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// Copyright (C) 2017 The Android Open Source Project
//
// 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 com.google.gerrit.truth;
import static com.google.common.truth.Fact.fact;
import static com.google.common.truth.Truth.assertAbout;
import com.google.common.truth.CustomSubjectBuilder;
import com.google.common.truth.FailureMetadata;
import com.google.common.truth.StandardSubjectBuilder;
import com.google.common.truth.Subject;
import java.util.Optional;
import java.util.function.BiFunction;
public class OptionalSubject<S extends Subject, T> extends Subject {
private final Optional<T> optional;
private final BiFunction<StandardSubjectBuilder, ? super T, ? extends S> valueSubjectCreator;
public static <S extends Subject, T> OptionalSubject<S, T> assertThat(
Optional<T> optional, Subject.Factory<? extends S, ? super T> valueSubjectFactory) {
return assertAbout(optionals()).thatCustom(optional, valueSubjectFactory);
}
public static OptionalSubject<Subject, ?> assertThat(Optional<?> optional) {
return assertAbout(optionals()).that(optional);
}
public static CustomSubjectBuilder.Factory<OptionalSubjectBuilder> optionals() {
return OptionalSubjectBuilder::new;
}
private OptionalSubject(
FailureMetadata failureMetadata,
Optional<T> optional,
BiFunction<StandardSubjectBuilder, ? super T, ? extends S> valueSubjectCreator) {
super(failureMetadata, optional);
this.optional = optional;
this.valueSubjectCreator = valueSubjectCreator;
}
public void isPresent() {
isNotNull();
if (!optional.isPresent()) {
failWithoutActual(fact("expected to have", "value"));
}
}
public void isAbsent() {
isNotNull();
if (optional.isPresent()) {
failWithoutActual(fact("expected not to have", "value"));
}
}
public void isEmpty() {
isAbsent();
}
public S value() {
isNotNull();
isPresent();
return valueSubjectCreator.apply(check("value()"), optional.get());
}
public static class OptionalSubjectBuilder extends CustomSubjectBuilder {
OptionalSubjectBuilder(FailureMetadata failureMetadata) {
super(failureMetadata);
}
public <S extends Subject, T> OptionalSubject<S, T> thatCustom(
Optional<T> optional, Subject.Factory<? extends S, ? super T> valueSubjectFactory) {
return that(optional, (builder, value) -> builder.about(valueSubjectFactory).that(value));
}
public OptionalSubject<Subject, ?> that(Optional<?> optional) {
return that(optional, StandardSubjectBuilder::that);
}
public <S extends Subject, T> OptionalSubject<S, T> that(
Optional<T> optional,
BiFunction<StandardSubjectBuilder, ? super T, ? extends S> valueSubjectCreator) {
return new OptionalSubject<>(metadata(), optional, valueSubjectCreator);
}
}
}