| 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.event; |
| 19 | |
| 20 | import org.wso2.siddhi.query.api.utils.SiddhiConstants; |
| 21 | |
| 22 | import java.util.Arrays; |
| 23 | |
| 24 | public abstract class ListEvent implements StreamEvent { |
| 25 | |
| 26 | Event[] events; |
| 27 | private int activeEvents = 0; |
| 28 | private int currentMaxSize = 0; |
| 29 | private boolean unlimited = false; |
| 30 | |
| 31 | public ListEvent(int maxEvents) { |
| 32 | if (maxEvents != SiddhiConstants.UNLIMITED) { |
| 33 | this.events = new Event[maxEvents]; |
| 34 | currentMaxSize = maxEvents; |
| 35 | } else { |
| 36 | this.events = new Event[10]; |
| 37 | currentMaxSize = 10; |
| 38 | this.unlimited = true; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | protected ListEvent(Event[] events, int activeEvents, boolean unlimited) { |
| 43 | this.events = events; |
| 44 | this.activeEvents = activeEvents; |
| 45 | this.unlimited = unlimited; |
| 46 | } |
| 47 | |
| 48 | public ListEvent(Event[] events) { |
| 49 | this.events = events; |
| 50 | this.activeEvents = events.length; |
| 51 | this.unlimited = false; |
| 52 | } |
| 53 | |
| 54 | public Event[] getEvents() { |
| 55 | return events; |
| 56 | } |
| 57 | |
| 58 | public Event getEvent(int i) { |
| 59 | return events[i]; |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public String toString() { |
| 64 | return "SingleEventList{" + |
| 65 | "events=" + (events == null ? null : Arrays.asList(events)) + |
| 66 | '}'; |
| 67 | } |
| 68 | |
| 69 | @Override |
| 70 | public long getTimeStamp() { |
| 71 | return events[activeEvents - 1].getTimeStamp(); |
| 72 | } |
| 73 | |
| 74 | public boolean addEvent(Event event) { |
| 75 | if (currentMaxSize == activeEvents) { |
| 76 | if (unlimited) { |
| 77 | Event[] newEvents = new Event[activeEvents + 10]; |
| 78 | currentMaxSize+=10; |
| 79 | System.arraycopy(events, 0, newEvents, 0, events.length); |
| 80 | events = newEvents; |
| 81 | } else { |
| 82 | return false; |
| 83 | } |
| 84 | } |
| 85 | this.events[activeEvents] = event; |
| 86 | activeEvents++; |
| 87 | return true; |
| 88 | } |
| 89 | |
| 90 | public int getActiveEvents() { |
| 91 | return activeEvents; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | public void removeLast() { |
| 96 | activeEvents--; |
| 97 | events[activeEvents] = null; |
| 98 | } |
| 99 | |
| 100 | public StreamEvent cloneEvent() { |
| 101 | int length = events.length; |
| 102 | Event[] newEvents = new Event[length]; |
| 103 | System.arraycopy(newEvents, 0, newEvents, 0, activeEvents); |
| 104 | return createEventClone(newEvents,activeEvents,unlimited); |
| 105 | |
| 106 | |
| 107 | } |
| 108 | |
| 109 | protected abstract ListEvent createEventClone(Event[] newEvents, int activeEvents, |
| 110 | boolean unlimited) ; |
| 111 | |
| 112 | public void setEvents(Event[] events) { |
| 113 | this.events = events; |
| 114 | this.activeEvents = events.length; |
| 115 | this.unlimited = false; |
| 116 | } |
| 117 | } |