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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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
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package org.apache.cassandra.cql3.statements;
import org.apache.cassandra.audit.AuditLogContext;
import org.apache.cassandra.audit.AuditLogEntryType;
import org.apache.cassandra.cql3.CQLStatement;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.exceptions.UnauthorizedException;
import org.apache.cassandra.transport.messages.ResultMessage;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.QueryState;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
public class UseStatement extends CQLStatement.Raw implements CQLStatement
{
private final String keyspace;
public UseStatement(String keyspace)
{
this.keyspace = keyspace;
}
public UseStatement prepare(ClientState state)
{
return this;
}
public void authorize(ClientState state) throws UnauthorizedException
{
state.validateLogin();
}
public void validate(ClientState state) throws InvalidRequestException
{
}
public ResultMessage execute(QueryState state, QueryOptions options, long queryStartNanoTime) throws InvalidRequestException
{
state.getClientState().setKeyspace(keyspace);
return new ResultMessage.SetKeyspace(keyspace);
}
public ResultMessage executeLocally(QueryState state, QueryOptions options) throws InvalidRequestException
{
// In production, internal queries are exclusively on the system keyspace and 'use' is thus useless
// but for some unit tests we need to set the keyspace (e.g. for tests with DROP INDEX)
return execute(state, options, System.nanoTime());
}
@Override
public String toString()
{
return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
}
@Override
public AuditLogContext getAuditLogContext()
{
return new AuditLogContext(AuditLogEntryType.USE_KEYSPACE, keyspace);
}
public String keyspace()
{
return keyspace;
}
}