Package jakarta.faces.model

Class ScalarDataModel<E>

java.lang.Object
jakarta.faces.model.DataModel<E>
jakarta.faces.model.ScalarDataModel<E>
All Implemented Interfaces:
Iterable<E>
public class ScalarDataModel<E> extends DataModel<E>

ScalarDataModel is a convenience implementation of DataModel that wraps an individual Java object.

  • Constructor Details

    • ScalarDataModel

      public ScalarDataModel()

      Construct a new ScalarDataModel with no specified wrapped data.

    • ScalarDataModel

      public ScalarDataModel(E scalar)

      Construct a new ScalarDataModel wrapping the specified scalar object.

      Parameters:
      scalar - Scalar to be wrapped (if any)

  • Method Details

    • isRowAvailable

      public boolean isRowAvailable()

      Return true if there is wrappedData available, and the current value of rowIndex is zero. Otherwise, return false.

      Specified by:
      isRowAvailable in class DataModel<E>
      Returns:
      true if and only if there is data available at the current index, false otherwise.
      Throws:
      FacesException - if an error occurs getting the row availability

    • getRowCount

      public int getRowCount()

      If there is wrappedData available, return 1. If no wrappedData is available, return -1.

      Specified by:
      getRowCount in class DataModel<E>
      Returns:
      the number of rows of data represented by this DataModel
      Throws:
      FacesException - if an error occurs getting the row count

    • getRowData

      public E getRowData()

      If wrapped data is available, return the wrapped data instance. Otherwise, return null.

      Specified by:
      getRowData in class DataModel<E>
      Returns:
      an object representing the data for the currently selected row index
      Throws:
      FacesException - if an error occurs getting the row data
      IllegalArgumentException - if now row data is available at the currently specified row index

    • getRowIndex

      public int getRowIndex()
      Description copied from class: DataModel

      Return the zero-relative index of the currently selected row. If we are not currently positioned on a row, or no wrappedData is available, return -1.

      Specified by:
      getRowIndex in class DataModel<E>
      Returns:
      the index of the currently selected row
      Throws:
      FacesException - if an error occurs getting the row index

    • setRowIndex

      public void setRowIndex(int rowIndex)
      Description copied from class: DataModel

      Set the zero-relative index of the currently selected row, or -1 to indicate that we are not positioned on a row. It is possible to set the row index at a value for which the underlying data collection does not contain any row data. Therefore, callers may use the isRowAvailable() method to detect whether row data will be available for use by the getRowData() method.

      If there is no wrappedData available when this method is called, the specified rowIndex is stored (and may be retrieved by a subsequent call to getRowData()), but no event is sent. Otherwise, if the currently selected row index is changed by this call, a DataModelEvent will be sent to the rowSelected() method of all registered DataModelListeners.

      Specified by:
      setRowIndex in class DataModel<E>
      Parameters:
      rowIndex - The new zero-relative index (must be non-negative)
      Throws:
      FacesException - if an error occurs setting the row index
      IllegalArgumentException - if rowIndex is less than -1

    • getWrappedData

      public Object getWrappedData()
      Description copied from class: DataModel

      Return the object representing the data wrapped by this DataModel, if any.

      Specified by:
      getWrappedData in class DataModel<E>
      Returns:
      the Object that this model wraps.

    • setWrappedData

      public void setWrappedData(Object data)
      Description copied from class: DataModel

      Set the object representing the data collection wrapped by this DataModel. If the specified data is null, detach this DataModel from any previously wrapped data collection instead.

      If data is non-null, the currently selected row index must be set to zero, and a DataModelEvent must be sent to the rowSelected() method of all registered DataModelListeners indicating that this row is now selected.

      Specified by:
      setWrappedData in class DataModel<E>
      Parameters:
      data - Data collection to be wrapped, or null to detach from any previous data collection
      Throws:
      ClassCastException - if data is not of the appropriate type for this DataModel implementation