JarCasting
Stream Utility
The helper class for working with Java 8 streams. It allows to create streams from Optional, from Supplier, from Matcher etc.
How to use it?
To create stream from supplier function:
Stream<Object> stream = StreamUtil.supply(() -> hasData() ? read() : null);
To create files stream (all files in directory and subdirectories):
Stream<Path> files = StreamUtil.files("myDirectory");
To wrap lambdas throws checked exceptions:
void method(int a, String b) throws IOException, InterruptedException { }
boolean isSomething(int a, String b) throws IOException, TimeoutException { return true; }
public void testUnchecked_Throw() throws Exception {
Stream.of(1)
.filter(i1 -> StreamUtil.unchecked(() -> isSomething(i1, "1")))
.forEach(i2 -> StreamUtil.unchecked(() -> method(i2, "2")));
}
To wrap lambdas throws InterruptedException:
StreamUtil.uninterrupted(() -> Thread.sleep(1));
To logging expensive expressions:
log.debug("Debugging of {}", LazyToString.of(() -> "some expensive expression"));