Removing a whole row/column from a Table

[Clément DENIS]

I recently had to remove a whole row/column from a Table. The Table API does not provide a method to do it.

It looks like clearing the map returned by the Table.row/column() method does the trick.

   public static <R, C, V> void removeRow(Table<R, C, V> table, R rowKey) {

        table.row(rowKey).clear();

    }

    public static <R, C, V> void removeColumn(Table<R, C, V> table, C columnKey) {

        table.column(columnKey).clear();

    }

I suppose it is the right way to do it ... 

Maybe you could add a hint in the Javadoc, or add removeColumn and removeRow to the API ?

[Pete Gillin]

Matthew, could you give an example to show what you mean by "HashBasedTable supports this only for rows"? The following works fine for me.

    Table<String, Integer, Double> table = HashBasedTable.create();

    table.put("a", 1, 1.2);

    table.put("a", 2, 3.4);

    table.put("a", 3, 5.6);

    table.put("b", 2, 7.8);

    table.put("c", 2, 9.0);

    table.row("a").clear();

    table.column(2).clear();

    assertThat(table).isEmpty();

So the O.P.'s code should be fine. (It's true that the Map view you get from column() has iterators that don't support remove(), but mutation operations on the Map view itself should be fine. This is specified in the javadoc.)

Pete.

On Wed, 21 Oct 2015 at 06:56 <matthewj...@gmail.com> wrote:

In case anyone else stumbles upon this:

This behavior is dependent upon the particular implementation you are using. For example,  HashBasedTable supports this only for rows. NotSupportedException is thrown if an attempted modification is invalid.

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