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Recent Posts
Vaadin Forum1. Vaadin Flow - Java

ArrayContainer wrapper

Marko Grönroos
1 decade ago Feb 21, 2010 10:49pm

I've been thinking of publishing this simple, yet often useful wrapper for a while. And damn, Sami made an almost identical wrapper today as well... :huh:

Anyhow, here's my version. You can use it easily, for example:

// An array
    Integer[] numbers = {4, 8, 15, 16, 23, 42};
    
    // The wrapper
    ArrayContainer<Integer> numberCtn = new ArrayContainer<Integer> (numbers);

    // The column property ID is used by Table as the default for
    // column header. It is by default "0".
    numberCtn.setColumnPropertyId("Number");

    // Use the wrapper as the data source for the table
    Table numbersTbl = new Table("Integers", numberCtn);
    mainWindow.addComponent(numbersTbl);

See the

Marko Grönroos
1 decade ago Feb 22, 2010 11:25am

I added a LazyContainer class suggested by Sami. It allows fully dynamic generation of container data from a callback interface. It's also a much easier alternative to Table.ColumnGenerator for calculating the values of one column from another.

// 100,000 rows and 2 columns
LazyContainer lazydata = new LazyContainer(100000, 2, new LazyContainer.Provider() {
    public Object getData(int row, int column) {
        if (column == 0)
            return row;
        else if (column == 1)
            return ((double)row)*((double)row);
        else
            return null;
    }
});
	
Table table = new Table("Data from a Lazy Container", lazydata);
table.setColumnHeaders(new String[] {"Index", "Power of Index"});
	
mainWindow.addComponent(table);

Notice that a Table is unable to hold more than about 500,000 items. The exact limit depends on the font size, because the table content is rendered as a very tall HTML layer.

For more details, see the:

The LazyContainer is included in the new [tt]arraycontainer-0.1.1.jar[/tt].

Joonas Lehtinen
1 decade ago Feb 22, 2010 4:01pm

Created http://dev.vaadin.com/ticket/4220 for the above mentioned 500.000 rows limitation.