| /* |
| * 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.file.header; |
| |
| import org.apache.iotdb.tsfile.file.metadata.IMetadata; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics; |
| import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.Serializable; |
| import java.nio.ByteBuffer; |
| import java.util.Optional; |
| |
| public class PageHeader implements IMetadata { |
| |
| private int uncompressedSize; |
| private int compressedSize; |
| private final Statistics<? extends Serializable> statistics; |
| private boolean modified; |
| |
| public PageHeader( |
| int uncompressedSize, int compressedSize, Statistics<? extends Serializable> statistics) { |
| this.uncompressedSize = uncompressedSize; |
| this.compressedSize = compressedSize; |
| this.statistics = statistics; |
| } |
| |
| /** max page header size without statistics. */ |
| public static int estimateMaxPageHeaderSizeWithoutStatistics() { |
| // uncompressedSize, compressedSize |
| // because we use unsigned varInt to encode these two integer, |
| // each unsigned arInt will cost at most 5 bytes |
| return 2 * (Integer.BYTES + 1); |
| } |
| |
| public static PageHeader deserializeFrom( |
| InputStream inputStream, TSDataType dataType, boolean hasStatistic) throws IOException { |
| int uncompressedSize = ReadWriteForEncodingUtils.readUnsignedVarInt(inputStream); |
| if (uncompressedSize == 0) { // Empty Page |
| return new PageHeader(0, 0, null); |
| } |
| int compressedSize = ReadWriteForEncodingUtils.readUnsignedVarInt(inputStream); |
| Statistics<? extends Serializable> statistics = null; |
| if (hasStatistic) { |
| statistics = Statistics.deserialize(inputStream, dataType); |
| } |
| return new PageHeader(uncompressedSize, compressedSize, statistics); |
| } |
| |
| public static PageHeader deserializeFrom(ByteBuffer buffer, TSDataType dataType) { |
| int uncompressedSize = ReadWriteForEncodingUtils.readUnsignedVarInt(buffer); |
| if (uncompressedSize == 0) { // Empty Page |
| return new PageHeader(0, 0, null); |
| } |
| int compressedSize = ReadWriteForEncodingUtils.readUnsignedVarInt(buffer); |
| Statistics<? extends Serializable> statistics = Statistics.deserialize(buffer, dataType); |
| return new PageHeader(uncompressedSize, compressedSize, statistics); |
| } |
| |
| public static PageHeader deserializeFrom( |
| ByteBuffer buffer, Statistics<? extends Serializable> chunkStatistic) { |
| int uncompressedSize = ReadWriteForEncodingUtils.readUnsignedVarInt(buffer); |
| if (uncompressedSize == 0) { // Empty Page |
| return new PageHeader(0, 0, null); |
| } |
| int compressedSize = ReadWriteForEncodingUtils.readUnsignedVarInt(buffer); |
| return new PageHeader(uncompressedSize, compressedSize, chunkStatistic); |
| } |
| |
| public int getUncompressedSize() { |
| return uncompressedSize; |
| } |
| |
| public void setUncompressedSize(int uncompressedSize) { |
| this.uncompressedSize = uncompressedSize; |
| } |
| |
| public int getCompressedSize() { |
| return compressedSize; |
| } |
| |
| public void setCompressedSize(int compressedSize) { |
| this.compressedSize = compressedSize; |
| } |
| |
| public long getNumOfValues() { |
| return statistics.getCount(); |
| } |
| |
| @Override |
| public Statistics<? extends Serializable> getStatistics() { |
| return statistics; |
| } |
| |
| @Override |
| public Statistics<? extends Serializable> getTimeStatistics() { |
| return getStatistics(); |
| } |
| |
| @Override |
| public Optional<Statistics<? extends Serializable>> getMeasurementStatistics( |
| int measurementIndex) { |
| return Optional.ofNullable(getStatistics()); |
| } |
| |
| @Override |
| public boolean hasNullValue(int measurementIndex) { |
| return false; |
| } |
| |
| public long getEndTime() { |
| return statistics.getEndTime(); |
| } |
| |
| public long getStartTime() { |
| return statistics.getStartTime(); |
| } |
| |
| public int serializeTo(OutputStream outputStream) throws IOException { |
| int length = 0; |
| length += ReadWriteForEncodingUtils.writeUnsignedVarInt(uncompressedSize, outputStream); |
| if (uncompressedSize == 0) { // Empty Page |
| return length; |
| } |
| length += ReadWriteForEncodingUtils.writeUnsignedVarInt(compressedSize, outputStream); |
| length += statistics.serialize(outputStream); |
| return length; |
| } |
| |
| @Override |
| public String toString() { |
| return "PageHeader{" |
| + "uncompressedSize=" |
| + uncompressedSize |
| + ", compressedSize=" |
| + compressedSize |
| + ", statistics=" |
| + statistics |
| + "}"; |
| } |
| |
| public boolean isModified() { |
| return modified; |
| } |
| |
| public void setModified(boolean modified) { |
| this.modified = modified; |
| } |
| |
| /** max page header size without statistics. */ |
| public int getSerializedPageSize() { |
| if (uncompressedSize == 0) { // Empty page |
| return ReadWriteForEncodingUtils.uVarIntSize(uncompressedSize); |
| } |
| return ReadWriteForEncodingUtils.uVarIntSize(uncompressedSize) |
| + ReadWriteForEncodingUtils.uVarIntSize(compressedSize) |
| + (statistics == null ? 0 : statistics.getSerializedSize()) // page header |
| + compressedSize; // page data |
| } |
| } |