Package com.vaadin.v7.client.widget.grid.datasources

Class ListDataSource<T>

  • All Implemented Interfaces:
    DataSource<T>
    public class ListDataSource<T>
extends Object
implements DataSource<T>
    A simple list based on an in-memory data source for simply adding a list of row pojos to the grid. Based on a wrapped list instance which supports adding and removing of items.

    Usage: 

     ListDataSource<Integer> ds = new ListDataSource<Integer>(1, 2, 3, 4);

 // Add item to the data source
 ds.asList().add(5);

 // Remove item from the data source
 ds.asList().remove(3);

 // Add multiple items
 ds.asList().addAll(Arrays.asList(5, 6, 7));
    Since:
    7.4
    Author:
    Vaadin Ltd

    • Constructor Detail

      • ListDataSource

        public ListDataSource​(List<T> datasource)
        Constructs a new list data source.

        Note: Modifications to the original list will not be reflected in the data source after the data source has been constructed. To add or remove items to the data source after it has been constructed use asList().

        Parameters:
        datasource - The list to use for providing the data to the grid

      • ListDataSource

        public ListDataSource​(T... rows)
        Constructs a data source with a set of rows. You can dynamically add and remove rows from the data source via the list you get from asList()
        Parameters:
        rows - The rows to initially add to the data source

    • Method Detail

      • ensureAvailability

        public void ensureAvailability​(int firstRowIndex,
                               int numberOfRows)
        Specified by:
        ensureAvailability in interface DataSource<T>

      • getRow

        public T getRow​(int rowIndex)
        Specified by:
        getRow in interface DataSource<T>

      • asList

        public List<T> asList()
        Gets the list that backs this datasource. Any changes made to this list will be reflected in the datasource.

        Note: The list is not the same list as passed into the data source via the constructor.

        Returns:
        Returns a list implementation that wraps the real list that backs the data source and provides events for the data source listeners.

      • sort

        public void sort​(Comparator<T> comparator)
        Sort entire container according to a Comparator.
        Parameters:
        comparator - a comparator object, which compares two data source entries (beans/pojos)

      • indexOf

        public int indexOf​(T row)
        Retrieves the index for given row object.

        Note: This method does not verify that the given row object exists at all in this DataSource.

        Parameters:
        row - the row object
        Returns:
        index of the row; or -1 if row is not available