Package app.babylon.table.column

Interface ColumnDouble

All Superinterfaces:
Column
public interface ColumnDouble extends Column
A column of nullable double values with efficient primitive access and predicate-based row selection.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static interface 
    ColumnDouble.Builder
    Builder for nullable double columns.

    Nested classes/interfaces inherited from interface app.babylon.table.column.Column

    Column.Type

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final Column.Type
    TYPE
    Column type descriptor for primitive double columns.

  • Method Summary

    Modifier and Type
    Method
    Description
    static ColumnDouble.Builder
    builder(ColumnName name)
    Creates a double column builder for the supplied column name.
    default int
    compare(int i, int j)
    Compares two row values from this column using the column's ordering semantics.
    default ColumnDouble
    copy(ColumnName x)
    Creates a copy of this column with the supplied column name.
    double
    get(int i)
    Returns the double value at the supplied row.
    default Column
    getAsColumn(int i)
    Returns a single-row column containing the value from the supplied row.
    default Column.Type
    getType()
    Returns the declared type of values stored in this column.
    boolean
    isConstant()
    Indicates whether the column represents the same value for every row.
    boolean
    isSet(int i)
    Indicates whether the value at the supplied row is present.
    default Selection
    select(DoublePredicate predicate)
    Selects rows whose values satisfy the supplied predicate.
    double[]
    toArray(double[] x)
    Copies the values into the provided array, allocating a new array when necessary.
    default String
    toString(int i)
    Formats the value at the supplied row for display.

    Methods inherited from interface app.babylon.table.column.Column

    getName, isAllSet, isNoneSet, size, toString, view

  • Field Details

    • TYPE

      static final Column.Type TYPE
      Column type descriptor for primitive double columns.

  • Method Details

    • builder

      static ColumnDouble.Builder builder(ColumnName name)
      Creates a double column builder for the supplied column name.
      Parameters:
      name - the column name
      Returns:
      a new double column builder

    • getType

      default Column.Type getType()
      Description copied from interface: Column
      Returns the declared type of values stored in this column.
      Specified by:
      getType in interface Column
      Returns:
      the column value type

    • get

      double get(int i)
      Returns the double value at the supplied row.
      Parameters:
      i - the zero-based row index
      Returns:
      the double value

    • isSet

      boolean isSet(int i)
      Description copied from interface: Column
      Indicates whether the value at the supplied row is present.
      Specified by:
      isSet in interface Column
      Parameters:
      i - the zero-based row index
      Returns:
      true when the row contains a value

    • toArray

      double[] toArray(double[] x)
      Copies the values into the provided array, allocating a new array when necessary.
      Parameters:
      x - the destination array, or null
      Returns:
      an array containing the column values

    • compare

      default int compare(int i, int j)
      Description copied from interface: Column
      Compares two row values from this column using the column's ordering semantics.
      Specified by:
      compare in interface Column
      Parameters:
      i - the first row index
      j - the second row index
      Returns:
      a negative number, zero, or a positive number as the first row is less than, equal to, or greater than the second

    • getAsColumn

      default Column getAsColumn(int i)
      Description copied from interface: Column
      Returns a single-row column containing the value from the supplied row.
      Specified by:
      getAsColumn in interface Column
      Parameters:
      i - the row to extract
      Returns:
      a single-row column with the same column name

    • toString

      default String toString(int i)
      Description copied from interface: Column
      Formats the value at the supplied row for display.
      Specified by:
      toString in interface Column
      Parameters:
      i - the zero-based row index
      Returns:
      the formatted row value, or an empty string when unset

    • copy

      default ColumnDouble copy(ColumnName x)
      Description copied from interface: Column
      Creates a copy of this column with the supplied column name.
      Specified by:
      copy in interface Column
      Parameters:
      x - the name to assign to the copy
      Returns:
      a column containing the same values under the new name

    • select

      default Selection select(DoublePredicate predicate)
      Selects rows whose values satisfy the supplied predicate.
      Parameters:
      predicate - the predicate to test against each set value
      Returns:
      a selection containing the predicate result for each row

    • isConstant

      boolean isConstant()
      Indicates whether the column represents the same value for every row.
      Returns:
      true when the column is constant