| 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.query.api.query.projection; |
| 19 | |
| 20 | import org.wso2.siddhi.query.api.condition.Condition; |
| 21 | import org.wso2.siddhi.query.api.exception.AttributeAlreadyExist; |
| 22 | import org.wso2.siddhi.query.api.expression.Expression; |
| 23 | import org.wso2.siddhi.query.api.expression.Variable; |
| 24 | import org.wso2.siddhi.query.api.query.projection.attribute.AggregationAttribute; |
| 25 | import org.wso2.siddhi.query.api.query.projection.attribute.OutputAttribute; |
| 26 | import org.wso2.siddhi.query.api.query.projection.attribute.SimpleAttribute; |
| 27 | |
| 28 | import java.util.ArrayList; |
| 29 | import java.util.List; |
| 30 | |
| 31 | public class Projector { |
| 32 | private List<OutputAttribute> projectionList = new ArrayList<OutputAttribute>(); |
| 33 | private List<Variable> groupByList = new ArrayList<Variable>(); |
| 34 | private Call call; |
| 35 | private Condition havingCondition; |
| 36 | |
| 37 | public Projector project(String rename, Expression expression) { |
| 38 | OutputAttribute outputAttribute = new SimpleAttribute(rename, expression); |
| 39 | checkProjection(outputAttribute); |
| 40 | projectionList.add(outputAttribute); |
| 41 | return this; |
| 42 | } |
| 43 | |
| 44 | private void checkProjection(OutputAttribute newAttribute) { |
| 45 | for (OutputAttribute attribute : projectionList) { |
| 46 | if (attribute.getRename().equals(newAttribute.getRename())) { |
| 47 | throw new AttributeAlreadyExist(attribute.getRename() + " is already defined as an output attribute "); |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | public Projector project(String rename, String aggregationName, Expression... expressions) { |
| 53 | OutputAttribute outputAttribute = new AggregationAttribute(rename, aggregationName, expressions); |
| 54 | checkProjection(outputAttribute); |
| 55 | projectionList.add(outputAttribute); |
| 56 | return this; |
| 57 | } |
| 58 | |
| 59 | public Projector having(Condition condition) { |
| 60 | havingCondition = condition; |
| 61 | return this; |
| 62 | } |
| 63 | |
| 64 | public Projector groupBy(String streamId, String attributeName) { |
| 65 | groupByList.add(new Variable(streamId, attributeName)); |
| 66 | return this; |
| 67 | } |
| 68 | |
| 69 | public Projector groupBy(String attributeName) { |
| 70 | groupByList.add(new Variable(attributeName)); |
| 71 | return this; |
| 72 | } |
| 73 | |
| 74 | public Projector addGroupByList(List<Variable> list) { |
| 75 | if(list!=null){ |
| 76 | groupByList.addAll(list); |
| 77 | } |
| 78 | return this; |
| 79 | } |
| 80 | |
| 81 | |
| 82 | public Projector call(String callName, Object... parameters) { |
| 83 | call = new Call(callName, parameters); |
| 84 | return this; |
| 85 | } |
| 86 | |
| 87 | public List<OutputAttribute> getProjectionList() { |
| 88 | return projectionList; |
| 89 | } |
| 90 | |
| 91 | public List<Variable> getGroupByList() { |
| 92 | return groupByList; |
| 93 | } |
| 94 | |
| 95 | public Call getCall() { |
| 96 | return call; |
| 97 | } |
| 98 | |
| 99 | public Condition getHavingCondition() { |
| 100 | return havingCondition; |
| 101 | } |
| 102 | |
| 103 | public Projector addProjectionList(List<OutputAttribute> projectionList) { |
| 104 | for (OutputAttribute outputAttribute : projectionList) { |
| 105 | checkProjection(outputAttribute); |
| 106 | this.projectionList.add(outputAttribute); |
| 107 | } |
| 108 | return this; |
| 109 | } |
| 110 | } |