What the reason to use RowSetProvider to obtain RowSetFactory?

Question

I notice that I get same result if I use

    RowSetFactory rowSetFactory = RowSetProvider.newFactory();

and

    rowSetFactory = new RowSetFactoryImpl();

newFactory method implementation:

public static RowSetFactory newFactory()
            throws SQLException {
        // Use the system property first
        RowSetFactory factory = null;
        String factoryClassName = null;
        try {
            trace("Checking for Rowset System Property...");
            factoryClassName = getSystemProperty(ROWSET_FACTORY_NAME);
            if (factoryClassName != null) {
                trace("Found system property, value=" + factoryClassName);
                factory = (RowSetFactory) getFactoryClass(factoryClassName, null, true).newInstance();
            }
        } catch (ClassNotFoundException e) {
            throw new SQLException(
                    "RowSetFactory: " + factoryClassName + " not found", e);
        } catch (Exception e) {
            throw new SQLException(
                    "RowSetFactory: " + factoryClassName + " could not be instantiated: " + e,
                    e);
        }

Here we see that this method returns RowSetFactory which set in system.property.

What the reason to change this system property?

Who does set this property by default?

You only get the same result if the system property hasn't been set explicitly... BTW: Your question is answered in the API doc: there can be alternative implementations, I fail to see why you need to ask this question. — Mark Rotteveel, Aug 31 '14 at 14:27
Ok. I want to know situations when I should to use alternative implementation. and what can be different in alternative implementation? — gstackoverflow, Aug 31 '14 at 20:45
The primary reason would be if that other implementation provides better support or fixes bugs; think of database implementation specific tricks to simply loading, refreshing or storing the data in the rowset. However, I don't actually know if there are any alternative implementations available. — Mark Rotteveel, Sep 01 '14 at 07:21

score 0 · Answer 1 · answered Aug 08 '22 at 02:11

The com.sun.rowset.RowSetFactoryImpl class (see source code) is but one of possibly several concrete implementations of the RowSetFactory interface.

RowSetProvider & RowSetFactory make it easy to find default implementations as well as give you the flexibility to customize for particular implementations.

You can see this in the Javadoc of RowSetProvider.

Default:
RowSetProvider.newFactory()
Custom:
RowSetProvider.newFactory("com.sun.rowset.RowSetFactoryImpl", null)

What the reason to use RowSetProvider to obtain RowSetFactory?

1 Answers1

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