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A fork of the Apache Cassandra Project ready to embed Elasticsearch.
/*
* 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.db.marshal.*;
import org.apache.cassandra.exceptions.*;
import org.apache.cassandra.schema.KeyspaceMetadata;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.MigrationManager;
import org.apache.cassandra.service.QueryState;
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)
{
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
{
KeyspaceMetadata 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()));
}
if (!ksm.types.get(name.getUserTypeName()).isPresent())
{
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 : ksm.functions)
{
if (function.returnType().referencesUserType(name.getStringTypeName()))
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 (argType.referencesUserType(name.getStringTypeName()))
throw new InvalidRequestException(String.format("Cannot drop user type %s as it is still used by function %s", name, function));
}
for (UserType ut : ksm.types)
if (!ut.name.equals(name.getUserTypeName()) && ut.referencesUserType(name.getStringTypeName()))
throw new InvalidRequestException(String.format("Cannot drop user type %s as it is still used by user type %s", name, ut.getNameAsString()));
for (CFMetaData cfm : ksm.tablesAndViews())
for (ColumnDefinition def : cfm.allColumns())
if (def.type.referencesUserType(name.getStringTypeName()))
throw new InvalidRequestException(String.format("Cannot drop user type %s as it is still used by table %s.%s", name, cfm.ksName, cfm.cfName));
}
@Override
public String keyspace()
{
return name.getKeyspace();
}
public Event.SchemaChange announceMigration(QueryState queryState, boolean isLocalOnly) throws InvalidRequestException, ConfigurationException
{
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(name.getKeyspace());
if (ksm == null)
return null; // do not assert (otherwise IF EXISTS case fails)
UserType toDrop = ksm.types.getNullable(name.getUserTypeName());
// Can be null with ifExists
if (toDrop == null)
return null;
MigrationManager.announceTypeDrop(toDrop, isLocalOnly);
return new Event.SchemaChange(Event.SchemaChange.Change.DROPPED, Event.SchemaChange.Target.TYPE, keyspace(), name.getStringTypeName());
}
}