| /* |
| * 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.common.conf.TSFileConfig; |
| import org.apache.iotdb.tsfile.file.MetaMarker; |
| import org.apache.iotdb.tsfile.file.metadata.IDeviceID; |
| import org.apache.iotdb.tsfile.file.metadata.PlainDeviceID; |
| import org.apache.iotdb.tsfile.read.reader.TsFileInput; |
| import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils; |
| import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| public class ChunkGroupHeader { |
| |
| private static final byte MARKER = MetaMarker.CHUNK_GROUP_HEADER; |
| |
| private final IDeviceID deviceID; |
| |
| // this field does not need to be serialized. |
| private final int serializedSize; |
| |
| /** |
| * constructor of CHUNK_GROUP_HEADER. |
| * |
| * @param deviceID device ID |
| */ |
| public ChunkGroupHeader(IDeviceID deviceID) { |
| this.deviceID = deviceID; |
| this.serializedSize = getSerializedSize(deviceID); |
| } |
| |
| public int getSerializedSize() { |
| return serializedSize; |
| } |
| |
| private int getSerializedSize(IDeviceID deviceID) { |
| // TODO: add an interface in IDeviceID |
| int length = |
| ((PlainDeviceID) deviceID).toStringID().getBytes(TSFileConfig.STRING_CHARSET).length; |
| return Byte.BYTES + ReadWriteForEncodingUtils.varIntSize(length) + length; |
| } |
| |
| /** |
| * deserialize from inputStream. |
| * |
| * @param markerRead - Whether the marker of the CHUNK_GROUP_HEADER is read ahead. |
| * @throws IOException – If an I/O error occurs. |
| */ |
| public static ChunkGroupHeader deserializeFrom(InputStream inputStream, boolean markerRead) |
| throws IOException { |
| if (!markerRead) { |
| byte marker = (byte) inputStream.read(); |
| if (marker != MARKER) { |
| MetaMarker.handleUnexpectedMarker(marker); |
| } |
| } |
| |
| // TODO: add an interface in IDeviceID |
| String deviceID = ReadWriteIOUtils.readVarIntString(inputStream); |
| if (deviceID == null || deviceID.isEmpty()) { |
| throw new IOException("DeviceId is empty"); |
| } |
| return new ChunkGroupHeader(new PlainDeviceID(deviceID)); |
| } |
| |
| /** |
| * deserialize from TsFileInput. |
| * |
| * @param markerRead - Whether the marker of the CHUNK_GROUP_HEADER is read ahead. |
| * @throws IOException - If an I/O error occurs. |
| */ |
| public static ChunkGroupHeader deserializeFrom(TsFileInput input, long offset, boolean markerRead) |
| throws IOException { |
| long offsetVar = offset; |
| if (!markerRead) { |
| offsetVar++; |
| } |
| // TODO: add an interface in IDeviceID |
| String deviceID = input.readVarIntString(offsetVar); |
| return new ChunkGroupHeader(new PlainDeviceID(deviceID)); |
| } |
| |
| public IDeviceID getDeviceID() { |
| return deviceID; |
| } |
| |
| /** |
| * serialize to outputStream. |
| * |
| * @param outputStream - output stream |
| * @return - length |
| * @throws IOException – If an I/O error occurs |
| */ |
| public int serializeTo(OutputStream outputStream) throws IOException { |
| int length = 0; |
| length += ReadWriteIOUtils.write(MARKER, outputStream); |
| length += ReadWriteIOUtils.writeVar(((PlainDeviceID) deviceID).toStringID(), outputStream); |
| return length; |
| } |
| |
| @Override |
| public String toString() { |
| return "ChunkGroupHeader{" |
| + "deviceID='" |
| + ((PlainDeviceID) deviceID).toStringID() |
| + '\'' |
| + ", serializedSize=" |
| + serializedSize |
| + '}'; |
| } |
| } |