| /* |
| * 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.nio.ByteBuffer; |
| import java.util.Comparator; |
| import java.util.stream.Stream; |
| |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| |
| public class SSTableIdFactory |
| { |
| public static final SSTableIdFactory instance = new SSTableIdFactory(); |
| |
| /** |
| * Constructs the instance of {@link SSTableId} from the given string representation. |
| * It finds the right builder by verifying whether the given string is the representation of the related identifier |
| * type using {@link SSTableId.Builder#isUniqueIdentifier(String)} method. |
| * |
| * @throws IllegalArgumentException when the provided string representation does not represent id of any type |
| */ |
| public SSTableId fromString(String str) throws IllegalArgumentException |
| { |
| return Stream.of(UUIDBasedSSTableId.Builder.instance, SequenceBasedSSTableId.Builder.instance) |
| .filter(b -> b.isUniqueIdentifier(str)) |
| .findFirst() |
| .map(b -> b.fromString(str)) |
| .orElseThrow(() -> new IllegalArgumentException("String '" + str + "' does not match any SSTable identifier format")); |
| } |
| |
| /** |
| * Constructs the instance of {@link SSTableId} from the given bytes. |
| * It finds the right builder by verifying whether the given buffer is the representation of the related identifier |
| * type using {@link SSTableId.Builder#isUniqueIdentifier(ByteBuffer)} method. |
| * |
| * The method expects the identifier is encoded in all remaining bytes of the buffer. The method does not move the |
| * pointer of the buffer. |
| * |
| * @throws IllegalArgumentException when the provided binary representation does not represent id of any type |
| */ |
| public SSTableId fromBytes(ByteBuffer bytes) |
| { |
| return Stream.of(UUIDBasedSSTableId.Builder.instance, SequenceBasedSSTableId.Builder.instance) |
| .filter(b -> b.isUniqueIdentifier(bytes)) |
| .findFirst() |
| .map(b -> b.fromBytes(bytes)) |
| .orElseThrow(() -> new IllegalArgumentException("Byte buffer of length " + bytes.remaining() + " does not match any SSTable identifier format")); |
| } |
| |
| /** |
| * Returns default identifiers builder. |
| */ |
| @SuppressWarnings("unchecked") |
| public SSTableId.Builder<SSTableId> defaultBuilder() |
| { |
| SSTableId.Builder<? extends SSTableId> builder = DatabaseDescriptor.isUUIDSSTableIdentifiersEnabled() |
| ? UUIDBasedSSTableId.Builder.instance |
| : SequenceBasedSSTableId.Builder.instance; |
| return (SSTableId.Builder<SSTableId>) builder; |
| } |
| |
| /** |
| * Compare sstable identifiers so that UUID based identifier is always greater than sequence based identifier |
| */ |
| public final static Comparator<SSTableId> COMPARATOR = Comparator.nullsFirst((id1, id2) -> { |
| if (id1 instanceof UUIDBasedSSTableId) |
| { |
| UUIDBasedSSTableId uuidId1 = (UUIDBasedSSTableId) id1; |
| return (id2 instanceof UUIDBasedSSTableId) ? uuidId1.compareTo((UUIDBasedSSTableId) id2) : 1; |
| } |
| else if (id1 instanceof SequenceBasedSSTableId) |
| { |
| SequenceBasedSSTableId seqId1 = (SequenceBasedSSTableId) id1; |
| return (id2 instanceof SequenceBasedSSTableId) ? seqId1.compareTo((SequenceBasedSSTableId) id2) : -1; |
| } |
| else |
| { |
| throw new AssertionError("Unsupported comparison between " + id1.getClass().getName() + " and " + id2.getClass().getName()); |
| } |
| }); |
| } |