public class DataSourceUtils
- extends Object
Contains utility methods to work with
|Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
public static long getSize(DataSource ds)
- Determine the size of the data represented by a
The method will try to determine the size without reading the data source.
It will do so by looking for the
SizeAwareDataSource interface. In addition, it
supports some other well known data source implementations for which it is possible to
get the size of the data without reading it.
As noted in the documentation of the
SizeAwareDataSource, the returned value
may be an estimation that is not 100% accurate, and code using this method must be prepared
to receive more or less data from the data source.
ds - the data source
- (an estimation of) the size of the data or
-1 if the size is unknown
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