README.md

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"));