/*
* Copyright 2017-present Facebook, 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.facebook.buck.testutil;
import java.util.Optional;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;
public class OptionalMatchers {
private OptionalMatchers() {}
public static <T> TypeSafeDiagnosingMatcher<Optional<T>> empty() {
return new TypeSafeDiagnosingMatcher<Optional<T>>() {
@Override
protected boolean matchesSafely(Optional<T> optional, Description description) {
if (optional.isPresent()) {
description.appendText("optional contents was ").appendValue(optional.get());
return false;
} else {
return true;
}
}
@Override
public void describeTo(Description description) {
description.appendText("optional should be empty");
}
};
}
public static <T> TypeSafeDiagnosingMatcher<Optional<T>> present(Matcher<T> matcher) {
return new TypeSafeDiagnosingMatcher<Optional<T>>() {
@Override
protected boolean matchesSafely(Optional<T> optional, Description description) {
if (optional.isPresent()) {
if (matcher.matches(optional.get())) {
return true;
} else {
description.appendText("optional contents ");
matcher.describeMismatch(optional.get(), description);
return false;
}
} else {
description.appendText("optional was empty");
return false;
}
}
@Override
public void describeTo(Description description) {
description.appendText("optional should contain ").appendDescriptionOf(matcher);
}
};
}
}