As of 2017-01-12 Guava 21 was released which brings Java 8 support to the library. That removes the need for Guavate. Please upgrade to Guava 21
This is a single jar dependency for Guavate written by Stephen Colebourne and included as part of Strata under the Apache 2 License. Guavate code is Copyright (C) 2014 - present by OpenGamma Inc. and the OpenGamma group of companies.
In order to be able to use Guavate simply from many of my projects without depending on Strata, I have released it here as a simple tiny library (and added a few of my own additions).
To use this library with some Maven compatible dependency management tool, use
<dependency> <groupId>com.github.steveash.guavate</groupId> <artifactId>guavate</artifactId> <version>1.0.0</version> </dependency>
or in gradle
This depends on
- Guava v19 (though 18 should work as well)
- Apache Commons Lang3 v3.4 (though any lang3 version will work; just for the Pair type)
There are Collector implementations for each of the Immutable collections:
List<String> inputs = Lists.newArrayList("a", "b", "c"); ImmutableSet<String> outputs = inputs.stream() .map(String::toUpperCase) .filter(it -> !it.startsWith("b")) .collect(Guavate.toImmutableSet()); // outputs is an immutable set of "a" and "c"
There are also some convenient methods for collecting to maps from Map.Entry (and Common-Lang3's Pair as it implements Entry):
Map<String, Integer> inputs = ImmutableMap.of("bob", 1, "jon", 2, "mary", 3); Map<String,Integer> outputs = inputs.entrySet().stream() .map(e -> Pair.of(e.getKey().toUpperCase(), e.getValue())) .collect(Guavate.entriesToMap()); // outputs is a map of BOB:1, JON:2, MARY:3
Converting an arbitrary iterable into a stream (which should've been in the JDK to begin with):
Iterable<String> values = // ... Stream<String> streamVals = Guavate.stream(values);
and converting an Optional into a stream of zero or one element:
Optional<String> maybe = // ... Stream<String> stream = Guavate.stream(maybe);