Package org.apache.cassandra.cql3.selection

Class SimpleSelector.SimpleSelectorFactory

  • Enclosing class:
    SimpleSelector
    public static final class SimpleSelector.SimpleSelectorFactory
extends Selector.Factory
    The Factory for SimpleSelector.

    • Method Detail

      • getColumnName

        protected java.lang.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()