| 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.stream.pattern; |
| 19 | |
| 20 | import org.wso2.siddhi.query.api.query.QueryEventStream; |
| 21 | import org.wso2.siddhi.query.api.stream.SingleStream; |
| 22 | import org.wso2.siddhi.query.api.stream.Stream; |
| 23 | import org.wso2.siddhi.query.api.definition.StreamDefinition; |
| 24 | import org.wso2.siddhi.query.api.stream.pattern.element.CountElement; |
| 25 | import org.wso2.siddhi.query.api.stream.pattern.element.FollowedByElement; |
| 26 | import org.wso2.siddhi.query.api.stream.pattern.element.LogicalElement; |
| 27 | import org.wso2.siddhi.query.api.stream.pattern.element.PatternElement; |
| 28 | |
| 29 | import java.util.ArrayList; |
| 30 | import java.util.HashSet; |
| 31 | import java.util.List; |
| 32 | import java.util.Map; |
| 33 | |
| 34 | public class PatternStream implements Stream, PatternElement { |
| 35 | |
| 36 | private PatternElement patternElement; |
| 37 | private List<String> streamIdList; |
| 38 | |
| 39 | public PatternStream(PatternElement patternElement) { |
| 40 | this.patternElement = patternElement; |
| 41 | this.streamIdList = new ArrayList<String>(collectStreamIds(patternElement, new HashSet<String>())); |
| 42 | } |
| 43 | |
| 44 | @Override |
| 45 | public List<String> getStreamIds() { |
| 46 | return streamIdList; |
| 47 | } |
| 48 | |
| 49 | @Override |
| 50 | public List<QueryEventStream> constructQueryEventStreamList( |
| 51 | Map<String, StreamDefinition> streamDefinitionMap, |
| 52 | List<QueryEventStream> queryEventStreams) { |
| 53 | return constructEventStreamList(patternElement, streamDefinitionMap, queryEventStreams); |
| 54 | } |
| 55 | |
| 56 | public PatternElement getPatternElement() { |
| 57 | return patternElement; |
| 58 | } |
| 59 | |
| 60 | private HashSet<String> collectStreamIds(PatternElement patternElement, |
| 61 | HashSet<String> streamIds) { |
| 62 | if (patternElement instanceof PatternStream) { |
| 63 | streamIds.addAll(((PatternStream) patternElement).getStreamIds()); |
| 64 | } else if (patternElement instanceof SingleStream) { |
| 65 | streamIds.addAll(((SingleStream) patternElement).getStreamIds()); |
| 66 | } else if (patternElement instanceof LogicalElement) { |
| 67 | collectStreamIds(((LogicalElement) patternElement).getSingleStream1(), streamIds); |
| 68 | collectStreamIds(((LogicalElement) patternElement).getSingleStream2(), streamIds); |
| 69 | } else if (patternElement instanceof CountElement) { |
| 70 | collectStreamIds(((CountElement) patternElement).getSingleStream(), streamIds); |
| 71 | } else if (patternElement instanceof FollowedByElement) { |
| 72 | collectStreamIds(((FollowedByElement) patternElement).getPatternElement(), streamIds); |
| 73 | collectStreamIds(((FollowedByElement) patternElement).getFollowedByPatternElement(), streamIds); |
| 74 | } |
| 75 | return streamIds; |
| 76 | } |
| 77 | |
| 78 | public List<QueryEventStream> constructEventStreamList(PatternElement patternElement, |
| 79 | Map<String, StreamDefinition> streamDefinitionMap, |
| 80 | List<QueryEventStream> queryEventStreams) { |
| 81 | |
| 82 | |
| 83 | if (patternElement instanceof SingleStream) { |
| 84 | ((SingleStream) patternElement).constructQueryEventStreamList(streamDefinitionMap, queryEventStreams); |
| 85 | } else if (patternElement instanceof LogicalElement) { |
| 86 | constructEventStreamList(((LogicalElement) patternElement).getSingleStream1(), streamDefinitionMap, queryEventStreams); |
| 87 | constructEventStreamList(((LogicalElement) patternElement).getSingleStream2(), streamDefinitionMap, queryEventStreams); |
| 88 | } else if (patternElement instanceof CountElement) { |
| 89 | constructEventStreamList(((CountElement) patternElement).getSingleStream(), streamDefinitionMap, queryEventStreams); |
| 90 | } else if (patternElement instanceof FollowedByElement) { |
| 91 | constructEventStreamList(((FollowedByElement) patternElement).getPatternElement(), streamDefinitionMap, queryEventStreams); |
| 92 | constructEventStreamList(((FollowedByElement) patternElement).getFollowedByPatternElement(), streamDefinitionMap, queryEventStreams); |
| 93 | } else if (patternElement instanceof PatternStream) { |
| 94 | ((PatternStream) patternElement).constructQueryEventStreamList(streamDefinitionMap, queryEventStreams); |
| 95 | } |
| 96 | |
| 97 | return queryEventStreams; |
| 98 | } |
| 99 | } |