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 com.google.common.base.Objects;
  
  import org.apache.cassandra.db.marshal.ListType;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.cql3.QueryOptions;
  import org.apache.cassandra.cql3.ColumnSpecification;
  import org.apache.cassandra.db.TypeSizes;
  import org.apache.cassandra.db.filter.ColumnFilter;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.transport.ProtocolVersion;
  
  final class WritetimeOrTTLSelector extends Selector
  {
      static final SelectorDeserializer deserializer = new SelectorDeserializer()
      {
          @Override
          protected Selector deserialize(DataInputPlus in, int version, TableMetadata metadata) throws IOException
          {
              Selector selected = serializer.deserialize(in, version, metadata);
              int idx = in.readInt();
              int ordinal = in.readByte();
              Selectable.WritetimeOrTTL.Kind kind = Selectable.WritetimeOrTTL.Kind.fromOrdinal(ordinal);
              boolean isMultiCell = in.readBoolean();
              return new WritetimeOrTTLSelector(selected, idx, kind, isMultiCell);
          }
      };
  
      private final Selector selected;
      private final int columnIndex;
      private final Selectable.WritetimeOrTTL.Kind kind;
      private ByteBuffer current;
      private final boolean isMultiCell;
      private boolean isSet;
  
      public static Factory newFactory(final Selector.Factory factory, final int columnIndex, final Selectable.WritetimeOrTTL.Kind kind, boolean isMultiCell)
      {
          return new Factory()
          {
              @Override
              protected String getColumnName()
              {
                  return String.format("%s(%s)", kind.name, factory.getColumnName());
              }
  
              @Override
              protected AbstractType<?> getReturnType()
              {
                  AbstractType<?> type = kind.returnType;
                  return isMultiCell && !kind.aggregatesMultiCell() ? ListType.getInstance(type, false) : type;
              }
  
              @Override
              protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultsColumn)
              {
                  factory.addColumnMapping(mapping, resultsColumn);
              }
  
              @Override
              public Selector newInstance(QueryOptions options)
              {
                  return new WritetimeOrTTLSelector(factory.newInstance(options), columnIndex, kind, isMultiCell);
              }
  
              @Override
              public boolean isWritetimeSelectorFactory()
              {
                  return kind != Selectable.WritetimeOrTTL.Kind.TTL;
              }
  
              @Override
              public boolean isTTLSelectorFactory()
              {
                  return kind == Selectable.WritetimeOrTTL.Kind.TTL;
              }
  
              @Override
              public boolean isMaxWritetimeSelectorFactory()
              {
                  return kind == Selectable.WritetimeOrTTL.Kind.MAX_WRITE_TIME;
              }
  
              @Override
              public boolean areAllFetchedColumnsKnown()
              {
                  return true;
              }
  
              @Override
              public void addFetchedColumns(ColumnFilter.Builder builder)
              {
                  factory.addFetchedColumns(builder);
              }
          };
      }
  
      public void addFetchedColumns(ColumnFilter.Builder builder)
      {
          selected.addFetchedColumns(builder);
      }
  
      public void addInput(InputRow input)
      {
          if (isSet)
              return;
  
          isSet = true;
  
          selected.addInput(input);
          ProtocolVersion protocolVersion = input.getProtocolVersion();
  
          switch (kind)
          {
              case WRITE_TIME:
                  current = selected.getWritetimes(protocolVersion).toByteBuffer(protocolVersion);
                  break;
              case MAX_WRITE_TIME:
                  current = selected.getWritetimes(protocolVersion).max().toByteBuffer(protocolVersion);
                  break;
              case TTL:
                  current = selected.getTTLs(protocolVersion).toByteBuffer(protocolVersion);
                  break;
          }
      }
  
      public ByteBuffer getOutput(ProtocolVersion protocolVersion)
      {
          return current;
      }
  
      public void reset()
      {
          selected.reset();
          isSet = false;
          current = null;
      }
  
      public AbstractType<?> getType()
      {
          AbstractType<?> type = kind.returnType;
          return isMultiCell ? ListType.getInstance(type, false) : type;
      }
  
      @Override
      public String toString()
      {
          return selected.toString();
      }
  
      private WritetimeOrTTLSelector(Selector selected, int idx, Selectable.WritetimeOrTTL.Kind kind, boolean isMultiCell)
      {
          super(Kind.WRITETIME_OR_TTL_SELECTOR);
          this.selected = selected;
          this.columnIndex = idx;
          this.kind = kind;
          this.isMultiCell = isMultiCell;
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o)
              return true;
  
          if (!(o instanceof WritetimeOrTTLSelector))
              return false;
  
          WritetimeOrTTLSelector s = (WritetimeOrTTLSelector) o;
  
          return Objects.equal(selected, s.selected) && kind == s.kind;
      }
  
      @Override
      public int hashCode()
      {
          return Objects.hashCode(selected, kind);
      }
  
      @Override
      protected int serializedSize(int version)
      {
          return serializer.serializedSize(selected, version)
                  + TypeSizes.sizeof(columnIndex)
                  + TypeSizes.sizeofUnsignedVInt(kind.ordinal())
                  + TypeSizes.sizeof(isMultiCell);
      }
  
      @Override
      protected void serialize(DataOutputPlus out, int version) throws IOException
      {
          serializer.serialize(selected, out, version);
          out.writeInt(columnIndex);
          out.writeByte(kind.ordinal());
          out.writeBoolean(isMultiCell);
      }
  }
  