Package org.apache.cassandra.cql3.selection

Class SimpleSelector.SimpleSelectorFactory

java.lang.Object
org.apache.cassandra.cql3.selection.Selector.Factory
org.apache.cassandra.cql3.selection.SimpleSelector.SimpleSelectorFactory
Enclosing class:
SimpleSelector
public static final class SimpleSelector.SimpleSelectorFactory extends Selector.Factory
The Factory for SimpleSelector.

  • Method Details

    • getColumnName

      protected String getColumnName()
      Description copied from class: Selector.Factory
      Returns the name of the column corresponding to the output value of the selector instances created by this factory.
      Specified by:
      getColumnName in class Selector.Factory
      Returns:
      a column name

    • getReturnType

      protected AbstractType<?> getReturnType()
      Description copied from class: Selector.Factory
      Returns the type of the values returned by the selector instances created by this factory.
      Specified by:
      getReturnType in class Selector.Factory
      Returns:
      the selector output type

    • addColumnMapping

      protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultColumn)
      Description copied from class: Selector.Factory
      Record a mapping between the ColumnDefinitions that are used by the selector instances created by this factory and a column in the ResultSet.Metadata returned with a query. In most cases, this is likely to be a 1:1 mapping, but some selector instances may utilise multiple columns (or none at all) to produce a value (i.e. functions).
      Specified by:
      addColumnMapping in class Selector.Factory
      Parameters:
      mapping - the instance of the column mapping belonging to the current query's Selection
      resultColumn - the column in the ResultSet.Metadata to which the ColumnDefinitions used by the Selector are to be mapped

    • newInstance

      public Selector newInstance(QueryOptions options)
      Description copied from class: Selector.Factory
      Creates a new Selector instance.
      Specified by:
      newInstance in class Selector.Factory
      Parameters:
      options - the options of the query for which the instance is created (some selector depends on the bound values in particular).
      Returns:
      a new Selector instance

    • isSimpleSelectorFactory

      public boolean isSimpleSelectorFactory()
      Description copied from class: Selector.Factory
      Checks if this factory creates Selectors that simply return a column value.
      Overrides:
      isSimpleSelectorFactory in class Selector.Factory
      Returns:
      true if this factory creates Selectors that simply return a column value, false otherwise.

    • isSimpleSelectorFactoryFor

      public boolean isSimpleSelectorFactoryFor(int index)
      Description copied from class: Selector.Factory
      Checks if this factory creates Selectors that simply return the specified column.
      Overrides:
      isSimpleSelectorFactoryFor in class Selector.Factory
      Parameters:
      index - the column index
      Returns:
      true if this factory creates Selectors that simply return the specified column, false otherwise.

    • areAllFetchedColumnsKnown

      public boolean areAllFetchedColumnsKnown()

    • addFetchedColumns

      public void addFetchedColumns(ColumnFilter.Builder builder)

    • getColumn

      public ColumnMetadata getColumn()