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 com.google.common.base.Objects;
  
  import org.apache.cassandra.cql3.QueryOptions;
  import org.apache.cassandra.cql3.terms.Lists;
  import org.apache.cassandra.db.TypeSizes;
  import org.apache.cassandra.db.filter.ColumnFilter.Builder;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.db.marshal.ListType;
  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;
  
  /**
   * <code>Selector</code> for literal list (e.g. [min(value), max(value), count(value)]).
   *
   */
  final class ListSelector extends Selector
  {
      protected static final SelectorDeserializer deserializer = new SelectorDeserializer()
      {
          protected Selector deserialize(DataInputPlus in, int version, TableMetadata metadata) throws IOException
          {
              ListType<?> type = (ListType<?>) readType(metadata, in);
              int size = in.readUnsignedVInt32();
              List<Selector> elements = new ArrayList<>(size);
              for (int i = 0; i < size; i++)
                  elements.add(serializer.deserialize(in, version, metadata));
  
              return new ListSelector(type, elements);
          }
      };
  
      /**
       * The list type.
       */
      private final ListType<?> type;
  
      /**
       * The list elements
       */
      private final List<Selector> elements;
  
      public static Factory newFactory(final AbstractType<?> type, final SelectorFactories factories)
      {
          return new MultiElementFactory(type, factories)
          {
              protected String getColumnName()
              {
                  return Lists.listToString(factories, Factory::getColumnName);
              }
  
              public Selector newInstance(final QueryOptions options)
              {
                  return new ListSelector(type, factories.newInstances(options));
              }
          };
      }
  
      @Override
      public void addFetchedColumns(Builder builder)
      {
          for (int i = 0, m = elements.size(); i < m; i++)
              elements.get(i).addFetchedColumns(builder);
      }
  
      public void addInput(InputRow input)
      {
          for (int i = 0, m = elements.size(); i < m; i++)
              elements.get(i).addInput(input);
      }
  
      public ByteBuffer getOutput(ProtocolVersion protocolVersion)
      {
          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);
      }
  
      public void reset()
      {
          for (int i = 0, m = elements.size(); i < m; i++)
              elements.get(i).reset();
      }
  
      @Override
      public boolean isTerminal()
      {
          for (int i = 0, m = elements.size(); i < m; i++)
          {
              if (!elements.get(i).isTerminal())
                  return false;
          }
          return true;
      }
  
      public AbstractType<?> getType()
      {
          return type;
      }
  
      @Override
      public String toString()
      {
          return Lists.listToString(elements);
      }
  
      private ListSelector(AbstractType<?> type, List<Selector> elements)
      {
          super(Kind.LIST_SELECTOR);
          this.type = (ListType<?>) type;
          this.elements = elements;
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o)
              return true;
  
          if (!(o instanceof ListSelector))
              return false;
  
          ListSelector s = (ListSelector) o;
  
          return Objects.equal(type, s.type)
              && Objects.equal(elements, s.elements);
      }
  
      @Override
      public int hashCode()
      {
          return Objects.hashCode(type, elements);
      }
  
      @Override
      protected int serializedSize(int version)
      {
          int size = sizeOf(type) + TypeSizes.sizeofUnsignedVInt(elements.size());
          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);
          out.writeUnsignedVInt32(elements.size());
          for (int i = 0, m = elements.size(); i < m; i++)
              serializer.serialize(elements.get(i), out, version);
      }
  }
  