| /* |
| * 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.tsfile.read.reader.series; |
| |
| import org.apache.iotdb.tsfile.file.metadata.AlignedChunkMetadata; |
| import org.apache.iotdb.tsfile.file.metadata.ChunkMetadata; |
| import org.apache.iotdb.tsfile.file.metadata.IChunkMetadata; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.BatchData; |
| import org.apache.iotdb.tsfile.read.common.Chunk; |
| import org.apache.iotdb.tsfile.read.controller.IChunkLoader; |
| import org.apache.iotdb.tsfile.read.reader.IChunkReader; |
| import org.apache.iotdb.tsfile.read.reader.chunk.AlignedChunkReader; |
| import org.apache.iotdb.tsfile.read.reader.chunk.ChunkReader; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Series reader is used to query one series of one tsfile, using this reader to query the value of |
| * a series with given timestamps. |
| */ |
| public class FileSeriesReaderByTimestamp { |
| |
| protected IChunkLoader chunkLoader; |
| protected List<IChunkMetadata> chunkMetadataList; |
| private int currentChunkIndex = 0; |
| |
| private IChunkReader chunkReader; |
| private long currentTimestamp; |
| private BatchData data = null; // current batch data |
| |
| /** init with chunkLoader and chunkMetaDataList. */ |
| public FileSeriesReaderByTimestamp( |
| IChunkLoader chunkLoader, List<IChunkMetadata> chunkMetadataList) { |
| this.chunkLoader = chunkLoader; |
| this.chunkMetadataList = chunkMetadataList; |
| currentTimestamp = Long.MIN_VALUE; |
| } |
| |
| public TSDataType getDataType() { |
| return chunkMetadataList.get(0).getDataType(); |
| } |
| |
| /** get value with time equals timestamp. If there is no such point, return null. */ |
| @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity warning |
| public Object getValueInTimestamp(long timestamp) throws IOException { |
| this.currentTimestamp = timestamp; |
| |
| // first initialization, only invoked in the first time |
| if (chunkReader == null) { |
| if (!constructNextSatisfiedChunkReader()) { |
| return null; |
| } |
| |
| if (chunkReader.hasNextSatisfiedPage()) { |
| data = chunkReader.nextPageData(); |
| } else { |
| return null; |
| } |
| } |
| |
| while (data != null) { |
| while (data.hasCurrent()) { |
| if (data.currentTime() < timestamp) { |
| data.next(); |
| } else { |
| break; |
| } |
| } |
| |
| if (data.hasCurrent()) { |
| if (data.currentTime() == timestamp) { |
| Object value = data.currentValue(); |
| data.next(); |
| return value; |
| } |
| return null; |
| } else { |
| if (chunkReader.hasNextSatisfiedPage()) { |
| data = chunkReader.nextPageData(); |
| } else if (!constructNextSatisfiedChunkReader()) { |
| return null; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Judge if the series reader has next time-value pair. |
| * |
| * @return true if has next, false if not. |
| */ |
| @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity warning |
| public boolean hasNext() throws IOException { |
| |
| if (chunkReader != null) { |
| if (data != null && data.hasCurrent()) { |
| return true; |
| } |
| while (chunkReader.hasNextSatisfiedPage()) { |
| data = chunkReader.nextPageData(); |
| if (data != null && data.hasCurrent()) { |
| return true; |
| } |
| } |
| } |
| while (constructNextSatisfiedChunkReader()) { |
| while (chunkReader.hasNextSatisfiedPage()) { |
| data = chunkReader.nextPageData(); |
| if (data != null && data.hasCurrent()) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| private boolean constructNextSatisfiedChunkReader() throws IOException { |
| while (currentChunkIndex < chunkMetadataList.size()) { |
| IChunkMetadata chunkMetaData = chunkMetadataList.get(currentChunkIndex++); |
| if (chunkSatisfied(chunkMetaData)) { |
| initChunkReader(chunkMetaData); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private void initChunkReader(IChunkMetadata chunkMetaData) throws IOException { |
| if (chunkMetaData instanceof ChunkMetadata) { |
| Chunk chunk = chunkLoader.loadChunk((ChunkMetadata) chunkMetaData); |
| this.chunkReader = new ChunkReader(chunk, currentTimestamp); |
| } else { |
| AlignedChunkMetadata alignedChunkMetadata = (AlignedChunkMetadata) chunkMetaData; |
| Chunk timeChunk = |
| chunkLoader.loadChunk((ChunkMetadata) (alignedChunkMetadata.getTimeChunkMetadata())); |
| List<Chunk> valueChunkList = new ArrayList<>(); |
| for (IChunkMetadata metadata : alignedChunkMetadata.getValueChunkMetadataList()) { |
| valueChunkList.add(chunkLoader.loadChunk((ChunkMetadata) metadata)); |
| } |
| this.chunkReader = new AlignedChunkReader(timeChunk, valueChunkList, currentTimestamp); |
| } |
| } |
| |
| private boolean chunkSatisfied(IChunkMetadata chunkMetaData) { |
| return chunkMetaData.getEndTime() >= currentTimestamp; |
| } |
| } |