streamsupport | Backport of Java 8/9 javautilstream API to Java 6/7 and Android | Runtime Evironment library
kandi X-RAY | streamsupport Summary
kandi X-RAY | streamsupport Summary
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-1.7.4. Want also lambdas?
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Top functions reviewed by kandi - BETA
- Generates a random number of random bytes .
- DeepEquals between two objects .
- Make a reference stream from an upstream pipeline .
- Tries to merge all runs in a single run .
- Merge two runs .
- Accumulate long using the provided function .
- Make a drop while keeping reference to true .
- Takes a ternary collector for a downstream collector .
- Adapts an spliterator to a PrimitiveIterator .
- Submits an item to the queue .
streamsupport Key Features
streamsupport Examples and Code Snippets
Community Discussions
Trending Discussions on streamsupport
QUESTION
IntStream.range(x,y) would return a stream from x(inclusive) and y(exclusive).
IntStream.rangeClosed(x,y) would return a stream from x(inclusive) and y(inclusive).
I expected rangeClosed(x,y) to invoke range(x,y-1) or range(x,y) to invoke rangeClosed(x,y-1). But while looking at the source code for range it was like:
ANSWER
Answered 2021-May-03 at 11:54Even though there aren't any differences in the normal scenario, it would cause an issue when the input to the methods are min/max limits of Integer.
Assuming that rangeClosed(x,y) invokes range(x,y+1). If you are invoking rangeClosed(0, Integer.MAX_VALUE), then instead of the expected number of iterations (2147483648), the actual number of iterations would be 0, as Integer.MAX_VALUE + 1 would result in an overflow and an empty stream would be returned.
Similar overflow would cause the result to be different in case if an input is Integer.MIN_VALUE.
QUESTION
While looking at the source code, I could see that the stream() method has been overridden in Collections.UnmodifiableMap.UnmodifiableEntrySet. But the code seems to be identical to Collection.stream() except the return type in Collections.UnmodifiableMap.UnmodifiableEntrySet.stream() is more specific to be Stream> rather than just Stream as in Collection.stream().
The spliterator() method is different in both classes, but even if stream is not overriden I think that the UnmodifiableEntrySet.spliterator() would be invoked from Collection.stream() if the object is of type UnmodifiableEntrySet.
So, is there any reason why the stream method was overriden?
Collection.java
...ANSWER
Answered 2021-May-30 at 07:49After copying the contents of Collections.java to a new class CollectionsCopy.java, I tried removing the stream method from UnmodifiableEntrySet then I did some debugging and was able to get to an answer.
UnmodifiableEntrySet extends UnmodifiableSet which extends UnmodifiableCollection which in turn implements Collection. Since UnmodifiableCollection has a field final Collection c;, it had to override the stream() as below
QUESTION
I'm working with a multi-module Gradle Spring Boot application that has a shared "library" module with common functionality shared among the other modules. One of the classes in the module is doing some custom logic if a value passed in is an instance of a given class from another library.
...ANSWER
Answered 2021-Apr-02 at 15:32One approach would be to reflectively load the Class object and using that for the instance check, returning false if the class is not on the classpath:
QUESTION
I found some surprising behavior with Java parallel streams. I made my own Spliterator, and the resulting parallel stream gets divided up until each stream has only one element in it. That seems way too small and I wonder what I'm doing wrong. I'm hoping there's some characteristics I can set to correct this.
Here's my test code. The Float here is just a dummy payload, my real stream class is somewhat more complicated.
ANSWER
Answered 2021-Mar-19 at 14:28Unless I am missing the obvious, you could always pass a bufferSize in the constructor and use that for your trySplit:
QUESTION
I've noticed that the spliterator produced by using Guava's Iterables.partition(collection, partitionSize).spliterator() behaves strange.
Executing trySplit() on the resultant spliterator doesn't split, but executing trySplit() on the result of the initial trySplit() finally does.
Furthermore, using StreamSupport.stream(Iterables.partition(collection, partitionSize).spliterator(), true) does not parallelize the the stream, but
StreamSupport.stream(Iterables.partition(collection, partitionSize).spliterator().trySplit(), true) does parallelize and the resultant stream contains all of the partitions.
My goal is: given a collection with size 100k I want to partition it into batches of size 5000 and process those batches in parallel.
2 questions: does the spliterator generated by Iterables.partition behave correctly? Is my approach a good way to achieve my goal?
...ANSWER
Answered 2021-Mar-18 at 19:00The problem here is that Spliterator comes from an Iterable, that does not have a known size. So the implementation internally will buffer the elements into a buffer of size 1024 and continue to increase the buffer on next iterations. What I mean by that is :
QUESTION
The code below is doing a left join. the output result is
...ANSWER
Answered 2021-Mar-09 at 16:13 IntStream.range(0, s1.size())
.mapToObj(x -> {
int left = s1.get(x);
int right = s2.get(x);
return new AbstractMap.SimpleEntry<>(left, left == right ? right : null);
})
.forEach(System.out::println);
QUESTION
I have a question and hope someone would help me improve my knowledge of Java Stream API.
My service receives data from another service via RabbitMQ as array like this:
...ANSWER
Answered 2021-Jan-22 at 12:36You can make below code as sample.
QUESTION
I'm stuck on the task. I need to send Map from Spring Boot backend to Angular application.
Controller
...ANSWER
Answered 2021-Jan-13 at 14:11Your service in Angular could be:
QUESTION
I have rephrased the question and will explain it in more detail. I'm sorry and thank you. This is how the system is in spring boot java. The java I'm using is the 11. As for the system, it goes up. It communicates with the database. However, I can't make the system work. It gives me the answer from the undefined method and I don't understand what I'm getting wrong. Here you have many answers about the undefined method, but none that I have looked for is similar to my error.
My resource:
...ANSWER
Answered 2020-Dec-01 at 22:19I uninstalled Lombok and reinstalled. Then I switched to the version you are using in the POM and also added as annotations Getter and Setter in the classes in question and it worked!
QUESTION
I've searched for a lot of time and I cannot find a way to solve this problem. In my spring application I have a BesoinPoseMapper
ANSWER
Answered 2020-Nov-26 at 08:44You need to create an instance of BesoinPoseMapper in another word an entry point to the instance once the implementation of your mapper is generated like this:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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No vulnerabilities reported
Install streamsupport
You can use streamsupport like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the streamsupport component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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