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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.
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  package org.apache.cassandra.cql3.statements.schema;
  
  import java.util.Set;
  
  import com.google.common.collect.ImmutableSet;
  
  import org.apache.cassandra.audit.AuditLogContext;
  import org.apache.cassandra.audit.AuditLogEntryType;
  import org.apache.cassandra.auth.DataResource;
  import org.apache.cassandra.auth.FunctionResource;
  import org.apache.cassandra.auth.IResource;
  import org.apache.cassandra.auth.Permission;
  import org.apache.cassandra.cql3.CQLStatement;
  import org.apache.cassandra.db.guardrails.Guardrails;
  import org.apache.cassandra.exceptions.AlreadyExistsException;
  import org.apache.cassandra.locator.LocalStrategy;
  import org.apache.cassandra.locator.SimpleStrategy;
  import org.apache.cassandra.schema.*;
  import org.apache.cassandra.schema.KeyspaceParams.Option;
  import org.apache.cassandra.schema.Keyspaces.KeyspacesDiff;
  import org.apache.cassandra.service.ClientState;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.transport.Event.SchemaChange;
  import org.apache.cassandra.transport.Event.SchemaChange.Change;
  
  public final class CreateKeyspaceStatement extends AlterSchemaStatement
  {
      private final KeyspaceAttributes attrs;
      private final boolean ifNotExists;
      private String expandedCql;
  
      public CreateKeyspaceStatement(String keyspaceName, KeyspaceAttributes attrs, boolean ifNotExists)
      {
          super(keyspaceName);
          this.attrs = attrs;
          this.ifNotExists = ifNotExists;
      }
  
      @Override
      public String cql()
      {
          if (expandedCql != null)
              return expandedCql;
          return super.cql();
      }
  
      @Override
      public Keyspaces apply(ClusterMetadata metadata)
      {
          attrs.validate();
  
          if (!attrs.hasOption(Option.REPLICATION))
              throw ire("Missing mandatory option '%s'", Option.REPLICATION);
  
          if (attrs.getReplicationStrategyClass() != null && attrs.getReplicationStrategyClass().equals(SimpleStrategy.class.getSimpleName()))
              Guardrails.simpleStrategyEnabled.ensureEnabled("SimpleStrategy", state);
  
          Keyspaces schema = metadata.schema.getKeyspaces();
          if (schema.containsKeyspace(keyspaceName))
          {
              if (ifNotExists)
                  return schema;
  
              throw new AlreadyExistsException(keyspaceName);
          }
  
          // we deduplicate ReplicationParams here to use the same objects in KeyspaceMetadata
          // as we have as keys in metadata.placements to have a fast map lookup
          // ReplicationParams are immutable, so it is a safe optimization
          KeyspaceParams keyspaceParams = attrs.asNewKeyspaceParams();
          ReplicationParams replicationParams = metadata.placements.deduplicateReplicationParams(keyspaceParams.replication);
          keyspaceParams = keyspaceParams.withSwapped(replicationParams);
          KeyspaceMetadata keyspaceMetadata = KeyspaceMetadata.create(keyspaceName, keyspaceParams);
  
          if (keyspaceMetadata.params.replication.klass.equals(LocalStrategy.class))
              throw ire("Unable to use given strategy class: LocalStrategy is reserved for internal use.");
  
          if (keyspaceMetadata.params.replication.isMeta())
              throw ire("Can not create a keyspace with MetaReplicationStrategy");
  
          keyspaceMetadata.params.validate(keyspaceName, state, metadata);
          keyspaceMetadata.replicationStrategy.validateExpectedOptions(metadata);
  
          expandedCql = keyspaceMetadata.toCqlString(false, true, ifNotExists);
          verifyExpandedCql(expandedCql);
          return schema.withAddedOrUpdated(keyspaceMetadata);
      }
  
      SchemaChange schemaChangeEvent(KeyspacesDiff diff)
      {
          return new SchemaChange(Change.CREATED, keyspaceName);
      }
  
      public void authorize(ClientState client)
      {
          client.ensureAllKeyspacesPermission(Permission.CREATE);
      }
  
      @Override
      Set<IResource> createdResources(KeyspacesDiff diff)
      {
          return ImmutableSet.of(DataResource.keyspace(keyspaceName), FunctionResource.keyspace(keyspaceName));
      }
  
      @Override
      public AuditLogContext getAuditLogContext()
      {
          return new AuditLogContext(AuditLogEntryType.CREATE_KEYSPACE, keyspaceName);
      }
  
      public String toString()
      {
          return String.format("%s (%s)", getClass().getSimpleName(), keyspaceName);
      }
  
      @Override
      public void validate(ClientState state)
      {
          super.validate(state);
  
          // Guardrail on number of keyspaces
          Guardrails.keyspaces.guard(Schema.instance.getUserKeyspaces().size() + 1, keyspaceName, false, state);
  
          Guardrails.keyspaceProperties.guard(attrs.updatedProperties(), attrs::removeProperty, state);
      }
  
      public static final class Raw extends CQLStatement.Raw
      {
          public final String keyspaceName;
          private final KeyspaceAttributes attrs;
          private final boolean ifNotExists;
  
          public Raw(String keyspaceName, KeyspaceAttributes attrs, boolean ifNotExists)
          {
              this.keyspaceName = keyspaceName;
              this.attrs = attrs;
              this.ifNotExists = ifNotExists;
          }
  
          public CreateKeyspaceStatement prepare(ClientState state)
          {
              return new CreateKeyspaceStatement(keyspaceName, attrs, ifNotExists);
          }
      }
  }
  