| /* |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.metadata; |
| |
| import org.apache.iotdb.tsfile.utils.BloomFilter; |
| import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils; |
| import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.nio.ByteBuffer; |
| |
| /** TSFileMetaData collects all metadata info and saves in its data structure. */ |
| public class TsFileMetadata { |
| |
| // bloom filter |
| private BloomFilter bloomFilter; |
| |
| // List of <name, offset, childMetadataIndexType> |
| private MetadataIndexNode metadataIndex; |
| |
| // offset of MetaMarker.SEPARATOR |
| private long metaOffset; |
| |
| /** |
| * deserialize data from the buffer. |
| * |
| * @param buffer -buffer use to deserialize |
| * @return -a instance of TsFileMetaData |
| */ |
| public static TsFileMetadata deserializeFrom(ByteBuffer buffer) { |
| TsFileMetadata fileMetaData = new TsFileMetadata(); |
| |
| // metadataIndex |
| fileMetaData.metadataIndex = MetadataIndexNode.deserializeFrom(buffer, true); |
| |
| // metaOffset |
| long metaOffset = ReadWriteIOUtils.readLong(buffer); |
| fileMetaData.setMetaOffset(metaOffset); |
| |
| // read bloom filter |
| if (buffer.hasRemaining()) { |
| byte[] bytes = ReadWriteIOUtils.readByteBufferWithSelfDescriptionLength(buffer); |
| int filterSize = ReadWriteForEncodingUtils.readUnsignedVarInt(buffer); |
| int hashFunctionSize = ReadWriteForEncodingUtils.readUnsignedVarInt(buffer); |
| fileMetaData.bloomFilter = BloomFilter.buildBloomFilter(bytes, filterSize, hashFunctionSize); |
| } |
| |
| return fileMetaData; |
| } |
| |
| public BloomFilter getBloomFilter() { |
| return bloomFilter; |
| } |
| |
| public void setBloomFilter(BloomFilter bloomFilter) { |
| this.bloomFilter = bloomFilter; |
| } |
| |
| /** |
| * use the given outputStream to serialize. |
| * |
| * @param outputStream -output stream to determine byte length |
| * @return -byte length |
| * @throws IOException error when operating outputStream |
| */ |
| public int serializeTo(OutputStream outputStream) throws IOException { |
| int byteLen = 0; |
| |
| // metadataIndex |
| if (metadataIndex != null) { |
| byteLen += metadataIndex.serializeTo(outputStream); |
| } else { |
| byteLen += ReadWriteIOUtils.write(0, outputStream); |
| } |
| |
| // metaOffset |
| byteLen += ReadWriteIOUtils.write(metaOffset, outputStream); |
| |
| return byteLen; |
| } |
| |
| public int serializeBloomFilter(OutputStream outputStream, BloomFilter filter) |
| throws IOException { |
| int byteLen = 0; |
| byte[] bytes = filter.serialize(); |
| byteLen += ReadWriteForEncodingUtils.writeUnsignedVarInt(bytes.length, outputStream); |
| outputStream.write(bytes); |
| byteLen += bytes.length; |
| byteLen += ReadWriteForEncodingUtils.writeUnsignedVarInt(filter.getSize(), outputStream); |
| byteLen += |
| ReadWriteForEncodingUtils.writeUnsignedVarInt(filter.getHashFunctionSize(), outputStream); |
| return byteLen; |
| } |
| |
| public long getMetaOffset() { |
| return metaOffset; |
| } |
| |
| public void setMetaOffset(long metaOffset) { |
| this.metaOffset = metaOffset; |
| } |
| |
| public MetadataIndexNode getMetadataIndex() { |
| return metadataIndex; |
| } |
| |
| public void setMetadataIndex(MetadataIndexNode metadataIndex) { |
| this.metadataIndex = metadataIndex; |
| } |
| } |