org.dmfs.jems.hamcrest.matchers.optional.PresentMatcher 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 org.hamcrest.core.IsAnything;
import org.hamcrest.core.IsEqual;
/**
* A {@link Matcher} to match the presence and value of an {@link Optional}.
*
* @author Marten Gajda
*/
public final class PresentMatcher extends TypeSafeDiagnosingMatcher>
{
private final Matcher mDelegate;
public PresentMatcher()
{
this(new IsAnything());
}
public PresentMatcher(T expected)
{
this(new IsEqual<>(expected));
}
public PresentMatcher(Matcher delegate)
{
mDelegate = delegate;
}
public static PresentMatcher present()
{
return new PresentMatcher<>();
}
public static PresentMatcher present(T expectedValue)
{
return new PresentMatcher<>(expectedValue);
}
public static PresentMatcher present(Matcher delegate)
{
return new PresentMatcher<>(delegate);
}
@Override
protected boolean matchesSafely(Optional item, Description mismatchDescription)
{
if (!item.isPresent())
{
mismatchDescription.appendText("not present");
return false;
}
if (!mDelegate.matches(item.value()))
{
mismatchDescription.appendText("present, but value ");
mDelegate.describeMismatch(item.value(), mismatchDescription);
return false;
}
return true;
}
@Override
public void describeTo(Description description)
{
description.appendText("present with value ");
mDelegate.describeTo(description);
}
}