Commit edd0d268 authored by Saif Abdul Cassim's avatar Saif Abdul Cassim

New upstream version 0.6.7

parents
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END OF TERMS AND CONDITIONS
\ No newline at end of file
# Migration between StreamEx releases
This document describes StreamEx changes which may break the backwards compatibility. For full list of changes see [CHANGES.md](CHANGES.md).
### 0.6.0
Issue#67: Now `StreamEx.withFirst()` as well as `StreamEx.withFirst(BinaryOperator)` include `(first, first)` pair. If you used these operations in StreamEx 0.5.3-0.5.5, you should update the existing code: replace `.withFirst()` with `.withFirst().skip(1)`.
### 0.5.5
Issue#41: As `StreamEx.without(T...)` was added, the existing code may become ambiguous now. If you've used `.without(null)` before, replace it with dedicated `.nonNull()` operation.
Issue#63: `DoubleStreamEx.reverseSorted()` may change the order of non-canonical `NaN` values (actually sorting them).
### 0.5.3
Issue#52: `StreamEx.append(T...)` and `prepend(T...)` are final now, so if you extend `StreamEx` class, you cannot override them anymore.
### 0.5.0
Issue#8: The package `javax.util.streamex` is renamed to `one.util.streamex`. The OSGi bundle name and Maven groupId are changed correspondingly. To migrate to StreamEx 0.5.0 you should:
* Replace every occurrence of `javax.util.streamex` to `one.util.streamex` in your Java files and OSGi manifests.
* Replace `io.github.amaembo` groupID with `one.util` in your build files (pom.xml, ivy.xml, build.gradle, etc.)
# StreamEx 0.6.7
Enhancing Java 8 Streams.
[![Maven Central](https://img.shields.io/maven-central/v/one.util/streamex.svg)](https://maven-badges.herokuapp.com/maven-central/one.util/streamex/)
[![Javadocs](https://www.javadoc.io/badge/one.util/streamex.svg)](https://www.javadoc.io/doc/one.util/streamex)
[![Build Status](https://travis-ci.org/amaembo/streamex.png?branch=master)](https://travis-ci.org/amaembo/streamex)
[![Coverage Status](https://coveralls.io/repos/amaembo/streamex/badge.svg?branch=master&service=github)](https://coveralls.io/github/amaembo/streamex?branch=master)
This library defines four classes: `StreamEx`, `IntStreamEx`, `LongStreamEx`, `DoubleStreamEx`
which are fully compatible with Java 8 stream classes and provide many additional useful methods.
Also `EntryStream` class is provided which represents the stream of map entries and provides
additional functionality for this case. Finally there are some new useful collectors defined in `MoreCollectors`
class as well as primitive collectors concept.
Full API documentation is available [here](http://amaembo.github.io/streamex/javadoc/).
Take a look at the [Cheatsheet](CHEATSHEET.md) for brief introduction to the StreamEx!
Before updating StreamEx check the [migration notes](MIGRATION.md) and full list of [changes](CHANGES.md).
StreamEx library main points are following:
* Shorter and convenient ways to do the common tasks.
* Better interoperability with older code.
* 100% compatibility with original JDK streams.
* Friendliness for parallel processing: any new feature takes the advantage on parallel streams as much as possible.
* Performance and minimal overhead. If StreamEx allows to solve the task using less code compared to standard Stream, it
should not be significantly slower than the standard way (and sometimes it's even faster).
### Examples
Collector shortcut methods (toList, toSet, groupingBy, joining, etc.)
```java
List<String> userNames = StreamEx.of(users).map(User::getName).toList();
Map<Role, List<User>> role2users = StreamEx.of(users).groupingBy(User::getRole);
StreamEx.of(1,2,3).joining("; "); // "1; 2; 3"
```
Selecting stream elements of specific type
```java
public List<Element> elementsOf(NodeList nodeList) {
return IntStreamEx.range(nodeList.getLength())
.mapToObj(nodeList::item).select(Element.class).toList();
}
```
Adding elements to stream
```java
public List<String> getDropDownOptions() {
return StreamEx.of(users).map(User::getName).prepend("(none)").toList();
}
public int[] addValue(int[] arr, int value) {
return IntStreamEx.of(arr).append(value).toArray();
}
```
Removing unwanted elements and using the stream as Iterable:
```java
public void copyNonEmptyLines(Reader reader, Writer writer) throws IOException {
for(String line : StreamEx.ofLines(reader).remove(String::isEmpty)) {
writer.write(line);
writer.write(System.lineSeparator());
}
}
```
Selecting map keys by value predicate:
```java
Map<String, Role> nameToRole;
public Set<String> getEnabledRoleNames() {
return StreamEx.ofKeys(nameToRole, Role::isEnabled).toSet();
}
```
Operating on key-value pairs:
```java
public Map<String, List<String>> invert(Map<String, List<String>> map) {
return EntryStream.of(map).flatMapValues(List::stream).invert().grouping();
}
public Map<String, String> stringMap(Map<Object, Object> map) {
return EntryStream.of(map).mapKeys(String::valueOf)
.mapValues(String::valueOf).toMap();
}
Map<String, Group> nameToGroup;
public Map<String, List<User>> getGroupMembers(Collection<String> groupNames) {
return StreamEx.of(groupNames).mapToEntry(nameToGroup::get)
.nonNullValues().mapValues(Group::getMembers).toMap();
}
```
Pairwise differences:
```java
DoubleStreamEx.of(input).pairMap((a, b) -> b-a).toArray();
```
Support of byte/char/short/float types:
```java
short[] multiply(short[] src, short multiplier) {
return IntStreamEx.of(src).map(x -> x*multiplier).toShortArray();
}
```
Define custom lazy intermediate operation recursively:
```java
static <T> StreamEx<T> scanLeft(StreamEx<T> input, BinaryOperator<T> operator) {
return input.headTail((head, tail) -> scanLeft(tail.mapFirst(cur -> operator.apply(head, cur)), operator)
.prepend(head));
}
```
And more!
### License
This project is licensed under [Apache License, version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
### Installation
Releases are available in [Maven Central](https://repo1.maven.org/maven2/one/util/streamex/)
Before updating StreamEx check the [migration notes](MIGRATION.md) and full list of [changes](CHANGES.md).
#### Maven
Add this snippet to the pom.xml `dependencies` section:
```xml
<dependency>
<groupId>one.util</groupId>
<artifactId>streamex</artifactId>
<version>0.6.7</version>
</dependency>
```
#### Gradle
Add this snippet to the build.gradle `dependencies` section:
```groovy
implementation 'one.util:streamex:0.6.7'
```
Pull requests are welcome.
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This diff is collapsed.
/*
* Copyright 2015, 2017 StreamEx contributors
*
* 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.
*/
package one.util.streamex;
import java.util.Spliterator;
import java.util.concurrent.ForkJoinPool;
import java.util.function.Function;
import java.util.stream.BaseStream;
/**
* @author Tagir Valeev
*/
/* package */abstract class BaseStreamEx<T, S extends BaseStream<T, S>, SPLTR extends Spliterator<T>, B extends BaseStreamEx<T, S, SPLTR, B>>
implements BaseStream<T, S> {
static final String CONSUMED_MESSAGE = "Stream is already consumed";
private S stream;
SPLTR spliterator;
StreamContext context;
BaseStreamEx(S stream, StreamContext context) {
this.stream = stream;
this.context = context;
}
BaseStreamEx(SPLTR spliterator, StreamContext context) {
this.spliterator = spliterator;
this.context = context;
}
abstract S createStream();
final S stream() {
if (stream != null)
return stream;
if (spliterator == null)
throw new IllegalStateException(CONSUMED_MESSAGE);
stream = createStream();
spliterator = null;
return stream;
}
@SuppressWarnings("unchecked")
@Override
public SPLTR spliterator() {
if (stream != null)
return (SPLTR) stream.spliterator();
if (spliterator != null) {
SPLTR s = spliterator;
spliterator = null;
return s;
}
throw new IllegalStateException(CONSUMED_MESSAGE);
}
@Override
public boolean isParallel() {
return context.parallel;
}
@SuppressWarnings("unchecked")
@Override
public S sequential() {
context = context.sequential();
if (stream != null)
stream = stream.sequential();
return (S) this;
}
/**
* {@inheritDoc}
*
* <p>
* If this stream was created using {@link #parallel(ForkJoinPool)}, the new
* stream forgets about supplied custom {@link ForkJoinPool} and its
* terminal operation will be executed in common pool.
*/
@SuppressWarnings("unchecked")
@Override
public S parallel() {
context = context.parallel();
if (stream != null)
stream = stream.parallel();
return (S) this;
}
/**
* Returns an equivalent stream that is parallel and bound to the supplied
* {@link ForkJoinPool}.
*
* <p>
* This is an <a href="package-summary.html#StreamOps">intermediate</a>
* operation.
*
* <p>
* The terminal operation of this stream or any derived stream (except the
* streams created via {@link #parallel()} or {@link #sequential()} methods)
* will be executed inside the supplied {@code ForkJoinPool}. If current
* thread does not belong to that pool, it will wait till calculation
* finishes.
*
* @param fjp a {@code ForkJoinPool} to submit the stream operation to.
* @return a parallel stream bound to the supplied {@code ForkJoinPool}
* @since 0.2.0
*/
@SuppressWarnings("unchecked")
public S parallel(ForkJoinPool fjp) {
context = context.parallel(fjp);
if (stream != null)
stream = stream.parallel();
return (S) this;
}
@SuppressWarnings("unchecked")
@Override
public S unordered() {
stream = stream().unordered();
return (S) this;
}
@SuppressWarnings("unchecked")
@Override
public S onClose(Runnable closeHandler) {
context = context.onClose(closeHandler);
return (S) this;
}
@Override
public void close() {
context.close();
}
/**
* Applies the supplied function to this stream and returns the result of
* the function.
*
* <p>
* This method can be used to add more functionality in the fluent style.
* For example, consider user-defined static method
* {@code batches(stream, n)} which breaks the stream into batches of given