Gruava

Groovy already supplements the standard Java library with lots of neat functions, but Google Guava still has some additional tricks up its sleeve. Let's make use of those in a groovy way!

Gruava makes Guava's helper classes available as Groovy extension modules. This means you can now call a method like

import com.google.common.collect.Iterables;
// ...
Iterables.getOnlyElement(Iterable<T> iterable);

just like it was part of the standard library:

myIterable.getOnlyElement();
// or the Groovy way:
myIterable.onlyElement

Usage

1. Add Gruava.
   • Add gruava as compile dependency to your project.
   • It will also bring in guava as a transitive dependency. However, you can choose to use a different version of guava if you like.
2. Use Gruava.
   • The Groovy compiler and runtime will automatically pick up Gruava, you can use it without further ado.
   • IntelliJ IDEA will also pick it up automatically and provide IDE support for the additional methods.
   • Eclipse Groovy integration seems to have problems handling extension modules, at least for me.

Functionality

You can see exactly which utility classes participate in the Gruava extension module by inspecting its descriptor.

Be sure to check out Guava's own documentation for more information about the offered functionality, e. g. Collection Utilities Explained.