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.schema.ColumnMetadata;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.cql3.ColumnSpecification;
  import org.apache.cassandra.cql3.QueryOptions;
  import org.apache.cassandra.cql3.terms.Term;
  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;
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  /**
   * Selector representing a simple term (literals or bound variables).
   * <p>
   * Note that we know the term does not include function calls for instance (this is actually enforced by the parser), those
   * being dealt with by their own Selector.
   */
  public class TermSelector extends Selector
  {
      protected static final SelectorDeserializer deserializer = new SelectorDeserializer()
      {
          protected Selector deserialize(DataInputPlus in, int version, TableMetadata metadata) throws IOException
          {
              AbstractType<?> type = readType(metadata, in);
              ByteBuffer value = ByteBufferUtil.readWithVIntLength(in);
              return new TermSelector(value, type);
          }
      };
  
      private final ByteBuffer value;
      private final AbstractType<?> type;
  
      public static Factory newFactory(final String name, final Term term, final AbstractType<?> type)
      {
          return new Factory()
          {
              protected String getColumnName()
              {
                  return name;
              }
  
              protected AbstractType<?> getReturnType()
              {
                  return type;
              }
  
              protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultColumn)
              {
                 mapping.addMapping(resultColumn, (ColumnMetadata)null);
              }
  
              public Selector newInstance(QueryOptions options)
              {
                  return new TermSelector(term.bindAndGet(options), type);
              }
  
              public void addFetchedColumns(ColumnFilter.Builder builder)
              {
              }
  
              public boolean areAllFetchedColumnsKnown()
              {
                  return true;
              }
          };
      }
  
      TermSelector(ByteBuffer value, AbstractType<?> type)
      {
          super(Kind.TERM_SELECTOR);
          this.value = value;
          this.type = type;
      }
  
      public void addFetchedColumns(ColumnFilter.Builder builder)
      {
      }
  
      public void addInput(InputRow input)
      {
      }
  
      public ByteBuffer getOutput(ProtocolVersion protocolVersion)
      {
          return value;
      }
  
      public AbstractType<?> getType()
      {
          return type;
      }
  
      public void reset()
      {
      }
  
      @Override
      public boolean isTerminal()
      {
          return true;
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o)
              return true;
  
          if (!(o instanceof TermSelector))
              return false;
  
          TermSelector s = (TermSelector) o;
  
          return Objects.equal(value, s.value)
              && Objects.equal(type, s.type);
      }
  
      @Override
      public int hashCode()
      {
          return Objects.hashCode(value, type);
      }
  
      @Override
      protected int serializedSize(int version)
      {
          return sizeOf(type) + ByteBufferUtil.serializedSizeWithVIntLength(value);
      }
  
      @Override
      protected void serialize(DataOutputPlus out, int version) throws IOException
      {
          writeType(out, type);
          ByteBufferUtil.writeWithVIntLength(value, out);
      }
  }
  