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Extend nullable utils to native nullables

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This commit is contained in:
Andrea Cavalli 2023-11-11 22:19:04 +01:00
parent f836a26001
commit 87f31652d7
2 changed files with 77 additions and 63 deletions
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77
datagen/src/main/java/it/cavallium/datagen/NativeNullable.java
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@ -1,5 +1,11 @@
package it.cavallium.datagen;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Stream;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
@ -21,4 +27,75 @@ public interface NativeNullable<T> {
@Nullable
T getNullable(@Nullable T defaultValue);
default <U, TN> @NotNull TN map(
@NotNull Function<@NotNull T, @NotNull U> value,
@NotNull Function<@Nullable U, @NotNull TN> nullableConstructor) {
var nullable = getNullable();
if (nullable != null) {
var val = value.apply(nullable);
Objects.requireNonNull(val, "Mapped value must not be null");
return nullableConstructor.apply(val);
} else {
return nullableConstructor.apply(null);
}
}
default <U, TN extends TypedNullable<U>> @NotNull TN mapNullable(
@NotNull Function<@NotNull T, @NotNull TN> value,
@NotNull Supplier<@NotNull TN> emptyNullableConstructor) {
var nullable = getNullable();
if (nullable != null) {
var val = value.apply(nullable);
Objects.requireNonNull(val, "Mapped value must not be null");
return val;
} else {
return emptyNullableConstructor.get();
}
}
default <U> @NotNull Optional<U> map(@NotNull Function<@NotNull T, @NotNull U> value) {
var nullable = getNullable();
if (nullable != null) {
var val = value.apply(nullable);
return Optional.of(val);
} else {
return Optional.empty();
}
}
@SuppressWarnings("unchecked")
default <TN extends TypedNullable<T>> @NotNull TN filter(
@NotNull Predicate<@NotNull T> value,
@NotNull Supplier<TN> nullableConstructor) {
var nullable = getNullable();
if (nullable != null) {
var filter = value.test(nullable);
if (!filter) {
return nullableConstructor.get();
}
}
return (TN) this;
}
default @NotNull Optional<T> filter(@NotNull Predicate<@NotNull T> value) {
var nullable = getNullable();
if (nullable != null) {
var filter = value.test(nullable);
if (!filter) {
return Optional.empty();
}
}
return Optional.ofNullable(nullable);
}
default @NotNull Optional<T> toOptional() {
var nullable = getNullable();
return Optional.ofNullable(nullable);
}
default @NotNull Stream<T> stream() {
var nullable = getNullable();
return Stream.ofNullable(nullable);
}
}

63
datagen/src/main/java/it/cavallium/datagen/TypedNullable.java
View File

@ -1,11 +1,6 @@
package it.cavallium.datagen;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Stream;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
@ -57,62 +52,4 @@ public interface TypedNullable<T> extends NativeNullable<T> {
default boolean isEmpty() {
return getNullable() == null;
}
default <U, TN extends TypedNullable<U>> @NotNull TN map(
@NotNull Function<@NotNull T, @NotNull U> value,
@NotNull Function<@Nullable U, @NotNull TN> nullableConstructor) {
var nullable = getNullable();
if (nullable != null) {
var val = value.apply(nullable);
Objects.requireNonNull(val, "Mapped value must not be null");
return nullableConstructor.apply(val);
} else {
return nullableConstructor.apply(null);
}
}
default <U> @NotNull Optional<U> map(@NotNull Function<@NotNull T, @NotNull U> value) {
var nullable = getNullable();
if (nullable != null) {
var val = value.apply(nullable);
return Optional.of(val);
} else {
return Optional.empty();
}
}
@SuppressWarnings("unchecked")
default <TN extends TypedNullable<T>> @NotNull TN filter(
@NotNull Predicate<@NotNull T> value,
@NotNull Supplier<TN> nullableConstructor) {
var nullable = getNullable();
if (nullable != null) {
var filter = value.test(nullable);
if (!filter) {
return nullableConstructor.get();
}
}
return (TN) this;
}
default @NotNull Optional<T> filter(@NotNull Predicate<@NotNull T> value) {
var nullable = getNullable();
if (nullable != null) {
var filter = value.test(nullable);
if (!filter) {
return Optional.empty();
}
}
return Optional.ofNullable(nullable);
}
default @NotNull Optional<T> toOptional() {
var nullable = getNullable();
return Optional.ofNullable(nullable);
}
default @NotNull Stream<T> stream() {
var nullable = getNullable();
return Stream.ofNullable(nullable);
}
}