77 lines
2.6 KiB
Markdown
77 lines
2.6 KiB
Markdown
Mon
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===
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TypeAlias for Java
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[]()
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[](https://www.codacy.com/app/kemitix/mon?utm_source=github.com&utm_medium=referral&utm_content=kemitix/mon&utm_campaign=Badge_Grade)
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[](https://travis-ci.org/kemitix/mon)
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[](https://coveralls.io/github/kemitix/mon?branch=master)
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[](https://codecov.io/gh/kemitix/mon)
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## Maven
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```xml
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<dependency>
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<groupId>net.kemitix</groupId>
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<artifactId>mon</artifactId>
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<version>0.4.0</version>
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</dependency>
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```
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## Usage
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### TypeAlias
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```java
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class Goal extends TypeAlias<String> {
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private Goal(final String goal) {
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super(goal);
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}
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public static Goal of(final String goal) {
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return new Goal(goal);
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}
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}
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```
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```java
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Goal goal = Goal.of("goal");
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void foo(final Goal goal) {
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System.out.println("The goal is " + goal.getValue());
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}
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```
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### Maybe (Just & Nothing)
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```java
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assertThat(Maybe.maybe(null)).isEqualTo(Maybe.nothing());
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assertThat(Maybe.maybe(1)).isEqualTo(Maybe.just(1));
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assertThat(Maybe.nothing()
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.orElseGet(() -> 1)).isEqualTo(1);
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assertThat(Maybe.just(1)
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.orElseGet(() -> 2)).isEqualTo(1);
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assertThat(Maybe.nothing()
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.orElse(1)).isEqualTo(1);
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assertThat(Maybe.just(1)
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.orElse(2)).isEqualTo(1);
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assertThat(Maybe.just(1)
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.filter(v -> v > 2)).isEqualTo(Maybe.nothing());
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assertThat(Maybe.just(3)
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.filter(v -> v > 2)).isEqualTo(Maybe.just(3));
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assertThat(Maybe.just(1)
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.toOptional()).isEqualTo(Optional.of(1));
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assertThat(Maybe.nothing()
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.toOptional()).isEqualTo(Optional.empty());
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assertThat(Maybe.fromOptional(Optional.of(1))).isEqualTo(Maybe.just(1));
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assertThat(Maybe.fromOptional(Optional.empty())).isEqualTo(Maybe.nothing());
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final AtomicInteger reference = new AtomicInteger(0);
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assertThat(Maybe.just(1).peek(reference::set)).isEqualTo(Maybe.just(1));
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assertThat(reference).hasValue(1);
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assertThat(Maybe.nothing().peek(v -> reference.incrementAndGet())).isEqualTo(Maybe.nothing());
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assertThat(reference).hasValue(1);
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assertThatCode(() -> Maybe.just(1).orElseThrow(IllegalStateException::new))
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.doesNotThrowAnyException();
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assertThatThrownBy(() -> Maybe.nothing().orElseThrow(IllegalStateException::new))
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.isInstanceOf(IllegalStateException.class);
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```
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