| /* |
| * 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; |
| |
| import java.util.EnumSet; |
| import java.util.regex.Pattern; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Objects; |
| |
| /** |
| * SSTables are made up of multiple components in separate files. Components are |
| * identified by a type and an id, but required unique components (such as the Data |
| * and Index files) may have implicit ids assigned to them. |
| */ |
| public class Component |
| { |
| public static final char separator = '-'; |
| |
| final static EnumSet<Type> TYPES = EnumSet.allOf(Type.class); |
| |
| /** |
| * WARNING: Be careful while changing the names or string representation of the enum |
| * members. Streaming code depends on the names during streaming (Ref: CASSANDRA-14556). |
| */ |
| public enum Type |
| { |
| // the base data for an sstable: the remaining components can be regenerated |
| // based on the data component |
| DATA("Data.db"), |
| // index of the row keys with pointers to their positions in the data file |
| PRIMARY_INDEX("Index.db"), |
| // serialized bloom filter for the row keys in the sstable |
| FILTER("Filter.db"), |
| // file to hold information about uncompressed data length, chunk offsets etc. |
| COMPRESSION_INFO("CompressionInfo.db"), |
| // statistical metadata about the content of the sstable |
| STATS("Statistics.db"), |
| // holds CRC32 checksum of the data file |
| DIGEST("Digest.crc32"), |
| // holds the CRC32 for chunks in an a uncompressed file. |
| CRC("CRC.db"), |
| // holds SSTable Index Summary (sampling of Index component) |
| SUMMARY("Summary.db"), |
| // table of contents, stores the list of all components for the sstable |
| TOC("TOC.txt"), |
| // built-in secondary index (may be multiple per sstable) |
| SECONDARY_INDEX("SI_.*.db"), |
| // custom component, used by e.g. custom compaction strategy |
| CUSTOM(null); |
| |
| final String repr; |
| |
| Type(String repr) |
| { |
| this.repr = repr; |
| } |
| |
| @VisibleForTesting |
| public static Type fromRepresentation(String repr) |
| { |
| for (Type type : TYPES) |
| { |
| if (type.repr != null && Pattern.matches(type.repr, repr)) |
| return type; |
| } |
| return CUSTOM; |
| } |
| } |
| |
| // singleton components for types that don't need ids |
| public final static Component DATA = new Component(Type.DATA); |
| public final static Component PRIMARY_INDEX = new Component(Type.PRIMARY_INDEX); |
| public final static Component FILTER = new Component(Type.FILTER); |
| public final static Component COMPRESSION_INFO = new Component(Type.COMPRESSION_INFO); |
| public final static Component STATS = new Component(Type.STATS); |
| public final static Component DIGEST = new Component(Type.DIGEST); |
| public final static Component CRC = new Component(Type.CRC); |
| public final static Component SUMMARY = new Component(Type.SUMMARY); |
| public final static Component TOC = new Component(Type.TOC); |
| |
| public final Type type; |
| public final String name; |
| public final int hashCode; |
| |
| public Component(Type type) |
| { |
| this(type, type.repr); |
| assert type != Type.CUSTOM; |
| } |
| |
| public Component(Type type, String name) |
| { |
| assert name != null : "Component name cannot be null"; |
| this.type = type; |
| this.name = name; |
| this.hashCode = Objects.hashCode(type, name); |
| } |
| |
| /** |
| * @return The unique (within an sstable) name for this component. |
| */ |
| public String name() |
| { |
| return name; |
| } |
| |
| /** |
| * Parse the component part of a sstable filename into a {@code Component} object. |
| * |
| * @param name a string representing a sstable component. |
| * @return the component corresponding to {@code name}. Note that this always return a component as an unrecognized |
| * name is parsed into a CUSTOM component. |
| */ |
| public static Component parse(String name) |
| { |
| Type type = Type.fromRepresentation(name); |
| |
| // Build (or retrieve singleton for) the component object |
| switch (type) |
| { |
| case DATA: return Component.DATA; |
| case PRIMARY_INDEX: return Component.PRIMARY_INDEX; |
| case FILTER: return Component.FILTER; |
| case COMPRESSION_INFO: return Component.COMPRESSION_INFO; |
| case STATS: return Component.STATS; |
| case DIGEST: return Component.DIGEST; |
| case CRC: return Component.CRC; |
| case SUMMARY: return Component.SUMMARY; |
| case TOC: return Component.TOC; |
| case SECONDARY_INDEX: return new Component(Type.SECONDARY_INDEX, name); |
| case CUSTOM: return new Component(Type.CUSTOM, name); |
| default: throw new AssertionError(); |
| } |
| } |
| |
| @Override |
| public String toString() |
| { |
| return this.name(); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (o == this) |
| return true; |
| if (!(o instanceof Component)) |
| return false; |
| Component that = (Component)o; |
| return this.type == that.type && this.name.equals(that.name); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return hashCode; |
| } |
| } |