 | @Override |
| 46 | public void assignExpressions(Expression[] expressions, |
| 47 | List<QueryEventStream> queryEventStreamList) { |
| 48 | expressionExecutor = ExecutorParser.parseExpression(expressions[0], queryEventStreamList, null); |
| 49 | aggregator = AggregatorParser.createMaxAggregator(expressionExecutor.getType()); |
| 50 | } |
| 51 | |
| 52 | @Override |
| 53 | public AbstractAggregateAttributeGenerator createNewInstance() { |
| 54 | return new MaxAggregateAttributeGenerator(aggregator.createNewInstance(),expressionExecutor); |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public Attribute.Type getType() { |
| 59 | return aggregator.getType(); |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public Object process(AtomicEvent event) { |
| 64 | if (event instanceof RemoveStream) { |
| 65 | return aggregator.remove(expressionExecutor.execute(event)); |
| 66 | } else { |
| 67 | return aggregator.add(expressionExecutor.execute(event)); |
| 68 | } |
| 69 | } |
| 70 | } |