| /* |
| * 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.page; |
| |
| import org.apache.iotdb.tsfile.encoding.decoder.Decoder; |
| import org.apache.iotdb.tsfile.file.header.PageHeader; |
| import org.apache.iotdb.tsfile.file.metadata.statistics.TimeStatistics; |
| import org.apache.iotdb.tsfile.read.common.TimeRange; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class TimePageReader { |
| |
| private final PageHeader pageHeader; |
| |
| /** decoder for time column */ |
| protected Decoder timeDecoder; |
| |
| /** time column in memory */ |
| protected ByteBuffer timeBuffer; |
| |
| /** A list of deleted intervals. */ |
| private List<TimeRange> deleteIntervalList; |
| |
| private int deleteCursor = 0; |
| |
| public TimePageReader(ByteBuffer pageData, Decoder timeDecoder) { |
| this(null, pageData, timeDecoder); |
| } |
| |
| public TimePageReader(PageHeader pageHeader, ByteBuffer pageData, Decoder timeDecoder) { |
| this.timeDecoder = timeDecoder; |
| this.pageHeader = pageHeader; |
| this.timeBuffer = pageData; |
| } |
| |
| public boolean hasNextTime() throws IOException { |
| return timeDecoder.hasNext(timeBuffer); |
| } |
| |
| public long nextTime() { |
| return timeDecoder.readLong(timeBuffer); |
| } |
| |
| public long[] nextTimeBatch() throws IOException { |
| long[] timeBatch = new long[(int) pageHeader.getStatistics().getCount()]; |
| int index = 0; |
| while (timeDecoder.hasNext(timeBuffer)) { |
| timeBatch[index++] = timeDecoder.readLong(timeBuffer); |
| } |
| return timeBatch; |
| } |
| |
| /** |
| * In case that we use sequence read, and the page doesn't have statistics, so we won't know time |
| * array's length at first |
| */ |
| public long[] getNextTimeBatch() throws IOException { |
| if (pageHeader.getStatistics() != null) { |
| return nextTimeBatch(); |
| } else { |
| List<Long> timeList = new ArrayList<>(); |
| while (timeDecoder.hasNext(timeBuffer)) { |
| timeList.add(timeDecoder.readLong(timeBuffer)); |
| } |
| return timeList.stream().mapToLong(t -> t).toArray(); |
| } |
| } |
| |
| public TimeStatistics getStatistics() { |
| return (TimeStatistics) pageHeader.getStatistics(); |
| } |
| |
| public void setDeleteIntervalList(List<TimeRange> list) { |
| this.deleteIntervalList = list; |
| } |
| |
| public List<TimeRange> getDeleteIntervalList() { |
| return deleteIntervalList; |
| } |
| |
| public boolean isModified() { |
| return pageHeader.isModified(); |
| } |
| |
| protected boolean isDeleted(long timestamp) { |
| while (deleteIntervalList != null && deleteCursor < deleteIntervalList.size()) { |
| if (deleteIntervalList.get(deleteCursor).contains(timestamp)) { |
| return true; |
| } else if (deleteIntervalList.get(deleteCursor).getMax() < timestamp) { |
| deleteCursor++; |
| } else { |
| return false; |
| } |
| } |
| return false; |
| } |
| } |