Value: add where() with Supplier<T> parameters
* Add `<T> Value.where(boolean, Supplier<T>, Supplier<T>)` * Add `Optional<T> Value.where(boolean, Supplier<T>)`
This commit is contained in:
parent
03eb1398bd
commit
a1d9f17faf
4 changed files with 65 additions and 2 deletions
|
@ -4,6 +4,8 @@ CHANGELOG
|
|||
0.3.0
|
||||
-----
|
||||
|
||||
* Add `<T> Value.where(boolean, Supplier<T>, Supplier<T>)`
|
||||
* Add `Optional<T> Value.where(boolean, Supplier<T>)`
|
||||
* Add `.travis-support`
|
||||
* Avoid danger of JVM-level deadlock during `Value` initialisation
|
||||
* Avoid danger of JVM-level deadlock during `Condition` initialisation
|
||||
|
|
10
README.adoc
10
README.adoc
|
@ -201,6 +201,16 @@ if (isTrue()) {
|
|||
String result = isTrue() ? TRUE : FALSE;
|
||||
----
|
||||
|
||||
[[source,java]]
|
||||
----
|
||||
final String result = Value.where(isTrue(), () -> TRUE, () -> FALSE);
|
||||
----
|
||||
|
||||
[[source,java]]
|
||||
----
|
||||
final Optional<String> result = Value.where(isTrue(), () -> TRUE);
|
||||
----
|
||||
|
||||
[[source,java]]
|
||||
----
|
||||
final String result = Value.<String>where(isTrue()).then(() -> TRUE)
|
||||
|
|
|
@ -21,6 +21,7 @@
|
|||
|
||||
package net.kemitix.conditional;
|
||||
|
||||
import java.util.Optional;
|
||||
import java.util.function.Supplier;
|
||||
|
||||
/**
|
||||
|
@ -55,6 +56,22 @@ public interface Value {
|
|||
return where(!clause);
|
||||
}
|
||||
|
||||
static <T> T where(
|
||||
boolean clause,
|
||||
Supplier<T> trueSupplier,
|
||||
Supplier<T> falseSupplier
|
||||
) {
|
||||
return Value.<T>where(clause).then(trueSupplier)
|
||||
.otherwise(falseSupplier);
|
||||
}
|
||||
|
||||
static <T> Optional<T> where(
|
||||
boolean clause,
|
||||
Supplier<T> trueSupplier
|
||||
) {
|
||||
return Optional.ofNullable(Value.where(clause, trueSupplier, () -> null));
|
||||
}
|
||||
|
||||
/**
|
||||
* An intermediate state in determining the final {@link Value}.
|
||||
*
|
||||
|
|
|
@ -3,6 +3,8 @@ package net.kemitix.conditional;
|
|||
import lombok.val;
|
||||
import org.junit.Test;
|
||||
|
||||
import java.util.Optional;
|
||||
|
||||
import static org.assertj.core.api.Assertions.assertThat;
|
||||
|
||||
/**
|
||||
|
@ -15,7 +17,39 @@ public class ValueTest {
|
|||
private static final String FALSE = "false";
|
||||
|
||||
@Test
|
||||
public void valueWhereTrueIsTrue() {
|
||||
public void valueWhereClauseIsTrueTypeSafe() {
|
||||
//when
|
||||
final String result = Value.where(true, () -> TRUE, () -> FALSE);
|
||||
//then
|
||||
assertThat(result).isEqualTo(TRUE);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void valueWhereClauseIsFalseTypeSafe() {
|
||||
//when
|
||||
final String result = Value.where(false, () -> TRUE, () -> FALSE);
|
||||
//then
|
||||
assertThat(result).isEqualTo(FALSE);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void valueWhereClauseIsTrueIsOptional() {
|
||||
//when
|
||||
final Optional<String> result = Value.where(true, () -> TRUE);
|
||||
//then
|
||||
assertThat(result).contains(TRUE);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void valueWhereClauseIsFalseIsEmptyOptional() {
|
||||
//when
|
||||
final Optional<String> result = Value.where(false, () -> TRUE);
|
||||
//then
|
||||
assertThat(result).isEmpty();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void valueWhereClauseIsTrue() {
|
||||
//when
|
||||
val result = Value.<String>where(true).then(() -> TRUE)
|
||||
.otherwise(() -> FALSE);
|
||||
|
@ -24,7 +58,7 @@ public class ValueTest {
|
|||
}
|
||||
|
||||
@Test
|
||||
public void valueWhereFalseIsFalse() {
|
||||
public void valueWhereClauseIsFalse() {
|
||||
//when
|
||||
val result = Value.<String>where(false).then(() -> TRUE)
|
||||
.otherwise(() -> FALSE);
|
||||
|
|
Loading…
Reference in a new issue