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.selection;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  import com.google.common.base.Preconditions;
  
  import org.apache.cassandra.cql3.terms.Lists;
  import org.apache.cassandra.cql3.QueryOptions;
  import org.apache.cassandra.db.filter.ColumnFilter;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.db.marshal.VectorType;
  import org.apache.cassandra.exceptions.InvalidRequestException;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.transport.ProtocolVersion;
  
  public class VectorSelector extends Selector
  {
      protected static final SelectorDeserializer deserializer = new SelectorDeserializer()
      {
          @Override
          protected Selector deserialize(DataInputPlus in, int version, TableMetadata metadata) throws IOException
          {
              VectorType<?> type = (VectorType<?>) readType(metadata, in);
              List<Selector> elements = new ArrayList<>(type.dimension);
              for (int i = 0; i < type.dimension; i++)
                  elements.add(serializer.deserialize(in, version, metadata));
  
              return new VectorSelector(type, elements);
          }
      };
  
      /**
       * The vector type.
       */
      private final VectorType<?> type;
  
      /**
       * The list elements
       */
      private final List<Selector> elements;
  
      private VectorSelector(VectorType<?> type, List<Selector> elements)
      {
          super(Kind.VECTOR_SELECTOR);
          Preconditions.checkArgument(elements.size() == type.dimension,
                                      "Unable to create a vector select of type %s from %s elements",
                                      type.asCQL3Type(),
                                      elements.size());
          this.type = type;
          this.elements = elements;
      }
  
      public static Factory newFactory(final AbstractType<?> type, final SelectorFactories factories)
      {
          assert type.isVector() : String.format("Unable to create vector selector from typs %s", type.asCQL3Type());
          VectorType<?> vt = (VectorType<?>) type;
          return new MultiElementFactory(type, factories)
          {
              protected String getColumnName()
              {
                  return Lists.listToString(factories, Factory::getColumnName);
              }
  
              public Selector newInstance(final QueryOptions options)
              {
                  return new VectorSelector(vt, factories.newInstances(options));
              }
          };
      }
  
      @Override
      public void addFetchedColumns(ColumnFilter.Builder builder)
      {
          for (int i = 0, m = elements.size(); i < m; i++)
              elements.get(i).addFetchedColumns(builder);
      }
  
      @Override
      public void addInput(InputRow input)
      {
          for (int i = 0, m = elements.size(); i < m; i++)
              elements.get(i).addInput(input);
      }
  
      @Override
      public AbstractType<?> getType()
      {
          return type;
      }
  
      @Override
      public void reset()
      {
          for (int i = 0, m = elements.size(); i < m; i++)
              elements.get(i).reset();
      }
  
      @Override
      public ByteBuffer getOutput(ProtocolVersion protocolVersion) throws InvalidRequestException
      {
          List<ByteBuffer> buffers = new ArrayList<>(elements.size());
          for (int i = 0, m = elements.size(); i < m; i++)
              buffers.add(elements.get(i).getOutput(protocolVersion));
  
          return type.pack(buffers);
      }
  
      @Override
      protected int serializedSize(int version)
      {
          int size = sizeOf(type);
          for (int i = 0, m = elements.size(); i < m; i++)
              size += serializer.serializedSize(elements.get(i), version);
  
          return size;
      }
  
      @Override
      protected void serialize(DataOutputPlus out, int version) throws IOException
      {
          writeType(out, type);
          for (int i = 0, m = elements.size(); i < m; i++)
              serializer.serialize(elements.get(i), out, version);
      }
  
      @Override
      public boolean isTerminal()
      {
          for (int i = 0, m = elements.size(); i < m; i++)
          {
              if (!elements.get(i).isTerminal())
                  return false;
          }
          return true;
      }
  
      @Override
      public String toString()
      {
          return Lists.listToString(elements);
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          VectorSelector that = (VectorSelector) o;
          return type.equals(that.type) && elements.equals(that.elements);
      }
  
      @Override
      public int hashCode()
      {
          return Objects.hash(type, elements);
      }
  }
  