| /* |
| * 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.*; |
| import org.apache.cassandra.cql3.*; |
| import org.apache.cassandra.cql3.functions.Function; |
| import org.apache.cassandra.cql3.functions.Functions; |
| import org.apache.cassandra.db.marshal.*; |
| import org.apache.cassandra.exceptions.*; |
| import org.apache.cassandra.service.ClientState; |
| import org.apache.cassandra.service.MigrationManager; |
| import org.apache.cassandra.transport.Event; |
| |
| public class DropTypeStatement extends SchemaAlteringStatement |
| { |
| private final UTName name; |
| private final boolean ifExists; |
| |
| public DropTypeStatement(UTName name, boolean ifExists) |
| { |
| super(); |
| this.name = name; |
| this.ifExists = ifExists; |
| } |
| |
| @Override |
| public void prepareKeyspace(ClientState state) throws InvalidRequestException |
| { |
| if (!name.hasKeyspace()) |
| name.setKeyspace(state.getKeyspace()); |
| } |
| |
| public void checkAccess(ClientState state) throws UnauthorizedException, InvalidRequestException |
| { |
| state.hasKeyspaceAccess(keyspace(), Permission.DROP); |
| } |
| |
| public void validate(ClientState state) throws RequestValidationException |
| { |
| KSMetaData ksm = Schema.instance.getKSMetaData(name.getKeyspace()); |
| if (ksm == null) |
| { |
| if (ifExists) |
| return; |
| else |
| throw new InvalidRequestException(String.format("Cannot drop type in unknown keyspace %s", name.getKeyspace())); |
| } |
| |
| UserType old = ksm.userTypes.getType(name.getUserTypeName()); |
| if (old == null) |
| { |
| if (ifExists) |
| return; |
| else |
| throw new InvalidRequestException(String.format("No user type named %s exists.", name)); |
| } |
| |
| // We don't want to drop a type unless it's not used anymore (mainly because |
| // if someone drops a type and recreates one with the same name but different |
| // definition with the previous name still in use, things can get messy). |
| // We have two places to check: 1) other user type that can nest the one |
| // we drop and 2) existing tables referencing the type (maybe in a nested |
| // way). |
| |
| for (Function function : Functions.all()) |
| { |
| if (isUsedBy(function.returnType())) |
| throw new InvalidRequestException(String.format("Cannot drop user type %s as it is still used by function %s", name, function)); |
| for (AbstractType<?> argType : function.argTypes()) |
| if (isUsedBy(argType)) |
| throw new InvalidRequestException(String.format("Cannot drop user type %s as it is still used by function %s", name, function)); |
| } |
| |
| for (KSMetaData ksm2 : Schema.instance.getKeyspaceDefinitions()) |
| { |
| for (UserType ut : ksm2.userTypes.getAllTypes().values()) |
| { |
| if (ut.keyspace.equals(name.getKeyspace()) && ut.name.equals(name.getUserTypeName())) |
| continue; |
| if (isUsedBy(ut)) |
| throw new InvalidRequestException(String.format("Cannot drop user type %s as it is still used by user type %s", name, ut.asCQL3Type())); |
| } |
| |
| for (CFMetaData cfm : ksm2.cfMetaData().values()) |
| for (ColumnDefinition def : cfm.allColumns()) |
| if (isUsedBy(def.type)) |
| throw new InvalidRequestException(String.format("Cannot drop user type %s as it is still used by table %s.%s", name, cfm.ksName, cfm.cfName)); |
| } |
| } |
| |
| private boolean isUsedBy(AbstractType<?> toCheck) throws RequestValidationException |
| { |
| if (toCheck instanceof UserType) |
| { |
| UserType ut = (UserType)toCheck; |
| if (name.getKeyspace().equals(ut.keyspace) && name.getUserTypeName().equals(ut.name)) |
| return true; |
| |
| for (AbstractType<?> subtype : ut.fieldTypes()) |
| if (isUsedBy(subtype)) |
| return true; |
| } |
| else if (toCheck instanceof CompositeType) |
| { |
| CompositeType ct = (CompositeType)toCheck; |
| for (AbstractType<?> subtype : ct.types) |
| if (isUsedBy(subtype)) |
| return true; |
| } |
| else if (toCheck instanceof ColumnToCollectionType) |
| { |
| for (CollectionType collection : ((ColumnToCollectionType)toCheck).defined.values()) |
| if (isUsedBy(collection)) |
| return true; |
| } |
| else if (toCheck instanceof CollectionType) |
| { |
| if (toCheck instanceof ListType) |
| return isUsedBy(((ListType)toCheck).getElementsType()); |
| else if (toCheck instanceof SetType) |
| return isUsedBy(((SetType)toCheck).getElementsType()); |
| else |
| return isUsedBy(((MapType)toCheck).getKeysType()) || isUsedBy(((MapType)toCheck).getValuesType()); |
| } |
| return false; |
| } |
| |
| public Event.SchemaChange changeEvent() |
| { |
| return new Event.SchemaChange(Event.SchemaChange.Change.DROPPED, Event.SchemaChange.Target.TYPE, keyspace(), name.getStringTypeName()); |
| } |
| |
| @Override |
| public String keyspace() |
| { |
| return name.getKeyspace(); |
| } |
| |
| public boolean announceMigration(boolean isLocalOnly) throws InvalidRequestException, ConfigurationException |
| { |
| KSMetaData ksm = Schema.instance.getKSMetaData(name.getKeyspace()); |
| if (ksm == null) |
| return false; // do not assert (otherwise IF EXISTS case fails) |
| |
| UserType toDrop = ksm.userTypes.getType(name.getUserTypeName()); |
| // Can be null with ifExists |
| if (toDrop == null) |
| return false; |
| |
| MigrationManager.announceTypeDrop(toDrop, isLocalOnly); |
| return true; |
| } |
| } |