| /* |
| * 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.cql3.statements; |
| |
| import org.apache.cassandra.auth.Permission; |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.config.ViewDefinition; |
| import org.apache.cassandra.config.Schema; |
| import org.apache.cassandra.cql3.CFName; |
| import org.apache.cassandra.exceptions.ConfigurationException; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| import org.apache.cassandra.exceptions.UnauthorizedException; |
| import org.apache.cassandra.schema.KeyspaceMetadata; |
| import org.apache.cassandra.service.ClientState; |
| import org.apache.cassandra.service.MigrationManager; |
| import org.apache.cassandra.transport.Event; |
| |
| public class DropTableStatement extends SchemaAlteringStatement |
| { |
| private final boolean ifExists; |
| |
| public DropTableStatement(CFName name, boolean ifExists) |
| { |
| super(name); |
| this.ifExists = ifExists; |
| } |
| |
| public void checkAccess(ClientState state) throws UnauthorizedException, InvalidRequestException |
| { |
| try |
| { |
| state.hasColumnFamilyAccess(keyspace(), columnFamily(), Permission.DROP); |
| } |
| catch (InvalidRequestException e) |
| { |
| if (!ifExists) |
| throw e; |
| } |
| } |
| |
| public void validate(ClientState state) |
| { |
| // validated in announceMigration() |
| } |
| |
| public Event.SchemaChange announceMigration(boolean isLocalOnly) throws ConfigurationException |
| { |
| try |
| { |
| KeyspaceMetadata ksm = Schema.instance.getKSMetaData(keyspace()); |
| if (ksm == null) |
| throw new ConfigurationException(String.format("Cannot drop table in unknown keyspace '%s'", keyspace())); |
| CFMetaData cfm = ksm.getTableOrViewNullable(columnFamily()); |
| if (cfm != null) |
| { |
| if (cfm.isView()) |
| throw new InvalidRequestException("Cannot use DROP TABLE on Materialized View"); |
| |
| boolean rejectDrop = false; |
| StringBuilder messageBuilder = new StringBuilder(); |
| for (ViewDefinition def : ksm.views) |
| { |
| if (def.baseTableId.equals(cfm.cfId)) |
| { |
| if (rejectDrop) |
| messageBuilder.append(','); |
| rejectDrop = true; |
| messageBuilder.append(def.viewName); |
| } |
| } |
| if (rejectDrop) |
| { |
| throw new InvalidRequestException(String.format("Cannot drop table when materialized views still depend on it (%s.{%s})", |
| keyspace(), |
| messageBuilder.toString())); |
| } |
| } |
| MigrationManager.announceColumnFamilyDrop(keyspace(), columnFamily(), isLocalOnly); |
| return new Event.SchemaChange(Event.SchemaChange.Change.DROPPED, Event.SchemaChange.Target.TABLE, keyspace(), columnFamily()); |
| } |
| catch (ConfigurationException e) |
| { |
| if (ifExists) |
| return null; |
| throw e; |
| } |
| } |
| } |