org.dmfs.jems.hamcrest.matchers.optional.AbsentMatcher Maven / Gradle / Ivy
/*
* Copyright 2018 dmfs GmbH
*
*
* 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 org.dmfs.jems.hamcrest.matchers.optional;
import org.dmfs.jems.optional.Optional;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;
import java.util.NoSuchElementException;
/**
* {@link Matcher} of {@link Optional} that matches when the tested value is absent.
*
* @author Marten Gajda
*/
public final class AbsentMatcher extends TypeSafeDiagnosingMatcher>
{
/**
* Creates a matcher that matches when the tested value is absent.
*/
public static AbsentMatcher absent()
{
return new AbsentMatcher();
}
@Override
protected boolean matchesSafely(Optional item, Description mismatchDescription)
{
if (item.isPresent())
{
mismatchDescription.appendText("present");
return false;
}
try
{
item.value();
mismatchDescription.appendText("value() did not throw NoSuchElementException");
return false;
}
catch (NoSuchElementException e)
{
return true;
}
}
@Override
public void describeTo(Description description)
{
description.appendText("absent");
}
}