Class ArrayColumn

Method Details

• isWritable

  public boolean isWritable()

  Returns true, since this class can store cell values.

  Overrides:

  isWritable in class ColumnData

  Returns:

  true

• storeValue

  public void storeValue(long lrow, Object val)

  Description copied from class: ColumnData

  Stores a given value in a given row for this column. Will only work if the isWritable method returns true. The implementation in the ColumnData class throws an UnsupportedOperationException.

  Overrides:

  storeValue in class ColumnData

  Parameters:

  lrow - the row to store it in

  val - the object to store

• readValue

  public Object readValue(long lrow)

  Description copied from class: ColumnData

  Returns the value stored at a given row in this column.

  Specified by:

  readValue in class ColumnData

  Parameters:

  lrow - the row from which to retrieve the value

  Returns:

  the value stored at irow

• getArray

  public Object getArray()

  Returns the array object which holds the array data for this column.

  Returns:

  data array

• makeColumn

  public static ArrayColumn makeColumn(ColumnInfo base, long rowCount)

  Obtains an ArrayColumn object based on a template object with a given number of rows. A new ColumnInfo object will be constructed based on the given one. It will return a PrimitiveArrayColumn if info describes a primitive type.

  Parameters:

  base - the template ColumnInfo - note this is not the actual ColumnInfo object which will be returned by the getColumnInfo method of the returned ArrayColumn

  rowCount - the number of rows it is to hold

  Returns:

  a new ArrayColumn based on base with storage for rowCount elements

• makeColumn

  public static ArrayColumn makeColumn(ColumnInfo base, Object data)

  Constructs a new ArrayColumn based on a given data array. The contentClass of the given base column info must be compatible with the supplied data array; in the case of a primitive data array it should be that of the corresponding wrapper class, and for non-primitive classes it should be the class of what the array is an array of. Alternatively, the base column info may have a null content class, in which case the column info for the new column will be set appropriately from the data array.

  Parameters:

  base - the column info on which to base this column's info

  data - an array of primitives or objects which will form the storage for this column

  Throws:

  IllegalArgumentException - if data isn't an array or base.getContentClass() is incompatible with data

• makeColumn

  public static ArrayColumn makeColumn(String name, Object data)

  Constructs a new ArrayColumn based on a given data array. This convenience method results in a column with no metadata other than the column name and its data type. The data type is inferred from the type of the array object supplied.

  Parameters:

  name - the name of the new column

  data - an array of primitives or objects which will form the storage for this column