| /* |
| * 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.cassandra.io.sstable.format; |
| |
| import java.io.IOException; |
| import java.nio.file.NoSuchFileException; |
| import java.util.Set; |
| |
| import org.apache.cassandra.io.FSReadError; |
| import org.apache.cassandra.io.compress.CompressionMetadata; |
| import org.apache.cassandra.io.sstable.Component; |
| import org.apache.cassandra.io.sstable.CorruptSSTableException; |
| import org.apache.cassandra.io.sstable.Descriptor; |
| import org.apache.cassandra.io.sstable.format.SSTableFormat.Components; |
| import org.apache.cassandra.io.util.File; |
| |
| public class CompressionInfoComponent |
| { |
| public static CompressionMetadata maybeLoad(Descriptor descriptor, Set<Component> components) |
| { |
| if (components.contains(Components.COMPRESSION_INFO)) |
| return load(descriptor); |
| |
| return null; |
| } |
| |
| public static CompressionMetadata loadIfExists(Descriptor descriptor) |
| { |
| if (descriptor.fileFor(Components.COMPRESSION_INFO).exists()) |
| return load(descriptor); |
| |
| return null; |
| } |
| |
| public static CompressionMetadata load(Descriptor descriptor) |
| { |
| return CompressionMetadata.open(descriptor.fileFor(Components.COMPRESSION_INFO), |
| descriptor.fileFor(Components.DATA).length(), |
| descriptor.version.hasMaxCompressedLength()); |
| } |
| |
| /** |
| * Best-effort checking to verify the expected compression info component exists, according to the TOC file. |
| * The verification depends on the existence of TOC file. If absent, the verification is skipped. |
| * |
| * @param descriptor |
| * @param actualComponents, actual components listed from the file system. |
| * @throws CorruptSSTableException, if TOC expects compression info but not found from disk. |
| * @throws FSReadError, if unable to read from TOC file. |
| */ |
| public static void verifyCompressionInfoExistenceIfApplicable(Descriptor descriptor, Set<Component> actualComponents) throws CorruptSSTableException, FSReadError |
| { |
| File tocFile = descriptor.fileFor(Components.TOC); |
| if (tocFile.exists()) |
| { |
| try |
| { |
| Set<Component> expectedComponents = TOCComponent.loadTOC(descriptor, false); |
| if (expectedComponents.contains(Components.COMPRESSION_INFO) && !actualComponents.contains(Components.COMPRESSION_INFO)) |
| { |
| File compressionInfoFile = descriptor.fileFor(Components.COMPRESSION_INFO); |
| throw new CorruptSSTableException(new NoSuchFileException(compressionInfoFile.absolutePath()), compressionInfoFile); |
| } |
| } |
| catch (IOException e) |
| { |
| throw new FSReadError(e, tocFile); |
| } |
| } |
| } |
| } |