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.tcm.transformations;
  
  import java.io.IOException;
  import java.util.Objects;
  
  import org.apache.cassandra.exceptions.ExceptionCode;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.schema.DistributedSchema;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.Transformation;
  import org.apache.cassandra.tcm.sequences.DropAccordTable;
  import org.apache.cassandra.tcm.sequences.DropAccordTable.TableReference;
  import org.apache.cassandra.tcm.sequences.LockedRanges;
  import org.apache.cassandra.tcm.serialization.AsymmetricMetadataSerializer;
  import org.apache.cassandra.tcm.serialization.Version;
  
  public class PrepareDropAccordTable implements Transformation
  {
      public static final Serializer serializer = new Serializer();
  
      public final TableReference tableRef;
  
      public PrepareDropAccordTable(TableReference tableRef)
      {
          this.tableRef = tableRef;
      }
  
      @Override
      public Kind kind()
      {
          return Kind.PREPARE_DROP_ACCORD_TABLE;
      }
  
      @Override
      public Result execute(ClusterMetadata prev)
      {
          TableMetadata metadata = prev.schema.getKeyspaces().getTableOrViewNullable(tableRef.id);
          if (metadata == null)
              return new Rejected(ExceptionCode.INVALID, "Table " + tableRef + " is not known");
          if (!metadata.requiresAccordSupport())
              return new Rejected(ExceptionCode.INVALID, "Table " + metadata + " is not an Accord table and should be dropped normally");
          if (metadata.params.pendingDrop)
              return new Rejected(ExceptionCode.INVALID, "Table " + metadata + " is in the process of being dropped");
  
          KeyspaceMetadata ks = prev.schema.getKeyspaceMetadata(metadata.keyspace);
          metadata = metadata.unbuild().params(metadata.params.unbuild().pendingDrop(true).build()).build();
          ks = ks.withSwapped(ks.tables.withSwapped(metadata));
  
          DropAccordTable operation = DropAccordTable.newSequence(tableRef, prev.nextEpoch());
          ClusterMetadata.Transformer proposed = prev.transformer()
                                                     .with(new DistributedSchema(prev.schema.getKeyspaces().withAddedOrUpdated(ks)))
                                                     .with(prev.inProgressSequences.with(tableRef, operation));
          return Transformation.success(proposed, LockedRanges.AffectedRanges.EMPTY);
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          PrepareDropAccordTable that = (PrepareDropAccordTable) o;
          return tableRef.equals(that.tableRef);
      }
  
      @Override
      public int hashCode()
      {
          return Objects.hash(tableRef);
      }
  
      public static class Serializer implements AsymmetricMetadataSerializer<Transformation, PrepareDropAccordTable>
      {
          @Override
          public void serialize(Transformation t, DataOutputPlus out, Version version) throws IOException
          {
              PrepareDropAccordTable plan = (PrepareDropAccordTable) t;
              TableReference.serializer.serialize(plan.tableRef, out, version);
          }
  
          @Override
          public PrepareDropAccordTable deserialize(DataInputPlus in, Version version) throws IOException
          {
              TableReference table = TableReference.serializer.deserialize(in, version);
              return new PrepareDropAccordTable(table);
          }
  
          @Override
          public long serializedSize(Transformation t, Version version)
          {
              PrepareDropAccordTable plan = (PrepareDropAccordTable) t;
              return TableReference.serializer.serializedSize(plan.tableRef, version);
          }
      }
  }
  