support-optional provides a Java 9 optional that supports Java 6, Android and RetroLambda development while having an easy migration to the real optional class. This library is much in the spirit of ActionBarSherlock that it was only designed to be a removed.
It has been deprecated from inception with the intention that you could some day throw it away.
--Jake Wharton
Other backports have various problems like different class names, slightly different behavior or interface default methods. These make it harder to use and migrate to the real Java 9 optional class. So here is yet another optional backport, so you don't have to waste your time writing one.
Make sure you have the jcenter repository in your root build.gradle
repositories {
jcenter()
}Then add the following to your modules build.gradle file
dependencies {
compile 'com.github.dmstocking:support-optional:1.2'
}Perform the following replacement regex
s/com\.github\.dmstocking\.optional\.//g
This could be done with find and sed in your project folder via
find . -name "*.java" -exec sed -i 's/com\.github\.dmstocking\.optional\.//g' {} \;or with an IDE so a search and replace without regex of
com.github.dmstocking.optional. with nothing over your entire src directory.
- Optional<T>::stream()
- OptionalInt::stream()
- OptionalLong::stream()
- OptionalDouble::stream()
Because this library does not backport streams, there is no stream method on any of the Optional classes.
Copyright 2017 David Stocking
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.