| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.iotdb.library.anomaly.util; |
| |
| import org.apache.iotdb.library.util.Util; |
| import org.apache.iotdb.udf.api.access.Row; |
| import org.apache.iotdb.udf.api.access.RowIterator; |
| |
| import java.util.ArrayList; |
| |
| public class WindowDetect { |
| |
| protected int timeLength; |
| protected double len; |
| protected double threshold; |
| protected long[] time; |
| protected double[] original; |
| protected double[] repaired; |
| |
| public WindowDetect(RowIterator dataIterator, double l, double t) throws Exception { |
| len = l; |
| threshold = t; |
| ArrayList<Long> timeList = new ArrayList<>(); |
| ArrayList<Double> originList = new ArrayList<>(); |
| while (dataIterator.hasNextRow()) { |
| Row row = dataIterator.next(); |
| Double v = Util.getValueAsDouble(row); |
| timeList.add(row.getTime()); |
| if (v == null || !Double.isFinite(v)) { |
| originList.add(Double.NaN); |
| } else { |
| originList.add(v); |
| } |
| } |
| time = Util.toLongArray(timeList); |
| original = Util.toDoubleArray(originList); |
| timeLength = time.length; |
| repair(); |
| } |
| |
| private void repair() { |
| ArrayList<Double> repairedList = new ArrayList<>(); |
| ArrayList<Long> timeList = new ArrayList<>(); |
| for (int i = 0; i < timeLength; i++) { |
| long curTime = time[i]; |
| final double curValue = original[i]; |
| double valueBefore = 0.0; |
| double valueAfter = 0.0; |
| for (int j = (int) Math.max(0, i - len); j <= Math.min(timeLength - 1.0d, i + len); j++) { |
| if (j < i && Math.abs(time[j] - curTime) <= len * 1000) { |
| valueBefore += original[j]; |
| } |
| if (j > i && Math.abs(time[j] - curTime) <= len * 1000) { |
| valueAfter += original[j]; |
| } |
| } |
| valueBefore = valueBefore / len; |
| valueAfter = valueAfter / len; |
| double p1 = Math.abs(valueBefore - curValue) / (Math.max(valueBefore, curValue) + 1); |
| double p2 = Math.abs(valueAfter - curValue) / (Math.max(valueAfter, curValue) + 1); |
| if (p1 < threshold || p2 < threshold) { |
| repairedList.add(curValue); |
| timeList.add(curTime); |
| } |
| } |
| time = Util.toLongArray(timeList); |
| repaired = Util.toDoubleArray(repairedList); |
| } |
| |
| /** |
| * @return the time |
| */ |
| public long[] getTime() { |
| return time; |
| } |
| |
| /** |
| * @return the repaired |
| */ |
| public double[] getRepaired() { |
| return repaired; |
| } |
| } |