content: /*
   * 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 java.util.concurrent.TimeoutException;
  
  import org.apache.cassandra.audit.AuditLogContext;
  import org.apache.cassandra.audit.AuditLogEntryType;
  import org.apache.cassandra.auth.Permission;
  import org.apache.cassandra.cql3.*;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.guardrails.Guardrails;
  import org.apache.cassandra.db.virtual.VirtualKeyspaceRegistry;
  import org.apache.cassandra.exceptions.*;
  import org.apache.cassandra.schema.Schema;
  import org.apache.cassandra.schema.TableId;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.ClientState;
  import org.apache.cassandra.service.QueryState;
  import org.apache.cassandra.service.StorageProxy;
  import org.apache.cassandra.transport.Dispatcher;
  import org.apache.cassandra.transport.messages.ResultMessage;
  import org.apache.commons.lang3.builder.ToStringBuilder;
  import org.apache.commons.lang3.builder.ToStringStyle;
  
  public class TruncateStatement extends QualifiedStatement implements CQLStatement
  {
      public TruncateStatement(QualifiedName name)
      {
          super(name);
      }
  
      public TruncateStatement prepare(ClientState state)
      {
          return this;
      }
  
      public void authorize(ClientState state) throws InvalidRequestException, UnauthorizedException
      {
          state.ensureTablePermission(keyspace(), name(), Permission.MODIFY);
      }
  
      public void validate(ClientState state) throws InvalidRequestException
      {
          Schema.instance.validateTable(keyspace(), name());
          Guardrails.dropTruncateTableEnabled.ensureEnabled(state);
      }
  
      @Override
      public ResultMessage execute(QueryState state, QueryOptions options, Dispatcher.RequestTime requestTime) throws InvalidRequestException, TruncateException
      {
          try
          {
              TableMetadata metaData = Schema.instance.getTableMetadata(keyspace(), name());
              if (metaData.isView())
                  throw new InvalidRequestException("Cannot TRUNCATE materialized view directly; must truncate base table instead");
  
              if (metaData.isVirtual())
              {
                  executeForVirtualTable(metaData.id);
              }
              else
              {
                  StorageProxy.truncateBlocking(keyspace(), name());
              }
          }
          catch (UnavailableException | TimeoutException e)
          {
              throw new TruncateException(e);
          }
          return null;
      }
  
      public ResultMessage executeLocally(QueryState state, QueryOptions options)
      {
          try
          {
              TableMetadata metaData = Schema.instance.getTableMetadata(keyspace(), name());
              if (metaData.isView())
                  throw new InvalidRequestException("Cannot TRUNCATE materialized view directly; must truncate base table instead");
  
              if (metaData.isVirtual())
              {
                  executeForVirtualTable(metaData.id);
              }
              else
              {
                  ColumnFamilyStore cfs = Keyspace.open(keyspace()).getColumnFamilyStore(name());
                  cfs.truncateBlocking();
              }
          }
          catch (Exception e)
          {
              throw new TruncateException(e);
          }
          return null;
      }
  
      private void executeForVirtualTable(TableId id)
      {
          VirtualKeyspaceRegistry.instance.getTableNullable(id).truncate();
      }
  
      @Override
      public String toString()
      {
          return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
      }
  
      @Override
      public AuditLogContext getAuditLogContext()
      {
          return new AuditLogContext(AuditLogEntryType.TRUNCATE, keyspace(), name());
      }
  }
  