| /* |
| * 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.db.query.reader.series; |
| |
| import org.apache.iotdb.db.engine.querycontext.QueryDataSource; |
| import org.apache.iotdb.db.metadata.PartialPath; |
| import org.apache.iotdb.db.query.context.QueryContext; |
| import org.apache.iotdb.db.query.filter.TsFileFilter; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics; |
| import org.apache.iotdb.tsfile.read.common.BatchData; |
| import org.apache.iotdb.tsfile.read.filter.TimeFilter; |
| import org.apache.iotdb.tsfile.read.filter.basic.UnaryFilter; |
| |
| import java.io.IOException; |
| import java.util.Set; |
| |
| public class SeriesReaderByTimestamp implements IReaderByTimestamp { |
| |
| private SeriesReader seriesReader; |
| private BatchData batchData; |
| private boolean ascending; |
| |
| public SeriesReaderByTimestamp( |
| PartialPath seriesPath, |
| Set<String> allSensors, |
| TSDataType dataType, |
| QueryContext context, |
| QueryDataSource dataSource, |
| TsFileFilter fileFilter, |
| boolean ascending) { |
| UnaryFilter timeFilter = |
| ascending ? TimeFilter.gtEq(Long.MIN_VALUE) : TimeFilter.ltEq(Long.MAX_VALUE); |
| this.seriesReader = |
| SeriesReaderFactory.createSeriesReader( |
| seriesPath, |
| allSensors, |
| dataType, |
| context, |
| dataSource, |
| timeFilter, |
| null, |
| fileFilter, |
| ascending); |
| this.ascending = ascending; |
| } |
| |
| public SeriesReaderByTimestamp(SeriesReader seriesReader, boolean ascending) { |
| this.seriesReader = seriesReader; |
| this.ascending = ascending; |
| } |
| |
| @Override |
| public Object[] getValuesInTimestamps(long[] timestamps, int length) throws IOException { |
| if (length <= 0) { |
| return null; |
| } |
| Object[] results = new Object[length]; |
| seriesReader.setTimeFilter(timestamps[0]); |
| for (int i = 0; i < length; i++) { |
| if ((batchData == null || !hasAvailableData(batchData, timestamps[i])) |
| && !hasNext(timestamps[i])) { |
| // there is no more data |
| break; |
| } |
| results[i] = batchData.getValueInTimestamp(timestamps[i]); |
| } |
| |
| return results; |
| } |
| |
| @Override |
| public boolean readerIsEmpty() throws IOException { |
| return seriesReader.isEmpty() && isEmpty(batchData); |
| } |
| |
| protected boolean hasNext(long timestamp) throws IOException { |
| |
| /* |
| * consume pages firstly |
| */ |
| if (readPageData(timestamp)) { |
| return true; |
| } |
| |
| /* |
| * consume chunk secondly |
| */ |
| if (readChunkData(timestamp)) { |
| return true; |
| } |
| |
| /* |
| * consume file thirdly |
| */ |
| while (seriesReader.hasNextFile()) { |
| Statistics statistics = seriesReader.currentFileStatistics(); |
| if (!satisfyTimeFilter(statistics)) { |
| seriesReader.skipCurrentFile(); |
| continue; |
| } |
| if (readChunkData(timestamp)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean readChunkData(long timestamp) throws IOException { |
| while (seriesReader.hasNextChunk()) { |
| Statistics statistics = seriesReader.currentChunkStatistics(); |
| if (!satisfyTimeFilter(statistics)) { |
| seriesReader.skipCurrentChunk(); |
| continue; |
| } |
| if (readPageData(timestamp)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean readPageData(long timestamp) throws IOException { |
| while (seriesReader.hasNextPage()) { |
| if (!seriesReader.isPageOverlapped()) { |
| if (!satisfyTimeFilter(seriesReader.currentPageStatistics())) { |
| seriesReader.skipCurrentPage(); |
| continue; |
| } |
| } |
| batchData = seriesReader.nextPage(); |
| if (isEmpty(batchData)) { |
| continue; |
| } |
| if (hasAvailableData(batchData, timestamp)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean satisfyTimeFilter(Statistics statistics) { |
| return seriesReader.getTimeFilter().satisfy(statistics); |
| } |
| |
| private boolean isEmpty(BatchData batchData) { |
| return batchData == null || !batchData.hasCurrent(); |
| } |
| |
| private boolean hasAvailableData(BatchData data, long time) { |
| return ascending ? data.getMaxTimestamp() >= time : data.getMinTimestamp() <= time; |
| } |
| } |