| /* |
| * 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.schema; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.util.UUID; |
| |
| import org.apache.commons.lang3.ArrayUtils; |
| |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.utils.UUIDGen; |
| |
| /** |
| * The unique identifier of a table. |
| * <p> |
| * This is essentially a UUID, but we wrap it as it's used quite a bit in the code and having a nicely named class make |
| * the code more readable. |
| */ |
| public class TableId |
| { |
| private final UUID id; |
| |
| private TableId(UUID id) |
| { |
| this.id = id; |
| } |
| |
| public static TableId fromUUID(UUID id) |
| { |
| return new TableId(id); |
| } |
| |
| public static TableId generate() |
| { |
| return new TableId(UUIDGen.getTimeUUID()); |
| } |
| |
| public static TableId fromString(String idString) |
| { |
| return new TableId(UUID.fromString(idString)); |
| } |
| |
| /** |
| * Creates the UUID of a system table. |
| * |
| * This is deterministically based on the table name as system tables are hardcoded and initialized independently |
| * on each node (they don't go through a CREATE), but we still want them to have the same ID everywhere. |
| * |
| * We shouldn't use this for any other table. |
| */ |
| public static TableId forSystemTable(String keyspace, String table) |
| { |
| assert SchemaConstants.isLocalSystemKeyspace(keyspace) || SchemaConstants.isReplicatedSystemKeyspace(keyspace); |
| return new TableId(UUID.nameUUIDFromBytes(ArrayUtils.addAll(keyspace.getBytes(), table.getBytes()))); |
| } |
| |
| public String toHexString() |
| { |
| return ByteBufferUtil.bytesToHex(ByteBufferUtil.bytes(id)); |
| } |
| |
| public UUID asUUID() |
| { |
| return id; |
| } |
| |
| @Override |
| public final int hashCode() |
| { |
| return id.hashCode(); |
| } |
| |
| @Override |
| public final boolean equals(Object o) |
| { |
| return this == o || (o instanceof TableId && this.id.equals(((TableId) o).id)); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return id.toString(); |
| } |
| |
| public void serialize(DataOutput out) throws IOException |
| { |
| out.writeLong(id.getMostSignificantBits()); |
| out.writeLong(id.getLeastSignificantBits()); |
| } |
| |
| public int serializedSize() |
| { |
| return 16; |
| } |
| |
| public static TableId deserialize(DataInput in) throws IOException |
| { |
| return new TableId(new UUID(in.readLong(), in.readLong())); |
| } |
| } |