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/*
* Copyright (c) 2016 Google, Inc.
*
* 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.common.truth;
import static com.google.common.truth.Fact.fact;
import static com.google.common.truth.Fact.simpleFact;
import java.util.Optional;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Propositions for Java 8 {@link Optional} subjects.
*
* @author Christian Gruber
*/
public final class OptionalSubject extends Subject {
private final Optional<?> actual;
OptionalSubject(
FailureMetadata failureMetadata,
@Nullable Optional<?> subject,
@Nullable String typeDescription) {
super(failureMetadata, subject, typeDescription);
this.actual = subject;
}
// TODO(cpovirk): Consider making OptionalIntSubject and OptionalLongSubject delegate to this.
/** Fails if the {@link Optional}{@code <T>} is empty or the subject is null. */
public void isPresent() {
if (actual == null) {
failWithActual(simpleFact("expected present optional"));
} else if (!actual.isPresent()) {
failWithoutActual(simpleFact("expected to be present"));
}
}
/** Fails if the {@link Optional}{@code <T>} is present or the subject is null. */
public void isEmpty() {
if (actual == null) {
failWithActual(simpleFact("expected empty optional"));
} else if (actual.isPresent()) {
failWithoutActual(
simpleFact("expected to be empty"), fact("but was present with value", actual.get()));
}
}
/**
* Fails if the {@link Optional}{@code <T>} does not have the given value or the subject is null.
*
* <p>To make more complex assertions on the optional's value split your assertion in two:
*
* <pre>{@code
* assertThat(myOptional).isPresent();
* assertThat(myOptional.get()).contains("foo");
* }</pre>
*/
public void hasValue(Object expected) {
if (expected == null) {
throw new NullPointerException("Optional cannot have a null value.");
}
if (actual == null) {
failWithActual("expected an optional with value", expected);
} else if (!actual.isPresent()) {
failWithoutActual(fact("expected to have value", expected), simpleFact("but was empty"));
} else {
checkNoNeedToDisplayBothValues("get()").that(actual.get()).isEqualTo(expected);
}
}
public static Subject.Factory<OptionalSubject, Optional<?>> optionals() {
return (metadata, subject) -> new OptionalSubject(metadata, subject, "optional");
}
}
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