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About the developer

stefan-zobel
159 Stars 19 Forks GNU General Public License v2.0 1.4K Commits 0 Opened issues

Description

Backport of Java 8/9 java.util.stream API to Java 6/7 and Android. Moved from https://sourceforge.net/projects/streamsupport/

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streamsupport

streamsupport is a backport of the Java 8

java.util.function
(functional interfaces) and
java.util.stream
(streams) API for Android and users of Java 6 or 7 supplemented with selected additions from
java.util.concurrent
which didn't exist back in Java 6.

Due to the lack of default interface methods and static interface methods in pre-Java 8 the API had to be slightly adjusted in these areas but still covers the full functionality scope of Java 8. In detail, static and default interface methods have been moved to companion classes in the same package that bear the identical name as the interface but with an "s" appended (e.g.

Comparator
->
Comparators
).

For ease of use, the default methods for most of the functional interfaces were NOT retained as abstract methods in the redefined interfaces (keeping them single method interfaces) - the missing default (and static) methods can always be found in the corresponding companion class.

The streamsupport API lives in the packages

java8.util.*
and
java8.lang
respectively. So, it's not possible to simply import the
java.util.stream
package in your code - you'd rather have to use
java8.util.stream
instead (see Readme.txt for details). While that is fine as long as you have full control over your source code there is the other common scenario of using a binary 3rd party dependency that has been compiled against the standard Java 8
java.util.stream
API. In the latter case bytecode rewriting via ProGuard might be an option. ProGuard supports most Java 8 language features and the latest release can also replace the standard Java 8 stream API by the the streamsupport backport (cf. the Proguard documentation, especially the section titled "Java 8 stream API support").

The current stable release of streamsupport is

streamsupport-1.7.2
.

Want also lambdas? https://github.com/orfjackal/retrolambda

Note that the streamsupport sourceforge site has been discontinued. New developments, if any, will take place here.

Please give feedback here if you experience any problems.

Features

  • Java 8 / Java 9 Streams library backport
  • Java 8 / Java 9 CompletableFuture backport
  • Java 8 Parallel array operations backport
  • Java 8 Functional interfaces backport
  • Further java.util.concurrent enhancements from Java 7/8 backported to Java 6
  • Includes miscellaneous Java 8 / Java 9 goodies (Optional, StringJoiner, ...)
  • Supports Android - all versions, starting from Ice Cream Sandwich

build.gradle:

dependencies {
    implementation 'net.sourceforge.streamsupport:streamsupport:1.7.2'
}

Maven:

    net.sourceforge.streamsupport
    streamsupport
    1.7.2

Example usage

import java.util.List;
import java8.util.stream.IntStreams;
import java8.util.stream.StreamSupport;
import static java8.util.stream.Collectors.toList;

List list = IntStreams.of(1, 2, 3, 4).boxed() .collect(toList());

List incremented = StreamSupport.stream(list) .map(i -> i + 1) .collect(toList());

Forks

Android developers using the Android Studio 3.x toolchain should have a look at the

streamsupport
forks:

Release Notes

Release Notes

LICENSE

GNU General Public License, version 2, with the Classpath Exception (and CC0 1.0 for JSR-166 derived code)

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